Journal articles: 'Waveguide antenna'

1

Koshkid’ko, V. G., and M. M. Migalin. "Design of a Slotted Waveguide Antenna by Means of VBScript Scripting Language Macros in CAD Ansys HFSS." Journal of the Russian Universities. Radioelectronics 23, no. 1 (February 28, 2020): 6–17. http://dx.doi.org/10.32603/1993-8985-2020-23-1-6-17.

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Introduction. Modern antenna devices contain a large number of repeating elements. The process of development of CAD models of such devices requires repeatedly performed operations that is a routine task for an engineer. Therefore, the problem of repeating operations automation arises when constructing antenna models with periodic structures.Aim. To demonstrate the automation of slotted waveguide antennas design process in CAD Ansys HFSS.Materials and methods. In order to determine the dimensions of the slotted waveguide antenna the energy method was used. Automation procedure of the design of the slotted waveguide antennas in CAD Ansys HFSS using the Visual Basic Scripting Edition macros was presented.Results. In order to design and edit slotted waveguide antennas in CAD Ansys HFSS four macros in the VBScript language were established: for slot subtraction from a broad wall of a rectangular waveguide at given coordinates; for removing the original slots created using the previous macro; for drawing a polyline passing through the centers of the slots, in order to verify the antenna’s near field realized distribution; for inclined slot subtraction from a narrow wall of a rectangular waveguide at given coordinates. Results of the macros usage were presented.Conclusion. The above mentioned macros allow one to automate the routine steps during the process of creating and deleting objects while designing an antenna model with periodic structures in CAD Ansys HFSS. Specified procedures for creating macros could be extended to a wide class of tasks related to the studies of characteristics of electromagnetic structures including repeating objects (phased antenna arrays, reflective arrays, slotted waveguide antennas, fractal antennas, log-periodic antennas, multi-layer lens antennas, ladder-type microwave filters).

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Peyskens, Frédéric, Pieter Wuytens, Ali Raza, Pol Van Dorpe, and Roel Baets. "Waveguide excitation and collection of surface-enhanced Raman scattering from a single plasmonic antenna." Nanophotonics 7, no. 7 (May 29, 2018): 1299–306. http://dx.doi.org/10.1515/nanoph-2018-0003.

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AbstractThe integration of plasmonic antennas on single-mode silicon nitride waveguides offers great perspective for integrated surface-enhanced Raman spectroscopy (SERS). However, the few reported experimental demonstrations still require multiple plasmonic antennas to obtain a detectable SERS spectrum. Here, we show, for the first time, SERS signal detection by a single nanoplasmonic antenna integrated on a single-mode SiN waveguide. For this purpose, we investigated a backscattering detection scheme in combination with background noise reduction, which allowed an optimization of the signal-to-noise ratio (SNR) of this platform. Furthermore, a comparison with the free-space SERS spectrum of the same antenna shows that the conversion efficiency from pump power to total radiated Stokes power is twice as efficient in the case of waveguide excitation. As such, we explored several important aspects in the optimization of on-chip SERS sensors and experimentally demonstrated the power of exciting nanoplasmonic antennas using the evanescent field of a waveguide. This observation not only is useful for Raman sensing but also could be beneficial for any process involving plasmonic enhancement.

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N, Likith, Gayathri K M, Thusshara S, Maria Sanjeetha, and Thangadurai N. "Design & Analysis of S-Band Right Hand Circularly Polarized Conical Horn Antenna for NavIC Receiver." International Journal of Engineering & Technology 7, no. 3.12 (July 20, 2018): 512. http://dx.doi.org/10.14419/ijet.v7i3.12.16169.

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In satellite communication systems the horn antennas are being used widely due to its robustness and capable to operate at frequencies which are very high. Here, the right hand circular polarized conical horn antenna is designed for S-band NavIC receiver. The waveguides and conical horn antenna dimensions are designed by using standard formulas and after that they are given to a simulation tool for the S band frequency. The performance parameters like return loss, radiation pattern, gain and directivity are considered for further analysis. In the circular waveguide from the TE11 mode conical horn antenna is to be designed into high gain and a good VSWR.

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Хахинов, Виталий, and Vitaliy Khakhinov. "Receiving antenna electrodynamic model in terms of waveguide representation of HF field." Solar-Terrestrial Physics 4, no. 3 (September 28, 2018): 92–95. http://dx.doi.org/10.12737/stp-43201812.

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The receiving antenna is an important part of a radio channel that requires electrodynamic approach in mathematical simulation of its characteristics. Since the invention of radio, and due to further theoretical studies of radio signal transmission, the following situation has arisen: researchers’ attention to receiving antennas is inversely proportional to the factor by which their number exceeds the number of transmitting antennas. We address the problem of building a receiving antenna electrodynamic model in terms of a waveguide representation of HF field. Structurally, the antenna is considered as metal wires of a finite length and arbitrary configuration. Current distribution in antenna is calculated using the long-line theory and normal-mode approach. The mathematical representation of the receiving antenna electrodynamic model is calculation expressions for receiving coefficients of normal modes. They reflect the effects of receiving antenna characteristics, including its directional pattern, on effectiveness of the incident HF field energy conversion into the energy of the driven current waves and final distribution of net current in antenna. These expressions are used to derive the expression to calculate the effective length of the receiving antenna. The obtained mathematical expressions of the receiving antenna electrodynamic model do not contradict the principle of antenna reciprocity. We present calculation formulas for the receiving coefficients and excitation of the isotropic antenna electromagnetic model.

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Abdullah, M. A., M. K. A Rahim, N. A. Samsuri, and K. Kamardin. "On-Body Transmission Single-Band Diamond Dipole Antenna with Waveguide Jacket." Indonesian Journal of Electrical Engineering and Computer Science 10, no. 3 (June 1, 2018): 1212. http://dx.doi.org/10.11591/ijeecs.v10.i3.pp1212-1220.

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This paper presents the investigation of on-body transmission single-band diamond dipole antenna with three different jackets. The jackets are named as normal jacket, grounding jacket and waveguide jacket. The on-body transmission is measured using two flexible single-band antennas attach to the jackets. A man with the height of 180 cm and 75 kg weight becomes as a model for the real measurement. The measurement is conducted in small space area by using portable network analyzer with flexible network cable. The measurement results show that the best performance for on-body transmission is with waveguide jacket. 10 dB transmission improvement is archived when the antenna is placed above the waveguide jacket compared to the normal jacket. It is found that the transmission of the antenna is also depends on the antenna orientation and further transmission lossess occur when the antennas are placed above the grounding jacket.

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Frank, Martin, Fabian Lurz, Robert Weigel, and Alexander Koelpin. "Compact low-cost substrate integrated waveguide fed antenna for 122 GHz radar applications." International Journal of Microwave and Wireless Technologies 11, no. 4 (February 20, 2019): 408–12. http://dx.doi.org/10.1017/s1759078719000072.

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AbstractThis paper describes the design and characterization of a compact substrate integrated waveguide (SIW) fed antenna for the 122 GHz industrial, scientific, and medical band. The use of a single RO4350B substrate layer and the SIW feeding ensure a low-cost fabrication. Two versions of the antenna are presented differing in antenna gain and size. For measurement purpose, a transition from rectangular waveguide to SIW is introduced. Measurements of the radiation pattern have been performed and show good agreement with the numerical results for both antennas and an antenna gain up to 7.14 dBi.

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Jafargholi, Amir, Manouchehr Kamyab, and Mehdi Veysi. "PMC-Based Waveguide-Fed Slot Array." ISRN Communications and Networking 2011 (September 21, 2011): 1–5. http://dx.doi.org/10.5402/2011/941070.

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Perfect magnetic conductors (PMCs) can help in the enhancement of antenna impedance bandwidth using their capability of reflecting the incident waves without phase reversal. The purpose of this paper is to show the advantages of using a perfect magnetic conductor in antenna engineering. The goal is to use it in waveguide-fed slot array antennas, increasing both the antenna impedance and radiation bandwidths. To this aim, a PMC-based rectangular waveguide composed of longitudinal slots is convenient. The impedance of the proposed array structure is calculated analytically. To compare analytical results with the simulation results, PEC- and PMC-based waveguide-fed slot arrays are designed and simulated in a certain frequency band. The simulation results are in good agreement with the theoretical predictions.

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Morozov, V. M., and V. I. Magro. "Investigation of waveguide antenna arrays with layered dielectrics." Journal of Physics and Electronics 27, no. 2 (December 27, 2019): 111–16. http://dx.doi.org/10.15421/331935.

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A general methodology for calculating antenna arrays with layered dielectric is considered. To demonstrate the proposed methodology, we consider the solution of the problem of radiation of linear waveguide array. Plane-parallel waveguides have a finite wall thickness. Antenna array scans in E and H planes. This problem is solved using Fredholm integral equations of the second kind. To solve the problem, the entire domain of the electromagnetic field is divided into partial intersecting regions An example of constructing Green’s functions of selected partial regions with allowance for their dielectric filling is considered. The formulation of the boundary-value problem for the antenna array in the form of Fredholm integral equations of the second kind using the technique of dividing the determination domain into partial regions with Green’s functions allows us to solve the following problem: calculations of the antenna array with dielectric plugs in the waveguides and with a dielectric coating over the antenna array. This technique allows optimization of dielectric parameters with the aim of aperture matching of the antenna array. The calculation results of the dependence of the reflection coefficient on the phase shift between waveguides in the H-plane are presented. The calculations are performed for different values of the dielectric constant of the plugs in the waveguides and the dielectric constant of the dielectric layer above the antenna array. The influence of the geometric dimensions of the plugs in the waveguides and the dielectric coating above the array is studied.

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9

Mahmood, Sarmad Nozad, Asnor Juraiza Ishak, Tale Saeidi, Azura Che Soh, Ali Jalal, Muhammad Ali Imran, and Qammer H. Abbasi. "Full Ground Ultra-Wideband Wearable Textile Antenna for Breast Cancer and Wireless Body Area Network Applications." Micromachines 12, no. 3 (March 19, 2021): 322. http://dx.doi.org/10.3390/mi12030322.

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Wireless body area network (WBAN) applications have broad utility in monitoring patient health and transmitting the data wirelessly. WBAN can greatly benefit from wearable antennas. Wearable antennas provide comfort and continuity of the monitoring of the patient. Therefore, they must be comfortable, flexible, and operate without excessive degradation near the body. Most wearable antennas use a truncated ground, which increases specific absorption rate (SAR) undesirably. A full ground ultra-wideband (UWB) antenna is proposed and utilized here to attain a broad bandwidth while keeping SAR in the acceptable range based on both 1 g and 10 g standards. It is designed on a denim substrate with a dielectric constant of 1.4 and thickness of 0.7 mm alongside the ShieldIt conductive textile. The antenna is fed using a ground coplanar waveguide (GCPW) through a substrate-integrated waveguide (SIW) transition. This transition creates a perfect match while reducing SAR. In addition, the proposed antenna has a bandwidth (BW) of 7–28 GHz, maximum directive gain of 10.5 dBi and maximum radiation efficiency of 96%, with small dimensions of 60 × 50 × 0.7 mm3. The good antenna’s performance while it is placed on the breast shows that it is a good candidate for both breast cancer imaging and WBAN.

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P. Cowsigan, S., and D. Saraswady. "Structuring, Design and Analysis of a Pentab and SIW Cavity Backed Antenna for Iot Applications." International Journal of Engineering & Technology 7, no. 3.27 (August 15, 2018): 345. http://dx.doi.org/10.14419/ijet.v7i3.27.17969.

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Substrate Integrated Waveguide (SIW) cavity backed antenna technology is a new form of transmission line facilitating the realization of non-planar (waveguide based) circuits into planar form for easy integration with other planar (Microstrip) circuits and systems. They retain the low copper and dielectric loss property of traditional metallic waveguides and are widely used in integration of walls, floors and flame redundant wearable. SIW-CB antenna is a perfect candidate for IoT based wearable antenna with FR4 substrate. In this sense we structurizean efficient small size antenna for IoT applications to operate in the range of 5 – 15 GHz. FR4-epoxy substrate is chosen so that the losses are minimized hence improving the efficiency. The proposed antenna resonates at 5.4, 6.9,9.1,11.5 & 14.2 GHz hence forming the Pentaband with a maximum return loss of 38.6 db. The other antenna parameter values are Gain 28.5 db, efficiency 90% and VSWR 1.

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Barba Molina, Hernan, and Jan Hesselbarth. "Microwave dielectric stepped-index flat lens antenna." International Journal of Microwave and Wireless Technologies 9, no. 5 (October 19, 2016): 1103–9. http://dx.doi.org/10.1017/s1759078716001124.

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Dielectric stepped-index flat lens antennas for operation at 12 GHz are presented. A brick-shaped dielectric with a permittivity profile optimized for focusing is sandwiched between the metallic plates of an open-ended parallel-plate waveguide. A tapered slot antenna is placed at the focal point of the dielectric lens, thereby creating antennas with high directivity of 16.8 and 15.8 dBi, respectively. In the two versions of the antenna, the parallel-plate waveguide operates in TEM-mode and in the first higher-order TE-mode, respectively. The dielectric profile is realized by appropriate mixtures of alumina ceramic powder and microscopic hollow glass spheres, realizing permittivity ranging from εrel= 1.31 to εrel= 3.24. The design of the complete antennas is based on geometrical optics followed by optimizations with a full-wave electromagnetic solver. Measurements show good agreement with simulations.

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Morozov, V. M., V. I. Magro, and E. Yu Trakhtman. "Infinite linear waveguide antenna array with metal-dielectric structures in the "floquet channel"." Journal of Physics and Electronics 28, no. 1 (September 10, 2020): 91–96. http://dx.doi.org/10.15421/332015.

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An electrodynamics calculation is performed for an infinite waveguide antenna array in the form of open ends of waveguides, in the near zone of which a metal-dielectric structure is located. This metal-dielectric structure is located in the "Floquet channels" and is a combination of a dielectric coating over the antenna array and horns. In this case, the horns are not a continuation of the waveguides, but are located at some distance from them. The space between the waveguides and the horns is filled with a dielectric. A system of equations that allows calculating the reflection coefficients of incident waves in waveguides is obtained.

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Prakash, Ved, Sunita Kumawat, and Priti Singh. "Design and Analysis of Full and Half Mode Substrate Integrated Waveguide Planar Leaky Wave Antenna with Continuous Beam Scanning in X-Ku Band." Frequenz 73, no. 5-6 (May 27, 2019): 171–78. http://dx.doi.org/10.1515/freq-2018-0212.

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AbstractIn this paper, substrate-integrated waveguide (SIW) and half mode substrate integrated waveguide (HM-SIW) periodic leaky wave antennas (LWAs) are presented for the antenna applications. The continuous beam scanning (CBS) is realized by optimizing the unit cell by matching its impedance to the characteristic impedance of the waveguide. This leaky wave antenna is capable of total 60 ° scanning from −38 ° to + 22 ° as the frequency changes from 10.17 GHz to 16.3 GHz with a maximum gain of 11 dBi. Moreover, for further miniaturization, HM-SIW technology is employed in the presented LWA. This LWA is also capable of CBS from −50 ° to + 26 ° in the frequency band of 10 GHz to 16.5 GHz with a maximum gain of 12 dBi. The final prototypes of the both these antenna are fabricated and measured results are in agreement with the simulated ones.

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Tai, Tzu-Chun, Hung-Wei Wu, Cheng-Yuan Hung, and Yeong-Her Wang. "Food Security Sensing System Using a Waveguide Antenna Microwave Imaging through an Example of an Egg." Sensors 20, no. 3 (January 27, 2020): 699. http://dx.doi.org/10.3390/s20030699.

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In this paper, we present a form of food security sensing using a waveguide antenna microwave imaging system through an example of an egg. A waveguide antenna system with a frequency range of 7–13 GHz and a maximum gain of 17.37 dBi was proposed. The maximum scanning area of the waveguide antenna microwave imaging sensing system is 30 × 30 cm2. In order to study the resolution and sensitivity of the waveguide antenna microwave imaging sensing system, the circular and triangular high-k materials (with the same thickness but with different dielectric constants of the materials) were used as the testing sample for observing the microwave images. By using the proposed waveguide antenna microwave imaging sensing system, the high-k materials with different dielectric constants and shapes could be easily sensed. Therefore, the waveguide antenna microwave imaging sensing system could be potentially used for applications in rapid, non-destructive food security sensing. Regarding the example of an egg, the proposed waveguide antenna microwave imaging sensing system could effectively identify the health status of many eggs very quickly. The proposed waveguide antenna microwave imaging sensing system provides a simple, non-destructive, effective, and rapid method for food security applications.

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Ulm, David, Thomas Kleine-Ostmann, and Thorsten Schrader. "Results of the national antenna intercomparison 2017/2018 within the German Calibration Service (Deutscher Kalibrierdienst – DKD)." Advances in Radio Science 17 (September 19, 2019): 35–44. http://dx.doi.org/10.5194/ars-17-35-2019.

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Abstract. In an intercomparison organized within the framework of the German Calibration Service (Deutscher Kalibrierdienst – DKD), seven different calibration laboratories participated in the measurement of the antenna factor for three different antennas according to different standards. Between August 2017 and April 2018, measurements have been performed on a hybrid antenna, a logarithmic-periodic antenna and on an Open Ended Waveguide.

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El Misilmani, H. M., M. Al-Husseini, and K. Y. Kabalan. "Improved Vlasov Antenna with Curved Cuts and Optimized Reflector Position and Shape." International Journal of Antennas and Propagation 2015 (2015): 1–12. http://dx.doi.org/10.1155/2015/193630.

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This paper presents a Vlasov antenna with curved cut shape and improved reflector position and geometry suitable for high power microwave applications. The curved shape of the proposed cut totally eliminates the sharp edges and angles present in Vlasov antennas with step and bevel cuts. Furthermore, with the proposed reflector configuration, the wave is radiated in the direction of the axis of the waveguide. A Vlasov antenna, designed for operation at 3 GHz, is used to compare the three cut types. An additional comparison is conducted to validate the concept of the enhanced reflector position, using the bevel-cut antenna and the improved cut. The proposed antenna results in increased antenna gain and in good performance in terms of sidelobe level and half-power beamwidth, with maximum radiation directed toward the axis of the waveguide center.

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Хахинов, Виталий, and Vitaliy Khakhinov. "Receiving antenna electrodynamic model in terms of waveguide representation of HF field." Solnechno-Zemnaya Fizika 4, no. 3 (September 28, 2018): 114–18. http://dx.doi.org/10.12737/szf-43201812.

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The receiving antenna is an important part of a radio channel that requires electrodynamic approach in mathematical simulation of its characteristics. Since the invention of radio, and due to further theoretical studies of radio signal transmission, the following situation has arisen: researchers’ attention to receiving antennas is inversely proportional to the factor by which their number exceeds the number of transmitting antennas. We address the problem of building a receiving antenna electrodynamic model in terms of a waveguide representation of HF field. Structurally, the antenna is considered as metal wires of a finite length and arbi-trary configuration. Current distribution in antenna is calculated using the long-line theory and normal-mode approach. The mathematical representation of the receiving antenna electrodynamic model is calculation expressions for receiving coefficients of normal modes. They reflect the effects of receiving antenna characteristics, including its directional pattern, on ef-fectiveness of the incident HF field energy conversion into the energy of the driven current waves and final distribution of net current in antenna. These expressions are used to derive the expression to calculate the effective length of the receiving antenna. The obtained mathematical expressions of the re-ceiving antenna electrodynamic model do not contradict the principle of antenna reciprocity. We present calculation formulas for the receiving coefficients and excitation of the isotropic antenna electromagnetic model.

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Bi, Xiaokun, Shaohua Guo, Yujian Zhu, and Tao Yuan. "A Wideband Slotted Spherical Waveguide Antenna Based on Multi-Mode Concept." Electronics 9, no. 10 (October 12, 2020): 1656. http://dx.doi.org/10.3390/electronics9101656.

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A wideband slotted spherical waveguide antenna based on the multi-mode concept is presented. The proposed design starts from a metallized spherical cavity fed by a rectangular waveguide. Then, two groups of slots are symmetrically cut on the shell. By suitably choosing the slot dimensions and locations, four radiation modes can be excited in a single radiator and merged with each other, resulting in a wideband radiation characteristic. To verify this, a prototype is designed and fabricated using stereolithography apparatus to achieve a light weight. As the measured fractional bandwidth (FBW) of the proposed antenna can be increased to 70.1% while maintaining stable radiation patterns and high gain, a simple and effective design of wideband slotted waveguide antennas with good radiation characteristics can be validated.

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Polat, Ersin, Henning Tesmer, Roland Reese, Matthias Nickel, Dongwei Wang, Peter Schumacher, Rolf Jakoby, and Holger Maune. "Reconfigurable Millimeter-Wave Components Based on Liquid Crystal Technology for Smart Applications." Crystals 10, no. 5 (April 27, 2020): 346. http://dx.doi.org/10.3390/cryst10050346.

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This paper presents recent development of tunable microwave liquid crystal (LC) components in the lower millimeter wave (mmW) regime up to the W-band. With the utilization of increasing frequency, conventional metallic waveguide structures prove to be impractical for LC-based components. In particular, the integration of the electric bias network is extremely challenging. Therefore, dielectric waveguides are a promising alternative to conventional waveguides, since electrodes can be easily integrated in the open structure of dielectric waveguides. The numerous subcategories of dielectric waveguides offer a high degree of freedom in designing smart millimeter wave components such as tunable phase shifters, filters and steerable antennas. Recent research resulted in many different realizations, which are analyzed in this paper. The first demonstrators of phased array antennas with integrated LC-based phase shifters are reviewed and compared. In addition, beam steering with a single antenna type is shown. Furthermore, the possibility to realize tunable filters using LC-filled dielectric waveguides is demonstrated.

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Kachhia, Jahnavi, Amit Patel, Alpesh Vala, Romil Patel, and Keyur Mahant. "Logarithmic Slots Antennas Using Substrate Integrated Waveguide." International Journal of Microwave Science and Technology 2015 (October 19, 2015): 1–11. http://dx.doi.org/10.1155/2015/629797.

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This paper represents new generation of slotted antennas for satellite application where the loss can be compensated in terms of power or gain of antenna. First option is very crucial because it totally depends on size of satellite so we have proposed the high gain antenna creating number of rectangular, trapezoidal, and I shape slots in logarithm size in Substrate Integrated Waveguide (SIW) structure. The structure consists of an array of various shape slots antenna designed to operate in C and X band applications. The basic structures have been designed over a RT duroid substrate with dielectric constant of 2.2 and with a thickness of 0.508 mm. Multiple slots array and shape of slot effects have been studied and analyzed using HFSS (High Frequency Structure Simulator). The designs have been supported with its return loss, gain plot, VSWR, and radiation pattern characteristics to validate multiband operation. All the proposed antennas give gain more than 9 dB and return loss better than −10 dB. However, the proposed structures have been very sensitive to their physical dimensions.

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BIMA, BIMA, LITA LIDYAWATI, and ARSYAD RAMADHAN DARLIS. "Implementasi Reflector Antena Wajanbolik Pada Layanan EVDO (Evolution Data Optimized)." ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika 1, no. 1 (January 1, 2013): 1. http://dx.doi.org/10.26760/elkomika.v1i1.1.

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ABSTRAKAntena merupakan perangkat yang memiliki peranan yang sangat penting dalam sistem komunikasi tanpa kabel (wireless). Pada penelitian ini akan diimplementasikan reflektor antena wajanbolik yang beroperasi pada frekuensi CDMA 2000 1x EVDO 1900 MHz. Antena ini menggunakan reflektor dari wajan, dengan waveguide dari pipa paralon yang dilapisi dengan lakban alumunium, dan penerima sinyal menggunakan USB modem adapter. Antena ini ditujukan untuk menjadi media bantu dalam memperkuat penerimaan sinyal EVDO dan memaksimalkan dan kecepatan transfer data. Antena ini memberikan gain sebesar 15,530 dB berdasarkan pengukuran dan 15,156 dB berdasarkan teoritis. Pengujian menggunakan wajanbolik menunjukkan adanya peningkatan level sinyal modem yang terendah sebesar 4 dB pada pengukuran dengan kondisi indoor di siang hari serta tertinggi sebesar 19 dB pada pengukuran dengan kondisi outdoor di malam hari. Hasil dari pengujian pun menunjukkan peningkatan kecepatan transfer data rata – rata sebesar 42 KBps sampai dengan 269 KBps dibandingkan pengukuran tanpa wajanbolik.Kata kunci: Reflektor, Waveguide, Wajanbolik, USB adapter, EVDO. ABSTRACTThe antenna is a device that has a very important role in wireless communication systems (wireless). In this research will be implemented wajanbolik reflector antenna which operates at frequencies of CDMA 2000 1x EVDO 1900 MHz. This antenna uses a reflector of the pan, with the waveguide of the pipe is coated with aluminum duct tape, and a signal receiver using a USB modem adapter. This antenna is intended to be a media aids in strengthening the EVDO and signal reception to maximize data transfer speeds. This antenna give a gain of 16.015 from measurement dBi and 15.156 dBi based on theory. Tests using wajanbolik showed an increase in the level of modem signals a low of 4 dB in measurement with indoor conditions during the day and 19 dB at the peak of measurements with outdoor conditions at night. Results of testing also showed an increase in average data transfer rate is 42 KBps up to 269 KBps compared to measurements without wajanbolik.Keywords: Reflector, Waveguide, Wajanbolic, USB adapter, EVDO.

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Soleiman Meiguni, J., S. Keshavarz Haddad, and A. Hosseinbeig. "Longitudinal slotted waveguide array feed networks." International Journal of Microwave and Wireless Technologies 10, no. 4 (March 5, 2018): 512–17. http://dx.doi.org/10.1017/s1759078718000259.

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AbstractIn this paper, two new feed network designs for single layer and double layer slotted waveguide array antennas are presented. A microstrip to substrate integrated waveguide transition is applied to the single layer antenna. The aperture coupling mechanism is used in order to find the optimum feed network for double-layer structure and to obtain stable radiation characteristics over the frequency band. The prototypes of the proposed antennas have been fabricated and tested. The measured results were compared very well with the simulation results obtained from CST microwave studio and showed low side lobe level at the center frequency of 11.5 GHz for the low-profile 4-channel slotted waveguide arrays.

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Luo, Guo Qing, Tian Yang Wang, and Xiao Hong Zhang. "Review of Low Profile Substrate Integrated Waveguide Cavity Backed Antennas." International Journal of Antennas and Propagation 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/746920.

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Low profile cavity backed antennas (CBA) based on substrate integrated waveguide (SIW) technology presented in published papers have been reviewed in this paper. Their operating mechanisms have been discussed and methods for improving the performance, such as bandwidth enhancement, size reduction, and gain improvement, have been presented. These novel antennas retain the advantage of conventional metallic cavity backed antenna, including high gain, high front-to-back ratio, and low cross polarization level, and also keep the advantages of planar antenna including low profile, light weight, low fabrication cost, and easy integration with planar circuit.

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Morozov, V. M., and V. I. Magro. "The features of the use of the waveguide radiators in smart antenna systems." Journal of Physics and Electronics 26, no. 1 (December 3, 2018): 89–92. http://dx.doi.org/10.15421/331815.

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The features of the use of finite waveguide antenna arrays in the structure of modern smart antenna systems are considered. The paper deals with the problem of diffraction of an electromagnetic wave on a finite waveguide antenna array scanning in the E-plane. Antenna array consists of five radiating elements. The open ends of the waveguides are surrounded by a metal screen. The resonator coupling region was chosen as matching elements. The solution of the problem is carried out by the integral equation method on the basis of the selection of overlapping regions. The problem reduces to solving the Fredholm integral equation of the second kind. An array of infinitely thin plates and that of waveguides with a finite wall thickness are considered. The main regularities for choosing the optimal geometric dimensions of the antenna array are established. Studies were carried out for arrays with a number of elements from five to fifteen. The analysis of edge effects in the final antenna array is carried out. It is shown that the introduction of a resonator region into a five-element lattice makes it possible to expand the sector of the radiation angles and avoid the effect of blinding. It is shown that this statement is valid not only for five-element lattices, but also for arrays with a large number of radiating elements. The radiation patterns are calculated. The coefficients of mutual coupling in an array with five elements are investigated. General recommendations for choosing optimal sizes of the resonator coupling region of radiators are considered.

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Ahmed, Aftab, Yuanjie Pang, Ghazal Hajisalem, and Reuven Gordon. "Antenna Design for Directivity-Enhanced Raman Spectroscopy." International Journal of Optics 2012 (2012): 1–8. http://dx.doi.org/10.1155/2012/729138.

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Antenna performance can be described by two fundamental parameters: directivity and radiation efficiency. Here, we demonstrate nanoantenna designs in terms of improved directivity. Performance of the antennas is demonstrated in Raman scattering experiments. The radiated beam is directed out of the plane by using a ground plane reflector for easy integration with commercial microscopes. Parasitic elements and parabolic and waveguide nanoantennas with a ground plane are explored. The nanoantennas were fabricated by a series of electron beam evaporation steps and focused ion beam milling. As we have shown previously, the circular waveguide nanoantenna boosts the measured Raman signal by 5.5x with respect to a dipole antenna over a ground plane; here, we present the design process that led to the development of that circular waveguide nanoantenna. This work also shows that the parabolic nanoantenna produces a further fourfold improvement in the measured Raman signal with respect to a circular waveguide nanoantenna. The present designs are nearly optimal in the sense that almost all the beam power is coupled into the numerical aperture of the microscope. These designs can find applications in microscopy, spectroscopy, light-emitting devices, photovoltaics, single-photon sources, and sensing.

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Zhu, Li, Xiang Jun Gao, and Long Zheng. "Design and Characterization of Miniaturized Slot Antennas Loaded with Silts for WiMAX/WLAN Applications." Applied Mechanics and Materials 644-650 (September 2014): 4459–62. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.4459.

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in this paper, a Novel slot antenna for multi-frequency operation with coplanar waveguide (CPW)-fed are designed, which is loaded with slits. The designed antenna operates over the frequency ranges of 860MHz (3.11GHz-3.97GHz) and 1170MHz (5.08-6.25GHz), respectively. The proposed antennas are suitable for WLAN 5.2/5.8GHz and WiMAX 3.5/5.5GHz applications.

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O, Jin, and Choi. "A Compact Four-Port Coplanar Antenna Based on an Excitation Switching Reconfigurable Mechanism for Cognitive Radio Applications." Applied Sciences 9, no. 15 (August 2, 2019): 3157. http://dx.doi.org/10.3390/app9153157.

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In this paper, we propose a compact four-port coplanar antenna for cognitive radio applications. The proposed antenna consists of a coplanar waveguide (CPW)-fed ultra-wideband (UWB) antenna and three inner rectangular loop antennas. The dimensions of the proposed antenna are 42 mm × 50 mm × 0.8 mm. The UWB antenna is used for spectrum sensing and fully covers the UWB spectrum of 3.1–10.6 GHz. The three loop antennas cover the UWB frequency band partially for communication purposes. The first loop antenna for the low frequency range operates from 2.96 GHz to 5.38 GHz. The second loop antenna is in charge of the mid band from 5.31 GHz to 8.62 GHz. The third antenna operates from 8.48 GHz to 11.02 GHz, which is the high-frequency range. A high isolation level (greater than 17.3 dB) is realized among the UWB antenna and three loop antennas without applying any additional decoupling structures. The realized gains of the UWB antenna and three loop antennas are greater than 2.7 dBi and 1.38 dBi, respectively.

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Sakli, Hedi. "Cylindrical Waveguide on Ferrite Substrate Controlled by Externally Applied Magnetic Field." Electronics 10, no. 4 (February 17, 2021): 474. http://dx.doi.org/10.3390/electronics10040474.

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This paper presents an extension of the formulation of wave propagation in transverse electric (TE) and transverse magnetic (TM) modes for the case of metallic cylindrical waveguides filled with longitudinally magnetized ferrite. The higher order modes were exploited. We externally controlled the cut-off frequency through the application of DC magnetic fields. The numerical results of dispersion diagrams for TE and TM modes were obtained and analyzed. We analyzed a waveguide antenna filled with partially magnetized ferrite using the mode matching (MM) technique based on the TE and TM modes. By using modal analysis, our approach considerably reduced the computation time compared to HFSS. Ferrites are important for various industrial applications, such as circulators, isolators, antennas and filters.

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Huang, W. N., Y. J. Cheng, and H. Deng. "Substrate Integrated Waveguide Leaky-Wave Antenna Conforming to Conical Shape Surface." International Journal of Antennas and Propagation 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/359670.

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A conical conformal leaky-wave antenna based on substrate integrated waveguide (SIW) technology is proposed and demonstrated in this paper. This antenna conforms to a conical shape surface with the angle of 40°. It has a narrow beam that scans from 80° to 97° with varying frequency (34 GHz~37 GHz). Both conformal and nonconformal antennas are fabricated through the standard PCB process. Their performances are compared within the desired frequency.

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Wong, Huey Shin, Mohammad Tariqul Islam, and Salehin Kibria. "Design and Optimization of LTE 1800 MIMO Antenna." Scientific World Journal 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/725806.

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A multiple input and multiple output (MIMO) antenna that comprises a printed microstrip antenna and a printed double-L sleeve monopole antenna for LTE 1800 wireless application is presented. The printed double-L sleeve monopole antenna is fed by a 50 ohm coplanar waveguide (CPW). A novel T-shaped microstrip feedline printed on the other side of the PCB is used to excite the waveguide’s outer shell. Isolation characteristics better than −15 dB can be obtained for the proposed MIMO antenna. The proposed antenna can operate in LTE 1800 (1710 MHz–1880 MHz). This antenna exhibits omnidirectional characteristics. The efficiency of the antenna is greater than 70% and has high gain of 2.18 dBi.

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Chin, S. J., M. Z. A. Abd Aziz, and M. R. Ahmad. "Microstrip-Fed Circular Disc Monopole Antenna with Defected Waveguide Structure." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 1 (February 1, 2018): 189. http://dx.doi.org/10.11591/ijece.v8i1.pp189-197.

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This paper presented the microstrip-fed circular disc monopole antenna with defected waveguide structure. First, the microstrip-fed circular disc monopole antenna was designed. Next, the monopole antenna was designed with waveguide and lastly followed by the defected waveguide structure where the uniplanar compact (UC) structure was used. CST Microwave studio software was used for simulation and parametric studies process. Initially, the microstrip-fed circular disc monopole antenna was designed to achieve return loss less than -10dB for wideband frequencies. Then, the gain and directivity was improved with the integration of waveguide. The highest directivity of 11.38dBi found at 13.5GHz. However, low efficiency and narrower bandwidth were obtained. Next, uniplanar compact defected waveguide structure (UC DWS) was designed at inner surface of waveguide. The bandwidth achieved 3.09GHz where it covered from 10.91GHz to 14GHz. Meanwhile, the directivity maintained higher than the monopole antenna with highest directivity of 8.84dBi at 10GHz. The gain was also improved from 11GHz to 14GHz with highest gain of 6.38dB occurred at 13.5GHz.

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Sun, Guang, Yi Liu, Taolin Liu, and Hu Yang. "Wideband and High-Efficiency SIW Cavity-Backed Magneto-Electric Dipole Antenna Array." International Journal of Antennas and Propagation 2019 (November 16, 2019): 1–16. http://dx.doi.org/10.1155/2019/9019034.

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In this paper, a compact, wideband, and high-efficiency substrate integrated waveguide (SIW) feeding cavity-backed aperture-coupled magneto-electric (ME) dipole antenna element and its array are proposed. Firstly, an SIW cavity-backed and a modified bowtie dipole are designed for the antenna element which makes it possess a high gain and wide impedance bandwidth. The antenna element covers an impedance bandwidth of 66.3% from 10.7 to 21.3 GHz with a peak gain of 10.3 dBi. Secondly, a 4 × 4 array is designed using the proposed antenna element. And a full-corporate substrate integrated waveguide feeding network is introduced to excite the array elements for the antenna application with wide bandwidth and high efficiency. For validation, a prototype of 4 × 4 array is fabricated by standard printed circuit board (PCB) facilities and further measured. The measured −10 dB impedance bandwidth of the proposed 4 × 4 antenna array is 30% (12.75–17.25 GHz) with its gain being 18.2–20.9 dBi within the entire band. The measured maximum aperture efficiency of the antenna array is 94% at 14.92 GHz. Notably, the measured results agree well with simulations, and it shows great advantages over other similar antennas on efficiency and bandwidth.

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Besso, Piermario, Maurizio Bozzi, Marco Formaggi, and Luca Perregrini. "Pointing enhancement techniques for deep-space antennas." International Journal of Microwave and Wireless Technologies 2, no. 2 (April 2010): 211–18. http://dx.doi.org/10.1017/s1759078710000139.

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The present paper presents a very efficient technique for enhancing the pointing accuracy in beam-waveguide (BWG) antennas and its application to the deep space antenna DSA2 of the European Space Agency. The proposed technique permits to achieve a twofold result: on the one hand, it provides a solution to the beam aberration issue, arising when the antenna simultaneously receives from and transmits to a spacecraft moving in the transversal direction. On the other hand, it allows to perform a fast conical scan to enhance the pointing accuracy of the antenna. Both results are achieved by simple linear displacements of feeds and mirrors located in the lower part of the BWG, with a very limited deterioration of the antenna gain. The required displacements of feeds and mirrors are determined through a fast optimization algorithm, based on a top-down approach, which requires repeated physical–optics analyses of the lower part of the beam waveguide only, with a significant reduction in the computing time.

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Ashok Kumar, Srinivasan, and Thangavelu Shanmuganantham. "Coplanar waveguide-fed ISM band implantable crossed-type triangular slot antenna for biomedical applications." International Journal of Microwave and Wireless Technologies 6, no. 2 (October 14, 2013): 167–72. http://dx.doi.org/10.1017/s1759078713000883.

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A novel coplanar waveguide fed Industrial, Scientific, and Medical (ISM) band implantable crossed-type triangular slot antenna is proposed for biomedical applications. The antenna operates at the center frequency of 2450 MHz, which is in ISM band, to support GHz wideband communication for high-data rate implantable biomedical application. The size of the antenna is 78 mm3 (10 mm × 12 mm × 0.65 mm). The simulated and measured bandwidths are 7.9 and 8.2% at the resonant frequency of 2.45 GHz. The specific absorption rate distribution induced by the implantable antenna inside a human body tissue model is evaluated. The communication between the implanted antenna and external device is also examined. The proposed antenna has substantial merits such as miniaturization, lower return loss, better impedance matching, and high gain over other implanted antennas.

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Ashok Kumar, Srinivasan, and Thangavelu Shanmuganantham. "Implantable CPW-fed rectangular patch antenna for ISM band biomedical applications." International Journal of Microwave and Wireless Technologies 6, no. 1 (December 3, 2013): 101–7. http://dx.doi.org/10.1017/s1759078713000986.

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Implantable antennas have recently been receiving substantial attention for medical diagnosis and treatment. In this paper, a coplanar waveguide-fed monopole antenna for industrial, scientific, and medical (ISM) band biomedical applications is proposed. The antenna has a simple structure is placed on human tissues such as muscle, fat, and skin. The designed antenna is made compatible for implantation by embedding it in an FR4 substrate. The proposed antenna is simulated using the method of moment's software IE3D by assuming the predetermined dielectric constant for the human muscle tissue, fat, and skin. The antenna operates in the frequency of ISM bands, 2.4–2.48 GHz. Simulated and measured gains attain −7.7 and −8 dBi in the frequency of 2.45 GHz. The radiation pattern, return loss, current distribution, and gain of these antennas were examined and characterized.

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Basavarajappa, Vedaprabhu, and Vincent Fusco. "Multiband evanescent waveguide antenna." Microwave and Optical Technology Letters 57, no. 3 (January 23, 2015): 540–42. http://dx.doi.org/10.1002/mop.28896.

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Nakaoka, K. "Coplanar waveguide array antenna." Electronics Letters 24, no. 7 (1988): 413. http://dx.doi.org/10.1049/el:19880280.

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Haraz, Osama M., Mohamed Abdel-Rahman, Najeeb Al-Khalli, Saleh Alshebeili, and Abdel Razik Sebak. "Performance Investigations of Quasi-Yagi Loop and Dipole Antennas on Silicon Substrate for 94 GHz Applications." International Journal of Antennas and Propagation 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/105625.

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This paper introduces the design and implementation of two high gain Quasi-Yagi printed antennas developed on silicon substrate for 94 GHz imaging applications. The proposed antennas are based on either driven loop or dipole antennas fed by a coplanar waveguide (CPW) feeding structure. For better matching with the driven antennas, a matching section has been added between the CPW feedline and the driven antenna element. To improve the gain of either loop or dipole antennas, a ground reflector and parasitic director elements have been added. Two Quasi-Yagi antenna prototypes based on loop and dipole antenna elements have been fabricated and experimentally tested using W-band probing station (75–110 GHz). The measured results show good agreement with simulated results and confirm that the proposed antennas are working. In addition, a feed and matching configuration is proposed to enable coupling a microbolometer element to the proposed Quasi-Yagi antenna designs for performing radiation pattern measurements.

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Sakakibara, Kunio, Kunihiko Ohkawa, Yutaka Aoki, and Nobuyoshi Kikuma. "RF Performance of Layer-Structured Broadband Passive Millimeter-Wave Imaging System." International Journal of Antennas and Propagation 2016 (2016): 1–11. http://dx.doi.org/10.1155/2016/6894676.

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Low profile and simple configuration are advantageous for RF module in passive millimeter-wave imaging system. High sensitivity over broad operation bandwidth is also necessary to detect right information from weak signal. We propose a broadband layer-structured module with low profile, simple structure, and ease of manufacture. This module is composed of a lens antenna and a detector module that consists of a detector circuit and a broadband microstrip-to-waveguide transition. The module forms a layer structure as a printed substrate with detector circuit is fixed between two metal plates with horn antennas and back-short waveguides. We developed a broadband passive millimeter-wave imaging module composed of a lens antenna and a detector module in this work. The gain and the antenna efficiency were measured, and the broadband operation was observed for the lens antenna. For the detector module, peak sensitivity was 8100 V/W. Furthermore, the detector module recognized a difference in the absorber’s temperature. The designs of the lens antenna and the detector module are presented and the RF performances of these components are reported. Finally, passive millimeter-wave imaging of a car, a human, and a metal plate in clothes is demonstrated in this paper.

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Althuwayb, Ayman A., Mohammad Alibakhshikenari, Bal S. Virdee, Harry Benetatos, Francisco Falcone, and Ernesto Limiti. "Antenna on Chip (AoC) Design Using Metasurface and SIW Technologies for THz Wireless Applications." Electronics 10, no. 9 (May 10, 2021): 1120. http://dx.doi.org/10.3390/electronics10091120.

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This paper presents the design of a high-performance 0.45–0.50 THz antenna on chip (AoC) for fabrication on a 100-micron GaAs substrate. The antenna is based on metasurface and substrate-integrated waveguide (SIW) technologies. It is constituted from seven stacked layers consisting of copper patch–silicon oxide–feedline–silicon oxide–aluminium–GaAs–copper ground. The top layer consists of a 2 × 4 array of rectangular metallic patches with a row of subwavelength circular slots to transform the array into a metasurface. This essentially enlarges the effective aperture area of the antenna. The antenna is excited using a coplanar waveguide feedline that is sandwiched between the two silicon oxide layers below the patch layer. The proposed antenna structure reduces substrate loss and surface waves. The AoC has dimensions of 0.8 × 0.8 × 0.13 mm3. The results show that the proposed structure greatly enhances the antenna’s gain and radiation efficiency, and this is achieved without compromising its physical size. The antenna exhibits an average gain and efficiency of 6.5 dBi and 65%, respectively, which makes it a promising candidate for emerging terahertz applications.

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Hussein, Yaqdhan Mahmood, Mohamad Kamal A. Rahim, Noor Asniza Murad, Mustafa Mohammed Jawad, Hatem O. Hanoosh, Huda A. Majid, and Hussam H. A. Keriee. "Substrate integrate waveguide and microstrip antennas at 28 GHz." Bulletin of Electrical Engineering and Informatics 9, no. 6 (December 1, 2020): 2462–68. http://dx.doi.org/10.11591/eei.v9i6.2190.

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In this paper, two antennas are designed using substrate integrated waveguide (SIW) and microstrip technology at 28 GHz. Parametric study for both antennas is presented to demonstrate the performance at millimeter wave frequency for wireless communication network (5G application). Roger RT5880 substrates with permittivity 2.2 and loss tangent 0.0009 are used to implement the antennas with two thicknesses of 0.508 mm and 0.127 mm respectively. Both antennas have the same size of substrate 12x12 mm with a full ground plane was used. Structures designs have been done by using computer simulation technology (CST). The simulation results showed that the antenna with SIW and roger RT 5880 substrate thickness 0.508 has better performance in term of return loss and radiation pattern than the microstrip patch antenna at 28 GHz. A return loss more than -10 dB and the gain are 6.4 dB obtained with wide bandwidth range of (27.4-28.7) GHz. This proving to increase the realized gain by implementing SIW at millimeter wave band for 5G application network.

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Meng, Hongfu, Yang Chen, and Wenbin Dou. "Design and Fabrication of W-Band Waveguide Slotted Array Antenna Based on Milling Process." International Journal of Antennas and Propagation 2020 (February 14, 2020): 1–6. http://dx.doi.org/10.1155/2020/1642174.

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A single-layer waveguide slotted array antenna is proposed for W-band applications. To eliminate the alignment errors, all structures including the radiation slots, radiation waveguides, and power divider network are realized in one layer based on the milling process, and a planar metal plate is employed to cover the bottom. For example, an 8 × 9 array is designed with 1-to-8 power divider network to validate the proposed technology. The effective radiation aperture size of the array is 24 mm × 21 mm, and the height is only 8 mm. The measured reflection coefficient of the antenna is larger than 3 GHz for S11 < −10 dB. The peak gain is 25.9 dBi, and the corresponding antenna efficiency is about 65%. All cross-polarization of the antenna array is less than −35 dB. The proposed array antenna features a simple structure, low cost, and easy implementation for W-band applications.

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Chandra, Avinash, and Sushrut Das. "Application of SRRs in conventional waveguide slot array to achieve performance improvement and dual-band characteristics." International Journal of Microwave and Wireless Technologies 9, no. 5 (September 19, 2016): 1085–91. http://dx.doi.org/10.1017/s1759078716001057.

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This paper presents application of split ring resonators (SRR) in conventional waveguide slot array antenna to achieve performance improvement and multiband characteristics. Three SRRs have been placed on the transverse plane of a conventional slotted waveguide and has been simulated and measured. The measured results show that the antenna has dual band response with respective 10 dB return loss bandwidth 8.23–9.23 GHz (11.45%) and 9.68–11.01 GHz (12.87%). The measured gain and radiation pattern reveal that the proposed antenna has higher gain and front to back radiation ratio as compared with a conventional slotted waveguide antenna. Equivalent circuit of the proposed antenna also has been presented.

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Hammu-Mohamed, Bilal, Ángel Palomares-Caballero, Cleofás Segura-Gómez, Francisco G. Ruiz, and Pablo Padilla. "SIW Cavity-Backed Antenna Array Based on Double Slots for mmWave Communications." Applied Sciences 11, no. 11 (May 24, 2021): 4824. http://dx.doi.org/10.3390/app11114824.

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This paper presents a cavity-backed antenna array in substrate integrated waveguide (SIW) technology in the millimeter-wave frequency band. The proposed antenna design uses double slots as radiating elements instead of conventional single slots. The double slots allow better control in the design of the operating frequency bands of the cavity-backed antenna. The performance of the cavity-backed antennas with single and double slots is compared to assess the enhanced behavior of the double slots. As a proof of concept, a 2 × 2 array of cavity-backed antennas is designed, manufactured, and measured. Each cavity-backed antenna contains 2 × 2 double slots; thus, a 4 × 4 antenna array is considered. The experimental operating frequency band of the proposed antenna array ranges from 35.4 to 37 GHz. There is a good agreement between the simulated and measured results. The measured gain is around 17 dBi in the whole operating frequency band with a 75% total antenna efficiency.

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Qi, Mei Qing, He-Xiu Xu, Hui Feng Ma, Mou Ping Jin, Wei Wang, and Tie Jun Cui. "A Wideband Waveguide Antenna with Nearly Equal E- and H-Plane Radiation Patterns." International Journal of Antennas and Propagation 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/608393.

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A novel wideband waveguide antenna with excellent performance is proposed, which is composed of a coaxial-waveguide transition and an open-ended rectangular waveguide loaded with a pair of horizontal umbrella-shaped metallic brims. The brims perpendicular to two broad walls of the waveguide are constructed to modulate the antenna to radiate nearly identical E- and H-plane radiation patterns. A wideband impedance matching performance is achieved with a fractional bandwidth of 40% through the introduction of short-stepped ladders. The antenna has the advantages of simple structure, symmetric radiation pattern, low-cross polarization, moderate back lobe, and almost constant beamwidth.

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Kumar, S. Ashok, and T. Shanmuganantham. "Implantable CPW Fed Circular Slot Antennas at 2.45 GHz ISM Band for Biomedical Applications." Journal of Circuits, Systems and Computers 24, no. 01 (November 10, 2014): 1550014. http://dx.doi.org/10.1142/s0218126615500140.

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A novel coplanar waveguide (CPW) fed circular slot antennas are proposed for industrial, scientific and medical (ISM) band (2.4–2.48 GHz) applications. To make the designed antenna suitable for implantation, it is embedded in biocompatible Al2O3 ceramic substrate. The antenna was simulated by immersing it in a phantom liquid, imitating the electrical properties of the human muscle tissue. A study of the sensitivity of the antenna performance as a function of the dielectric parameters of the environment in which it is immersed was performed. Simulations in various dimensions state demonstrate that the antenna covers the complete ISM band. The demonstration among the design EM characteristics of the antenna is presented by current distributions.

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Abbosh, Amin M. "Design of a CPW-Fed Band-Notched UWB Antenna Using a Feeder-Embedded Slotline Resonator." International Journal of Antennas and Propagation 2008 (2008): 1–5. http://dx.doi.org/10.1155/2008/564317.

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A complete design method for a compact uniplanar ultra-wideband antenna with subband rejection capability is presented. A slotline resonator is incorporated in the coplanar waveguide feeder of the antenna to act as a bandstop filter, hence enabling the rejection of any undesired band within the passband of the antenna. Two samples of the proposed antenna were designed and manufactured. One of the developed antennas does not contain a resonator, whereas the other contains a slotline resonator. The designed antennas feature a compact size of 27 mm×27 mm. Results of the simulation and measurement show that the designed antennas have a bandwidth from 3 GHz to more than 11 GHz. The results also reveal that the use of the resonator in the feeder of the antenna efficiently rejects any undesired subband, such as the 4.9–5.9 GHz band assigned for IEEE802.11a and HIPERLAN/2. The gain of the antennas with the resonator is about 2.2 dBi at the passband, while it is less than −8 dBi at the rejected subband.

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Kumari, Vandana, Wriddhi Bhowmik, and Shweta Srivastava. "Design of high-gain SIW and HMSIW H-plane horn antenna using metamaterial." International Journal of Microwave and Wireless Technologies 7, no. 6 (July 15, 2014): 713–20. http://dx.doi.org/10.1017/s1759078714000920.

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In this paper, a substrate-integrated waveguide (SIW) H-plane horn antenna has been designed for X-band applications. Metamaterial is incorporated for performance enhancement of the designed antenna. Capacitively loaded loop is used as the unit cell of metamaterial for achieving negative values of relative permittivity and relative permeability. A half-mode SIW H-plane horn antenna is also proposed in this paper which reduces the size of the antenna without much effect on its performance. Metamaterial is integrated on the half-mode horn as well for improvement in gain and radiation pattern. The antennas are fabricated and tested. Excellent agreement between the measured and simulated results was obtained.

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Kirpanev, A. V., and A. N. Mikhailov. "Dual-frequency offset transreflector antennas." Issues of radio electronics, no. 8 (August 7, 2019): 71–78. http://dx.doi.org/10.21778/2218-5453-2019-8-71-78.

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The paper presents the results of computer simulation of the developed dual‑frequency antennas with a common radiating aperture, operating in the millimeter and centimeter wavelength range. The operation of antennas in the Kaand W‑bands is based on the well‑known dual reflector polarization rotating antennas constructing principles. The twistreflector of the considered antennas is combined with the radiation surface of the centimeter wavelength range (X‑band) waveguide‑slot array. Transreflector is made by offset scheme. For the Kaand X‑bandsantenna, the transreflector is a paraboloid of rotation part. In the case of the Wand X‑band antenna, the transreflector has a flat Fresnel zoned antenna structure. Computer simulation is based on the method of finite integrals, which provides a reliable result at an appropriately chosen sampling step. The calculated characteristics confirm the operability of the considered antenna options.

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Wu, Changying, Congxiang Li, Chufeng Hu, and Yevhen Yashchyshyn. "Dual-Polarization and Low-Sidelobe Corrugated Rectangular Horn Antennas for Outdoor RCS Measurement." Frequenz 74, no. 1-2 (January 28, 2020): 33–40. http://dx.doi.org/10.1515/freq-2019-0039.

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AbstractOutdoor radar cross section (RCS) measurement suffers background clutter. Such clutter needs to be minimized, especially when measuring low RCS level objects. To do this, a pair of corrugated horn antennas with a rectangular aperture has been designed, fabricated, and measured to improve the performance of outdoor RCS measurement. This antenna consists of a coaxial-waveguide adaptor, a square-rectangular waveguide transition, a corrugated rectangular horn, and chokes. A comparison of the performances of several corrugation profiles is provided. The tangential profile surpasses others because it provides the necessary low sidelobe level and narrow elevation beamwidth. The proposed antenna achieves −30 dB sidelobe level, fan-shaped beam pattern, and dual-polarization with −26 dB cross-polarization level over the band from 8.5 GHz to 12.5 GHz. The effectiveness of the antenna has been verified experimentally on a roof with two corner reflectors that were deployed intentionally to enlarge the effects of background clutter.

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Journal articles on the topic 'Waveguide antenna'

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