Journal articles: 'Circular antenna'

1

Eardprab, Sanchai, Chuwong Phongcharoenpanich, and Danai Torrungrueng. "Improvement of a Circular Microstrip Antenna Excited by Four Feeds and Suspended with Artificial Magnetic Conductors." International Journal of Antennas and Propagation 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/310686.

Full text

Abstract:

The proposed antenna is a circular microstrip structure excited by four feeds and suspended with artificial magnetic conductors (AMCs). The multifeed circular microstrip antennas can generate a high circularly polarized performance by using a different feed arrangement. AMC structures with a square, circular, or octagonal patch on a unit cell are designed and applied to circular microstrip patch antennas for the enhancement of antenna performance. It is found that simulated results of the proposed antenna are well suited. The properties of wide beamwidth with good axial ratio can be achieved when applying the proposed AMC structures to circular microstrip antennas. The antenna prototype was fabricated to validate simulated results.

APA, Harvard, Vancouver, ISO, and other styles

2

Squadrito, Paolo, Patrizia Livreri, Loreto Di Donato, Concetto Squadrito, and Gino Sorbello. "A Telemetry, Tracking, and Command Antennas System for Small-Satellite Applications." Electronics 8, no. 6 (June 18, 2019): 689. http://dx.doi.org/10.3390/electronics8060689.

Full text

Abstract:

Circularly polarized (CP) antennas are used in space applications for telemetry tracking and command (TT&C). In this paper, we present an antenna for a TT&C system that can employ only four antennas to achieve a wide quasi-isotropic coverage. The proposed single-feed circular polarized annular patch antenna is low profile and compact. It exhibits a wide impedance bandwidth of 19.7%, wide-angle circular polarization with an on-axis maximum gain higher than 6 dBi and an axial ratio below 4 dB in the frequency band 2.0–2.3 GHz. The developed low-cost antenna can be used for small-satellite data downlink where only two right hand circular polarized (RHCP) antennas and two left hand circular polarized (LHCP) antennas would be required since each antenna has an adequate CP gain on a wide angle. A prototype antenna has been fabricated and measured. The experimental validation shows a good agreement of the measured impedance bandwidth, axial ratio, and far-field pattern with the ones predicted by numerical full-wave study.

APA, Harvard, Vancouver, ISO, and other styles

3

Zainud-Deen, S., S. Abd Elhamied, and H. Abd El-Azem Malhat. "Integrated Millimeter-Wave Antennas for On-Chip Communication." Advanced Electromagnetics 5, no. 1 (March 12, 2016): 22. http://dx.doi.org/10.7716/aem.v5i1.333.

Full text

Abstract:

This paper introduces the design and analysis of circularly polarized (CP) and dual-polarized on-chip microstrip antennas for wireless communication at 60 GHz. The CP on-chip antenna consists of a circular aluminum patch with two overlapped circular slots fed by the transmission line. The radiation characteristics of the CP have been analyzed using the finite integration technique and finite element method based electromagnetic solvers. The CP antenna introduces left-hand circular polarization and employs as on-chip transmitter. A design of dual-polarized on-chip microstrip antenna at 60 GHz is investigated and is employed as on-chip receiver. The dual ports of the dual polarized antenna are designed with high isolation between them in order to be used as a two on-chip receivers. The radiation characteristics of the dual-port antenna have been calculated. The effect of the separation distance between the CP-antenna and the dual-polarized antenna on the same chip has been investigated. The performance parameters like the reflection coefficient, transmission coefficient, and the transmission gain of the two antennas at different separation distances have been introduced.

APA, Harvard, Vancouver, ISO, and other styles

4

Prof. Romi Morzelona. "Evaluation and Examination of Aperture Oriented Antennas." International Journal of New Practices in Management and Engineering 6, no. 01 (March 31, 2017): 01–07. http://dx.doi.org/10.17762/ijnpme.v6i01.49.

Full text

Abstract:

The exhaustive evaluation and analysis of aperture oriented antennas for different dimensions at two different frequencies (1800 MHz and 2.4 GHz) is presented in this paper. Design and comparison of the antennas for their performance is done through MATLAB. It is inferred that the circular aperture antenna has 95% higher directivity than rectangular aperture antenna. In addition, for the circular aperture antenna HPBW is 0.2849 degrees and for rectangular aperture HPBW is 1.0143 degrees. Also, circular patch antenna has less side lobe power than that of rectangular aperture antenna.

APA, Harvard, Vancouver, ISO, and other styles

5

Hajlaoui, El Amjed, and Ziyad Almohaimeed. "Analysis and Development of an Efficient Cross-Slot Loaded Compact Electromagnetic Band Gap Antenna." Applied Computational Electromagnetics Society 36, no. 6 (August 6, 2021): 734–39. http://dx.doi.org/10.47037/2020.aces.j.360615.

Full text

Abstract:

This paper is devoted to a novel Electromagnetic Band Gap (EBG) single-feed circularly polarized microstrip EBG antenna with compact size proposed for C-Band applications. The antenna structure will include eight slits introduced at the boundary and the corners in the radiating square patch with a cross-slot at the center. The provided study will effectively approve the various proposed structures and interest occupied by these types of antennas in the enhancement of output parameters (gain, directivity, radiation efficiency, and bandwidth) without much affecting the operating bandwidth at C-band. At first, the concept and the realization of a directive and circularly polarized antenna using an electromagnetic band gap material whose circular polarization is generated by the structure itself is discussed. The analysis and simulation results are presented for an antenna operating at 6.1 GHz using computer Simulation Technologies (CST). Furthermore, the new compact circular polarized EBG antenna, compared to experimental results, will confirm the pre-studied goal of these kinds of antennas such as radiation efficiency, polarization purity, radiation efficiency, high directivity, and gain.

APA, Harvard, Vancouver, ISO, and other styles

6

Ghorbani, Mehdi, and Habib Ghorbaninejad. "A Novel Ultrawideband Gear-Shaped Dielectric Ring Resonator Antenna." Mathematical Problems in Engineering 2021 (July 12, 2021): 1–8. http://dx.doi.org/10.1155/2021/8069873.

Full text

Abstract:

In this study, a novel ultrawideband (UWB) dielectric ring resonator (DRR) antenna has been proposed. DRR antennas include a single monopole antenna in the center of a ground plane and a dielectric with a symmetric structure around the monopole. This structure will lead to ultrawide band antenna. However, it is still possible to enhance the antenna bandwidth. In this study, we combine the DRR structure with an array antenna. The proposed antenna includes a circular array of four triangle resonators, which is rotated around the center of the triangle base to form a gear-shaped ring resonator antenna. In this design, characteristics of all these antennas are combined to enhance the antenna bandwidth including triangular dielectric resonator, circular array antenna, dielectric ring resonator structure, and a quarter-wave electric monopole. Triangular dielectric resonator antennas are wideband and in small size. Ring resonator antennas are inherently ultrawideband. Quarter-wave electric monopole and circular array structure can also enhance antenna bandwidth. This novel shape of the DRR antenna possesses the wider impedance bandwidth compared to similar works. Impedance bandwidth is 150% (5.2–36.1 GHz), and the bandwidth ratio is 1 : 6.9, which is much greater than earlier reports.

APA, Harvard, Vancouver, ISO, and other styles

7

Khandelwal, Mukesh Kumar, Binod Kumar Kanaujia, Santanu Dwari, Sachin Kumar, and Anil Kumar Gautam. "Triple band circularly polarized compact microstrip antenna with defected ground structure for wireless applications." International Journal of Microwave and Wireless Technologies 8, no. 6 (March 12, 2015): 943–53. http://dx.doi.org/10.1017/s1759078715000288.

Full text

Abstract:

Asymmetric slits loaded irregular shaped microstrip patch antenna with three different ground structures is proposed. All three antennas show triple band characteristics. First antenna with regular ground plane resonates at 1.95, 2.4, and 4.90 GHz with good radiation characteristics and shows right-hand circular polarization at 1.95 GHz. 18.75% of compactness is achieved with triple band characteristics. Further, same patch is used with different defected ground structures. Second antenna resonates at 1.85, 2.4, and 4.85 GHz with suppressed cross-polarization level and antenna shows right-hand circular polarization at 1.85 and 4.85 GHz. Compactness is further improved to the value of 22.91%. The third antenna resonates at 1.95, 2.4, and 4.85 GHz with better gain and radiation characteristics and antenna shows right-hand circular polarization at 1.95 and 2.4 GHz. The small frequency ratio f2/f1 is achieved and the value of f2/f1 is 1.29 and 1.23 for second and third configuration, respectively. Proposed structures show right-hand circularly polarized with suppressed left-hand circularly polarized radiations and suitable for fixed mobile wireless communication applications. All structures are analyzed using Ansoft HFSS v.14 based on finite element method and measured results satisfy the simulated results.

APA, Harvard, Vancouver, ISO, and other styles

8

Sabban, Albert. "New Compact Wearable Metamaterials Circular Patch Antennas for IoT, Medical and 5G Applications." Applied System Innovation 3, no. 4 (October 8, 2020): 42. http://dx.doi.org/10.3390/asi3040042.

Full text

Abstract:

The development of compact passive and active wearable circular patch metamaterials antennas for communication, Internet of Things (IoT) and biomedical systems is presented in this paper. Development of compact efficient low-cost wearable antennas are one of the most significant challenges in development of wearable communication, IoT and medical systems. Moreover, the advantage of an integrated compact low-cost feed network is attained by integrating the antenna feed network with the antennas on the same printed board. The efficiency of communication systems may be increased by using efficient passive and active antennas. The system dynamic range may be improved by connecting amplifiers to the printed antenna feed line. Design, design considerations, computed and measured results of wearable circular patch meta-materials antennas with high efficiency for 5G, IoT and biomedical applications are presented in this paper. The circular patch antennas electrical parameters on the human body were analyzed by using commercial full-wave software. The circular patch metamaterial wearable antennas are compact and flexible. The directivity and gain of the antennas with Circular Split-Ring Resonators (CSRR) is higher by 2.5dB to 3dB than the antennas without CSRR. The resonant frequency of the antennas without CSRR is higher by 6% to 9% than the antennas with CSRR. The computed and measured bandwidth of the stacked circular patch wearable antenna with CSRR for IoT and medical applications is around 12%, for S11 lover than −6dB. The gain of the circular patch wearable antenna with CSRR is around 8dBi.

APA, Harvard, Vancouver, ISO, and other styles

9

Jiang, Guo Xing. "The Design of Dual Band Circularly Polarized Patch Antenna for Civilian GPS Applications." Applied Mechanics and Materials 397-400 (September 2013): 1967–71. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.1967.

Full text

Abstract:

Antenna is all important part of GPS receivers，there is a great need for the design and production of new antennas which are fully compatible with modernized signals. Because of their advantages such as low cost, compact size, low profile，ability to support dual-frequency and circular polarization operation, microstrip patch antennas have become widely used in GPS antenna designs. A circular polarization patch antennas are proposed in the paper. The antenna designed to operate at L1(1575.42MHz) and L5(1176.45MHz)frequency bands. Initially, a comer-truncated patch antenna for GPS L1 operation was designed to validate simulation in Ansoft High Frequency Structure Simulator(HFSS), the results obtained for this antenna were used to design the two proposed antennas,and designed antennas are presented．

APA, Harvard, Vancouver, ISO, and other styles

10

Nalanagula, Rajasekhar, Naresh K. Darimireddy, Runa Kumari, Chan-Wang Park, and R. Ramana Reddy. "Circularly Polarized Hybrid Dielectric Resonator Antennas: A Brief Review and Perspective Analysis." Sensors 21, no. 12 (June 15, 2021): 4100. http://dx.doi.org/10.3390/s21124100.

Full text

Abstract:

Recently, it has been a feasible approach to build an antenna, in view of the potential advantages they offer. One of the recent trends in dielectric resonator antenna research is the use of compound and hybrid structures. Several considerable investigations have been already underway showing quite interesting and significant features in bandwidth, gain, and generation of circular polarization. A critical review on a journey of circularly polarized hybrid dielectric resonator antennas is presented in this article. A general discussion of circular polarization and DR antennas are provided at the forefront. Evolution, significant challenges, and future aspects with new ideas in designing hybrid dielectric resonator antennas are indicated at the end of the review. State-of-the-art advances and associated design challenges of circularly polarized hybrid DR antennas and related empirical formulas used to find resonance frequency of different hybrid modes produced are discussed in this paper.

APA, Harvard, Vancouver, ISO, and other styles

11

Kumar, Sachin, Gwan Hui Lee, Dong Hwi Kim, Wahab Mohyuddin, Hyun Chul Choi, and Kang Wook Kim. "A compact four-port UWB MIMO antenna with connected ground and wide axial ratio bandwidth." International Journal of Microwave and Wireless Technologies 12, no. 1 (July 8, 2019): 75–85. http://dx.doi.org/10.1017/s1759078719000874.

Full text

Abstract:

AbstractA new design method of an ultra-wideband circularly-polarized planar multiple-input-multiple-output (MIMO) antenna is presented in this paper. The proposed MIMO antenna consists of four unit cell antennas, being comprised of a microstrip feed line and a square slotted ground plane. In the proposed unit cell design, a circular stub is protruded from the ground plane strip for achieving circular polarization. The unit cell of the MIMO antenna is optimized by adjusting design parameters. The compact four-port MIMO antenna prototype is designed on the FR4 substrate with the overall dimensions of 45 × 45 × 1.6 mm3. The proposed four-port MIMO antenna design provides an impedance bandwidth (S11 < −10 dB) of 112% (3.1–11 GHz) and a 3 dB axial ratio bandwidth of 36% (4.8–6.9 GHz). The performance of the fabricated MIMO antenna shows good agreement between the EM simulation and measurement results.

APA, Harvard, Vancouver, ISO, and other styles

12

Sitompul, Peberlin Parulian, Josaphat Tetuko Sri Sumantyo, Farohaji Kurniawan, and Mohammad Nasucha. "Axial Ratio and Gain Enhancement of a Circular-Ring Slot Antenna Using a Pair of Asymmetrical Rectangular Slots and a Parasitic Patch for a Radio Beacon on a Nanosatellite." Aerospace 6, no. 4 (March 28, 2019): 39. http://dx.doi.org/10.3390/aerospace6040039.

Full text

Abstract:

Radio beacons enable measurements of ionospheric radio scintillations and total electron content (TEC). These beacons transmit unmodulated, phase-coherent waves in S-band frequencies. Many satellite applications require circularly polarized (CP) wideband antennas. Their compact size, lightweight, and simple fabrication method make CP antennas suitable for small satellite systems. The slot antenna has wideband impedance, but the 3 dB axial ratio bandwidth (ARBW) is narrower compared to the impedance bandwidth (IBW). In this paper, a circularly polarized circular-slotted antenna (CSA) is proposed to enhance the ARBW and the antenna gain. A pair of asymmetrical rectangular slots, a simple 50 Ω feedline and a parasitic patch were introduced to a CSA to enhance the 3 dB ARBW and the antenna gain. Rectangular slots were inserted on the diagonal axis of the CSA, the feedline was shifted to the left side of the x-axis, and a parasitic patch was attached to the circular slot. The lengths of the rectangular slots correspond to the resonant frequency, and the parasitic patch width corresponds to the higher frequency of the 3 dB ARBW. The asymmetrical rectangular slots, the shifted feedline, and the parasitic patch successfully improved the measured 3 dB ARBW of the antenna by 787.5 MHz or 35.79%. The measured gain of a CSA with left-hand circular polarization (LHCP) was also improved by shifting the feedline and the rectangular slot, achieving a peak gain of 5 dBic.

APA, Harvard, Vancouver, ISO, and other styles

13

Daliri, Ali, Amir Galehdar, Wayne ST Rowe, Kamran Ghorbani, and Sabu John. "Utilising microstrip patch antenna strain sensors for structural health monitoring." Journal of Intelligent Material Systems and Structures 23, no. 2 (December 28, 2011): 169–82. http://dx.doi.org/10.1177/1045389x11432655.

Full text

Abstract:

In this article, the feasibility of using a circular microstrip patch antenna to measure strain and the effects of different materials on sensitivity of the patch antenna are investigated. Also, the effect of strain direction on the frequency shift is studied. The theoretical model shows a linear relationship between strain and the shift in the resonant frequency of the antenna in any material. Both finite element analysis (FEA) and experimental tests have been undertaken to corroborate the relationship between strain and frequency shift. In addition, a new antenna sensor based on a meandered microstrip patch antennas has been designed and tested to overcome the shortcomings of the circular patch. The meandered circular microstrip patch antenna exhibited a threefold increase in sensitivity and a fivefold reduction in its physical size, when compared to the simple circular patch. The ultimate intention of this work is to configure antennas for the detection of relatively small damage zones in structures and to do so wirelessly.

APA, Harvard, Vancouver, ISO, and other styles

14

Premalatha, J., D. Sheela, and M. Abinaya. "Reconfiguration of Circular Microstrip Patch Antenna for Wireless Applications." International Journal of Engineering & Technology 7, no. 3.6 (July 4, 2018): 348. http://dx.doi.org/10.14419/ijet.v7i3.6.15130.

Full text

Abstract:

Reconfigurable antennas provide a possible solution to solve the related problems using the ability to switch frequency, patterns and polarization. This paper represents a possible application in wireless communication using reconfigurable Microstrip patch antenna. The dielectric substrate of proposed circular Microstrip patch antenna is fabricated with FR 4 epoxy and patch design 40x40x1.6mm. This work provides a methodology to design reconfigurable antennas with PIN diode switch. The frequency reconfiguration achieved by PIN diodes At the range of 3 GHZ to 6.9 GHZ the frequency reconfigurability is realized. To resonate the antenna at various frequencies PIN diode is used. Simulation of Ansoft HFSS software is used to compute the gain, axial ratio, radiation pattern, and return loss of proposed antenna. The structure of circular patch antenna achieves an enhanced wide bandwidth. The results show a better frequency reconfiguration.

APA, Harvard, Vancouver, ISO, and other styles

15

Ballandovich, Svyatoslav V., Grigory A. Kostikov, Liubov M. Liubina, and Mikhail I. Sugak. "PERFORMANCE ANALYSIS FOR DIRECTION-FINDING CIRCULAR ANTENNA ARRAY." Journal of the Russian Universities. Radioelectronics, no. 6 (January 18, 2019): 20–29. http://dx.doi.org/10.32603/1993-8985-2018-21-6-20-29.

Full text

Abstract:

This paper considers circular antenna arrays comprised of symmetrical dipole radiators applied in communication, navigation and monitoring systems. Despite their widespread use, a number of significant issues is underinvestigated. Among them are frequency dependence of the antenna factor (the ratio of the electric field intensity module to the voltage amplitude at the load connected to the output terminals) of the circular antenna array elements in the correct electrodynamic setting. The purpose of this paper is to analyse the antenna factor frequency dependence of a single dipole antenna with different geometry and load both in free space and as circular antenna element. The estimation of phase difference error between the circular antenna array elements caused by their cross coupling is also of interest.Specific expressions are obtained for the antenna factor of the dipole antenna for single-mode and three-mode approximations. The limits of their applicability in frequency band are considered. The solution to the coupled integral equations is obtained using the Galerkin method with piecewise sinusoidal current distribution and with an arbitrary number of basis functions for eight- and four-element circular antenna array. This solution may be generalized to an arbitrary number of circular antenna array elements. It is demonstrated that to improve the antenna factor frequency dependence it is advisable to use dipole antennas with high-resistance load, as well as with large diameter. Phase errors for different circular antenna array element signals are considered with respect to the reference element. The dependence of these phase errors on the circular antenna array geometry is presented. It is concluded that there are significant oscillations of the antenna factor when the dipole is the part of the circular antenna array. They are caused by cross coupling between the circular antenna array elements, which significantly depend on the element spacing. The results presented may be of interest to phase direction finder development engineers.

APA, Harvard, Vancouver, ISO, and other styles

16

Saraswat, Kapil, Trivesh Kumar, and A. R. Harish. "A corrugated G-shaped grounded ring slot antenna for wideband circular polarization." International Journal of Microwave and Wireless Technologies 12, no. 5 (January 23, 2020): 431–36. http://dx.doi.org/10.1017/s1759078719001624.

Full text

Abstract:

AbstractIn this paper, a wideband circularly polarized corrugated G-shaped grounded ring slot antenna is presented. The proposed antenna structure is excited using a coplanar waveguide-fed monopole antenna, which is placed inside a corrugated G-shaped grounded ring. Due to the asymmetry in the ground plane, two orthogonal modes, having equal magnitude and out of phase by 90° are excited, resulting in circular polarization (CP). The generation of the CP in the proposed antenna structure is explained using thin dipole current element approximation. A prototype of the proposed antenna is fabricated and tested. The measured results exhibit a 3 dB axial ratio bandwidth of 37.6% (2.22–3.25 GHz), and reflection coefficient bandwidth (|S11| ≤ −10 dB) of 47.91% (2.13–3.47 GHz). Additionally, the design guidelines are also presented for G-shaped grounded ring slot antennas.

APA, Harvard, Vancouver, ISO, and other styles

17

Li, Wen Tao, Shunlai Sun, Nana Qi, and Xiaowei Shi. "Reconfigurable Graphene Circular Polarization Reflectarray/Transmitarray Antenna." Frequenz 73, no. 3-4 (February 25, 2019): 77–88. http://dx.doi.org/10.1515/freq-2018-0156.

Full text

Abstract:

Abstract Reconfigurable reflectarray/transmitarray antennas have found broad applications in wireless communication due to their low cost, small size, flexible design, and superior performance. However, one common drawback of most current designs is the complex reconfiguration operation, which restricts their further applications. In this research, a new design strategy for reconfigurable reflectarray/transmitarray antennas is proposed and shown. Specifically, a circularly polarized $11 \times 11$ unit-cell graphene-based reflectarray/transmitarray antenna covering an area of $1.1 \times 1.1$ mm2 is designed, with a graphene-based frequency selective surface (FSS) as a ground. By adjusting the electric field, a dynamic change in the complex conductivity of graphene is achieved, which in turn changes the phase and the resonance point of the reflected or transmitted wave at the element. By tuning the size of the patch and changing the chemical potential of graphene, the element of the reflectarray/transmitarray operated at 1 THz can provide a dynamic phase range of more than ${360^ \circ }$. The simulation results show that the designed antenna can be dynamically reconfigured between the circularly polarized reflectarray/transmitarray antenna of the single structure, and has potential applications in emerging terahertz communication systems.

APA, Harvard, Vancouver, ISO, and other styles

18

Antonov, A. S., V. V. Balenkov, and E. L. Kapylov. "Wideband antenna with circular polarization for GLONASS system." Issues of radio electronics, no. 3 (June 25, 2021): 4–13. http://dx.doi.org/10.21778/2218-5453-2021-3-4-13.

Full text

Abstract:

The article analyzes the requirements for antennas used in modern anti-jamming navigation equipment of the consumer of GLONASS. Some options and their disadvantages are considered. Presents the results of the development, computer modeling and experimental study of a breadboard circular polarization antenna layout for the GLONASS system. Tests were carried out for both a single antenna layout and a two-element antenna array. Experimental frequency dependences of such parameters as matching, isolation, gain and axial ratio, as well as radiation patterns at key frequencies are given. The achieved bandwidth covers the L1 and L2 ranges of GLONASS. Based on the results obtained, a conclusion was made about the possibility of using the developed antenna as a single element of adaptive antenna arrays of the GLONASS system.

APA, Harvard, Vancouver, ISO, and other styles

19

Kumar, Sachin, Abhishek Sharma, Binod K. Kanaujia, Mukesh K. Khandelwal, and Anil Kumar Gautam. "Dual-band stacked circularly polarized microstrip antenna for S and C band applications." International Journal of Microwave and Wireless Technologies 8, no. 8 (April 21, 2015): 1215–22. http://dx.doi.org/10.1017/s1759078715000732.

Full text

Abstract:

A single-fed circularly polarized microstrip antenna is proposed where the antenna structure exhibits truncated corners in the radiating square patch. The truncated corners square patch structure is loaded with a circular slot and is resonating at 2.25 GHz with circular polarization. Furthermore, the proposed antenna is stacked using an upper circular patch thus achieving a dual-band circularly polarized pattern. The dual-band antenna resonates at 2.25 GHz in the first band and with impedance bandwidth ranging from 4.4 to 5.5 GHz in the second band. The size of the proposed stacked structure is compact compared with the conventional circularly polarized stacked antenna designs. Proposed structures are fabricated and fed using Subminiature version A (SMA) connector. The measured results are in good agreement with the simulated. The antenna shows stable radiation characteristics for the entire band of operation.

APA, Harvard, Vancouver, ISO, and other styles

20

Wang, Jianquan, Zhaobiao Lv, and Xinzhong Li. "Analysis of MIMO Diversity Improvement Using Circular Polarized Antenna." International Journal of Antennas and Propagation 2014 (2014): 1–9. http://dx.doi.org/10.1155/2014/570923.

Full text

Abstract:

MIMO (Multiple Input Multiple Output) technique is one of the important means to enhance the system capacity. Diversity gain could be acquired by using traditional ±45° dual-polarized antenna, but in the scenario where multipath scattering is not strong, power-unbalance in two polarizations caused by polarization mismatching between transmitting and receiving antennas will reduce diversity gain. This problem can be effectively solved by using circular polarized antennas. In this paper, through theory analysis and test, the improvement of MIMO diversity gain using circular polarization antenna is analyzed.

APA, Harvard, Vancouver, ISO, and other styles

21

Vyas, Kirti, Garima Sanyal, Arun Kumar Sharma, and Pramod Kumar Singhal. "Gain enhancement over a wideband in CPW-fed compact circular patch antenna." International Journal of Microwave and Wireless Technologies 6, no. 5 (December 13, 2013): 497–503. http://dx.doi.org/10.1017/s1759078713001037.

Full text

Abstract:

The present paper reports the gain enhancement over a wideband (12–15 GHz) in a coplanar waveguide (CPW)-fed circular patch antenna with circular defected ground structure (DGS). Two compact coplanar circular antennas have been designed and fabricated with and without DGS of same volume 18 × 20 × 1.6 mm3, built over FR4-epoxy substrate (εr = 4.4). Gain enhancement has been achieved by optimizing the current distribution with suitable DGS. For this purpose, structural designs have been optimized by parametric simulations in HFSS and CST MWS. Both the antennas can perform well in variety of wireless communication including WLAN IEEE 802.11 g/a (5.15–5.35 GHz and 5.725–5.825 GHz) and X-band applications including short range, tracking, missile guidance, and radar communication that ranges roughly from 8.29 to 11.4 GHz. The measured experimental results show that impedance bandwidth (S11 < −10 dB) of antenna with DGS is 100%. The antenna with DGS offers gain improvement by 2.7 dB for 13 GHz and 7 dB for 14 GHz. The performance of antenna with DGS is compared to conventional CPW-fed circular patch antenna (without DGS) in terms of reflection coefficient, radiation characteristics, and gain.

APA, Harvard, Vancouver, ISO, and other styles

22

Pavone, Santi Concetto, Giorgio Sebastiano Mauro, Loreto Di Donato, and Gino Sorbello. "Design of Dual Circularly Polarized Sequentially-Fed Patch Antennas for Satellite Applications." Applied Sciences 10, no. 6 (March 20, 2020): 2107. http://dx.doi.org/10.3390/app10062107.

Full text

Abstract:

In this paper, we present the design and fabrication of two dual circularly polarized (CP) patch antennas that can be profitably used as feeders for reflector systems normally adopted for satellite applications. In the first part of the manuscript, we propose the optimization of a dual-CP patch antenna, loaded by a fence of passive monopoles around it to increase antenna gain for high elevation angles. To achieve dual-CP operation mode, the circular patch has been sequentially-fed by three pins, whose mutual phase-shift is equal to 120 ∘ . The antenna feeding network was placed on the antenna back and designed using microstrip technology. Two different input ports provide both right-hand (RH) and left-hand (LH) circular polarizations. A prototype of such an antenna was fabricated and measured at f = 8 . 25 GHz. Furthermore, to test the versatility of the proposed single radiating patch, in the second part of the manuscript, we present the results of geometrically scaling at f = 2 . 2 GHz (higher UHF band) and this was used as a building block for the design of a dual-CP sequentially-fed 2-by-2 array antenna. The results for both the proposed antennas are satisfactory in terms of impedance bandwidth, broad radiation pattern, gain and cross-polarization rejection, thus they can be profitably used as feeders for reflectors at relatively low frequencies.

APA, Harvard, Vancouver, ISO, and other styles

23

Malathi, C. J., and D. Thiripurasundari. "Bandwidth Enhanced MIMO antenna for LTE bands using Split Ring Resonators and Stubs." Advanced Electromagnetics 7, no. 2 (March 1, 2018): 36–40. http://dx.doi.org/10.7716/aem.v7i2.606.

Full text

Abstract:

In this work, an array of circular patch antenna loaded with a partial split ring and a pair of stubs each with same dimensions, on each of the antenna. Patch of the radius (r) = 7.5mm. The split ring is of the width 1.35mm. the split ring not only accounts for a newer operating band, but also tend to reduce the isolation and the stubs are tends to increase the bandwidth which results in change by 44.92% compared to array of antennas without split rings. The substrate dimensions are 55´30´0.8mm3 and the ground of 55´9mm2. The proposed antennas are simulated using high frequency structural simulator and the results compared with the circular patch antenna without split ring resonators. The results obtained clearly show that, bandwidth of circular micro strip antenna without split ring can be enhanced. The proposed antennas may find applications in LTE band 1, 2, 3, 4, 7, 9, 10, 11, 15, 16, 21, 22, 23, 24, 25, 30, 33, 34, 35, 37, 38, 39, 40, 41, 42, 43 GHz covering a broadband width of 2500MHz.

APA, Harvard, Vancouver, ISO, and other styles

24

Mir, Amna, Junsheng Yu, Xiaodong Chen, and Ishtiaq Ahmad. "Numerical study of terahertz circular polarized substrate lens dipole antennas for polarization sensitive detectors." International Journal of Microwave and Wireless Technologies 8, no. 3 (March 19, 2015): 623–31. http://dx.doi.org/10.1017/s1759078715000380.

Full text

Abstract:

Wide band circular polarized (CP) antennas behind extended hemispherical lenses suitable for polarization sensitive THz detector and wireless communication have been designed and characterized using numerical simulation. Two novel, compact and CP dipole antennas are designed and studied for this purpose. CP property of planar antennas is achieved by geometrical modifications of antennas without any complicated feeding structure. Due to compact dimensions, wideband performance and CP behavior, these designs have applications in circular dichroism (CD) spectroscopy and terahertz detectors. This numerical study deals with polarization diversity with substrate lens, effect of off axis displacement on CP behavior of lens antenna which determines number of pixels for any application, far field patterns variation due to lens's internal reflection, directivity variation attributed to internal reflection and losses. Radiation efficiency variation of antenna by antenna dimensions is also studied carefully to design appropriate lens from application's point of view. Off axis performance of antenna on hemisphere lens is also studied and redesigning of antenna by some geometric modification has been carried out to improve far field patterns.

APA, Harvard, Vancouver, ISO, and other styles

25

Chaudhary, Prashant, Ashwani Kumar, and B. K. Kanaujia. "A low-profile wideband circularly polarized MIMO antenna with pattern and polarization diversity." International Journal of Microwave and Wireless Technologies 12, no. 4 (October 14, 2019): 316–22. http://dx.doi.org/10.1017/s175907871900134x.

Full text

Abstract:

AbstractThe present work describes a unique planar low-profile wideband circularly polarized Multiple-Input and Multiple-Output (MIMO) antenna operating in the X-band, with pattern and polarization diversity over the entire axial-ratio bandwidth (ARBW). The design is unique in the sense that a simple grounded stub introduced between two linearly polarized monopole antennas has been used to realize wideband circular polarization, pattern diversity, and high isolation between antennas. The ARBW of the MIMO antenna is 2.45 GHz (8.11–10.56) 3 dB and its impedance matching bandwidth is 3.52 GHz (8.07–11.59). The isolation is better than 20 dB. The antenna can be easily adapted to operate other frequency bands by simple frequency scaling. It has been fabricated on an FR-4 substrate and its performance has been compared against several existing available antennas.

APA, Harvard, Vancouver, ISO, and other styles

26

Le, Minh Thuy, Quoc Cuong Nguyen, and Tan Phu Vuong. "Design of High-Gain and Beam Steering Antennas Using a New Planar Folded-Line Metamaterial Structure." International Journal of Antennas and Propagation 2014 (2014): 1–16. http://dx.doi.org/10.1155/2014/302580.

Full text

Abstract:

In the last few years, there has been growing interest in employing metamaterials (MTMs) to enhance antenna gain. In this paper we proposed a novel structure of planar folded-line left-handed metamaterial (FL-LHM) and applied it to improve the gain of three 5.8 GHz microstrip antenna types: a circularly polarized patch antenna, an antenna array, and a beam steering antenna. The planar FL-LHM structure was designed based on transmission line analysis. Their scattering parameters were obtained using a numerical model; the negative effective permittivity and permeability were then calculated from these parameters for the assessment of negative refraction index region. The S11and radiation patterns of three fabricated antennas were measured; these results matched well with the simulation. We observed that the gain was increased up to 3 dBi for all the antennas. In addition, we were also able to maintain the circular polarization as well as the steering of the antenna without changing its dimensions.

APA, Harvard, Vancouver, ISO, and other styles

27

Xing, Zijian, Ling Wang, Jianying Li, and Kun Wei. "Radiation Efficiency Improvement Method for Multifeed Circular Polarization Antenna Array with Mutual Coupling Effect." International Journal of Antennas and Propagation 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/241846.

Full text

Abstract:

In the circular polarization antenna array, the input impedance, axial ratio, and radiation pattern of antenna patch will be changed. Compared with the performances of single antenna, the mutual coupling also led to the low efficiency of all antennas. A novel radiation efficiency elevation method of multifeed circular polarization (CP) antenna array is demonstrated in this paper, in order to solve the problem. To prove the concept of novel method, dual-feed antenna with stubs is developed and fabricated. According to the measured results, each antenna would increase in efficiency by approximate 1dB by applying this novel design method. Therefore, this paper provides dramatically useful results of lessening the negative effect resulting in mutual coupling.

APA, Harvard, Vancouver, ISO, and other styles

28

Joseph, Ronald, and Takeshi Fukusako. "CIRCULARLY POLARIZED BROADBAND ANTENNA WITH CIRCULAR SLOT ON CIRCULAR GROUNDPLANE." Progress In Electromagnetics Research C 26 (2012): 205–17. http://dx.doi.org/10.2528/pierc11110810.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Parihar, Manoj S., Ananjan Basu, and Shiban K. Koul. "Transient analysis of reconfigurable polarization antenna." International Journal of Microwave and Wireless Technologies 5, no. 4 (February 18, 2013): 521–27. http://dx.doi.org/10.1017/s175907871300007x.

Full text

Abstract:

Time-domain characterization of a microstrip patch antenna with circular corner truncation to achieve polarization reconfigurability is presented. By applying zero bias, forward bias, and reverse bias to the four PIN diodes, the antenna can radiate with linear polarization (LP), right hand circular polarization (RHCP), and left hand circular polarization (LHCP). The circular cuts reduce centre-frequency shift from linear to circularly polarized states, compared with conventional straight cuts. Time-domain simulation and measurement are carried out to show the switching characteristics of the proposed antenna, and it is established that satisfactory switching speed can be obtained using a simple low-cost driver circuit.

APA, Harvard, Vancouver, ISO, and other styles

30

Li, Rongqiang, and Shaoqiu Xiao. "Dual-Resonant Implantable Circular Patch Antenna for Biotelemetry Communication." International Journal of Antennas and Propagation 2016 (2016): 1–5. http://dx.doi.org/10.1155/2016/5262013.

Full text

Abstract:

A compact broadband implantable circular patch antenna is designed and experimentally demonstrated for Medical Implant Communications Service (MICS) band (402–405 MHz). Compared with other similar implantable antennas, the proposed antenna incorporates three advantages for biotelemetry communication. First, it can realize a broad impedance bandwidth by exhibiting dual resonances. Second, it can obtain a compact structure by introducing two arc-shaped slots, a rectangular slot and a circular slot on metal radiating patch. Finally, it can display a friendly shape by using a circular structure. The proposed antenna occupies a volume of about 431.5 mm3(10.42× 1.27π mm3), which is a compromise between miniaturization and bandwidth. The measured −10 dB impedance bandwidth is 55 MHz (385–440 MHz). Furthermore, the radiation performance and human body safety consideration of the antenna are examined and characterized.

APA, Harvard, Vancouver, ISO, and other styles

31

Khalifa, Taher, N. M. Sahar, N. Ramli, and M. T. Islam. "Circularly polarized microstrip patch antenna array for GPS application." Indonesian Journal of Electrical Engineering and Computer Science 15, no. 2 (August 1, 2019): 920. http://dx.doi.org/10.11591/ijeecs.v15.i2.pp920-926.

Full text

Abstract:

<span>The 12 elements antenna array for GPS system having high gain with circular polarization is presented in this paper. The circularly polarized antenna is very suitable for the use of various wireless systems such as Global Positioning System with operating frequency is 1.27 GHz with AR is less than 3 dB between 82˚ and 140˚.The antenna consists of twelve main radiation patches connected in parallel. The antennas array are designed on the Rogers RT5880 substrate with a dielectric constant (εr) of 2.2 and thickness is 0.787 mm. The antenna is excited with an inset feed line and it operates in L-band with a resonant frequency of 1.27 GHz.</span>

APA, Harvard, Vancouver, ISO, and other styles

32

Kim, Dang-Oh, Che-Young Kim, and Dae-Geun Yang. "Flexible Hilbert-Curve Loop Antenna Having a Triple-Band and Omnidirectional Pattern for WLAN/WiMAX Applications." International Journal of Antennas and Propagation 2012 (2012): 1–9. http://dx.doi.org/10.1155/2012/687256.

Full text

Abstract:

A triple-band flexible loop antenna is proposed for WLAN/WiMAX applications in this paper. The proposed antenna is formed by the third-order Hilbert-curve and bending type structure which provides flexible characteristics. Even though the radius of the curvature for bending antennas is changed, a triple-band feature still remains in the proposed antenna. Moreover, the antenna exhibits the characteristics of omnidirectional radiation pattern and circular polarization. To verify the receiving performance of antenna, a simulation on the antenna factor was conducted by an EM simulator. Based on these results, the suggested antenna makes a noteworthy performance over typical loop antennas.

APA, Harvard, Vancouver, ISO, and other styles

33

Chowdhury, Mehdi Hasan, Quazi Delwar Hossain, Md Azad Hossain, and Ray Chak Chung Cheung. "Single feed circularly polarized crescent-cut and extended corner square microstrip antennas for wireless biotelemetry." International Journal of Electrical and Computer Engineering (IJECE) 9, no. 3 (June 1, 2019): 1902. http://dx.doi.org/10.11591/ijece.v9i3.pp1902-1909.

Full text

Abstract:

<p>In this paper, the development of two novel circularly polarized microstrip antennas is thoroughly explained. These antennas are fed by coaxial feeding technique. One of the primary objectives of the proposed work is to tune the antennas to work in ISM band. This frequency band refers to the internationally recognized radio frequency bandwidth which is to be used explicitly for Industrial, Scientific, and Medical applications. Therefore, these antennas would be suitable to use in the field of wireless biotelemetry. Two new antenna design techniques have been introduced to produce circular polarization, and details of these schemes are described. The proposed microstrip antennas are designed and simulated on Advanced Design System (ADS) software. The return loss of the proposed crescent-cut antenna is -19.3 dB at the operating frequency. The extended corner antenna has the return loss of -29.3 dB at the tuned frequency. The simulation results are also presented and discussed.</p>

APA, Harvard, Vancouver, ISO, and other styles

34

Alam, Syah, Eddy Wijanto, Budi Harsono, Fidelia Samandatu, Markus Upa, and Indra Surjati. "Design Of Array and Circular Polarization Microstrip Antenna For LTE Communication." MATEC Web of Conferences 218 (2018): 03006. http://dx.doi.org/10.1051/matecconf/201821803006.

Full text

Abstract:

This paper proposes a high gain microstrip antenna with circular polarization for LTE applications at a working frequency of 2300 MHz. Gain of antenna is optimized by using an array method with 4 elements arranged in plannar using feed line of 50 Ohm, 100 Ohm and 70.7 Ohm. The proposed antenna designed using FR-4 substrate with (ɛr) = 4.3, substrate thickness (h) of 1.6 mm and loss tangent (tan δ) of 0.0265. Gain of antenna can be optimized by increasing the number of elements in the array of the antenna. Circular polarization can be obtained by cutting the edge of a rectangular patch antenna with an angle of 45° . From the simulation results obtained reflection coefficient value of -20.02 dB and VSWR of 1.22 at the working frequency of 2300 MHz. The gain of proposed microstrip antenna is 10.56 dB with an impedance bandwidth value of 714 MHz (1925 - 2639 MHz). The proposed antenna obtained a circular polarization with axial ratio of 1.745 dB at working frequency of 2300 MHz. Array method with four elements increased the gain of antena until 45.07% compared to the single element antenna.

APA, Harvard, Vancouver, ISO, and other styles

35

Vavrík, Ferdinand, and Jozef Hallon. "Frequency shift of the minimal magnitude of reflection coefficient in antenna array." Journal of Electrical Engineering 70, no. 1 (February 1, 2019): 64–68. http://dx.doi.org/10.2478/jee-2019-0009.

Full text

Abstract:

Abstract The paper present a study of frequency shift of the reflection coefficient minimal absolute value dependence on antenna spacing in linear and circular arrays. The spacing of CB-band monopole antenna was in the range of 0.015 to 0.12 multiples of the antenna working wavelength. Number of elements in the antenna arrays ranged from two to four. Frequency dependence of minimal absolute value of the reflection coefficient was obtained by simulations and also experimentally confirmed in anechoic chamber. The research showed two facts. First, mutual impedance has the higher impact when antenna spacing is comparable with the reactive near field region. Second, circular antenna arrays are a better choice in applications for a small number of antennas with that spacing.

APA, Harvard, Vancouver, ISO, and other styles

36

Alizadeh, Farzad, Changiz Ghobadi, Javad Nourinia, Mahdi Dadashi, and Rahim Barzegari. "A design of ring-shaped dual-band/multi-band circularly polarized microstrip antenna based on slots mutual coupling." International Journal of Microwave and Wireless Technologies 8, no. 2 (January 14, 2015): 291–99. http://dx.doi.org/10.1017/s1759078714001585.

Full text

Abstract:

A new approach for designing a single-feed circular microstrip antenna with dual-band/multi-band circularly polarized (CP) radiation are demonstrated and studied experimentally. It is presented that by embedding pairs of asymmetrical ring-shaped arc slots to the boundary of both circular patch and the ground plane the impedance bandwidth of the antenna increases. This can be achieved by making use of both mutual coupling between the resonances of the ring-shaped arc slots and the fundamental resonances of the circular antenna. Also, by extending the ring-shaped arc slots out with narrow slots, the circular microstrip patch antenna can perform dual-band/multi-band CP radiation. Further details of the proposed CP microstrip antenna designs are described, and typical experimental results are presented and discussed.

APA, Harvard, Vancouver, ISO, and other styles

37

Rahayu, Yusnita, Kurnia Alfikri, and Rhendy Theopilus Silalahi. "PERANCANGAN ANTENA DENGAN CIRCULAR LINE PATCH DAN THICK LINE UNTUK LTE FREKUENSI 1.8 GHZ." SINERGI 21, no. 1 (March 1, 2017): 59. http://dx.doi.org/10.22441/sinergi.2017.1.009.

Full text

Abstract:

Antena Circular line patch memiliki bentuk patch circular dan antena Thick line memiliki patch rectangular. Kedua antena ini mampu bekerja secara optimal pada frekuensi 1.8 GHz. Software CST digunakan dalam perancangan dua antena ini dan dilakukan beberapa kali pengkarakterisasian. Untuk antenna circular line patch, didapat hasilnya yaitu pada frekuensi kerja 1.8 GHz dengan return loss -24.36 dB, bandwidth 160 MHz, dan gain 2.457 dBi. Antena thick line patch dan circular slot, didapat hasilnya yaitu pada frekuensi 1.8 GHz dengan return loss -26.493 dB, bandwidth 213 MHz, dan gain 2.26 dBi.

APA, Harvard, Vancouver, ISO, and other styles

38

Tam, M. T. K., and R. D. Murch. "Circularly polarized circular sector dielectric resonator antenna." IEEE Transactions on Antennas and Propagation 48, no. 1 (2000): 126–28. http://dx.doi.org/10.1109/8.827396.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Surducan, E., V. Surducan, D. Iancu, and J. Glossner. "Multiband Antennas for SDR Applications." International Journal of Digital Multimedia Broadcasting 2009 (2009): 1–9. http://dx.doi.org/10.1155/2009/460143.

Full text

Abstract:

We present multiband antennas configurations for SDR applications. Using a composite folded dipole structure as starting point, we derived more complex antenna configurations to support multiple communication protocols for mobile application with linear and circular polarizations. Prototypes as single antenna with circular polarization, tunable single antenna with PIN diode and MIMO systems with three and four antennas, all derivatives of the same basic structure, were produced in an iterative fashion until the desired parameters were achieved. These antennas are suitable for microstrip circuit realizations and can be included in the printed circuit board (PCB) of the device, or used as stand alone. The shapes and measurement results are presented throughout the paper. From the illustrated graphs it can be seen that the stand-alone antennas exhibit positive gain for all the frequency bands of interest while the separation between antennas, for the multiple-input multiple-output (MIMO) case, is better than 15 dB.

APA, Harvard, Vancouver, ISO, and other styles

40

Nurhayati, Nurhayati, Paulen Aulia Lutfia, Raimundo Eider Figueredo Sobrinho, Alexandre Manicoba De Oliveira, João Francisco Justo Filho, and Takeshi Fukusako. "Circular Polarization of the Square, Circular, Triangle, and Hexagonal Microstrip Antenna." INAJEEE Indonesian Journal of Electrical and Eletronics Engineering 3, no. 1 (February 26, 2020): 5. http://dx.doi.org/10.26740/inajeee.v3n1.p5-9.

Full text

Abstract:

Microstrip antenna with circular polarization can be applied for many applications. Some microstrip antenna with square, circular, triangular, and hexagonal shape has been designed to get return loss, axial ratio, and radiation performance. We compare twelve microstrip antenna by maintaining its substrate dimension, feeding shape, and outer patch dimension. Even though antenna has a circular patch, it doesn’t always produce circular polarization. From the simulation, we found that with add some structure, the antenna can reach multiband resonance from 1 to 6 GHz. The Circular patch antenna reached seven numbers of the multiband resonance frequency. The hexagonal patch antenna reaches the highest directivity as 9.53 dBi. The circular polarization is achieved for a square and Hexagonal patch shape with axial ratio value is 1.96 dB at 4 GHz and 1.26 dB at 4.1 GHz sequentially at phi 900 and theta 900.

APA, Harvard, Vancouver, ISO, and other styles

41

Rizki, Abdurrahman, Alloysius Adya Pramudita, and Trasma Yunita. "PENGARUH PENYUSUNAN POLARISASI PADA SISTEM ANTENA MIMO TERHADAP KAPASITAS KANAL." TEKTRIKA - Jurnal Penelitian dan Pengembangan Telekomunikasi, Kendali, Komputer, Elektrik, dan Elektronika 5, no. 1 (September 14, 2020): 13. http://dx.doi.org/10.25124/tektrika.v5i1.3240.

Full text

Abstract:

Multiple Input Multiple Output (MIMO) system is a technology that has the potential to be developed to increase channel capacity. The increase in channel capacity in the MIMO system is not only determined by the number of antennas, but is determined by the characteristics and arrangement of the antenna concept. This study identifies the effect of circular polarization on the MIMO antenna system on channel capacity. Co-polarization consists of a Left Hand Circular Polarization (LHCP) and Right Hand Circular Polarization (RHCP) configuration, while cross-polarization consists of an RHCP-LHCP configuration. The co-polarization of the antenna with the LHCP configuration results in an estimated channel capacity of 11,578 bps / Hz when it is at the lowest Signal to Noise Ratio (SNR) is 5 dB

APA, Harvard, Vancouver, ISO, and other styles

42

Hamidah Abd Hamid, Saidatul, Goh Chin Hock, and M. T. Ali. "Analysis of Performance on Circular Patch Antenna Based on Different Feeding Techniques." International Journal of Engineering & Technology 7, no. 4.1 (September 12, 2018): 81. http://dx.doi.org/10.14419/ijet.v7i4.1.28230.

Full text

Abstract:

This paper presents a simulation and analysis of a circular patch antenna with different feeding techniques. The objectives of this analysis are to design the microstrip circular patch antennas using five types of feedings techniques which are stepped feed, inset feed, coaxial feed, aperture coupled feed, and proximity feed, to analyze and compares the performance of the antenna design. Performance characteristics of the antenna such as return loss S11 parameter <-10dB, directivity, gain, bandwidth, side lobe level, beam width, and voltage standing wave ratio (VSWR) parameters of each of the feeding methods designs are obtained and compared.

APA, Harvard, Vancouver, ISO, and other styles

43

Chen, Yao, Longfang Ye, Jianliang Zhuo, Yanhui Liu, Liang Zhang, Miao Zhang, and Qing Huo Liu. "Frequency Reconfigurable Circular Patch Antenna with an Arc-Shaped Slot Ground Controlled by PIN Diodes." International Journal of Antennas and Propagation 2017 (2017): 1–7. http://dx.doi.org/10.1155/2017/7081978.

Full text

Abstract:

In this paper, a compact frequency reconfigurable circular patch antenna with an arc-shaped slot loaded in the ground layer is proposed for multiband wireless communication applications. By controlling the ON/OFF states of the five PIN diodes mounted on the arc-shaped slot, the effective length of the arc-shaped slot and the effective length of antennas current are changed, and accordingly six-frequency band reconfiguration can be achieved. The simulated and measured results show that the antenna can operate from 1.82 GHz to 2.46 GHz, which is located in DCS1800 (1.71–1.88 GHz), UMTS (2.11–2.20 GHz), WiBro (2.3–2.4 GHz), and Bluetooth (2.4–2.48 GHz) frequency bands and so forth. Compared to the common rectangular slot circular patch antenna, the proposed arc-shaped slot circular patch antenna not only has a better rotational symmetry with the circular patch and substrate but also has more compact size. For the given operating frequency at 1.82 GHz, over 55% area reduction is achieved in this design with respect to the common design with rectangular slot. Since the promising frequency reconfiguration, this antenna may have potential applications in modern multiband and multifunctional mobile communication systems.

APA, Harvard, Vancouver, ISO, and other styles

44

Kim, Donghyuk, Daniel Hernandez, and Kyoung-Nam Kim. "Design of a Dual-Purpose Patch Antenna for Magnetic Resonance Imaging and Induced RF Heating for Small Animal Hyperthermia." Applied Sciences 11, no. 16 (August 8, 2021): 7290. http://dx.doi.org/10.3390/app11167290.

Full text

Abstract:

The popularity of patch antennas in magnetic resonance imaging (MRI) has reduced because of the large size required for patch antennae to resonate. Since the size of the patch antenna is associated with the wavelength and the wavelengths that are used in MRI are substantially large, large antennas are used. Methods of reducing patch antenna sizes have been proposed; however, these methods reduce the penetration depth and uniformity. In this study, we reduced the area of the patch antenna by 30% by folding the ground and patch planes in a zigzag pattern. The patch antenna produced two main resonant modes. The first mode produced a uniform magnetic field that was used for MRI. The second mode produced a strong and focused electric (|E|)-field, which was used for radiofrequency (RF) heating. Furthermore, we explored the use of a combination of two patch antennas aligned along the z-axis to provide a circular uniform magnetic flux density (|B1|) field at 300 MHz, which corresponds to the Larmor frequency in the 7T MRI system. In addition, the patch antenna configuration will be used for RF heating hyperthermia operating at 1.06 GHz. The target object was a small rat with insertion of colon cancer. Using the proposed configuration, we achieved |B1|-field uniformity with a standard deviation of 3% and a temperature increment of 1 °C in the mimic cancer tissue.

APA, Harvard, Vancouver, ISO, and other styles

45

Sundar, P. Syam, Sarat K Kotamraju, B. T. P. Madhav, M. Sreehari, K. Raghavendra Rao, L. Prathyusha, and Y. Pravallika. "Parasitic Strip Loaded Dual Band Notch Circular Monopole Antenna with Defected Ground Structure." International Journal of Electrical and Computer Engineering (IJECE) 6, no. 4 (August 1, 2016): 1742. http://dx.doi.org/10.11591/ijece.v6i4.10529.

Full text

Abstract:

In this article a parasitic strip loaded monopole antennas are designed to notch dual and triple bands. The designed models are constructed on one side of the substrate material and on the other end defected ground structures are implemented. The basic antenna comprises a tuning stub and a ground plane with tapered shape slot as DGS. Another model is constructed with circular monopole radiating element on front side and similar kind of ground structure used in the basic rectangular tuning stub antenna. To create notched bands with tuning stubs, two symmetrical parasitic slits are placed inside the slot of the ground plane. The basic model is of the rectangular stub notching triple band and the circular tuning stub antenna notching dual band. Dual band notched circular tuning stub antenna is prototyped on FR4 substrate and measured results from vector network analyzer are compared with simulation results of HFSS for validation.

APA, Harvard, Vancouver, ISO, and other styles

46

Sundar, P. Syam, Sarat K Kotamraju, B. T. P. Madhav, M. Sreehari, K. Raghavendra Rao, L. Prathyusha, and Y. Pravallika. "Parasitic Strip Loaded Dual Band Notch Circular Monopole Antenna with Defected Ground Structure." International Journal of Electrical and Computer Engineering (IJECE) 6, no. 4 (August 1, 2016): 1742. http://dx.doi.org/10.11591/ijece.v6i4.pp1742-1750.

Full text

Abstract:

In this article a parasitic strip loaded monopole antennas are designed to notch dual and triple bands. The designed models are constructed on one side of the substrate material and on the other end defected ground structures are implemented. The basic antenna comprises a tuning stub and a ground plane with tapered shape slot as DGS. Another model is constructed with circular monopole radiating element on front side and similar kind of ground structure used in the basic rectangular tuning stub antenna. To create notched bands with tuning stubs, two symmetrical parasitic slits are placed inside the slot of the ground plane. The basic model is of the rectangular stub notching triple band and the circular tuning stub antenna notching dual band. Dual band notched circular tuning stub antenna is prototyped on FR4 substrate and measured results from vector network analyzer are compared with simulation results of HFSS for validation.

APA, Harvard, Vancouver, ISO, and other styles

47

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

48

Rajni, Rajni, Gursharan Kaur, and Anupma Marwaha. "Metamaterial Inspired Patch Antenna for ISM Band by Adding Single-Layer Complementary Split Ring Resonators." International Journal of Electrical and Computer Engineering (IJECE) 5, no. 6 (December 1, 2015): 1328. http://dx.doi.org/10.11591/ijece.v5i6.pp1328-1335.

Full text

Abstract:

In this work, we propose the design of metamaterial inspired compact circular patch antennas loaded with complementary split-ring resonators (CSRRs) for ISM band operation. CSRRs have been incorporated horizontally inside the dielectric. The various models of CSRR loaded antennas with different patch radius are produced and are evaluated numerically with Ansoft HFSS software. The results of the suggested antenna designs are presented that reveal a comparable impedance match and radiation characteristics with those of a normal patch antenna without CSRR. The proposed antennas yield high levels of miniaturization and similar performance to the conventional patch antenna at the 2.45GHz.

APA, Harvard, Vancouver, ISO, and other styles

49

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.

Full text

Abstract:

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.

APA, Harvard, Vancouver, ISO, and other styles

50

Yeo, Junho, and Jong-Ig Lee. "UWB Circular Loop Antenna with Circular Sectors." Journal of the Korea Institute of Information and Communication Engineering 18, no. 12 (December 31, 2014): 2816–22. http://dx.doi.org/10.6109/jkiice.2014.18.12.2816.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Circular antenna'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles