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Thematische Bibliographien / Aperture antennas / Zeitschriftenartikel

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Zeitschriftenartikel zum Thema „Aperture antennas“

Autor: Grafiati

Veröffentlicht am 4. Juni 2021

Zuletzt aktualisiert am 20. Februar 2023

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1

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.

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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.

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Musa, Doaa Salim Mohammed, Ramazan Daşbaşı, and Burak Polat. "Evaluation of Radiation Performances of Various Aperture and Horn Antennas over Sea Surface." European Journal of Research and Development 2, no. 2 (June 7, 2022): 429–44. http://dx.doi.org/10.56038/ejrnd.v2i2.89.

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Directional Currents Method (DCM) is applied to various aperture and horn antennas including rectangular aperture antenna, circular aperture antenna, dielectric loaded rectangular aperture antenna and E- and H-plane sectoral horn antennas to investigate their radiation performances analytically over sea surface in microwave bands. First, the expressions of the hypothetical directional currents of these antennas are derived in free space and the total radiation patterns are generated by MATLABTM. Then, the same antennas are simulated by the commercial electromagnetic simulation software CSTTM a

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Pang, Ke, Yongjun Xie, Legen Dai, and Peiyu Wu. "Design of Ultra High Aperture Efficiency Surface Wave Antenna Array Based on the Three-Dimensional Aperture Principle." Electronics 11, no. 21 (October 28, 2022): 3515. http://dx.doi.org/10.3390/electronics11213515.

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To overcome the conflict between limited space and the requirement for high gain antennas, a novel high aperture efficiency antenna array consisting of surface wave end-fire antennas is proposed based on the three-dimensional aperture principle. By introducing longitudinal dimension into the calculation of the regular aperture antenna gain, the two-dimensional aperture principle is expanded into the three-dimensional aperture principle. Meanwhile, the directivity and gain of the array could increase without increasing the aperture area. The aperture efficiency of the array could be more than 1

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Qu, Bingyue, Sen Yan, Anxue Zhang, Yongqiang Pang, and Zhuo Xu. "Shared-aperture antennas based on mode modulation of a patch antenna and spoof surface plasmon polaritons." Journal of Physics D: Applied Physics 55, no. 4 (October 25, 2021): 045002. http://dx.doi.org/10.1088/1361-6463/ac2f69.

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Abstract Light-weight shared-aperture antennas require the integration of multiple functions in separate frequency bands within the same physical aperture, having great potential use in remote sensing, radiometers, telemetry and communication, etc. In this letter, a method for designing light-weight shared-aperture antennas based on engineering of spoof surface plasmon polaritons (SSPPs) is presented. The proposed antenna consists of a feeding patch and a SSPP structure. Even and odd modes can be excited in different bands to realize different radiation performances. The simulated and measured

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Wang, Congsi, Haihua Li, Kang Ying, Qian Xu, Na Wang, Baoyan Duan, Wei Gao, Lan Xiao, and Yuhu Duan. "Active Surface Compensation for Large Radio Telescope Antennas." International Journal of Antennas and Propagation 2018 (2018): 1–17. http://dx.doi.org/10.1155/2018/3903412.

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With the development of radio telescope antennas with large apertures, high gain, and wide frequency bands, compensation methods, such as mechanical or electronic compensation, are obviously essential to ensure the electrical performance of antennas that work in complex environments. Since traditional compensation methods can only adjust antenna pointing but not the surface accuracy, which are limited for obtaining high surface precision and aperture efficiency, active surface adjustment has become an indispensable tool in this field. Therefore, the development process of electrical performanc

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Ding, Kaicheng, Lei Sun, and Daqun Yu. "A Dual-Band Shared-Aperture Antenna Array Design." Journal of Physics: Conference Series 2419, no. 1 (January 1, 2023): 012034. http://dx.doi.org/10.1088/1742-6596/2419/1/012034.

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Abstract Aiming at solving the difficult problem of shared-aperture integration of dual-band antenna arrays, the research of P-band/S-band shared-aperture antenna arrays is carried out, focusing on the design of broadband wide-angle scanning, planarization, miniaturization, and low-profile of the two-band shared-aperture antenna arrays. And certain work is carried out for the shared-aperture antennas in terms of the improvement of isolation and suppression of the blocking effect. The simulation results of the antenna model show that this antenna works well and can meet the specification requir

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Washington, Gregory. "Smart aperture antennas." Smart Materials and Structures 5, no. 6 (December 1, 1996): 801–5. http://dx.doi.org/10.1088/0964-1726/5/6/010.

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Xue, Yulong, Qihao Zhang, Yangming Ren, Yufang Lei, Xiaochen Sun, and Lingxuan Zhang. "Two-dimensional single-lobe Si photonic optical phased array with minimal antennas using a non-uniform large spacing array design." Applied Optics 61, no. 24 (August 15, 2022): 7158. http://dx.doi.org/10.1364/ao.463542.

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We report a two-dimensional Si photonic optical phased array (OPA) optimized for a large optical aperture with a minimal number of antennas while maintaining single-lobe far field. The OPA chip has an optical aperture of ∼ 200 µ m by 150 µm comprising a 9 × 9 antenna array. The two-dimensional spacings between these antennas are much larger than the wavelength and are highly non-uniform optimized by the genetic deep learning algorithm. The phase of each antenna is independently tunable by a thermo-optical phase shifter. The experimental results validate the design and exhibit a 0.39 ∘ × 0.41 ∘

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Ilnitskyi, Ludvig, Leonid Sibruk, and Inna Mykhalchuk. "Considerations for Far-field Antennas Test." Electronics and Control Systems 2, no. 68 (November 22, 2021): 56–61. http://dx.doi.org/10.18372/1990-5548.68.16092.

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The theoretical foundations of testing antenna parameters and characteristics in the far radiation field are presented. A two-beam model of radio wave propagation was used, including a direct wave and a wave reflected from the earth's surface. This model meets the conditions for carrying out measurements on a signals training areas or in an anechoic chamber. It is shown that for a given distance between the antennas, it is necessary to control the dimensions of the aperture transmitting and receiving antennas for the compliance with the maximum permissible values. Formulas for determining the

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Gu, Chunwang, Hao Liu, and Min Yi. "Lightweight Fan-Beam Microstrip Grid Antenna for Airborne Microwave Interferometric Radiometer Applications." Micromachines 14, no. 1 (January 15, 2023): 228. http://dx.doi.org/10.3390/mi14010228.

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The microwave interferometric radiometer (MIR) uses aperture synthesis technology to equate multiple small-aperture antennas into a large-aperture antenna to improve spatial resolution. At present, MIR antennas that operate at frequencies above the C-band mostly use horn antennas, waveguide slot antennas, etc., which have the disadvantages of a high profile and large mass. In this paper, a new type of miniaturized, low-profile, and lightweight K-band fan-beam microstrip grid antenna is designed for the airborne campaign of the K-band one-dimensional MIR of a Microwave Imager Combined Active an

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Moheb, H., J. Shaker, and L. Shafai. "Numerical and experimental investigation of cavity-backed arbitrary slot antennas." Canadian Journal of Physics 74, no. 3-4 (March 1, 1996): 122–31. http://dx.doi.org/10.1139/p96-019.

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The equivalence principle and the generalized network formulation are used to model the tangential electric field on arbitrary apertures, backed by a rectangular wave guide or cavity, in terms of equivalent magnetic currents. The coupling is through the aperture whose characteristics are expressed by the aperture admittance matrices of the cavity and half-space regions. The aperture coupling is then expressed as the sum of the two independent aperture admittances, with source terms related to the incident field. The result is an integral equation for the unknown aperture current. This integral

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Teniou, Mounir, Helene Roussel, Mohammed Serhir, Nicolas Capet, Gerard-Pascal Piau, and Massimiliano Casaletti. "Tensorial metasurface antennas radiating polarized beams based on aperture field implementation." International Journal of Microwave and Wireless Technologies 10, no. 2 (November 23, 2017): 161–68. http://dx.doi.org/10.1017/s1759078717001222.

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This paper presents a procedure for the design of tensorial metasurface antennas radiating polarized beams through aperture field synthesis. The aperture field is generated using the surface wave to leaky wave conversion resulting from metasurface modulation. The design procedure of the feeder is presented with a description of the geometrical parameters affecting the antenna matching. Numerical solutions for single beam and multi-beam metasurface antennas working respectively, at 12.25 and 20 GHz are presented. In addition, a metasurface prototype working at 12.25 GHz is manufactured and meas

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Reichthalhammer, T., and E. Biebl. "Motion compensation of short-range, wide-beam synthetic aperture radar." Advances in Radio Science 9 (July 29, 2011): 61–66. http://dx.doi.org/10.5194/ars-9-61-2011.

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Abstract. Up to now, SAR systems are a well known possibility for long-range detection. Applying them for short-range applications with wide-beam antennas, of course, does not increase the resolution but the probability to detect hidden targets with an anisotropic radar cross section significantly in comparison to other detection systems. Working with an appropriate wavelength even improves the possiblity to look through natural cover like grass. An application is detecting fawn while pasture mowing. The main issue in such applications is the antenna's motion in range direction as it is carrie

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Isakov, V. N., and V. S. Lankina. "Modeling of the electromagnetic field of radiating aperture." Russian Technological Journal 9, no. 4 (August 26, 2021): 56–67. http://dx.doi.org/10.32362/2500-316x-2021-9-4-56-67.

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The article is devoted to the issues of numerical calculation of the characteristics of the electromagnetic field of radiating apertures. Тhe radiating aperture is a universal electrodynamic model used in the analysis of a special class of antennas, in particular, mirror and horn antennas, in the study of diffraction phenomena, in the planning of radio wave propagation paths, and when solving problems of wireless transmission of electric energy at a distance. The structure of the electromagnetic field of a radiating aperture in the intermediate and far zones is of the greatest interest accordi

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Ohnimus, Florian, Uwe Maaß, Gerhard Fotheringham, Brian Curran, Ivan Ndip, Thomas Fritzsch, Jürgen Wolf, Stephan Guttowski, and Klaus-Dieter Lang. "Design and Comparison of 24 GHz Patch Antennas on Glass Substrates for Compact Wireless Sensor Nodes." International Journal of Microwave Science and Technology 2010 (February 7, 2010): 1–9. http://dx.doi.org/10.1155/2010/535307.

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Three patch antennas suitable for integration and operation in a compact 24 GHz wireless sensor node with radar and communication functions are designed, characterized, and compared. The antennas are manufactured on a low loss glass wafer using thin film (BCB/Cu) wafer level processing (WLP) technologies. This process is well suited for 3D stacking. The antennas are fed through a microstrip line underneath a ground plane coupling into the patch resonator through a slot aperture. Linear polarization (LP), dual mode (DM) operation, and circular polarization (CP) are achieved through the layout o

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Lukin, Konstantin, Anatoliy Mogila, Pavlo Vyplavin, Gaspare Galati, and Gabriele Pavan. "Novel concepts for surface movement radar design." International Journal of Microwave and Wireless Technologies 1, no. 3 (June 2009): 163–69. http://dx.doi.org/10.1017/s1759078709000233.

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Traditional millimeter-wave surface movement radar (SMR) has been designed and tested. A novel concept for the design of a new SMR is suggested based on synthetic aperture antenna and noise radar technology. It enables designing SMR without mechanical rotation of an antenna, but applying several nonmoving synthetic aperture antennas instead. Application of noise radar technology is also considered in more detail to improve the expected performance of a new SMR.

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Kumar, Girish, and R. K. Kotapati. "Aperture Coupled Microstrip Antennas." IETE Technical Review 16, no. 1 (January 1999): 85–88. http://dx.doi.org/10.1080/02564602.1999.11416808.

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Kim, Eunhee, Ilkyu Kim, and Wansik Kim. "Non-Uniform MIMO Array Design for Radar Systems Using Multi-Channel Transceivers." Remote Sensing 15, no. 1 (December 23, 2022): 78. http://dx.doi.org/10.3390/rs15010078.

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Multiple-input multiple-output (MIMO) technology has recently attracted attention with regard to improving the angular resolution of small antennas such as automotive radars. If appropriately placed, the co-located transmit and receive arrays can make a large virtual aperture. This paper proposes a new method for designing arrays by adopting a structure with minimum redundancy. The proposed structure can significantly increase the virtual array aperture while keeping the transmit and receive antennas at the same size. We describe the application of the proposed method to subarray-type antennas

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Karami, Farzad, Halim Boutayeb, Ali Amn-e-Elahi, Alireza Ghayekhloo, and Larbi Talbi. "Developing Broadband Microstrip Patch Antennas Fed by SIW Feeding Network for Spatially Low Cross-Polarization Situation." Sensors 22, no. 9 (April 24, 2022): 3268. http://dx.doi.org/10.3390/s22093268.

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A stacked multi-layer substrate integrated waveguide (SIW) microstrip patch antenna with broadband operating bandwidth and low cross-polarization radiation is provided. A complete study on the propagating element bandwidth and cross polarization level is presented to demonstrate the importance of the design. The proposed antenna includes three stacked printed circuit board (PCB) layers, including one layer for the radiating 2 × 2 rectangular patch elements and two SIW PCB layers for the feeding network. There are two common methods for excitation in cavity-backed patch antennas: probe feeding

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Karami, Farzad, Halim Boutayeb, Ali Amn-e-Elahi, Alireza Ghayekhloo, and Larbi Talbi. "Developing Broadband Microstrip Patch Antennas Fed by SIW Feeding Network for Spatially Low Cross-Polarization Situation." Sensors 22, no. 9 (April 24, 2022): 3268. http://dx.doi.org/10.3390/s22093268.

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A stacked multi-layer substrate integrated waveguide (SIW) microstrip patch antenna with broadband operating bandwidth and low cross-polarization radiation is provided. A complete study on the propagating element bandwidth and cross polarization level is presented to demonstrate the importance of the design. The proposed antenna includes three stacked printed circuit board (PCB) layers, including one layer for the radiating 2 × 2 rectangular patch elements and two SIW PCB layers for the feeding network. There are two common methods for excitation in cavity-backed patch antennas: probe feeding

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Tkachenko, Sergey, Jürgen Nitsch, and Moawia Al-Hamid. "High-Frequency Electromagnetic Field Coupling to Small Antennae in a Rectangular Resonator." International Journal of Antennas and Propagation 2012 (2012): 1–6. http://dx.doi.org/10.1155/2012/897074.

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The integral-differential equation for the current of an electrically small antenna, inside a resonator, which is induced by given sources, is approximately solved by the so-called “Method of Small Antenna,” both for dipole and loop antennas. The current induced in the antenna is evaluated using the scattering characteristics of small antennas in free space and regularized Green’s function of resonator. As example of application of the theory, a transfer function (“external field→induced voltage”) for the coupling through aperture is calculated.

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Capozzoli, Amedeo, Claudio Curcio, Giuseppe D'Elia, Flaminio Ferrara, Claudio Gennarelli, Rocco Guerriero, and Angelo Liseno. "A Probe-Compensated Helicoidal NF-FF Transformation for Aperture Antennas Using a Prolate Spheroidal Expansion." International Journal of Antennas and Propagation 2012 (2012): 1–13. http://dx.doi.org/10.1155/2012/753156.

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A new probe-compensated near-field-far-field (NF-FF) transformation for aperture antennas in a cylindrical scanning geometry is presented. Such a technique takes the advantage of the NF data acquisition made according to a very efficient sampling strategy along a helix and exploits a proper aperture field expansion based on the use of the prolate spheroidal wave functions (PSWFs), accounting for the a priori information on shape and size of the antenna under test. The unknown aperture field expansion coefficients of the PSWFs are evaluated from the acquired voltage samples by an inversion proc

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Kirpanev, A. V., and N. A. Kirpanev. "Methods of antenna and «antenna- radome» system analysis based on amplitude and phase measurements of their far field spherical components." Issues of radio electronics 1, no. 1 (March 13, 2021): 19–25. http://dx.doi.org/10.21778/2218-5453-2021-1-19-25.

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The main principles of electric intensity recovery of electrical field in tested antenna aperture or in the «antenna radome» system radome-close aperture field (false aperture) by amplitude and phase long-range measurements are proposed. Measurements zone means a part of the spherical surface that envelopes analyzed antenna, the boarder of this surface are determined by the kinematic scheme of rotary joint of the scanner. Recovery of amplitude and phase distribution of the field in a flat aperture area or on the plane where array irradiators are located is used in case of wave diagnostics of s

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Wang, Wen-Qin. "Virtual Antenna Array Analysis for MIMO Synthetic Aperture Radars." International Journal of Antennas and Propagation 2012 (2012): 1–10. http://dx.doi.org/10.1155/2012/587276.

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Multiple-input multiple-output (MIMO) synthetic aperture radar (SAR) that employs multiple antennas to transmit orthogonal waveforms and multiple antennas to receive radar echoes is a recently proposed remote sensing concept. It has been shown that MIMO SAR can be used to improve remote sensing system performance. Most of the MIMO SAR research so far focused on signal/data models and corresponding signal processing algorithm. Little work related to MIMO SAR antenna analysis can be found. One of the main advantages of MIMO SAR is that the degrees of freedom can be greatly increased by the conce

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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 rotat

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Wang, Sungsik, Hyunsoo Kim, Dongyoon Kim, and Hosung Choo. "Multi-Band Array Antenna Sharing a Common Aperture with Heterogeneous Array Elements." Applied Sciences 12, no. 18 (September 18, 2022): 9348. http://dx.doi.org/10.3390/app12189348.

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This paper proposes a multi-band array antenna that shares a common aperture with heterogenous array elements. The multi-band array antenna includes one printed dipole antenna for the S-band and 3 × 3 array E-shaped patch antennas for the X-band. The current directions of the printed dipole and E-shaped antenna are orthogonal to each other, which properly diminishes the mutual coupling interference. To decrease the mutual coupling interference among the X-band components, we placed cavities using multiple vias surrounding the X-band components. To check the validity of the proposed design, the

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Kojima, Seishiro, Naoki Shinohara, and Tomohiko Mitani. "Synthesis loss in receiving array antennas and transmission efficiency in the Fresnel region." Wireless Power Transfer 4, no. 2 (September 2017): 120–31. http://dx.doi.org/10.1017/wpt.2017.10.

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We address transmission between array antennas in the Fresnel region, where there is a difference between the theoretical and actual transmission efficiencies. In particular, we focus on the effect of synthesis loss in the receiving antenna's power combiner circuit caused by amplitude and phase differences among the signals received by the elements. We designed 24 GHz array antennas and investigated the effect of synthesis loss on transmission efficiency via simulation. The synthesis loss was found to increase for smaller transmitting antenna sizes and larger receiving antenna sizes. In additi

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Dong, Jian, Ronghua Shi, Wentai Lei, and Ying Guo. "Minimum Redundancy MIMO Array Synthesis by means of Cyclic Difference Sets." International Journal of Antennas and Propagation 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/323521.

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Antenna array synthesis is an important issue in MIMO radars. By judiciously designing antenna positions, one can create a very long virtual array steering vector with a small number of antennas and therefore achieve very high spatial resolution at a small cost. This paper presents a combinatorial methodology based on cyclic difference sets (CDSs) for minimum redundancy (MR) MIMO array synthesis which seeks to maximize the virtual array aperture for a given number of antennas. First, the key features of CDSs and the CDS-based MR-MIMO layouts are described. Then, the analytical expression of th

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Zhou, Li, and Ming Hou. "Research and Analysis about Array Antennas in Mobile Communications." Advanced Materials Research 760-762 (September 2013): 628–33. http://dx.doi.org/10.4028/www.scientific.net/amr.760-762.628.

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Because the direction of a single antenna is limited, and for strengthening the direct radiant ability of the antenna, we will put the weaker direction antennas together in some way to constitute an antenna array system. The antenna array is also called the array antenna or a disperse antenna array. The antenna cell can be the symmetry center-fed dipole, the aperture antenna, the circle antenna or other forms of the antennas whose direction are limited. In practice, the antenna array is almost constituted of similar antenna cells. I have mainly completed the antenna array direction diagram in

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Cao, Yunqing, Menglong Wang, Daoyuan Sun, and Dan Shan. "A Novel Miniaturized Four-Ridged Horn Antenna with Enhanced Gain." International Journal of Antennas and Propagation 2021 (August 7, 2021): 1–7. http://dx.doi.org/10.1155/2021/8143395.

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Miniaturization of wideband antennas has attracted much attention for its wide application in modern society. This article proposes a novel broadband miniaturized four-ridged horn antenna (FRHA) with high gain operating from 2.6 to 8.4 GHz. By filling the FRHA with the epoxy-laminated glass cloth board, the side length of the aperture realizes 48% reduction comparing to a traditional ridged horn antenna. The cuboid-shaped polyethylene lens provides good impedance matching between the antenna and the air at low frequencies and decreases the aperture phase error at high frequencies, which optimi

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Love, A. W. "Equivalent circuit for aperture antennas." Electronics Letters 23, no. 13 (1987): 708. http://dx.doi.org/10.1049/el:19870504.

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Povolotsky, F. K., and T. P. Sydorova. "Linear-phase aperture distribution antennas." IEEE Transactions on Antennas and Propagation 44, no. 6 (June 1996): 874–78. http://dx.doi.org/10.1109/8.509891.

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Hagen, Jon B., and Hans A. Baumgartner. "Backscatter gain of aperture antennas." Radio Science 31, no. 4 (July 1996): 693–99. http://dx.doi.org/10.1029/96rs01095.

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Lin, Yecong, and Sai-Wai Wong. "Coplanar Dual-Band Dual-Polarized Shared-Aperture Antenna Array For 4/5G Base Station Applications." Journal of Physics: Conference Series 2245, no. 1 (April 1, 2022): 012020. http://dx.doi.org/10.1088/1742-6596/2245/1/012020.

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Abstract A novel dual-band dual-polarized shared-aperture antenna array is presented for fifth generation wireless communication application. This novel antenna array is a combination of a low-band antenna and four high-band antennas. In order to simplify the design model while achieving broadband, antenna working on low-band (from 0.68 to 0.99 GHz) and antenna working on high-band (from 3.3 to 5.1 GHz) are both loop-shape radiator fed by Y-shape feed. Coplanar, dual-band and shared-aperture are resolved by embedding four HB antenna elements in the LB antenna. From simulation, the proposed cop

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Li, Ming-Jian, Meng Li, Yu-Fei Liu, Xin-Yu Geng, and Yuan-Yuan Li. "A Review on the Development of Spaceborne Membrane Antennas." Space: Science & Technology 2022 (March 7, 2022): 1–12. http://dx.doi.org/10.34133/2022/9803603.

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The membrane antenna technology is a very promising approach to obtain large aperture with light weight and low stowed volume. In the past decades, extensive studies have been carried out on active and passive membrane antennas. However, the practical spaceborne applications are rare due to many challenges, e.g., the surface accuracy maintenance, the on-orbit reliability, and the environmental compatibility. This paper summarizes the history and state-of-art progresses on spaceborne membrane antennas. Curved surface reflectors, conformal active membrane antennas, planar array membrane antennas

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Park, Daesung, and Jaehoon Choi. "A Dual-Band Dual-Polarized Antenna with Improved Isolation Characteristics for Polarimetric SAR Applications." Applied Sciences 11, no. 21 (October 26, 2021): 10025. http://dx.doi.org/10.3390/app112110025.

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A dual-band dual-polarized antenna with high isolation characteristics is proposed for polarimetric synthetic aperture radar (PolSAR) applications. The antenna consists of four dipole antennas and 2 × 2 patch antenna arrays operating at the P-band (450–730 MHz) and Ka-band (34–36 GHz), respectively. The dipole antennas and the patch antenna arrays need dual-linear polarization characteristics to acquire PolSAR data. Improvements in the isolation characteristics at the P-band are achieved by inserting a metamaterial absorber with a fractal geometry between the transmitting (Tx) and receiving (R

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Csathó, Botond Tamás, Bálint Péter Horváth, and Péter Horváth. "Modeling the near-field of extremely large aperture arrays in massive MIMO systems." Infocommunications journal 12, no. 3 (2020): 39–46. http://dx.doi.org/10.36244/icj.2020.3.6.

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Massive multiple-input multiple-output (MIMO) is a key technology in modern cellular wireless communication systems to attain a very high system throughput in a dynamic multi-user environment. Massive MIMO relies on deploying base stations equipped with a large number of antenna elements. One possible way to deploy base stations equipped with hundreds or thousands of antennas is creating extremely large aperture arrays. In this paper, we investigate channel modeling aspects of massive MIMO systems with large aperture arrays, in which many users are located in the near-field of the aperture. On

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Hannan, Hu. "Impulse responses of aperture antennas with arbitrary aperture distributions." Journal of Electronics (China) 3, no. 3 (July 1986): 211–19. http://dx.doi.org/10.1007/bf02778883.

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Karmakar, N. C., and S. K. Padhi. "Very small aperture terminal broadband shared-aperture planar antennas." International Journal of RF and Microwave Computer-Aided Engineering 13, no. 3 (May 2003): 180–93. http://dx.doi.org/10.1002/mmce.10078.

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Dolzhikov, V. V. "Longitudinal distribution of the field intensity of a circular focused aperture." Radiotekhnika, no. 205 (July 2, 2021): 118–28. http://dx.doi.org/10.30837/rt.2021.2.205.13.

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Microwave and millimeter-wave antennas focused in their Fresnel zone, which are usually named as near-field focused (NFF) antennas, are becoming increasingly popular. Indeed, when compared to conventional far-field focused antennas, they can guarantee performance improvement at a relatively limited implementation cost, in short-range communication systems, wireless power transfer arrangements, remote nondestructive sensing setups, and radiofrequency identification apparatus, among many others. In this paper, analytical expressions are obtained for calculating the main parameters characterizing

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Vatutin, S. I. "Synchronous Addition of Antenna Signals with a Shift of Sampling Pulses in Idealized Mode of Spacecraft Tracking by Target Designations." Rocket-Space Device Engineering and Information Systems 7, no. 4 (2020): 22–37. http://dx.doi.org/10.30894/issn2409-0239.2020.7.4.22.37.

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The method of synchronous addition of signals of separate antennas was proposed previously for the aggregation of relatively small-scale aperture antennas into a single digital antenna array (digital antenna field) with a combined area for receiving telemetry signals from spacecraft. In this case, the antennas are mutually spaced by a big enough distance in order to not shade one another. The method is based on the idea of compensating the mutual delays between the antennas of the received signal by a corresponding shift of the sampling pulses of the signals of different antennas. This article

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Vatutin, S. I., and P. A. Kozin. "Synchronous Addition of Antenna Field Signals with a Shift of Sampling Pulses during Spacecraft Tracking by Target Designations with Allowance for the Inertia of Antenna Motion." Rocket-space device engineering and information systems 8, no. 4 (2021): 52–57. http://dx.doi.org/10.30894/issn2409-0239.2021.8.4.52.57.

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The method of synchronous addition of signals of separate antennas was proposed previously for the aggregation of relatively small-scale aperture antennas into a single digital antenna array (digital antenna field) with a combined area for receiving telemetry signals from spacecraft when antennas are mutually spaced by a distance big enough for them not to shade one another. The method is based on the idea of compensating mutual delays between the antennas of the received signal by a corresponding shift of the sampling pulses of the signals of different antennas. The present paper demonstrates

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Heo, Jin Myeong, Jongwon Yoon, Hyun Kim, Youngwan Kim, and Gangil Byun. "A Cross-Correlation-Based Approach to Pattern Distortion and Mutual Coupling for Shared-Aperture Antennas." Applied Sciences 11, no. 20 (October 15, 2021): 9652. http://dx.doi.org/10.3390/app11209652.

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This paper proposes a pattern distortion coefficient as a new figure of merit to quantitatively evaluate both mutual coupling and pattern distortions in multi-antenna systems. The proposed coefficient is defined as a cross correlation between unaffected and affected far-field patterns of antennas under test, and the input patterns are weighted using a Gaussian function to consider the target operation angle. The feasibility of the proposed approach is validated using a two-antenna system composed of an inverted-F antenna and a microstrip patch antenna, and the amount of mutual coupling is adju

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Zhang, Yongwei, and Anthony K. Brown. "Design of wide-band dual–polarized aperture array antennas." International Journal of Microwave and Wireless Technologies 4, no. 3 (April 3, 2012): 373–78. http://dx.doi.org/10.1017/s1759078712000256.

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This paper describes the design of high-performance compact aperture array antennas for radio astronomy and other applications. Three recent antenna developments for square kilometer array design study (SKADS) have been investigated and the performances are compared. In addition to the radio frequency (RF) performance, an essential requirement for the square kilometer array application is the cost per square area. Based on initial large–scale finite array studies, prototypes with different geometries have been fabricated and measured. Guidelines are derived for large–scale wide–band dual-polar

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Kashyap, Neeru, Geetanjali ., Dhawan Singh, and Neha Sharma. "Comprehensive Study of Microstrip Patch Antenna Using Different Feeding Techniques." ECS Transactions 107, no. 1 (April 24, 2022): 9545–57. http://dx.doi.org/10.1149/10701.9545ecst.

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For modern wireless communication systems, miniaturized multiband antennas with enhanced bandwidth and gain are desired to achieve optimum system performance. A planar microstrip patch antenna is preferred because of its small size, low cost, and ease of fabrication. For impedance matching, a conductive metallic patch can be fed by different techniques to deliver the maximum power to the microstrip antenna. The various configurations of inset feed, co-axial feed, aperture feed, and proximity feed, and CPW feed, which are used to excite micro-strip patch antennas, are reviewed in this research

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García-Pino, Antonio. "An analytical simplified model to characterize focused aperture antennas." International Journal of Microwave and Wireless Technologies 8, no. 1 (September 5, 2014): 41–49. http://dx.doi.org/10.1017/s1759078714001196.

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This paper presents an analytical model to characterize the radiation pattern of focused aperture antennas. The model is based on the classic parabolic on pedestal distribution for amplitude, but in this work the focusing phase term is considered and applied in the Fresnel region. The model is useful for millimeter and submillimeter wave imaging radar systems that usually work in the Fresnel region of the antenna. Analytical closed expressions are developed to predict the available resolution (transversal beamwidth) and operating range (axial beamwidth) of such systems. The effects of the firs

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Rusov, Yu S., and S. S. Krapivina. "Research of the Possibilities of Matching the Multi-element Receiving-Transmitting Irradiator Aperture." Radio Engineering, no. 1 (May 30, 2021): 1–13. http://dx.doi.org/10.36027/rdeng.0121.0000168.

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Currently, aperture antennas with spatial excitation, such as reflector antennas and phased array antennas, are widely used in radar. The composition of such an antenna includes an irradiator, which can be made in the form of a small-element array of radiators to form a set of necessary radiation patterns. Monopulse irradiators are often used, which form both total and difference directional patterns. When performing an irradiator based on waveguide parts, radiators in the form of horns or open ends of waveguides are installed in its aperture. Waveguide irradiators with four and twelve horns a

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Comoretto, Gianni, Riccardo Chiello, Matt Roberts, Rob Halsall, Kristian Zarb Adami, Monica Alderighi, Amin Aminaei, et al. "The Signal Processing Firmware for the Low Frequency Aperture Array." Journal of Astronomical Instrumentation 06, no. 01 (March 2017): 1641015. http://dx.doi.org/10.1142/s2251171716410154.

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The signal processing firmware that has been developed for the Low Frequency Aperture Array component of the Square Kilometre Array (SKA) is described. The firmware is implemented on a dual FPGA board, that is capable of processing the streams from 16 dual polarization antennas. Data processing includes channelization of the sampled data for each antenna, correction for instrumental response and for geometric delays and formation of one or more beams by combining the aligned streams. The channelizer uses an oversampling polyphase filterbank architecture, allowing a frequency continuous process

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Indrianti, Rizka Kurnia. "Build a Rectangular Patch Single Microstrip Antenna with Aperture Coupled for Wifi Application 2.4 Ghz." JOURNAL OF INFORMATICS AND TELECOMMUNICATION ENGINEERING 3, no. 1 (July 25, 2019): 8. http://dx.doi.org/10.31289/jite.v3i1.2464.

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<p><span>Wifi technology is a means of obtaining information in a fast way, to strengthen the signal, for that it is required that the functioning antenna emit and receive electromagnetic waves in which contained the information signal. A wide range of antennas have been developed for a wide range of applications, one of which is a microstrip antenna. Microstrip antennas have small characteristics, are lightweight, thin, easy to fabricate, and can be used at very long distances. The results of single rectangular patch microstrip antenna measurements indicate that the antenna can wo

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Meshcheriakov, Viktor V., Natalia V. Markova, and Pavel D. Iurmanov. "Modeling and Practical Implementation of a Broadband Double-Ridged Horn Antenna with an Operating Range More Than an Octave and a High Level of Cross-Polarization Discrimination." Journal of the Russian Universities. Radioelectronics 22, no. 5 (December 4, 2019): 42–51. http://dx.doi.org/10.32603/1993-8985-2019-22-5-42-51.

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Introduction. The resolution of the problem of radio polarimetry in multiposition microwave screening systems (MMSS) with aperture synthesis requires the use of antennas with a high level of cross-polarization discrimination (XPD) in a wide spatial angle. The radio images are reconstructed in MMSS at distances commensurate with the aperture of the antenna structures. Therefore, the value of the spatial angle, at which high XPD is required, can reach 30°. This leads to a new problem of creating an antenna configuration of the X and Ku band, the application of which in MMSS will resolve the prob

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