Bibliografie tematiche / Aperture antennas

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Letteratura scientifica selezionata sul tema "Aperture antennas"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 20 febbraio 2023

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Articoli di riviste sul tema "Aperture antennas"

1

Prof. Romi Morzelona. "Evaluation and Examination of Aperture Oriented Antennas". International Journal of New Practices in Management and Engineering 6, n. 01 (31 marzo 2017): 01–07. http://dx.doi.org/10.17762/ijnpme.v6i01.49.

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Abstract (sommario):
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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2

Musa, Doaa Salim Mohammed, Ramazan Daşbaşı e Burak Polat. "Evaluation of Radiation Performances of Various Aperture and Horn Antennas over Sea Surface". European Journal of Research and Development 2, n. 2 (7 giugno 2022): 429–44. http://dx.doi.org/10.56038/ejrnd.v2i2.89.

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Abstract (sommario):
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 and compared to check the parametric accuracy of DCM numerically. In the second step, these directional currents are employed in deriving the analytical radiation fields of the antennas under investigation over sea surface by incorporating Green’s functions based on Norton’s formulation. This is followed by CSTTM simulations to observe the parametric accuracy of DCM expressions for microwave radiation over sea surface.
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3

Pang, Ke, Yongjun Xie, Legen Dai e Peiyu Wu. "Design of Ultra High Aperture Efficiency Surface Wave Antenna Array Based on the Three-Dimensional Aperture Principle". Electronics 11, n. 21 (28 ottobre 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 100% in this situation. The gain of the surface wave end-fire element antenna is 9.5 dBi. The proposed 3 × 3 square antenna array with the size of 1.5λ × 1.5λ × 2.24λ obtains a gain of 15.3 dBi and its aperture efficiency reaches 120%.
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Qu, Bingyue, Sen Yan, Anxue Zhang, Yongqiang Pang e 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, n. 4 (25 ottobre 2021): 045002. http://dx.doi.org/10.1088/1361-6463/ac2f69.

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Abstract (sommario):
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 results both corroborate that the presented shared-aperture antenna can achieveomnidirectional radiation at around 3.1 GHz and end-fire radiation at around 10.65 GHz, with peak gains about 1.90 dB and 6.24 dB, respectively. Without using several radiators and complex feeding networks, the antenna can work in two bands with different radiation patterns. This work provides an effective alternative design for shared-aperture antennas in light-weight and multi-functional wireless communication systems.
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Wang, Congsi, Haihua Li, Kang Ying, Qian Xu, Na Wang, Baoyan Duan, Wei Gao, Lan Xiao e 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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Abstract (sommario):
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 performance compensation methods for radio telescope antennas is introduced. Further, a series of analyses of the five key technologies of active surface adjustment is presented. Then, four typical large antennas that have been designed with active main reflector technology are presented and compared. Finally, future research directions and suggestions for reflector antenna compensation methods based on active surface adjustment are presented.
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Ding, Kaicheng, Lei Sun e Daqun Yu. "A Dual-Band Shared-Aperture Antenna Array Design". Journal of Physics: Conference Series 2419, n. 1 (1 gennaio 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 requirements.
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Washington, Gregory. "Smart aperture antennas". Smart Materials and Structures 5, n. 6 (1 dicembre 1996): 801–5. http://dx.doi.org/10.1088/0964-1726/5/6/010.

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8

Xue, Yulong, Qihao Zhang, Yangming Ren, Yufang Lei, Xiaochen Sun e 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, n. 24 (15 agosto 2022): 7158. http://dx.doi.org/10.1364/ao.463542.

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Abstract (sommario):
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 ∘ beamwidth within the 3 dB steering range of 14 ∘ × 11 ∘ limited by the numerical aperture of the far-field camera system. The method can be easily extended to a larger aperture for narrower beamwidth and wider steering range.
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Ilnitskyi, Ludvig, Leonid Sibruk e Inna Mykhalchuk. "Considerations for Far-field Antennas Test". Electronics and Control Systems 2, n. 68 (22 novembre 2021): 56–61. http://dx.doi.org/10.18372/1990-5548.68.16092.

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Abstract (sommario):
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 permissible dimensions of the antenna aperture are obtained. The influence of the antenna hanging heights on the measurement accuracy was also investigated. Recommendations for reducing the level of electromagnetic waves reflected from the earth's surface are given.
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Gu, Chunwang, Hao Liu e Min Yi. "Lightweight Fan-Beam Microstrip Grid Antenna for Airborne Microwave Interferometric Radiometer Applications". Micromachines 14, n. 1 (15 gennaio 2023): 228. http://dx.doi.org/10.3390/mi14010228.

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Abstract (sommario):
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 and Passive (MICAP) onboard a Chinese Ocean Salinity Mission (COSM). With a limited size constraint (12.33 mm) on the antenna width, a fan-beam shape antenna pattern was achieved with a 5.34° 3-dB beamwidth in the narrow beam direction and up to a 55° 3-dB beamwidth in the fan-beam direction. A periodic structural unit is proposed in this paper to reduce the design complexity of Taylor weighting, achieving desirable performances on gain (19.1 dB) and sidelobe level (<−20 dB) in the H-plane. Four antenna elements were fabricated and arranged in a non-redundant sparse array. The performance of the four-element sparse array was evaluated with a simulation and real measurement in an anechoic chamber. The coupling between antenna elements was less than −25 dB, and the consistency of phase patterns was better than 3.4°. These results verify the feasibility of the proposed K-band microstrip grid antenna for airborne MIR applications.
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Tesi sul tema "Aperture antennas"

1

Kujiraoka, Scott R., e Vries James M. De. "REDUCED APERTURE MICROSTRIP ANTENNAS FOR AIRBORNE VEHICLES". International Foundation for Telemetering, 1998. http://hdl.handle.net/10150/607353.

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Abstract (sommario):
International Telemetering Conference Proceedings / October 26-29, 1998 / Town & Country Resort Hotel and Convention Center, San Diego, California
The available space for the mounting of antennas on missiles and airborne targets is very limited. The vehicle integrator is constantly striving for smaller antenna apertures while requiring increased performance. Microstrip antennas with moderate dielectric loading have been successfully utilized in the past to meet these requirements. With the advent of high dielectric substrate materials, the designer now has the option of further reducing the size of the antenna while preserving the most desirable performance attributes. An example of the size reduction achievable with the new substrate materials is presented along with performance characteristics.
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2

Zivanovic, Bojana. "Series-Fed Aperture-Coupled Microstrip Antennas and Arrays". Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4425.

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The focus of this dissertation is on the development and circuit modeling of planar series-fed, linear- and circular-polarized microstrip aperture-coupled antennas and N-element arrays operating in C-band. These arrays were designed to be used as part of airborne or land-based frequency-hopped communication systems. One of the main objectives of this work was to maintain a constant beam angle over the frequency band of operation. In order to achieve constant beam pointing versus frequency, an anti-symmetric series-fed approach using lumped-element circuit models was developed. This series feed architecture also balances the power radiated by each element in the N-element arrays. The proposed series-fed approach was used in the development of four-element series-fed aperture-coupled arrays with 15% 10 dB impedance bandwidth centered at 5 GHz and a gain of 11.5 dB, to construct an omni-directional radiator. Omni-directional radiators with pattern frequency stability are desired in a multitude of applications; from defense in tactical communications, information gathering, and detection of signal of interest to being part of sensors in medical applications. A hexagonal assembly of six series-fed microstrip aperture-coupled four-element arrays was used to achieve the omni-directional radiation with 0.6 dB peak to peak difference across 360˚ broadside pattern and 0.6 dB gain variation at the specific azimuth angle across 15% impedance bandwidth. Given that each of these six arrays can be individually controlled, this configuration allows for individual pattern control and reconfiguration of the omni-directional pattern with increased gain at specific azimuth angles and the ability to form a directional pattern by employing a fewer number of arrays. Incorporating a beam-forming network or power distribution network is also possible. Wide 3 dB circular polarization (CP) bandwidth was achieved without external couplers and via only a single feed with a unique Z-slot aperture-coupled microstrip antenna. A single RHCP Z-slot aperture-coupled antenna has ∼10% CP and 10 dB impedance bandwidth. The series-fed network consisting of lumped elements, open-circuited stubs and transmission lines was subsequently developed to maintain more than 5% CP and 10% 10 dB impedance bandwidth in the series-fed four-element Z-slot aperture-coupled CP array that could also be used for-omni-directional radiation.
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3

Zhang, Tieren, University of Western Sydney, of Science Technology and Environment College e School of Engineering and Industrial Design. "Applications of microwave holography to the assessment of antennas and antenna arrays". THESIS_CSTE_EID_Zhang_T.xml, 2001. http://handle.uws.edu.au:8081/1959.7/770.

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Abstract (sommario):
Gabor's original holography, which is the basic theory of modern microwave holographic techniques, is introduced. By computer simulations, it is demonstrated that the conventional holographic approach can be used as a tool to reconstruct aperture field distributions of an antenna with some constraints. Computer simulations of the theory and technique of the improved microwave holographic approach originally introduced by Rahmat-Samii et al. are carried out. The results show that it can be used for surface distortion diagnosis of large reflector antennas. The physical optics integral formulation is derived by general solutions of the vector wave equations. The necessary theory , which is needed to reconstruct the aperture field from near-field measurements both in a rectangular coordinate system and in a cylindrical coordinate system is developed. It is based on the plane wave spectrum and the vector wave modal expansion of an electromagnetic field. By using a simple dipole and other well-defined antennas, computer simulations have been performed. The results show that the technique is rigorous and applicable. It is also demonstrated that the sampling intervals and the number of sampling points should be chosen carefully in order to obtain a satisfactory resolution of the reconstructed aperture field. Furthermore, the simulations carried out in this work reveal that the real aperture field distribution of a dipole antenna has a maximum point at each end of the antenna. This characteristic can only be obtained at a very close distance to the antenna. This study also reveals the significant contributions of the evanescent waves to the aperture reconstruction. A simple but effective method for examining the evanescent waves from the measured near-field is also presented. By using dipoles and other well known antennas and antenna arrays, the experiments were carried out. The experimental results provide reasonable good agreements with the simulations. The technique proposed is effective and accurate.
Doctor of Philosophy (PhD)
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4

Cheng, Chin-Yuan. "Numerical electromagnetic modeling of a small aperture helical-fed reflector antenna". Ohio : Ohio University, 1998. http://www.ohiolink.edu/etd/view.cgi?ohiou1176838193.

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Zhang, Tieren. "Applications of microwave holography to the assessment of antennas and antenna arrays". Thesis, View thesis, 2001. http://handle.uws.edu.au:8081/1959.7/770.

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Abstract (sommario):
Gabor's original holography, which is the basic theory of modern microwave holographic techniques, is introduced. By computer simulations, it is demonstrated that the conventional holographic approach can be used as a tool to reconstruct aperture field distributions of an antenna with some constraints. Computer simulations of the theory and technique of the improved microwave holographic approach originally introduced by Rahmat-Samii et al. are carried out. The results show that it can be used for surface distortion diagnosis of large reflector antennas. The physical optics integral formulation is derived by general solutions of the vector wave equations. The necessary theory , which is needed to reconstruct the aperture field from near-field measurements both in a rectangular coordinate system and in a cylindrical coordinate system is developed. It is based on the plane wave spectrum and the vector wave modal expansion of an electromagnetic field. By using a simple dipole and other well-defined antennas, computer simulations have been performed. The results show that the technique is rigorous and applicable. It is also demonstrated that the sampling intervals and the number of sampling points should be chosen carefully in order to obtain a satisfactory resolution of the reconstructed aperture field. Furthermore, the simulations carried out in this work reveal that the real aperture field distribution of a dipole antenna has a maximum point at each end of the antenna. This characteristic can only be obtained at a very close distance to the antenna. This study also reveals the significant contributions of the evanescent waves to the aperture reconstruction. A simple but effective method for examining the evanescent waves from the measured near-field is also presented. By using dipoles and other well known antennas and antenna arrays, the experiments were carried out. The experimental results provide reasonable good agreements with the simulations. The technique proposed is effective and accurate.
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6

Zhang, Tieren. "Applications of microwave holography to the assessment of antennas and antenna arrays". View thesis, 2001. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20040330.103805/index.html.

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Abstract (sommario):
Thesis (Ph.D.) -- University of Western Sydney, 2001.
"Submitted in fulfilment of requirements for the degree of Doctor of Philosophy, School of Engineering and Industrial Design, University of Western Sydney" Includes bibliography.
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7

Arakaki, Dean Yasuo. "A reciprocity approach for analyzing radiation from aperture and nicrostrip antennas". Adobe Acrobat reader required to view the full dissertation, 2000. http://www.etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-21/index.html.

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8

Robinson, Bryan. "Mathematical modelling of aperture coupled patch antennas with multi-layered superstrates". Thesis, Northumbria University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245239.

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Monkevich, James Matthew. "Analysis of Aperture Radiation Using Computer Visualization and Image-Processing Techniques". Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36735.

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Abstract (sommario):
In order to accurately describe the behavior of an antenna, one needs to understand the radiation mechanisms that govern its operation. One way to gain such an insight is to view the fields and currents present on a radiating structure. Unfortunately, in close proximity to an antenna empirical techniques fail because the measurement probe alters the operation of the radiating structure. Computational methods offer a solution to this problem. By simulating the operation of an antenna, one can obtain electromagnetic field data near (or even internal to) a radiating structure. However, these computationally intense techniques often generate extremely large data sets that cannot be adequately interpreted using traditional graphical approaches.

A visualization capability is developed that allows an analysis of the above-mentioned data sets. With this technique, the data is viewed from a unique, global perspective. This format is well suited for analytical investigations as well as debugging during modeling and simulation. An illustrative example is provided in the context of a rectangular microstrip patch antenna. A comparison is performed between the visualized data and the theory of operation for the microstrip patch in order to demonstrate that radiation mechanisms can be obtained visually.

An additional analysis tool is developed using Gabor filters and image-processing techniques. This tool allows one to detect and filter electromagnetic waves propagating with different velocities (both speed and direction). By doing so, each mode of an antenna can be analyzed independently. The fields of a multi-moded, open-ended rectangular waveguide are analyzed in order to demonstrate the effectiveness of these techniques.
Master of Science

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Ozdemir, Caner. "Synthetic aperture radar algorithms for imaging antenna-platform scattering /". Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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Più fonti

Libri sul tema "Aperture antennas"

1

Maclean, T. S. M. Principles of antennas: Wire and aperture. Cambridge [Cambridgeshire]: Cambridge University Press, 1986.

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2

Bird, Trevor S. Fundamentals of aperture antennas and arrays: From theory to design, fabrication and testing. Chichester, West Sussex, United Kingdom: John Wiley & Sons Inc., 2016.

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3

Boriskin, Artem, e Ronan Sauleau, a cura di. Aperture Antennas for Millimeter and Sub-Millimeter Wave Applications. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-62773-1.

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4

Reddy, C. J. Frequency response calculations of input characteristics of cavity-backed aperture antennas using AWE with hybrid FEM/MoM technique. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1997.

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5

Reddy, C. J. Analysis of three-dimensional-cavity-backed aperture antennas using a combined finite element method/method of moments/geometrical theory of diffraction technique. Hampton, Va: Langley Research Center, 1995.

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6

Földes, Péter. A design study for the use of a multiple aperture deployable antenna for soil moisture remote senisng satellite applications. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1986.

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Paul, Casasent David, e Society of Photo-optical Instrumentation Engineers., a cura di. Transition of optical processors into systems 1994: 4 April 1994, Orlando, Florida. Bellingham, Wash., USA: SPIE, 1994.

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Bailey, M. C. Closed-form evaluation of mutual coupling in a planar array of circular apertures. Washington, D.C: National Aeronautics and Space Administration, 1996.

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Bailey, M. C. Closed-form evaluation of mutual coupling in a planar array of circular apertures. Hampton, Va: Langley Research Center, 1996.

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Center, Langley Research, a cura di. Angular power spectrums and their relationship to autocorrelation functions of aperture antennas. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1985.

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Capitoli di libri sul tema "Aperture antennas"

1

Smith, Martin S. "Aperture Theory". In Introduction to Antennas, 33–58. London: Macmillan Education UK, 1988. http://dx.doi.org/10.1007/978-1-349-19384-4_3.

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Rohlfs, Kristen. "Filled Aperture Antennas". In Astronomy and Astrophysics Library, 70–99. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-662-02465-2_5.

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Rohlfs, K., e T. L. Wilson. "Filled Aperture Antennas". In Astronomy and Astrophysics Library, 137–65. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-05394-2_6.

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Wilson, Thomas L., e Susanne Hüttemeister. "Filled Aperture Antennas". In Astronomy and Astrophysics Library, 29–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-642-57001-8_6.

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Sangster, Alan J. "Compact Aperture Antennas". In Signals and Communication Technology, 57–80. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-01753-8_3.

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Rohlfs, K., e T. L. Wilson. "Filled Aperture Antennas". In Astronomy and Astrophysics Library, 137–65. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-662-03266-4_6.

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Baum, C. E. "Antenna-Aperture Synthesis for Hyperband SAR Antennas". In Ultra-Wideband, Short-Pulse Electromagnetics 7, 206–14. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-37731-5_24.

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Sangster, Alan J. "Aperture Antennas for Solar Systems". In Electromagnetic Foundations of Solar Radiation Collection, 73–95. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-08512-8_4.

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Rahman, Habibur. "Aperture and Phased Array Antennas". In Fundamental Principles of Radar, 197–228. Boca Raton : Taylor & Francis, [2019]: CRC Press, 2019. http://dx.doi.org/10.1201/9780429279478-11.

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Hua, Tan Pek, Dennis Goh, P. R. P. Hoole e U. R. Abeyratne. "Synthetic Aperture Antennas and Imaging". In Smart Antennas and Electromagnetic Signal Processing in Advanced Wireless Technology, 167–93. New York: River Publishers, 2022. http://dx.doi.org/10.1201/9781003339564-6.

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Atti di convegni sul tema "Aperture antennas"

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Jin, Eric X., Liang Wang e Xianfan Xu. "Plasmonic-Enhanced Radiative Transfer Through Nanoscale Aperture Antennas". In 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2007. http://dx.doi.org/10.1115/mnc2007-21589.

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Nanoscale ridge aperture antenna as a nanoscale high transmission optical device is demonstrated. High transfer efficiency and confined radiation are achieved simultaneously in the near field compared with regularly-shaped apertures. The radiation enhancement is attributed to the fundamental electromagnetic field propagating in the TE10 mode concentrated in the gap between the ridges. The transfer efficiency is further enhanced through plasmon excitation and resonance. This paper reports spectroscopic measurements of radiative transfer through bowtie shape ridge aperture antennas. Resonance in these aperture antennas and its relation with the aperture geometry are investigated. The near-field radiation through the bowtie aperture and the regular nanoaperture is also mapped with near-field scanning optical microscopy. It is revealed that plasmon excitation and resonance contribute to the radiation enhancement through the ridge aperture antennas.
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Jin, Eric X., Liang Wang e Xianfan Xu. "Plasmonic-Enhanced Radiative Transfer Through Nanoscale Aperture Antennas". In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-13778.

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Nanoscale ridge aperture antenna as a nanoscale high transmission optical device is demonstrated. High transfer efficiency and confined radiation are achieved simultaneously in the near field compared with regularly-shaped apertures. The radiation enhancement is attributed to the fundamental electromagnetic field propagating in the TE10 mode concentrated in the gap between the ridges. The transfer efficiency is further enhanced through plasmon excitation and resonance. This paper reports spectroscopic measurements of radiative transfer through bowtie shape ridge aperture antennas. Resonance in these aperture antennas and its relation with the aperture geometry are investigated. The near-field radiation through the bowtie aperture and the regular nanoaperture is also mapped with near-field scanning optical microscopy. It is revealed that plasmon excitation and resonance contribute to the radiation enhancement through the ridge aperture antennas.
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Yoon, Hwan-Sik, e Gregory Washington. "Analysis of Active Doubly Curved Antenna Structures". In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0957.

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Abstract Recently, aperture antennas that have the ability to change their reflector shape through the usage of piezoelectric actuators have been studied. The results show that those antennas can exhibit beam steering and beam shaping in the far-field. However, the previous studies have been confined to cylindrical shape antennas. This study examines the use of “doubly curved” antenna structures to achieve better performance in controlling an antenna’s coverage area. The spherical antenna is modeled as a shallow spherical shell with a small hole at the apex for mounting. Following Reissener’s approach, a stress function is introduced and two governing equations are derived in terms of the stress function and the axial deflection. Next, the amount of deflections are evaluated from the calculated stress function and the axial deflection. As actuators, four PZT strip actuators are attached along the meridians separated by 90 degrees respectively. The force developed by the actuators are expanded in Fourier series and fed into the governing equations as boundary conditions at the outer edge. Finally, the Deflection vs. Applied Voltage is calculated analytically and its effect on the far-field radiation is given.
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Shafai, Lotfollah, Satish K. Sharma e Cyrus Shafai. "Antenna Miniaturization and Adaptive Aperture Antennas". In 2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting. IEEE, 2020. http://dx.doi.org/10.1109/ieeeconf35879.2020.9330116.

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Washington, Gregory N. "Smart aperture antennas". In 1996 Symposium on Smart Structures and Materials, a cura di Vijay K. Varadan e Paul J. McWhorter. SPIE, 1996. http://dx.doi.org/10.1117/12.240443.

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Yoon, Hwan-Sik, e Gregory N. Washington. "Piezoceramic actuated aperture antennas". In 5th Annual International Symposium on Smart Structures and Materials, a cura di Vijay K. Varadan, Paul J. McWhorter, Richard A. Singer e Michael J. Vellekoop. SPIE, 1998. http://dx.doi.org/10.1117/12.320165.

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7

Darrow, J. T., X. C. Zhang, M. Mack e D. H. Auston. "Generation and detection of ultrashort pulsed electromagnetic radiation by large-aperture photoconducting antennas". In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.mq2.

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Large-aperture photoconducting antennas have been used to both generate and detect ultrafast submillimeter electromagnetic radiation. When photoconductively driven by optical pulses with energies in the range of 10-4 J/cm2, emitting antennas have produced far-infrared peak electric fields that are comparable to the bias field. Large-aperture emitters of semi-insulating InP with various electrode spacings (1,4, and 10 mm) have been measured. In contrast with previously used dipole antennas, which have a 5 μm radiation-damaged silicon-on-sapphire photoconducting gap, our new detectors have electrodes spaced 0.1-1 mm apart and also have a larger dynamic range.
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Chair, R., A. A. Kishk, K. F. Lee e C. E. Smith. "Unidirectional wideband slot aperture antennas". In IEEE Antennas and Propagation Society Symposium, 2004. IEEE, 2004. http://dx.doi.org/10.1109/aps.2004.1330567.

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Qinjiang Rao, T. A. Denidni e R. H. Johnston. "Miniaturized aperture-coupled microstrip antennas". In IEEE Antennas and Propagation Society Symposium, 2004. IEEE, 2004. http://dx.doi.org/10.1109/aps.2004.1332111.

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Ovejero, David Gonzalez, Gabriele Minatti, Marco Faenzi, Francesco Caminita, Enrica Martini e Stefano Maci. "Shared-aperture modulated metasurface antennas". In 2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS). IEEE, 2017. http://dx.doi.org/10.23919/ursigass.2017.8105100.

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Rapporti di organizzazioni sul tema "Aperture antennas"

1

Debroux, Patrick, Berenice Verdin e Samuel Pichardo. An Algorithm to Calculate Phase-Center Offset of Aperture Antennas when Measuring 2-Dimensional Radiation Patterns. Fort Belvoir, VA: Defense Technical Information Center, gennaio 2015. http://dx.doi.org/10.21236/ada614347.

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2

Sullivan, Peter L., e Daniel H. Schaubert. Analysis of an Aperture Coupled Microstrip Antenna. Fort Belvoir, VA: Defense Technical Information Center, febbraio 1986. http://dx.doi.org/10.21236/ada165283.

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Kominek, Allen K., e Harry T. Shamansky. Sub-Aperture Antenna Modeling on Fixed Wing Aircraft. Fort Belvoir, VA: Defense Technical Information Center, luglio 2001. http://dx.doi.org/10.21236/ada397118.

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Ralston, James M., e Elizabeth L. Ayers. Antenna Effects on Polarimetric Imagery in Ultrawide Synthetic Aperture Radar. Fort Belvoir, VA: Defense Technical Information Center, settembre 2002. http://dx.doi.org/10.21236/ada415541.

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Buurma, Andrew W., e Roberto G. Rojas. Aerospace Sensor Component and Subsystem Investigation And Innovation-2 Component Exploration and Development (ASCII-2 CED). Delivery Order 0002: Volume 3 - Reconfigurable Aperture Antenna Virtual Prototyping (General Techniques for De-Embedding RF Passive Devices). Fort Belvoir, VA: Defense Technical Information Center, settembre 2005. http://dx.doi.org/10.21236/ada445437.

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