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Antennas and Propagation Society Symposium 1991 Digest最新文献

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A new time delay concept using integrated optics techniques 基于集成光学技术的延时概念
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.175046
N. Hartman, L. Corey
{"title":"A new time delay concept using integrated optics techniques","authors":"N. Hartman, L. Corey","doi":"10.1109/APS.1991.175046","DOIUrl":"https://doi.org/10.1109/APS.1991.175046","url":null,"abstract":"An integrated optic time-delay unit is described which relies on a folded path optical waveguide to achieve time delays ranging from a few picoseconds to several nanoseconds. The folded path configuration utilizes thick phase gratings as reflective elements. These elements provide large angle deflection, high diffraction or reflectivity, and wavelength multiplexing capabilities, and form the basis for an electronically addressable switch. By cascading gratings or alternatively utilizing long gratings, the transmitted optical signal is expected to be reduced to -40 dB to -60 dB or better, thus offering excellent isolation. The folded path configuration is the key to a small compact package. Using low loss waveguides, it is projected that time delays up to 10 ns can be achieved in a package size of 25 mm by 75 mm. The delay line concept, with the exception of active switching, has been demonstrated using ion exchange waveguides and surface relief gratings.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126380715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Analysis and simulation of collision avoidance TCAS antennas mounted on aircraft 机载TCAS防撞天线的分析与仿真
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.175001
K. S. Sampath, R. Rojas, W. Burnside
{"title":"Analysis and simulation of collision avoidance TCAS antennas mounted on aircraft","authors":"K. S. Sampath, R. Rojas, W. Burnside","doi":"10.1109/APS.1991.175001","DOIUrl":"https://doi.org/10.1109/APS.1991.175001","url":null,"abstract":"Two different implementations of the TCAS (traffic-alert collision avoidance system) are discussed: one uses an eight-element circular antenna array and works on a monopulse principle: the other uses a four-element antenna array and an amplitude comparison scheme. The system models and results for the TCAS on a Boeing 737-200 aircraft are presented. Both the elevation angle and the distance of the antenna from the nose were varied. The performance of the systems was shown to get better in the forward quadrant as one gets closer to the nose of the aircraft. The performance of the four-element TCAS was was generally not as good as that of the eight-element monopulse system, except in the nose quadrant where they were comparable. However, the four-element amplitude system is much simpler in its implementation than the eight-element monopulse system.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126403244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Characterization of standing wave movement by in-line antennas 直列天线对驻波运动的表征
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.175007
R. Vaughan, N. Scott, J.P.T.T.K. Southon
{"title":"Characterization of standing wave movement by in-line antennas","authors":"R. Vaughan, N. Scott, J.P.T.T.K. Southon","doi":"10.1109/APS.1991.175007","DOIUrl":"https://doi.org/10.1109/APS.1991.175007","url":null,"abstract":"The interaction of incident radiowave fields with multiple-port antennas on a moving vehicle is investigated. The interest is for in-line antennas which trace identical paths through a standing wave field and receive similar, but not identical, (time-displaced) signals as the mobile moves through typical multipath environments. The investigation quantifies the similarity of the received signals using the average peak cross-correlation of the envelopes. This, as a function of the antenna spacing, offers a quantitative assessment of the effective movement of standing wave fields. However, when the antenna spacing is less than 0.5 wavelengths, the peak cross-correlation measure is strongly perturbed by the mutual coupling effects of terminated antennas. For the 851 MHz measurements reported, the speed range of 15 km/h to 50 km/h (12 to 40 wavelengths per second) did not consistently affect the results for antenna spacings of up to 1.44 m (4.1 wavelengths).<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126413272","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Frequency upconversion behavior of singly balanced diode mixers 单平衡二极管混频器的频率上变频特性
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.174812
K. Chang, T. Chen, H. Wang, S. Maas
{"title":"Frequency upconversion behavior of singly balanced diode mixers","authors":"K. Chang, T. Chen, H. Wang, S. Maas","doi":"10.1109/APS.1991.174812","DOIUrl":"https://doi.org/10.1109/APS.1991.174812","url":null,"abstract":"The frequency upconversion behavior of singly balanced diode mixers with 90 degrees and 180 degrees hybrids has been investigated analytically. It is concluded that only the mixer realized with the 180 degrees hybrid can be used for frequency upconversion. That the mixer with a 90 degrees hybrid cannot be used as an upconverter effectively has been experimentally verified.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121850213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
EM scattering from a lossy dielectric triangular cylinder-based on novel coupled boundary integral equations 基于新型耦合边界积分方程的有耗介质三角形圆柱体电磁散射
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.174903
H. Yin, Wen Xun Zhang
{"title":"EM scattering from a lossy dielectric triangular cylinder-based on novel coupled boundary integral equations","authors":"H. Yin, Wen Xun Zhang","doi":"10.1109/APS.1991.174903","DOIUrl":"https://doi.org/10.1109/APS.1991.174903","url":null,"abstract":"The TM or TE scattering of an electromagnetic plane wave from a lossy dielectric cylinder with arbitrary cross section is analyzed and computed by using a general computer program of the boundary-element method. The numerical results for the scattering pattern for a circular cylinder completely coincide with the analytical solution. Results for the scattering pattern and backscattering RCS (radar cross section) of a regular triangular cylinder with different sizes and permittivities for different incidence angles are also presented. It is shown that when the size of the cross section is the wavelength, the forward scattering is maximum, the backscattering RCS for normal incidence to the side of the cross section remains constant, and the optimal structure of the dielectric for minimizing the backscattering can be found.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121974945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
A time-domain superresolution technique for antenna measurements and scattering studies 天线测量和散射研究的时域超分辨技术
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.175062
Y. Ogawa, H. Yamada, K. Itoh
{"title":"A time-domain superresolution technique for antenna measurements and scattering studies","authors":"Y. Ogawa, H. Yamada, K. Itoh","doi":"10.1109/APS.1991.175062","DOIUrl":"https://doi.org/10.1109/APS.1991.175062","url":null,"abstract":"The authors show that the superresolution technique can be used for antenna measurements and scattering studies. They describe experimental results of antenna measurements and simulation results of electromagnetic scattering mechanism extraction using MUSIC. It is shown that, using MUSIC, one can isolate the individual scattering centers and can obtain each diffraction coefficient using much narrower bandwidth data than the FFT (fast Fourier transform) and gating techniques.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130011066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
An 'edge' element solution of electromagnetic transmission through apertures in inhomogeneously loaded cavities 非均匀载荷腔隙中电磁传输的“边缘”元解
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.174991
J. Wang, N. Ida
{"title":"An 'edge' element solution of electromagnetic transmission through apertures in inhomogeneously loaded cavities","authors":"J. Wang, N. Ida","doi":"10.1109/APS.1991.174991","DOIUrl":"https://doi.org/10.1109/APS.1991.174991","url":null,"abstract":"Electromagnetic transmission into a conducting body through an aperture has been solved using the method of moments. The authors solve a similar problem in which an inhomogeneously loaded open cavity is under external excitation. While a surface-type method-of-moments solution alone is not possible, the finite-element method is combined with the method of moments. To avoid the occurrence of possible nonphysical solutions, the class of tangentially continuous finite elements, or edge elements, and the consistent boundary elements are used.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"52 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130277875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Theoretical and experimental results for a thick skew-grid FSS with rectangular apertures at oblique incidence 斜入射矩形孔厚斜栅FSS的理论与实验结果
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.175224
J.C. Chen, P. Stanton
{"title":"Theoretical and experimental results for a thick skew-grid FSS with rectangular apertures at oblique incidence","authors":"J.C. Chen, P. Stanton","doi":"10.1109/APS.1991.175224","DOIUrl":"https://doi.org/10.1109/APS.1991.175224","url":null,"abstract":"Theoretical and experimental results for the reflection characteristics of a thick plate containing rectangular holes on a skew grid at oblique angles of incidence are presented. By including a large number of waveguide modes in the solution, excellent agreement between theory and experiment has resulted. The use of a corrugated horn and lens allowed a high-quality test of the theory using a relatively small plate in the near field of the horn. The software is now being used to design thick frequency selective surfaces for high-power low-noise applications in the Deep Space Network.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134017677","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Scattering by a moving object: Computations and measurements 运动物体的散射:计算和测量
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.175168
M. Vogel, P. M. van den Berg
{"title":"Scattering by a moving object: Computations and measurements","authors":"M. Vogel, P. M. van den Berg","doi":"10.1109/APS.1991.175168","DOIUrl":"https://doi.org/10.1109/APS.1991.175168","url":null,"abstract":"The authors consider the relativistic scattering of a monochromatic electromagnetic wave by an electrically perfectly conducting object that moves with uniform velocity v in the x-direction of a stationary reference frame. A co-moving reference frame in which the object is at rest is also defined. The two reference frames are mutually related by the Lorentz transformation. A plane-wave representation of the incident field is used. These plane waves are transformed to the co-moving reference frame; they remain plane waves. The scattering problem in this co-moving reference frame is solved using the physical-optics approximation. The scattered field is written as a plane-wave representation. These plane waves are transformed back to the stationary reference plane; they remain plane waves. For low velocities of the object, numerical results pertaining to the electric field quantity are compared with experimental results.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133944195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Dielectric coated meandering, leakywave long slot waveguide antennas 介质涂层弯曲漏波长槽波导天线
Antennas and Propagation Society Symposium 1991 Digest Pub Date : 1991-06-24 DOI: 10.1109/APS.1991.175095
F.L. Whetten, C. Balanis, S. Hogberg
{"title":"Dielectric coated meandering, leakywave long slot waveguide antennas","authors":"F.L. Whetten, C. Balanis, S. Hogberg","doi":"10.1109/APS.1991.175095","DOIUrl":"https://doi.org/10.1109/APS.1991.175095","url":null,"abstract":"Theoretical analyses of the dielectric coated meandering leakywave long slot's aperture field distribution, far-field radiation amplitude patterns, and isolation with another similar antenna configured in parallel are performed. and numerical results are computed. In the analysis of the slot antenna, it is assumed that the slot is cut on the broad wall of a rectangular waveguide which is embedded in a ground plane of infinite extent. The ground plane and antenna aperture are coated with a uniform dielectric slab of arbitrary thickness, permittivity, and permeability.<<ETX>>","PeriodicalId":264366,"journal":{"name":"Antennas and Propagation Society Symposium 1991 Digest","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134375748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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