IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010)最新文献_第8页

EIRP and power efficiency of reconfigurable active transmit antennas 可重构有源发射天线的EIRP和功率效率

IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010) Pub Date : 1999-07-11 DOI: 10.1109/APS.1999.789515

U. Kraft

{"title":"EIRP and power efficiency of reconfigurable active transmit antennas","authors":"U. Kraft","doi":"10.1109/APS.1999.789515","DOIUrl":"https://doi.org/10.1109/APS.1999.789515","url":null,"abstract":"Reconfigurable, active transmit antennas are attractive for a variety of applications in the military and aerospace sector, since they offer antenna pattern flexibility via reconfigurable amplitude/phase control and permit high EIRP-figures with a set of amplifiers operating at fairly low power levels. Such antennas can be realized as direct radiating arrays, single-reflector multi-feed types or array-fed double reflector antennas (magnified arrays) and comprise, in all cases, a radiator section, a set of power amplifiers (PAs) and a low-power BFN. Looking from the systems perspective, one basic need for the handling of such antennas within the systems analysis and design is an antenna model which can be used for a wide variety of antenna types and provides easily usable tools for the prediction of the most relevant system figures. Whereas such a description for the gain and G/T of active receive antennas has been proposed in Kraft and Blaschke (1997), the current contribution provides a corresponding model for the EIRP and power efficiency of active transmit antennas where the antenna gain is almost meaningless.","PeriodicalId":391546,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010)","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128318621","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

The method of auxiliary sources applied to the analysis of adaptive transverse resonant antennas 将辅助源法应用于自适应横向谐振天线的分析

IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010) Pub Date : 1999-07-11 DOI: 10.1109/APS.1999.789323

G. Bit‐Babik, K. Tavzarashvili, A. Bijamov

引用次数: 4

Conformal aperture coupled microstrip phased array on a cylindrical surface 圆柱表面的共形孔径耦合微带相控阵

IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010) Pub Date : 1999-07-11 DOI: 10.1109/APS.1999.789453

D. Loffler, W. Wiesbeckl, B. Johannisson

引用次数: 10

Efficient and accurate calculation of radar cross section of curved objects by using the conformal finite difference time domain scheme 利用保角时域有限差分格式高效准确地计算曲面目标的雷达截面

IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010) Pub Date : 1999-07-11 DOI: 10.1109/APS.1999.789353

S. Dey, R. Mittra, N. Pegg

引用次数: 1

Modeling the backscattering response of tree trunks at MMW frequencies 树干在毫米波频率下的后向散射响应模拟

IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010) Pub Date : 1999-07-11 DOI: 10.1109/APS.1999.789073

A. El-Rouby, F. Ulaby, A. Nashashibi

引用次数: 1

A combined mode-matching and coupled-integral-equations technique for the design of narrow-band H-plane waveguide diplexers 一种结合模式匹配和耦合积分方程的窄带h平面波导双工器设计方法

IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010) Pub Date : 1999-07-11 DOI: 10.1109/APS.1999.789469

J. Bornemann, A. Amari, R. Vahldieck

{"title":"A combined mode-matching and coupled-integral-equations technique for the design of narrow-band H-plane waveguide diplexers","authors":"J. Bornemann, A. Amari, R. Vahldieck","doi":"10.1109/APS.1999.789469","DOIUrl":"https://doi.org/10.1109/APS.1999.789469","url":null,"abstract":"This paper focuses on a new concept in diplexer design, namely a combination of the standard mode-matching technique (MMT) with the coupled-integral-equations technique (CIET), the latter being used only for the synthesis and analysis of the individual channel filters. Several major advantages are associated with this approach. First, for a full-cycle analysis of a diplexer configuration, the combined method reduces the CPU time significantly compared to ordinary MMT. Secondly, the number of basis functions in the CIET can be reduced during optimization without a shift in frequency as matrix sizes do not depend on the number of modes. In standard MMT algorithms, a reduced number of modes is usually associated with a (sometimes remarkable) shift towards lower frequencies. Thirdly, the CIET-at almost no additional computational cost-allows the extraction of the generalized scattering matrix so that the results are easily interfaced with mode-matching calculations of other components.","PeriodicalId":391546,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129360031","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: 6

Analysis of a charge probe and its response near metallic and dielectric interface 金属-介电界面附近电荷探针及其响应分析

IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010) Pub Date : 1999-07-11 DOI: 10.1109/APS.1999.788277

C. Ozzaim, C. Butler

引用次数: 0

Millimeter-wave dual band bowtie oscillator array 毫米波双波段领结振荡器阵列

IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010) Pub Date : 1999-07-11 DOI: 10.1109/APS.1999.789291

Liang Quan Sun, R. Weikle, A. Zaghloul

引用次数: 1

Inhomogeneous cylindrical waves: an approach to complex beams 非均匀圆柱形波:复杂光束的一种方法

IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010) Pub Date : 1999-07-11 DOI: 10.1109/APS.1999.789575

M.J. Gonzalez Morales, E. Gago-Ribas

引用次数: 2

Effective permittivity and permeability functions of metalo-dielectric photonic band gap materials 金属介电光子带隙材料的有效介电常数和磁导率函数

IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010) Pub Date : 1999-07-11 DOI: 10.1109/APS.1999.788331

C. Kyriazidou, H. Contopanagos, W. Merrill, N. Alexopoulos

{"title":"Effective permittivity and permeability functions of metalo-dielectric photonic band gap materials","authors":"C. Kyriazidou, H. Contopanagos, W. Merrill, N. Alexopoulos","doi":"10.1109/APS.1999.788331","DOIUrl":"https://doi.org/10.1109/APS.1999.788331","url":null,"abstract":"Composite periodic structures, also named photonic band gap (PBG) materials, have attracted a lot of attention due to their controllable dispersive properties that allow a wide range of applications in novel antenna structures and frequency selective surfaces. Up to now, the analysis of PBG structures has been performed by numerical methods. Therefore optimizing the performance of a particular PBG design usually requires a case-by-case, trial and error method which is both CPU-time consuming and physically obscure. In order to bypass these limitations and isolate the response of the medium from the device in use, an effective description for PBG crystals is needed far beyond the quasistatic limit of traditional effective medium theories. Such an effective description for a metalo-dielectric photonic band gap (PBG) material with disk inclusions has been developed analytically. In this paper, we generalize this approach by presenting the effective permittivity and permeability functions for inclusions of a general canonical shape. This is useful in optimising the band gap formation as a function of the shape of the implants. We focus on flat inclusions of infinitesimal thickness that create thin planar geometries which are relevant for microwave devices.","PeriodicalId":391546,"journal":{"name":"IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010)","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1999-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127231166","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