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1988 IEEE AP-S. International Symposium, Antennas and Propagation最新文献

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Measured antenna performance of an EHF hybrid scan array antenna for MILSATCOM applications 用于军事卫星通信应用的EHF混合扫描阵列天线性能测量
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94025
J. Pedersen
{"title":"Measured antenna performance of an EHF hybrid scan array antenna for MILSATCOM applications","authors":"J. Pedersen","doi":"10.1109/APS.1988.94025","DOIUrl":"https://doi.org/10.1109/APS.1988.94025","url":null,"abstract":"Advances in the development of a hybrid scan array antenna that positions its beam by a combination of mechanical antenna motion and electronic scanning are reported. The antenna is intended as a cost-effective alternative to conformal fully phased arrays for airborne satellite communications terminals where radar cross section (RCS) or low aerodynamic drag are key design issues. The EHF design uses a tilted array located below the level of the fuselage. It is protected by a radome which is contoured to the aircraft surface. The installation is flush, meeting performance from zenith to 20 degrees above the horizon.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130989974","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
A study of two-dimensional cylinders illuminated by TE polarized microwaves using the k-space algorithm 用k空间算法研究TE极化微波照射二维圆柱体
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.93996
W. E. Boyse, W. Kennedy
{"title":"A study of two-dimensional cylinders illuminated by TE polarized microwaves using the k-space algorithm","authors":"W. E. Boyse, W. Kennedy","doi":"10.1109/APS.1988.93996","DOIUrl":"https://doi.org/10.1109/APS.1988.93996","url":null,"abstract":"One comparison of the numerical modeling techniques applied to the absorption of electromagnetic energy by organic tissues is that of D.T. Borup et al. (IEEE Transaction and Microwave Theory and Techniques, vol.T-MTT-35, p.383-395, 1987) that compared the fast Fourier transform-conjugate-gradient method (FFT-CGM) with the finite-element-time-domain methods. The authors expand and elaborate the findings of Borup et al. (BSG) for the case of TE-polarized illumination. The solution technique in this comparison, which is referred as the k-space algorithm, differs in (at least) two ways from the FFT-CGM employed in the BSG study. First, all of the integrals arising from the application of the method of moments formalism are transformed to line integrals along the cell boundaries. Seconds, the system of linear equations arising from the application of the method of moments is solved by iterated minimization of the squared error using several variational functions. Considering TE polarization of the illuminating plane wave, the effect of increasing the number of points in the mesh on the convergence of the solution is presented.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127956280","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
Incoherent microwave imaging using frequency diversity technique 频率分集技术的非相干微波成像
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94201
T. Chu, Wei-Kung Deng
{"title":"Incoherent microwave imaging using frequency diversity technique","authors":"T. Chu, Wei-Kung Deng","doi":"10.1109/APS.1988.94201","DOIUrl":"https://doi.org/10.1109/APS.1988.94201","url":null,"abstract":"The analytical and numerical results of the microwave tomographic image reconstruction of a three-dimensional incoherent source using the frequency diversity technique and the projection-slice theorem are presented. The results demonstrate that a large vector-k-space volume of the far field mutual coherence function can be synthesized by an incoherent microwave imaging system using a frequency diversity technique, and the tomographic image of a 3-D incoherent source can then be reconstructed based on the projection-slice theorem.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125553401","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
Design of cross-polarization suppressed waveguide array for desired radiation pattern 期望辐射方向图的交叉极化抑制波导阵列设计
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.93991
G. Raju, A. Chakraborty, B. Das
{"title":"Design of cross-polarization suppressed waveguide array for desired radiation pattern","authors":"G. Raju, A. Chakraborty, B. Das","doi":"10.1109/APS.1988.93991","DOIUrl":"https://doi.org/10.1109/APS.1988.93991","url":null,"abstract":"A general synthesis method is discussed for the realization of any desired radiation pattern using either an array of waveguide radiators excited through slot-coupled junctions, or an array of slots radiating into free space. An example is presented for realizing the amplitude distribution obtained by following T.T. Taylor's (1955) method of synthesis for a 28-dB sidelobe level for a five-element array.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126429352","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
Comments on the 'Head model' 对“头部模型”的评论
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94324
A. Schneider
{"title":"Comments on the 'Head model'","authors":"A. Schneider","doi":"10.1109/APS.1988.94324","DOIUrl":"https://doi.org/10.1109/APS.1988.94324","url":null,"abstract":"Recently, several investigators have used a propagation model attributable to H.T. Head (1960) for predicting radio transmission loss on ground-to-ground paths obstructed by trees. A re-examination is conducted of Head's data, which are compared with analogous data taken by J.S. McPetrie and L.H. Ford (1946). It is concluded that there is no basis for applying the Head model to transmission paths within the woods or, to any tree-obstructed transmission paths when the antennas are sited below treetop level.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122234825","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
Orthogonal decomposition of external oscillation 外振荡的正交分解
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94167
H. Xu, W. Wang
{"title":"Orthogonal decomposition of external oscillation","authors":"H. Xu, W. Wang","doi":"10.1109/APS.1988.94167","DOIUrl":"https://doi.org/10.1109/APS.1988.94167","url":null,"abstract":"External oscillation is decomposed orthogonally using the theory of differential geometry. It is shown that the SEM (singularity expansion method) poles of a smooth scatterer in three-dimension have three indexes (l, m, n). The l indicates the order of the creeping wave on the surface, and m and n describe the modes of the standing waves in two orthogonal directions. It is noted that the SEM poles of a sphere have two indexes (l, n); for a smooth scatterer, the index number of SEM poles is the same as the dimension number of the oscillation trajectory, but for a scatterer having nonsmooth points on the trajectory the index number of SEM poles will be larger, because the diffraction fields caused by these points have a number of orders.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"220 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114107464","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
Canonical cases of antennas radiating in presence of structures 天线在有结构的情况下辐射的典型情况
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94156
B. Audone, M. Balma
{"title":"Canonical cases of antennas radiating in presence of structures","authors":"B. Audone, M. Balma","doi":"10.1109/APS.1988.94156","DOIUrl":"https://doi.org/10.1109/APS.1988.94156","url":null,"abstract":"Summary form only given. A UTD (uniform geometrical theory of diffraction) computer code has been developed to take into account higher-order field contributions such as double-diffracted fields among plates and cylinders for the location of antennas on an aircraft structure. The experimental verification of the code in canonical cases has been carried out. The radiation/scattering of complex shapes can be obtained by simulating these structures with simple shapes that provide a sufficiently accurate representation of the dominant reflection and diffraction effects. Various cases have been studied by comparing experimental and theoretical results.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116268265","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
Progress toward a benchmark solution for 3-D, perfectly conducting scatterers with edges and corners 3-D的基准解决方案的进展，完美地传导有边缘和角的散射体
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94352
A. Yaghjian, M. Coté, M. B. Woodworth
{"title":"Progress toward a benchmark solution for 3-D, perfectly conducting scatterers with edges and corners","authors":"A. Yaghjian, M. Coté, M. B. Woodworth","doi":"10.1109/APS.1988.94352","DOIUrl":"https://doi.org/10.1109/APS.1988.94352","url":null,"abstract":"The authors present the predicted and measured E-plane, H-plane, and 45 degrees -plane scattered fields from the perfectly conducting cube for broadside plane-wave incidence. Although the scattering patterns are obtained for a plane-wave incident broadside upon the front face of the cube, the magnetic-field integral equation solutions can easily accommodate plane-wave illumination from an arbitrary direction, or illumination by an incident field other than a plane wave. However, the uniform high-frequency solution is valid only for broadside plane-wave incidence.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115869145","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
Time-domain techniques for the measurement of narrow-bandwidth antenna parameters 窄带天线参数测量的时域技术
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94057
E.N. Clouston, S. Evans
{"title":"Time-domain techniques for the measurement of narrow-bandwidth antenna parameters","authors":"E.N. Clouston, S. Evans","doi":"10.1109/APS.1988.94057","DOIUrl":"https://doi.org/10.1109/APS.1988.94057","url":null,"abstract":"Time-domain measurements are shown to be feasible even within narrow-bandwidth antennas and can be used to separate the properties of resonant slots from the effects of the edges of the ground plane around them. A time-domain test range that alloys radiation patterns to be measured as if in an infinite ground plane is highlighted. Mutual coupling results obtainable from time-domain measurement of the coupled signal between two slots are noted.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"18 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120999674","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: 5
Finite element solution of unbounded electromagnetic field problems 无界电磁场问题的有限元解
1988 IEEE AP-S. International Symposium, Antennas and Propagation Pub Date : 1988-06-06 DOI: 10.1109/APS.1988.94294
D. Feng, Gaofeng Wang
{"title":"Finite element solution of unbounded electromagnetic field problems","authors":"D. Feng, Gaofeng Wang","doi":"10.1109/APS.1988.94294","DOIUrl":"https://doi.org/10.1109/APS.1988.94294","url":null,"abstract":"A finite-element solution for an unbounded region is used to solve vector field problems in a three-dimensional space. The unbounded region is divided into two parts, a local dielectric space and free space. The electromagnetic field equations are solved directly by a weighted residual technique using finite elements, with integral equations as the constraints of the differential equations. The numerical results of the internal field distribution are given to show the accuracy in comparison with other calculations.<<ETX>>","PeriodicalId":211271,"journal":{"name":"1988 IEEE AP-S. International Symposium, Antennas and Propagation","volume":"176 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121037594","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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