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Resonant frequencies of stacked circular microstrip antennas 堆叠圆形微带天线的谐振频率
Digest on Antennas and Propagation Society International Symposium Pub Date : 1989-06-26 DOI: 10.1109/APS.1989.134903
A. Tulintseff, S.M. Ali, J. Kong
{"title":"Resonant frequencies of stacked circular microstrip antennas","authors":"A. Tulintseff, S.M. Ali, J. Kong","doi":"10.1109/APS.1989.134903","DOIUrl":"https://doi.org/10.1109/APS.1989.134903","url":null,"abstract":"Using a dyadic Green's function formulation, a rigorous analysis of the two-disk stacked microstrip antenna is performed. Using the vector Hankel transform, the mixed boundary value problem is reduced to a set of coupled vector integral equations. Employing Galerkin's method in the spectral domain, the complex resonant frequencies are calculated as a function of the layered parameters and the ratio of the radii of the two disks. For each mode, the stacked microstrip antenna has dual resonant frequencies associated with the constitutive resonant cavities of the structure.<<ETX>>","PeriodicalId":11330,"journal":{"name":"Digest on Antennas and Propagation Society International Symposium","volume":"80 1","pages":"1134-1137 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84100657","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 integral equation solution for the RCS of large dihedral corner reflectors 大型二面角反射器RCS的积分方程解
Digest on Antennas and Propagation Society International Symposium Pub Date : 1989-06-26 DOI: 10.1109/APS.1989.134826
K. Liu, C. Balanis, T. Griesser
{"title":"An integral equation solution for the RCS of large dihedral corner reflectors","authors":"K. Liu, C. Balanis, T. Griesser","doi":"10.1109/APS.1989.134826","DOIUrl":"https://doi.org/10.1109/APS.1989.134826","url":null,"abstract":"An integral equation solution is obtained by careful application of the moment method and the utilization of the symmetric property. The authors present guidelines that make it possible to avoid redundant computations of the impedance elements and that reduce the computation time as well as the memory space through dedicated matrix computation routines. Computed RCS patterns for a 90 degrees C corner reflector for both vertical and horizontal polarizations are shown and found to compare well with high-frequency predictions and experimental data.<<ETX>>","PeriodicalId":11330,"journal":{"name":"Digest on Antennas and Propagation Society International Symposium","volume":"28 1","pages":"852-855 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80456728","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 of coupling of composite dielectric resonator structure using mode matching technique 基于模式匹配技术的复合介质谐振器结构耦合分析
Digest on Antennas and Propagation Society International Symposium Pub Date : 1989-06-26 DOI: 10.1109/APS.1989.134774
T. Bhattacharjee, X. Tu
{"title":"Analysis of coupling of composite dielectric resonator structure using mode matching technique","authors":"T. Bhattacharjee, X. Tu","doi":"10.1109/APS.1989.134774","DOIUrl":"https://doi.org/10.1109/APS.1989.134774","url":null,"abstract":"A completely shielded dielectric resonator (DR) structure consisting of a DR placed on a dielectric substrate is considered. This configuration is compared with one that has a very-low-dielectric-constant spacer. Particularly, the coupling coefficient between the DR and the microstrip line is analyzed and evaluated by using the mode-matching technique, which is based on dividing the resonator structure into partial regions and regarding them as sections of dielectrically loaded waveguides. The propagation constants are found by solving the resulting transcendental equation by enforcing the continuity of the tangential field components inside each partial region and the condition of vanishing tangential electric field on the metallic enclosure. The numerical evaluation of the coupling is obtained for different DR materials and different substrate thicknesses. The electric field distributions inside the structure with and without the space are also evaluated and compared.<<ETX>>","PeriodicalId":11330,"journal":{"name":"Digest on Antennas and Propagation Society International Symposium","volume":"84 1","pages":"659-662 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80660762","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
Realization of wideband characteristics for a spiral antenna backed by a conducting plane reflector 导电平面反射器后置螺旋天线宽带特性的实现
Digest on Antennas and Propagation Society International Symposium Pub Date : 1989-06-26 DOI: 10.1109/APS.1989.134953
H. Nakano, H. Soga
{"title":"Realization of wideband characteristics for a spiral antenna backed by a conducting plane reflector","authors":"H. Nakano, H. Soga","doi":"10.1109/APS.1989.134953","DOIUrl":"https://doi.org/10.1109/APS.1989.134953","url":null,"abstract":"It is shown that backing a spiral antenna with a conducting plane reflector narrows the inherent wideband radiation characteristics of the spiral by distorting the current distribution. When a small, circular conducting plane is inserted between the spiral and the plane reflector, the distorted current distribution can be changed to a traveling wave. This traveling-wave current has a decaying amplitude, leading to a desirable radiation beam of good circular polarization. The frequency band for CPW (circularly polarized wave) radiation can be extended from 1:1.18 without the small disk 1:1.42 with the disk.<<ETX>>","PeriodicalId":11330,"journal":{"name":"Digest on Antennas and Propagation Society International Symposium","volume":"12 1","pages":"1312-1315 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1989-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83134821","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
Mesh pillow in deployable front-fed umbrella parabolic reflectors 网格枕头在可展开的前馈伞形抛物面反射器
Digest on Antennas and Propagation Society International Symposium Pub Date : 1989-06-26 DOI: 10.1109/APS.1989.134664
A. Prata, W. Rusch, R.K. Miller
{"title":"Mesh pillow in deployable front-fed umbrella parabolic reflectors","authors":"A. Prata, W. Rusch, R.K. Miller","doi":"10.1109/APS.1989.134664","DOIUrl":"https://doi.org/10.1109/APS.1989.134664","url":null,"abstract":"An analytical solution for the umbrella reflector surface shape, including the pillowing contribution, is presented. The solution is simple and sufficiently accurate for most antenna applications, and apart from being useful as a design tool, it can be easily incorporated into an existing computer code, allowing for more realistic evaluations of the umbrella reflector electrical characteristics. The analytical solution was tested by numerically solving the equations using a successive overrelaxation procedure. The gain degradation and the gore-related sidelobes clearly show the significance of pillowing on the antenna radiation characteristics.<<ETX>>","PeriodicalId":11330,"journal":{"name":"Digest on Antennas and Propagation Society International Symposium","volume":"1997 1","pages":"254-257 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1989-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82491922","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
Polarimetric radar detection of point targets in a forest environment 森林环境中点目标的极化雷达探测
Digest on Antennas and Propagation Society International Symposium Pub Date : 1989-06-26 DOI: 10.1109/APS.1989.134809
M. Whitt, F. Ulaby
{"title":"Polarimetric radar detection of point targets in a forest environment","authors":"M. Whitt, F. Ulaby","doi":"10.1109/APS.1989.134809","DOIUrl":"https://doi.org/10.1109/APS.1989.134809","url":null,"abstract":"The use of polarimetric radar to detect point targets in a forest clutter environment was evaluated using a truck-mounted L-band polarimetric scatterometer. The polarimetric propagation characteristics of a dense canopy of red pines were measured. A simple polarimetric model was then used to simulate the polarimetric response of other point targets in the same forest environment. The simulation makes it possible to obtain the polarimetric response for a variety of point targets in the same forest environment without the need for detailed polarimetric measurements of each target. Several polarimetric and traditional (amplitude-only) detection schemes were used with the simulated data to evaluate the enhancement in target detection attained with polarimetric techniques as opposed to traditional techniques.<<ETX>>","PeriodicalId":11330,"journal":{"name":"Digest on Antennas and Propagation Society International Symposium","volume":"76 1","pages":"788-791 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82532615","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
Slot couplers for feeding branch waveguides of a planar slot array 用于馈电平面槽阵列分支波导的槽耦合器
Digest on Antennas and Propagation Society International Symposium Pub Date : 1989-06-26 DOI: 10.1109/APS.1989.134781
S. Rengarajan
{"title":"Slot couplers for feeding branch waveguides of a planar slot array","authors":"S. Rengarajan","doi":"10.1109/APS.1989.134781","DOIUrl":"https://doi.org/10.1109/APS.1989.134781","url":null,"abstract":"The characteristics of centered-inclined, longitudinal/transverse, and compound slot couplers for slot array applications are studied. The variation of normalized resonant length as a function of slot offset and tilt is shown. Both mod S/sub 11/ mod at resonance and the phase of mod S/sub 31/ mod at resonance are shown as functions of offset and tilt.<<ETX>>","PeriodicalId":11330,"journal":{"name":"Digest on Antennas and Propagation Society International Symposium","volume":"117 1","pages":"682-685 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80997388","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
Scattering by arbitrary-shaped over-moded waveguides 任意形状过模波导的散射
Digest on Antennas and Propagation Society International Symposium Pub Date : 1989-06-26 DOI: 10.1109/APS.1989.134854
C. Ryan
{"title":"Scattering by arbitrary-shaped over-moded waveguides","authors":"C. Ryan","doi":"10.1109/APS.1989.134854","DOIUrl":"https://doi.org/10.1109/APS.1989.134854","url":null,"abstract":"The first six TE modes were used to compute the RCS (radar cross section) for a shorted trapezoidal waveguide. It was found that the individual-mode RCS patterns did not agree with measured RCS patterns, and it was necessary to use a combination of modes to obtain satisfactory results. The calculated domain single-mode azimuth-plane RCS and measured RCS were compared. This single-mode calculation underestimates the measured RCS. The measured RCS data, taken over a frequency range of 2 to 18 GHz and an angular range of +/-70 degrees , exhibit fluctuations that indicate phase interference between multiple waveguide modes. Since the precise relative phase between the higher order modes are not usually known, a statistical approach was used to compute a mean RCS and standard deviation. A comparison between the statistically calculated RCS and the fluctuating measured data between 6.75 and 6.95 GHz is shown.<<ETX>>","PeriodicalId":11330,"journal":{"name":"Digest on Antennas and Propagation Society International Symposium","volume":"10 1","pages":"954-957 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90449187","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
Strip stacked-element phased arrays 条形叠合元相控阵
Digest on Antennas and Propagation Society International Symposium Pub Date : 1989-06-26 DOI: 10.1109/APS.1989.134839
H. Stalzer, Y. Lubin, A. Hessel, J. Shmoys
{"title":"Strip stacked-element phased arrays","authors":"H. Stalzer, Y. Lubin, A. Hessel, J. Shmoys","doi":"10.1109/APS.1989.134839","DOIUrl":"https://doi.org/10.1109/APS.1989.134839","url":null,"abstract":"Strip elements in a stacked configuration are used to illustrate the improvement in bandwidth over a 45 degrees E-plane scan sector that can be expected from the scan-dependent, double-tuned nature of the configuration. The curves of active resistance versus frequency are shown to have considerable value. The resonant peaks in these curves are shown to arise from individual resonances of single-element arrays, which form the basis for a design procedure. Surface wave resonances are accounted for, but their effect is limited by placing them near the endfire grating lobe frequency. A bandwidth of 1.85 for an E-plane scan from broadside to 45 degrees in a matched configuration has been shown as compared with 1.25 for simple strips. It is conjectured that increased scan and bandwidth would also be achieved by the stacking of rectangular patch elements although the bandwidth would be less than that for strip arrays.<<ETX>>","PeriodicalId":11330,"journal":{"name":"Digest on Antennas and Propagation Society International Symposium","volume":"61 1","pages":"898-901 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1989-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89967567","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
Array thinning in phased arrays using dual mode horns 使用双模喇叭的相控阵阵列减薄
Digest on Antennas and Propagation Society International Symposium Pub Date : 1989-06-26 DOI: 10.1109/APS.1989.134990
H. Ragheb, L. Shafai
{"title":"Array thinning in phased arrays using dual mode horns","authors":"H. Ragheb, L. Shafai","doi":"10.1109/APS.1989.134990","DOIUrl":"https://doi.org/10.1109/APS.1989.134990","url":null,"abstract":"The authors investigate a new concept in array design, where the level of the grating lobes is controlled by the element pattern. For the array elements circular horns are selected. In standard arrays these horns operate in the TE/sub 11/ mode and beam scanning is achieved fully by element phasing. In the present case, each array element operates in the first two TE/sub 11/ and TE/sub 21/ modes and the element pattern is shaped to place a null in the direction of the grating lobes. Thus, the interelement spacing can be increased beyond that of normal arrays, without a serious pattern degradation due to the appearance of the grating lobes. Also, the array elements in the present study are assumed to be circularly polarized.<<ETX>>","PeriodicalId":11330,"journal":{"name":"Digest on Antennas and Propagation Society International Symposium","volume":"16 1","pages":"1447-1450 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1989-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89481070","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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