Pub Date : 1980-06-02DOI: 10.1109/APS.1980.1148252
J. Mink
The frequency characteristics of circular ring microstrip antennas were obtained as a function of relative aperture radius. In all cases the resonant frequency was normalized to that of an ideal disk microstrip antenna with the same radius, and assumed magne tic wall boundary conditions. Since, at this time, an exact value for the complex wall admittance is not known, an equivalent admittance was derived for each of several commonly used models. This admittance was then used as the boundary condition for the computation of the resonant frequency as a function of relative aperture radius. Results of these calculations are shown; also shown is the comparison with experiment.
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Pub Date : 1980-06-02DOI: 10.1109/APS.1980.1148234
I. Bahl, P. Bhartia
The feasibility of freguency scanning and dielectric scanning {changing the direction of the bearn by varying the relative permittivity of the electrically controlled liquid artificial dielectric medium) of a leaky-wave antenna using rodded artificial dielectric is investigated theoretically. From Table l it is noted that for small scan ranges, the frequency scanned antenna (FSA) has less variation in the bearnwidth as compared to the dielectric-scanned antenna (DSA) . The gain of a dielectric-scanned antenna is greater by about 0.8 dB over the frequency-scanned antenna. Efficiency is more or less the same for bath the types in the case of small scan ranges as well as for large scan ranges. For large scan range (lO°-55°) the maximum and minimum gains of DSA are 21.0 dB and 19.2 dB respectively cornpared to 20.2 dB and 17.0 dB for the FSA. It is thus noted that the FSA has more variation in the gain of the antenna in comparison to the DSA. Variation in the beamwidth is almost the same for bath techniques, although the DSA has about 15% less beamwidth than the FSA. Thus it may be concluded that for large scan ranges, a dielectric-scanned antenna has better scanning characteristics than a frequency-scanned antenna. It is also found that the present structure (AD) is rouch more dispersive than the insular guide studied for frequency scanned arrays, silicon waveguide with metallic stripe perturbations used for frequency scanned antenna and inverted strip dielectric waveguide, when the same dielectric material is used.
{"title":"Leaky-wave antennas using artificial dielectrics at millimiter wave frequencies","authors":"I. Bahl, P. Bhartia","doi":"10.1109/APS.1980.1148234","DOIUrl":"https://doi.org/10.1109/APS.1980.1148234","url":null,"abstract":"The feasibility of freguency scanning and dielectric scanning {changing the direction of the bearn by varying the relative permittivity of the electrically controlled liquid artificial dielectric medium) of a leaky-wave antenna using rodded artificial dielectric is investigated theoretically. From Table l it is noted that for small scan ranges, the frequency scanned antenna (FSA) has less variation in the bearnwidth as compared to the dielectric-scanned antenna (DSA) . The gain of a dielectric-scanned antenna is greater by about 0.8 dB over the frequency-scanned antenna. Efficiency is more or less the same for bath the types in the case of small scan ranges as well as for large scan ranges. For large scan range (lO°-55°) the maximum and minimum gains of DSA are 21.0 dB and 19.2 dB respectively cornpared to 20.2 dB and 17.0 dB for the FSA. It is thus noted that the FSA has more variation in the gain of the antenna in comparison to the DSA. Variation in the beamwidth is almost the same for bath techniques, although the DSA has about 15% less beamwidth than the FSA. Thus it may be concluded that for large scan ranges, a dielectric-scanned antenna has better scanning characteristics than a frequency-scanned antenna. It is also found that the present structure (AD) is rouch more dispersive than the insular guide studied for frequency scanned arrays, silicon waveguide with metallic stripe perturbations used for frequency scanned antenna and inverted strip dielectric waveguide, when the same dielectric material is used.","PeriodicalId":310469,"journal":{"name":"1980 Antennas and Propagation Society International Symposium","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1980-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114846263","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}
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