Comparison of induced current and aperture field integrations for an offset parabolic reflector

Abstract

a = 10 cm, e? = 2.32 AND h = 0.159 cm Mode ? , O , -l Y J i -2 1M2,0,-2 ?M2, 1 -3 1M3,0,-3 1280 2242 2550 3400 3824 the correction factor for the resonant frequencies of the-equilateral triangular patch antenna consists of a simple replacement af the side1ength.a by its effective value given by (2) while E , is unchanged. This is similar to that of the circular disk and different from that of the annular ring. REFERENCES [l] L. experiment on the annularring microstrip antenna," Ann. Telecommun., tome 40, nos. 9-10, [4] M. V. Schneider, "Microstrip lines for microwave integrated circuits," , "Planar t r i a n g u l a r resonator with magnetic walls," IEEE Trans. Microwave Theory Tech., vol. MTT-[6] I.Abstract-The fields predicted by integration of the physical optics induced currents on the reflector (ICM) and the geometrical optics Manuscript aperture fields (AFM) on the surface that caps the reflector are compared numerically for offset parabolic reflectors. It is found that the AFM solutions are very close to ICM solutions for the main beam and the first few sidelobes but discrepancy remains for the far-out sidelobes. This discrepancy is found to come mainly from the difference of polarization matrix for each method.