In this paper, a feed antenna for dielectric spheres lens in the Ka band, which is a circularly polarized short dielectric rod antenna, is presented. The structure combines with circular polarizer and short dielectric rod antenna skilfully. The circular polarizer with dielectric septum realizes the circular polarization. The short dielectric rod antenna achieves the high gain. Compared with the long dielectric rod antenna, the short dielectric rod antenna in the design has realized miniaturization. The antenna is characterized by simple structure, manufacture and test easily. In addition, the performance of the antenna as a feed for the dielectric sphere lens antenna is also studied, whose simulated gain with a quarter wavelength choke is 20.369 dB and beam width is 16°, which show that the antenna is an excellent feed antenna.
Key words: Ka band, dielectric spheres lens, circularly polarized, short dielectric rod antenna, a quarter wavelength choke.
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