| Abstract | Two planar feeds, a microstrip patch antenna and a printed square loop antenna, are used as primary radiators for illumination of a lens antenna for operation within 26 – 27 GHz band. In isolation, the patch antenna exhibits a gain of 6.9 dBi and fractional impedance bandwidth of 3.7%, while the loop-fed design to a gain of 6.5 dBi and 1.3% bandwidth, both satisfying the −10 dB matching criterion. When these planar antennas are integrated with a spherically shaped dielectric lens, the peak realized gain of the lens antenna is 14.4 dBi for the patch and 13.4 dBi for the loop-fed excitation with corresponding radiation efficiencies of approximately 90% and 79%. The results demonstrate the impact of the radiation patterns of the feeds on lens illumination and provide design guidance for compact high-gain mmWave dielectric lens antennas for 5G and future wireless applications. |
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