Abstract
Abstract—A novel two-dimensional elliptical lens monopulse antenna at millimeter-wave frequencies is presented using the technique of dielectric-filled parallel plates where TE10 mode propagates. A cavity-backed aperture-coupled elliptical patch antenna array with sum/difference ports is located at the back of the elliptical lens as the feed antenna. The lens antenna is designed, fabricated and tested at 35 GHz. Measurements show that clean and symmetrical fan-beam patterns are realized for both the sum and the difference beams. The measured 3-dB Eand H-plane beamwidths of the sum pattern are 5.3◦ and 37◦, respectively. A gain of 16.7 dBi is realized for the sum beam (86% radiation efficiency), while a deep null of −32.4 dB is achieved for the difference beam. In addition, a 10-dB impedance bandwidth of 7.1% is measured for both the sum and difference beams.
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