High-Efficiency Dual-Polarized Patch Antenna Array with Common Waveguide Feed

Conference: GeMiC 2014 - German Microwave Conference
03/10/2014 - 03/12/2014 at Aachen, Germany

Proceedings: ITG-Fb. 246: GeMiC 2014

Pages: 3Language: englishTyp: PDF

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Vilaltella, Robert; Hesselbarth, Jan; Barba, Hernán (University of Stuttgart, Germany)

A concept for a dual-polarized patch antenna array with large bandwidth and high efficiency is proposed. A short overmoded waveguide section is connected to a square feed waveguide on one side, and to the common groundplane of a 2x2 or a 3x3 patch array on the other side. Each square-shaped patch is coupled to the waveguide by crossed slots in the groundplane. The coupled resonances of the patch and the slot result in large impedance bandwidth (at -10 dB) of more than 20%. Prototypes are realized at X band. At 9 GHz, the 2x2 array has a measured gain of 13.6 dBi, whereas the 3x3 array shows 15.2 dBi gain. Simulated efficiency of the 3x3 array is 98.5%.