volume | PIER Journals

Abstract

To address the issues of narrow gain bandwidth and severe element coupling faced by traditional Fabry-Perot resonant antennas in phased array feed systems, this paper proposes a decoupling design method based on highly optimized resonant mode height. By analyzing electric field distributions and coupling mechanisms under multi-feed conditions, an improved resonator height calculation formula suitable for phased array feeds is derived, achieving mutual suppression of energy between reflected wave coupling and inter-element coupling. A 2 × 2 microstrip antenna array was employed as the feed source. Combined with a multilayer positive phase gradient partially reflective surface, a Fabry-Perot antenna prototype operating at 28 GHz was designed and fabricated. Simulated and experimental results demonstrate that compared to conventional designs, this antenna achieves a maximum gain at 28 GHz increased from 21.80 dBi to 23.15 dBi, with the 3-dB gain bandwidth expanded from 1350 MHz to 1730 MHz. This study provides an effective approach for achieving a broadband high-gain design in phased array-fed Fabry-Perot resonant antennas.

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Dr. Zechen Li

Professor Zibin Weng

Dr. Yahong Li

Dr. Youqian Su

Dr. Jingnan Guo