volume | PIER Journals

Abstract

In this paper, a compact antenna with wideband and wide beam is proposed. It is composed of a rectangular patch etched on a substrate, a feeding probe, two metal columns, and a ground plane. By inserting air gap between the substrate and the ground, as well as using the coupled feeding, wide impedance bandwidth is obtained. By inserting two metal columns on the two sides of the patch for inducing longitudinal current, the HPBW of the antenna in the operation bandwidth can be widened. Design evolutions are provided for the proposed antenna, and main parameters are investigated for obtaining the adjusting rules. For validation, a prototype operating at 5.8 GHz is fabricated, where the dimension is only 0.31λ₀ × 0.11λ₀ × 0.11λ₀. Measurement results show that a fractional bandwidth of 24% is achieved for |S₁₁| < -10 dB. In this bandwidth, the measured gain is larger than 2.5 dBi with a maximum gain of 3.5 dBi. At E-plane, the measured HPBWs are in the range of 130°~190°, and the values are around 120° at H-plane.

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Dr. Da Yu

Dr. Hongmei Liu

Dr. Shuo Li

Dr. Zhongbao Wang

Prof. Shao-Jun Fang