A simple design method for broadband planar antennas

摘要

A simple process for the design of broadband planar antennas is presented for base station applications. The process is based on a square patch above a ground plane. Only three geometric parameters are involved in the design of a dual-polarized broadband planar antenna, including the width (W-s) of the square patch, a trimming angle (theta) of the square, and the height (H) of the patch above the ground plane. By adjusting the critical parameters theta and H, an impedance bandwidth of 50% for return loss (RL) >15 dB is achieved with an isolation of higher than 35 dB. The bandwidth of the broadband planar antenna is enhanced to 67% by etching four Gamma slots on the square patch. The operating mechanisms of these broadband antennas are analyzed and verified by simulation and experiment.

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