A Simple π-Shaped Printed Microstrip Filtering Monopole Antenna

In this paper, a π-shaned printing monopole antenna with a total antenna size of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\boldsymbol{24\times 28\times 0.544\ mm^{3}}$</tex> is introduced. The radial antenna is improved from T shape to Π shape. The T-shape operates at 6.11 ~ 6.26GHz, and the improved π shape operates at 6.11 ~ 6.28GHz. The voltage standing wave ratio is improved from 1.17:1 to 1.04:1. The peak gain of the antenna is improved from 1.70dBi to 1.89dBi, and the radiation efficiency of the antenna is improved from 92% to 99%.