A H-shaped Dual-Band Microstrip Patch Antenna with Large Frequency Ratio under Dual Modes

In this paper a novel design of microstrip patch antenna (MPA), which consists of two radiation patches and a transmission line, is presented to enlarge the frequency ratio (FR). The H-shaped antenna is fully analyzed under two resonant modes via transmission line model. It indicates that the FR among TM
₁₀
and TM
₃₀
can be entirely dominated by the electrical length and impedance ratios between radiating patches and transmission line. The width of the radiation patch is progressively enlarged to move the TM
₃₀
further to TM
₁₀
. The prototype antenna is designed, fabricated, and tested. Experiment results show that the antenna has achieved a maximum FR of 6.52, which ranges from 0. 89GHz to 5. 80GHz, while keeping low-cross polarization and stable radiation pattern.