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Broadband Monopolar Microstrip Patch Antenna With Shorting Vias and Coupled Ring

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4 Author(s)
Juhua Liu ; Dept. of Electron. & Commun. Eng., Sun Yat-sen Univ., Guangzhou, China ; Shaoyong Zheng ; Yuanxin Li ; Yunliang Long

A center-fed circular patch antenna with shorting vias and a coupled annular ring is proposed. With a low-profile configuration, the antenna provides a wide bandwidth by merging three resonant modes, including the TM02 mode of the circular patch, the TM01 mode generated by the shorting vias, and the TM02 mode of the coupled annular ring. The antenna operating in these modes would produce an omnidirectional pattern in the horizontal plane similar to that generated by a monopole antenna. A reduced structure is used to simplify the simulation in optimizing the bandwidth of the antenna. Measured results show that the antenna achieves a bandwidth of 27.4% for a profile of 0.029 wavelengths and has a gain of about 6 dBi.

Published in:

IEEE Antennas and Wireless Propagation Letters  (Volume:13 )