SWB Antenna Exhibits Impedance Bandwidth Beyond 25:1

NUMBEROUS SUPER-WIDEBAND (SWB) antennas have been developed with impressive return loss, radiation pattern, and gain. Yet such performance characteristics do not reveal the SWB antennas' ability to transceive pulse signals. Antenna applications also are impacted by phase variation of the far field, transfer function, and transient response in the time domain. Keeping these aspects in mind, a printed SWB antenna has been proposed and studied by Yuandan Dong, Wei Hong, Leilei Liu, Yan Zhang, and Zhenqi Kuai from China's Southeast University.

The proposed antenna comprises a cornerrounded groundplane, tapered microstrip feeder, and novel radiating path that is made by one half-disk and one half-ellipse structure. With this configuration, a ratio impedance bandwidth of more than 25:1 can be achieved with a voltage standing wave ratio (VSWR) of less than 2:1. Yet the omnidirectional radiation pattern in the H-plane was only observed in the low frequency from 640 MHz to about 2 GHz. The antenna system's time-domain behavior was impacted by the operating bandwidth as well as the source pulse and antenna orientations. See "Performance Analysis of a Printed Super-Wideband Antenna," Microwave And Optical Technology Letters, April 2009, p. 949.

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