A Wideband Filtering Antenna Based on Dual Parasitic Magnetic Dipoles

This paper proposes a low-profile patch antenna with wide bandwidth and filtering response. The antenna is composed of a shorted pins-loaded circular patch and two parasitic magnetic dipoles. The parasitic magnetic dipoles can not only enhance the impedance bandwidth, but also improve the low- and high-frequency band edge roll-off. Besides, two radiation nulls at either the upper or lower band edge of the reflection curve are obtained. Simulated results show that the antenna has a -10-dB impedance bandwidth of 4.62 ~ 5.74 GHz and an out-of-band suppression higher than 13.4 dB.