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Compact cavity-backed patch antenna with wideband bandwidth using parasitic patch

A compact cavity-backed wideband patch antenna has been proposed in this paper. The wideband bandwidth of the antenna has inherited from the planar omni-directional monopole antenna. Furthermore, directional patterns have been obtained by integrating a compact cavity. A parasitic patch has also employed in the microstrip-fed slotted antenna to enlarge the impedance bandwidth. The obtained results have confirmed that the presented antenna can achieve an impedance bandwidth from 4.2 to 7.8 GHz with a relative bandwidth of 60%. The realized antenna gain at boresight varies from 6.1 to 5.6 dBi over the operating frequency band. It is also worthwhile to mention that, the whole height of the antenna is only 7.7 mm which is around 0.1λ where λ is the wavelength at the lowest frequency. Due to its advantages of the wideband bandwidth, stable directional patterns and low profile, the antenna is promising for applications in wideband imaging and radar systems.