A Compact Wideband Dielectric Resonator Antenna With Filtering Response

This paper presents a wideband filtering dielectric resonator antenna (FDRA) with compact structure and simple feed structure. A vertical metal strip and a thin rectangular closed ring are used to feed the DRA, exciting in its TE111 mode with three adjacent frequencies. Therefore, the antenna obtains a wide bandwidth of 24.2% and an average realized gain of 5.6 dBi. Meanwhile, due to the cross-coupling between two feed structures, two radiation zeros are created beside the edges of the passband, which enables the FDRA to obtain an out-of-band suppression of better than 15 dB. Finally, a wideband FDRA is obtained without any complex feed structure.