Abstract
A highly selective filtering dielectric resonator antenna (FDRA) is proposed to fuse the filter and antenna. The microstrip slot structure is used to feed FDRA which excite the TE <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">111</inf> and TE <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">311</inf> modes, and achieve dual-band radiation. Then four radiation nulls are introduced to achieve high selectivity. And two radiation nulls at the edge of the passband are generated by adjusting the length of the microstrip line. In the higher frequency band, the electric field of TE <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">311</inf> mode is opposite to the electric field of the feed slot to produce an additional radiation null, which further increases the roll-off date. In addition, by introducing a folded V-shaped defect ground structure (DGS), a radiation null is introduced between the two radiation frequency bands to improve the suppression level between them. The simulation results show that the proposed FDRA has good dual-frequency radiation performance and high out-of-band suppression.
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