Wideband Filtering Omnidirectional Substrate-Integrated Dielectric Resonator Antenna Covering K_u Band

Abstract

A filtering omnidirectional substrate-integrated dielectric resonator antenna (SIDRA) covering K <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">u</sub> band is proposed. With the boundary realized by arrays of nonmetallic vias, the cylindrical SIDRA possesses a high level of integration, a low profile, and easy assembly. The SIDRA operates at the dominant mode fed and coupled by a capacitive loaded probe with a wide band. One array of shorted and another array of open metallic vias are set in the SIDRA to introduce radiation nulls in the low and high stopbands, and to simultaneously generate two radiation pin modes. The two via arrays could further broaden the fractional bandwidth of gain to 49.2%. The proposed SIDRA shows good omnidirectivity and good frequency selectivity with high in-band gain and without the risk of utilizing blind holes. For demonstration, a prototype is designed and fabricated. The simulated and measured results show good agreement.