Compact low‐temperature co‐fired ceramic filtering antenna array with high selectivity exploiting substrate integrated waveguide for 5G

Abstract

In this study, a compact filtering 2 × 2 array antenna with high selectivity utilizing substrate integrated waveguide (SIW) is presented. The proposed antenna structure is mainly composed of coplanar waveguide feeding structures, SIW filtering cavities, and four radiation patches by low‐temperature co‐fired ceramic technology. The designed antenna not only achieves the advantages of high selectivity but also realizes a miniaturized volume of 12 × 12 × 1.18 mm3. The simulated and measured results show that the filtering antenna achieves a center frequency of 28 GHz and has a 10.7% fractional bandwidth with a 10.8 dB antenna gain.