Design of a Compact Unified SIW Cavity Filtenna Module for Antenna Array Application

The design of multilayer SIW cavity-fed filtenna is presented. The proposed filtenna can be used as a unified module in antenna arrays structure. It consists of 3-pole bandpass filter with slot antenna positioned centrally within the top module surface. The modules aperture dimensions λ0/2×λ0/2 in conjunction with SMA feeding port located on the bottom filtenna surface allow to implement an antenna array of different configurations. This approach allow to greatly simplify the feeding and matching scheme of the array. This module is designed to operate 2.655 GHz central frequency with a 70 MHz bandwidth. The procedure of the filtenna design is described in detail The proposed filtenna is fabricated and tested. Simulation and measurement results show a good agreement. The measurements demonstrate the maximum measured gain of the prototype is 3.64 dBi with a small variation in the passband.