A Compact Filtering Antenna Array

In this paper, a 4 × 4 microstrip filtering antenna array with compact size is presented. The proposed antenna array consists of three metal layers which are bonded by two substrates. The radiation patches are placed on the top layer which are fed by the feeding network on the bottom layer through the slot on the middle layer. There are no extra filtering elements in the antenna array therefore miniaturization is achieved. The return loss of the proposed antenna array is better than 10dB, and the radiation suppression is higher than 20 dB at the stopband, and the maximum gain in the passband is 14 dB.