Design of W-band Microstrip Antenna Array

Abstract

A $8\times 8$ microstrip antenna array for W-band application is presented in this paper. The radiation element of the antenna array is rectangular microstrip patch fed from the non-radiating edge. A 1 to 64 microstrip line power divider is proposed to feed the $8 \times 8$ radiation patches. The radiation elements and the microstrip line feed network are on the same layer, so the antenna PCB only has two layers. By optimizing design the radiation patches and feed network, the antenna array shows good performance at W-band with the center frequency 94GHz. The microstrip antenna array and a WR10 waveguide to microstrip transition structure are fabricated and measured. The measured results show that the antenna array has a −10dB bandwidth of 7% and a peak gain of 21.4dBi at 94 GHz.