Design of 94GHz series-fed microstrip antenna array

A 8×8 microstrip antenna array for W-band application is presented in this paper. The Taylor distribution is employed as the excitation amplitude coefficients of each patch, which can allow the antenna array to achieve lower sidelobe level (SLL). A 1 to 8 substrate integrated waveguide (SIW) power divider is proposed to feed the 8×8 radiation patches. The radiation elements and the SIW feed network are on the same layer. The antenna array shows good performance at W-band with the center frequency 94GHz. At 94GHz, S11 of the power divider is less than -20dB and S21~S91 are greater than -10.5dB. The simulation results show that the antenna array has a peak gain of 22dB at 94GHz.

I. Introduction

In recent years, millimeter wave (30-300GHz) has developed rapidly in the fields of automotive radar [1 – 3], medical treatment, advanced drive assist system (ADAS), high-resolution imaging, safety inspection system and high-data-rate communications [4], which has attracted the attention of more and more researchers. As a wireless device for transmitting or receiving electromagnetic waves, antenna is indispensable in communication radar system. With the development of modern radar and communication industry, microwave frequency band is increasingly crowded and high-frequency spectrum resources are developing.