Design of 77GHz Differentially-Fed Antenna Array using Chebyshev Distribution

This paper presented a differentially-fed antenna array operating at 77 GHz. The series-fed antenna array is excited on the main radiation patch through coupled microstrip lines (MSLs), thus forming a mesh structure. In order to reduce the coupling effect, metallized vias are added between array columns. Then we change the feed form by adding two circulators. The antenna array has a bandwidth of about 3.5 GHz with respect to a return loss of 10dB. The 3 dB beam widths are 18 degrees and 30 degrees in the E-plane and the H-plane, respectively. The simulation result shows the good frequency stability of the gain at a certain bandwidth of the center frequency point.