2018 Volume 15 Issue 12 Pages 20180381
A W-band low-sidelobe high-gain planar integrated monopulse array antenna is presented in this paper. The antenna comprises two PCB layers, one is 16 × 41 units series-fed patch arrays and the other is a low-loss slot feeding network based on substrate integrated waveguide (SIW) technology. A W-band waveguide magic T is used in this design in order to get sum and difference beams in horizontal azimuth. Such a two-layer integrated array antenna can be fabricated with standard multi-layer PCB process. The maximal measured gain of the proposed antenna is 26.63 dB, while the maximal null-depth is measured to be is −32.1 dB. Quarter-wavelength transformers are used to achieve Taylor’s amplitude distribution in order to suppress sidelobe. The measured sidelobe level in the vertical plane is within the range of −25.7 dB to −26.4 dB. The designed monopulse array antenna has great practical value in W band portable radar.