A Broadband Planar Monopulse Antenna Array of C-Band

In this letter, a broadband planar monopulse antenna array of C-band for the application of monopulse radars is presented. A novel wideband monopulse comparator as the sum-difference feed network has been designed, and a multilayer 4 × 4 microstrip antenna array as the radiation part has been fabricated. The measurement results demonstrate that the impedance bandwidth (VSWR ¿ 2) of the proposed monopulse antenna array is up to 28.2% and the null depth can reach -28 dB, which ranges from 5.05 to 6.675 GHz. At the same time, the peak sum beam gain is up to 18.4 dB. Compared to other monopulse antennas, the proposed monopulse antenna array exhibits excellent characteristics.