Design of a Cosecant-Squared Pattern Antenna Based on All-metal Filter Antenna

In this paper, a residual cut square antenna array is designed based on a broadband all-metal cavity slot antenna with filtering performance for aerial reconnaissance radar. The proposed antenna element consists of a metal cavity with radiation slots and a metal matching block. The antenna element obtains a wide operating bandwidth through the multiple resonant modes of the cavity and slots. Simulation results show that the impedance bandwidth (S11<-10 dB) of the antenna element is operating from 7.83 GHz to 12.41 GHz with a relative bandwidth of 45%. It also has good filtering characteristics with more than 20-dB stop-band rejection, which suppresses unwanted interference and helps to achieve a good electromagnetic compatibility (EMC) design. A 2×16 antenna array was designed to verify the performance of beam scanning for Cosecant square.