Two Improved Structures For Quasi-Optical Monopulse Antenna

In this paper, two different improved structures for quasi-optical monopulse antenna are proposed. They are composed of thin lens, quasi-optical sum-difference comparator and dielectric prisms. The antennas are designed by quasi-optical (Q O) technology and simulated by finite-difference time-domain (FDTD). The structures and parameters are optimized to reduce sidelobe level of radiation pattern and improve the performance of antenna. The simulation result demonstrates good antenna performance, the sidelobe levels of improved structure I is below -14.0 dB and the null-depth is -26 dB and the other structure,s sidelobe levels is below -15.0 dB and the null-depth is -27.5 dB at the center frequency f
₀
GHz.