FINITE-DIFFERENCE TIME-DOMAIN MODELING OF A CORRUGATED HORN ANTENNA AS A RADAR SYSTEM FEED

摘要

The design of a reflector-antenna feed for monopulse tracking-radar application is presented. The feed consists of a rectangular-circular mode coupler to isolate the sum and difference channels required for monopulse tracking, and a corrugated horn for a symmetric radiation pattern with low cross polarization. The modeling is carried out using the finite-difference time-domain (FDTD) method, which is well suited for field visualization. The measurements show that the feed performance meets the design requirements and is in close agreement with the FDTD prediction.