关键词：FMCW雷达；雷达收发器；电路设计；毫米波；集成电路；balun
摘 要：An uncommon architecture of a direct-coupled transmit/receive FMCW radar transceiver was investigated and implemented. The architecture uses a single dual polarization antenna to transmit and receive circularly polarized waves and implements a form of on-chip circulator by directing energy between common- and differential-modes on a symmetric waveguide structure.