A Design of W-band CW Transceiver Module

A design of W-band continuous wave (CW) transceiver module is presented in this letter. It is composed of a transmitter submodule and a receiver submodule. In the transmitter submodule, the circuits are mainly composed of filters, amplifiers, a mixer, a frequency multiplier and an amplitude equalizer. The cavity bandpass filter (BPF) by loading inductive iris in H-plane of the waveguide is used to improve the isolation between local oscillator (LO) and radio frequency (RF) ports. The receiver submodule circuits consist of a low noise amplifier (LNA), filters, amplifiers, a mixer, a frequency multiplier and an amplitude equalizer. To get a low noise figure (NF), the waveguide to microstrip probe transition is adopted in the circuits because of its low insertion loss. The LNA monolithic microwave integrated circuits (MMIC) with low NF and high gain is selected to achieve the same goal. To obtain good gain flatness, the amplitude equalizer is adopted in the last stage of intermediate frequency (IF) circuits. The LO signal with the frequency of 11.25 GHz is filtered, frequency multiplied by eight, and then transmits to the LO input port of the W-band converter in both transmitter and receiver submodule. A prototype of the transceiver module has been designed and fabricated. The transmitter submodule has a saturated output power of 15.6±0.7dBm and an isolation between LO and RF ports greater than 40dB. The receiver submodule has a NF better than 4.6dB and a gain greater than 16.8dB.