W-band Frequency Modulated Continuous Wave Radar Transceiver Front-end

W-band is an atmospheric window for millimeter-wave band, research on transceiver front-end in this band is always a hot topic in millimeter-wave applications. Transceiver front-end is the key component of microwave and millimeter-wave radar circuit and system, and has a decisive influence on system performance. This thesis mainly focus on a W-band radar transceiver front-end design and implementation.In this thesis, relevant core theories of millimeter-wave radar transceiver front-end were analyzed, and the basic structure and working principle of Frequency Modulated Continuous Wave radar was studied, and then the design of a multi-cavity single-emission-double-reception FMCW radar transceiver front-end was proposed. The work of this thesis mainly reflected in following aspects:First of all, two forms of microstrip line-waveguide probe transition for both W-band and Ka-band were analyzed and designed, and were implemented to the circuit;Secondly, based on the theories of microstrip lines and waveguide band-pass filters, designed a parallel coupled microstrip lines filter, and a new combined structure of an E-plane waveguide metal diaphragm filter and a Tee-type splitter was proposed, which saved space without reduction in performance. This structure was implemented between the tripler and the doublers, in order to suppress the fundamental and other harmonics of the tripler;Then, selected MMIC chips which meet the system requirements for active components in the circuits of the system, and improved the performance.Again, designed and drew the specific structure of each cavity and circuit board in the transceiver front-end circuit, and satisfied the technical indicators requirement in overall dimensions and interface position.Finally, assembly, debugging and test of the transceiver front-end were done.After assembly, debugging and test, reached the following main technical indicators:Transmitter: transmission power is 20.17 dBm to 20.25 dBm, ripple in band is less than 3%;Receiver: the amplitude inconsistency between IQ channels is less than 1dB, the phase inconsistency is less than 8°.