A general vector network analyzer employs a super-heterodyne scheme to expand a measuring frequency band. The circuit structure is complicated because of implementing mixers, local oscillators, and amplifiers, therefore, the cost is not affordable. In order to simplify the circuit structure and be affordable, we employ a homodyne scheme, that is the six-port method. In this report, we demonstrated the performance of a six-port reflectometer in the V-band based on a waveguide standing wave detector.
To address the communication needs of high-speed trains such as bullet trains, which require high-speed millimeter-wave wireless links, we developed a high-stability radio-over-fiber system to transmit IEEE802.11ad packets using optical single-sideband (SSB) modulation. The system comprises an optical SSB modulator with automatic bias control and a low-distortion millimeter-wave amplifier stage and is capable of generating and transmitting IEEE802.11ad packets with 16-QAM modulation under an error vector magnitude of 5.8% at frequency of 97.57 GHz over a 45.5-km-long single-mode fiber.
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