Tamagawa Electronics’ (TME) 45 GHz frequency division duplexing transceiver was developed as a mmWave radio communications system and a platform for design spins to meet custom applications.
The transceiver is a single conversion design for both transmit and receive. A 2 GHz input signal drives a harmonic mixer, where it is up-converted to 45 GHz. The signal is then filtered and amplified before feeding an isolator and duplexer. The receive signal passes through the duplexer and separate isolator before being amplified and down-converted to 2 GHz with an image rejection mixer. The transceiver includes a 10 GHz phase-locked oscillator which provides the local oscillator (LO) for the up- and down-conversion mixers. The 10 GHz LO directly drives the harmonic mixer in the transmit path and a x4 multiplier feeding the image rejection mixer in the receive path. An external 10 MHz reference is required for the phase-locked oscillator.
The transceiver’s output power is typically 27.5 dBm at 1 dB compression and is guaranteed to be at least 23 dBm. Typical gain is 47 dB, and spurs below −65 dBc. The receiver has 25 dB typical gain with 12 dB noise figure and spurs below −60 dBc. The 2 GHz ports use SMA connectors, and the 45 GHz port connects to the antenna with WR19 waveguide. The transceiver is compact, with all circuitry on a single printed circuit board, which makes the unit half the size of a radio built with discrete coaxial modules.
For more than 50 years, TME has been providing high-quality, high performance, cost effective components and subsystems for wireless communications and broadcasting. TME’s products comprise attenuators, terminators, filters, switches, power divider/combiners, directional/hybrid couplers, amplifiers, oscillators and frequency synthesizers.