F-band Direct-detection Transceiver Assembl

The millimeter-wave direct detection transceiver module is widely used in object imaging,material analysis and other experiments and test systems.It is usually composed of two parts:the transmitter and the direct-detection receiver.In the W-band and below,the direct detection transceiver module can be realized with commercial MMICs,which features high integration and cost-effective.When the operation frequency is higher than W-band,the cost of MMICbased solution is relatively high,so it is important to develop the crucial functional modules with low-cost discrete devices.Based on the commercial MMICs and discrete diode devices,this paper presents a F-band(90-140 GHz)active ×6 frequency multiplier and power detector respectively,and discusses the working principle,design process and test results in detail.Firstly,based on commercial MMICs,discrete Schottky diodes and hybrid integrated circuit technology,an F-band active ×6 frequency multiplier is designed.The cascade topology of active frequency doubling,filtering,amplification,filtering,passive frequency tripling and amplification is adopted.The passive third harmonic generation is designed with two discrete diodes in anti-parallel to achieve broadband performance.According to the optimization results,a experimental prototype was fabricated and tested.The test results show that when the fundamental input frequency is 15-23.5 GHz and the input power is 2-4 d Bm,the output power is basically larger than 17.5 d Bm in the 90-125 GHz output frequency range,and the output power is higher than 16.5 d Bm in the entire 90-140 GHz frequency range,the maximum output power is 21.8 d Bm@118 GHz The DC power consumption of the whole module is 8 V/1.6 A.Secondly,an F-band broadband power detector is designed based on commercial detector diode and quartz substrate circuit.The detector diode is HSCH-9161.According to the empirical parameters,a three-dimensional full-wave electromagnetic simulation model of the detector diode is established to fully consider the parasitic effects caused by the passive structure of the detector diode.The quartz microstrip probe,DC circuit and RF circuit are designed respectively,and the sensitivity is optimized.According to the optimization results,an experimental prototype is fabricated,and assembled,a voltage amplification circuit based on operational amplifier is designed and integrated into the detector module.The size of the whole model is 34 mm × 20 mm × 20 mm.The test results show that when the input power is about-15 d Bm,the typical value of sensitivity is 600 m V/m W in the 90-135 GHz frequency band,and the peak value of detection sensitivity is 1100 m V/m W near 123 GHz,the typical value of tangent sensitivity is-29 dBm.