一种W波段低损耗宽带单平衡混频器设计

针对某型半实物仿真系统大带宽、高动态的技术需求，研制了一种覆盖整个W波段的单平衡混频器。混频器基于波导-石英混合电路以及分立肖特基二极管设计，射频信号经减高波导同相激励两个肖特基结，以减少无源电路的额外损耗。本振信号通过波导E面探针输入，以准TEM模反相激励肖特基结。测试结果表明，所设计混频器在13dBm本振功率激励下，可在75～110GHz范围内实现6～8dB的单边带变频损耗，中频带宽为DC～35GHz。该混频器与国内外同类高性能产品技术性能相当，已成功应用于W波段半实物仿真系统中。

Design of a W-band low-loss broadband single-balanced mixer

A single balanced mixer covering full W-band was designed for a hardware in the loop (HIL) simulation system to achieve large bandwidth and dynamic range. The mixer was designed with waveguide-quartz hybrid circuit and a discrete Schottky diode. Two Schottky junctions were excited in-phase with the radio frequency (RF) signal through height-reduced waveguide, so the additional loss of passive circuits can be reduced. With E-plane probe, the local oscillator (LO) signal was coupled with quasi-TEM mode, thus the two Schottky junctions were driven out of phase. The measured single sideband (SSB) loss is 6~8dB over the 75~110GHz range with 13dBm LO power, and the intermediate frequency (IF) bandwidth is DC~35GHz. The mixer has comparable technical performance with similar high-performance products at home and abroad, and has been successfully applied in the W-band HIL simulation systems.