Design of Ka-band antipodal finline mixer and detector

• Published in: Journal of semiconductors Vol. 30; no. 5; pp. 99 - 102
• Main Author: 姚常飞 徐金平 陈墨
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.05.2009
• Subjects: Ka波段; 带阻滤波器; 探测器; 混合器; 电压灵敏度; 设计; 运行频率; 鳍
• ISSN: 1674-4926
• DOI: 10.1088/1674-4926/30/5/055009

This paper mainly discusses the analysis and design of a finline single-ended mixer and detector. In the circuit, for the purpose of eliminating high-order resonant modes and improving transition loss, metallic via holes are implemented along the mounting edge of the substrate embedded in the split-block of the WG-finline-microstrip transition. Meanwhile, a Ka band slow-wave and bandstop filter, which represents a reactive termination, is designed for the utilization of idle frequencies and operation frequencies energy. Full-wave analysis is carded out to optimize the input matching network of the mixer and the detector circuit using lumped elements to model the nonlinear diode. The exported S-matrix of the optimized circuit is used for conversion loss and voltage sensitivity analysis. The lowest measured conversion loss is 3.52 dB at 32.2 GHz; the conversion loss is flat and less than 5.68 dB in the frequency band of 29-34 GHz. The highest measured zero-bias voltage sensitivity is 1450 mV/mW at 38.6 GHz, and the sensitivity is better than 1000 mV/mW in the frequency band of 38-40 GHz.