基于微带无源电路的宽带毫米波分谐波混频器

A broadband millimeter-wave sub-harmonic mixer using microstrip passive circuits

设计了一款基于微带结构的宽带毫米波分谐波混频器。混频器中引入了短路结构的宽带射频滤波器以及一个高性能本振-中频双工器,这些无源电路能够抑制空闲组合频率,同时为中频、射频以及本振信号提供合适的回路。测试结果表明,本文设计的毫米波分谐波混频器射频工作频率为27~48 GHz,中频工作频率宽至6 GHz.在整个工作频段内上、下变频损耗均小于12.5 dB。当射频为33 GHz,中频为1 GHz时,上变频、下变频达到最小变频损耗分别为8.2 dB和7.5 dB。

This paper presents a millimeter-wave microstrip-based sub-harmonic mixer with a wide operation band.In this design,frequency suppression circuits including a wideband bandpass short-circuited filter and a diplexer are employed not only to provide proper terminations for the intermediate frequency(IF),radio frequency(RF),and local oscillator(LO)signals simultaneously,but also to reject the major idle mixing products.The measured results show that the proposed sub-harmonic mixer can support the operations in RF band from 27 to 48 GHz,and in IF band up to 6 GHz.Meanwhile,the conversion loss is less than 12.5 dB for both up-and downconversion throughout the bandwidth,in which,the minimum conversion loss is about 7.5 dB and 8.2 dB for the down-conversion and up-conversion,respectively,at an RF of 33 GHz and IF of 1 GHz.