基于倒扣技术的K波段CPW环形混频器

Low Cost K-band CPW Rat-race Mixer With Flip-Chip

本文给出了一种应用在汽车防撞雷达前端的单平衡环形混频器。混频器设计中采用CPW线作为传输线,以降低传输损耗,并提出了一种新的混合环的分析方法。电路设计中重点考虑了在较低的本振功率的情况下获得较小的变频损耗。当本振在25GHz有9dBm的信号功率输入时,混频器有5. 2dB的变频损耗,本振到射频和本振到中频分别有46. 4dB和37. 7dB的隔离度。该混频器的结构简单,便于批量生产。

A K-band single balanced Schottky-barrier diode （SBD） mixer, suitable for automotive collision-avoidance radar, has been designed and fabricated. We used a coplanar wave guide （CPW） as a transmission line element for a rat-race hybrid because of its low transmission loss. A new analyzed method to rat-race hybrid is introduced and testified by EM simulation, l.~wer LO power as better conversion loss is particularly considered in designing of the mixer. When LO signal with the power of 9dBm at 25GHz is injected, a conversion loss ofS. 2dB is obtained. Also, the LO to RF and LO to IF isolation of 46.4 dB and 37.7dB are obtained, respectively.