Design of a down-Conversion Mixer for Four Sub-Harmonic in W-Band

Abstract

This paper presents principles of a down-converted mixer for four sub-harmonic designed by ADS software. The LO and RF frequencies are 23GHz, 92-94GHz respectively. The structure of ridge waveguide to microstrip transitions is optimized by CST simulation software, and W-band signals are directed to mixer RF side. The simulation results show that this mixer achieves higher 1 dB compression point, loss of frequency conversion less than 15 dB and good linearity.

An Matter-Element Theory Based Study on Construction Green Degree Evaluation of High-Speed Railway Project

“…Several studies on construction green degree evaluation were performed by previous scholars.Jinyan Liu(2011)analyzed construction green degree evaluation problem of construction project by using analytic hierarchy process(AHP) [2].Bo Wang(2011)provided evaluation standards of green and civilization construction in Singapore [3].Jianwei Zhang etc. (2011) took plan design of green construction as research object among project management practice,established and perfected rules and regulations and promoted the implementation of green construction [4].Yongqiang Liu etc. (2011)introduced construction green degree evaluation from the point of cost analysis [5].Weixing Shao(2012)used the value engineering principle,AHP and fuzzy mathematics method to evaluate waste source reduction coefficient of construction stage and green degree [6].Xisheng Zhu et al(2012) had in-depth analysis of the green construction in construction enterprises,one of difficult reason to implement was lack of effective evaluation system [7].According to the ideas of the full life cycle assessment method,Cheng Yi etc.…”