Research On Millimeter Wave Harmonic Mixer Technology

With the rapid development of technology,the frequency band resources below W-band(75?110 GHz)have been occupied by various wireless systems.The spectrum allocated to other use systems will be pushed to a higher frequency band.Therefore,the design of millimeter wave and higher frequency band is very important.The research and design of exquisite and high-performance millimeter wave mixer occupies an important position.On the basic theory of millimeter wave mixing technology,aiming at the DMK2308 diode of Skyworks co.and the accurate model of millimeter wave planar Schottky diode,which was established in HFSS(High Frequency Structure Simulator).Then,a variety of millimeter wave mixers are designed based on the established diode model,including 89 GHz second harmonic mixer,W-band 8^th(18^th)harmonic mixer and E-band(60?90 GHz)6^th(16^th)harmonic mixer and other devices.Firstly,this paper introduces the basic theory and design method of millimeter wave harmonic mixing technology,describes the design process of millimeter wave harmonic mixer based on planar Schottky diode design in detail,and fully analyzes how to model the diode,which lays the foundation for the design of 3-millimeter wave harmonic mixers.Secondly,based on the analysis of how to improve the planar diode modelling,a W-band 89 GHz second harmonic mixer is designed based on its three-dimensional model.The structure is exquisite.The simulation and test results show that when the LO is fixed at45 GHz,the frequency conversion loss is better than 14dB at 84?89 GHz,and the lowest frequency conversion loss is 9dB.The test results are consistent with the simulation trend.Finally,on the basis of the subharmonic mixer designed in Chapter 4,we continue to use the field circuit co-simulation method,and design the W-band 8^th(18^th)harmonic mixer and E-band 6^th(16^th)harmonic mixer by adding multiple recovery networks.The simulation results show that the maximum conversion loss of W-band mixer is 32dB,the optimal conversion loss is 14dB,the maximum conversion loss of W-band mixer is 46dB,the optimal conversion loss is 25dB;the maximum conversion loss of E-band 6^th harmonic mixer is 34dB,the optimal conversion loss is 18dB;the maximum conversion loss of E-band 16^th harmonic mixer is 46dB,the optimal conversion loss is 28dB,which is close to the expected index.