Research On Amplitude And Phase Measurement Technology Of W-band Space Field

Millimeter wave has obvious advantages such as large communication capacity,high imaging resolution and high guidance accuracy.With the promotion and application of 5G millimeter wave,the research of millimeter wave technology is getting deeper and deeper,and the frequency involved is also getting higher and higher.It has rapidly developed to the W band.Due to factors such as insertion loss,the W-band microwave devices mostly use waveguide structures.Especially in high-power transmission and transmission applications,in order to ensure that the system has a sufficiently high power capacity,the waveguide structure usually needs to be over-mode design,and the ensuing It is the test of the device.The measurement of the amplitude and phase of the space radiation field is an important method to detect the performance of millimeter wave devices.The main task of this paper is to carry out research on the W-band space field amplitude and phase test technology,and propose a combination of spread spectrum module and phase discrimination chip to design a miniaturized,low-cost,and simple-touse W-band amplitude and phase test system.The main contents of this article are as follows:1.This article first briefly introduces the characteristics of millimeter wave,and summarizes the domestic and international status and development trends of amplitude and phase testing technology.Then the amplitude test subsystem is designed based on the superheterodyne receiver structure,and the phase test subsystem is designed using microwave phase detector,and then the two are combined to form a W-band space field amplitude and phase test system.A verification experiment was carried out on the phase test subsystem,and the existing problems were found and analyzed,focusing on solving the phase coherence of multiple branches,and further improving and perfecting the system.2.The specific design of each module of the test system is developed.A broadband frequency synthesis source based on a phase-locked loop.The test results show that the frequency source has excellent phase noise and spur suppression,and fully meets the system requirements.Using HFSS software to design and optimize the WR10 waveguide microstrip transition structure based on the fin line,the return loss is better than 20 dB and the insertion loss is less than 0.3dB in the full waveguide bandwidth.Based on the basic theory and design method of low-noise amplifiers,mixers and frequency multipliers,Wband amplifiers,fundamental mixers and frequency multipliers were designed;in order to improve the sensitivity of frequency conversion receivers,narrow-band microwave amplitudes and Phase detection circuit.The shorter guided wavelength of the W-band is likely to cause resonance in the device cavity,and the problem of cavity resonance is also addressed in this paper.During the overall cascading and debugging of the system,the sensitivity and dynamic range problems encountered were analyzed,and improvement measures were proposed.3.The W-band duplexer was tested using the developed amplitude and phase test system.The actual test results are in good agreement with the theoretical calculation results,indicating that the system has good practicability and reliability.The test system developed in this paper can meet the actual test requirements of W-band devices.