Research And Design Of Multifunctional Microwave Passive Device Based On Vanadium Dioxide

With the rapid development of multi-mode,multi-function and miniaturization in wireless communication systems,the demand for radio frequency front-end microwave devices are becoming higher and higher.Traditional microwave devices have a single function,low device integration,and the number of devices increased significantly.These problems cause the electromagnetic interference between the devices to become more and more serious.In response to the problems encountered today,microwave devices with multi-functions have attracted more and more scientific researchers'attention.Since the reconstruction of the index multifunctional circuit was proposed in the 1960s,the research on multifunctional circuits has been one of the hot spots for decades.At present,most multifunctional devices can achieve is the multifunctional design of indicators under a single microwave device,and there is no further realization of the multifunctional design of multiple microwave devices in the microwave field.At present,the working principle of most microwave passive devices is to control the distribution of electromagnetic fields by controlling the conduction of current in the device in the microwave field.Because the microwave field itself is limited by the complexity of electromagnetic distribution and propagation,it is difficult to realize the multi-functional means of using digital circuits in the microwave field.In this paper,the application of vanadium dioxide was first studied,and the electrical conductivity before and after the phase transition was as high as 10~3 powers in the microwave field.The amplitude value of insertion loss of the two-port network before and after the phase transition was tested up to-12d B or more in the 2GHz-6GHz frequency band;Secondly,the frequency-adjustable band-pass filter was studied with vanadium dioxide,and the performance of the hybrid circuit composed of magnetron-sputtered vanadium dioxide with the microwave device and the copper film of the printing process was verified.The initial model of the 2-in-1 multi-function device concept is proposed and verified by physical processing.Finally,the paper elaborated on a hybrid,multi-functional microwave passive device structure starting from the mathematical mechanism,through local sputtering of vanadium dioxide phase change film to electrically connect or isolate traditional copper plane transmission lines and copper resonator.The controlled combination of the interconnected phases of the vanadium dioxide film effectively guides the direction,flux distribution and velocity of electrons at microwave frequencies,so that the electromagnetic response of the device can be reshaped without rebuilding the physical structure.The device realizes the integrated design of microstrip patch antenna,band-pass filter pair and T-shaped power splitter at the operating frequency of 4.75 GHz.