Research On Integrated Substrate Gap Waveguide Filtering Power Divider And Unequal Power Divider

Intelligent control devices are all around us.Control systems are not only used in traditional industrial equipment,but also widely used in communication equipment.For example,control systems are playing a new role in the control of radar radiation direction and feeder switches.In the era of rapid development of communication,the equipment is changing faster and faster,and the requirements for RF front-end are getting higher and higher.As an important device in the feeding system,power divider can no longer meet the current communication needs with its single function,so the fusion device has become a hotspot of current research.As microstrip lines suffer from high losses in the high frequency band,the Integrated Substrate Gap Waveguide(Integrated Substrate Gap Waveguide,abbreviations ISGW)technology offers low losses and self-encapsulation,especially in the high frequency band.Based on ISGW,this thesis designs a power divider with filter response in the Ku band;The current design of unequal power dividers is a fusion of microstrip lines and other structures to achieve high impedance,which can make the structure complex,In order to get rid of this design idea,a novel unequal power divider is proposed.The main research work is as follows:(1)Filtering power dividers require a combination of insertion loss and filtering characteristics in the high frequency band.A fishbone gap filtering power divider(Filtering Power Divider,abbreviations FPD)based on ISGW is proposed.This structure is designed by etching fishee-shaped slot and cascade power divider.The equivalent circuit of the structure is analyzed and solved,and optimized by simulation software.It is compared and summarized with FPD in other literatures.The final results show that the center frequency of the structure is 15.8GHz,the operating band is 13.5GHz-18.3GHz,the relative bandwidth is 30.38%,and there is a zero on each side of the passband at10.6GHz and 20.3GHz,out band rejection can reach below 21 d B,with good frequency selectivity.The insertion loss is less than 0.8d B,and the isolation is greater than 15 d B.(2)Aiming at the complex structure design of the unequal power divider,a ISGW complementary split-ring resonator(Complementary Split Ring Resonators,abbreviations CSRR)unequal power divider is proposed to get rid of the traditional design idea and use the gap to change the energy distribution to achieve unequal division.The two CSRRs do not adopt a nested structure,but are connected back-to-back to achieve an uneven distribution of energy.The results show that the CSRR unequal power divider has a center frequency of 26.3GHz,the structure works at 24GHz-29.5GHz,and its power ratio is about 4:1 and the isolation is better than 19 d B.According to the circuit analysis of the structure,the split direction of the CSRR has little effect on the power ratio,which is also consistent with the simulation results.This structure can increase or decrease the power ratio by changing the position of the CSRR.