Design Of U-band Filter Based On Dielectric Gap Waveguide Loade

Due to the surge in electromagnetic spectrum resource demand,the research direction of modern wireless communication is biased towards high-frequency millimeter wave bands with larger channel capacity.Since the birth of Gap Waveguide(GW)technology in 2009,because of its superiority in high-frequency electromagnetic transmission,many scholars have carried out in-depth research and application of Gap Waveguide.This paper is based on two conventional waveguide structures of slot gap waveguide and ridge gap waveguide.After fully investigating the research progress of modern planar structure gap waveguide,combined with the printed circuit board(Printed Circuit Board,PCB)process,a variety of designs are designed using dielectric layers instead of air gaps.Load the medium U-band band pass filter.This dissertation first studies the substrate-integrated slot-gap waveguide technology based on the mushroom-shaped electromagnetic bandgap structure.This technology can be made directly with a dielectric board using PCB technology,and the overall slot-gap waveguide is planar and integrated.The key part of the planar structure slot-gap waveguide,the mushroom-shaped electromagnetic band-gap structure,is numerically analyzed using the dispersion mode method and the waveguide transmission method,respectively.Finally,a U-band bandpass filter based on the planar structure substrate integrated slot gap waveguide technology is constructed,and two types of bandpass filter structures are designed according to whether the gap layer is medium or not.The relative bandwidth of the two types of filters is less than 1.5%,the insertion loss in the passband is less than 3d B,and the return loss is more than 10 d B.The overall design of the filter is simple,realizing miniaturization,planarization and integration,which has engineering practical significance.Secondly,in order to reduce the impact of the overall performance drift caused by the instability of the air gap layer in the conventional ridge gap waveguide,this paper considers using a dielectric plate as the gap layer to design a U-band bandpass filter based on the loaded dielectric ridge gap waveguide technology.The overall design refers to the microstrip filter,and the structure is simple and easy to implement.At the same time,in order to improve the overall selectivity and out-of-band suppression of the filter,a three-pole cross-coupling structure is considered to design a U-band cross-coupling band-pass filter with transmission zeros outside the band.The filters developed in this paper are all made using microstrip laminated technology.The structure is simple and light as a whole.The transition structure at both ends of the filter is convenient for use in radio frequency systems with other devices,and has good engineering application value.