Research On Millimeter Wave Power Divider Based On ISGW And Its Application In Array Antenna

With the demand for high speed and high accuracy of wireless communication,higher requirements are placed on the feed network and the transmitter/receiver.Integrated substrate gap waveguide(ISGW)is a waveguide that constructs an electromagnetic bandgap structure to limit the propagation path of electromagnetic waves.Because of the low loss and good encapsulation of this waveguide,the research in this paper is based on the structural study of this waveguide.The extended application mainly involves power splitters and array antennas to meet the needs of 5G millimeter wave communication.Therefore,the research in this paper is of great significance.The main research work of this paper is as follows:(1)Two millimeter-wave Wilkinson splitters based on ISGW are proposed.The first is a millimeter-wave two-power splitter based on ISGW.The power splitter adopts the ISGW structure technology,and the structure is composed of three dielectric plates.The upper surface of the upper dielectric plate prints a metal layer to form an ideal electrical conductor(PEC),and the lower surface prints a power divider microstrip line;the intermediate layer medium The board separates the upper and lower dielectric plates,and at the same time enables the microstrip line of the power divider to be flexibly laid out;the mushroom-shaped electromagnetic band gap(EBG)periodic structure is printed on the bottom dielectric plate to form an ideal magnetic conductor(PMC),and the three layers are combined.The ISGW structure implements encapsulation of the upper layer microstrip power divider.The ISGW structure model is constructed to study the electromagnetic bandgap characteristics of EBG.The equivalent circuit method is used to add resistance to the upper surface of the upper dielectric plate to solve the isolation problem that is difficult to solve in the package.Simulation and experimental test The results show that the-20dB operating frequency band is 25.2GHz-29.3GHz,and the insertion loss is only about 0.4ldB.The second is based on the ISGW's millimeter-wave quad-power splitter,which uses a similar design approach to the two-power splitter,but the transmission line is designed according to a one-four-four Wilkinson splitter.The simulation results show that the-15dB operating frequency band is 23.6GHz-28.9GHz,the insertion loss is 0.46dB,and the isolation is lower than-20dB.(2)A dual-band electromagnetic dipole antenna w:ith complementary patterns is proposed.This type of antenna has a low profile and is easy to integrate.It can be directly connected to the feed with a microstrip line to achieve good planarity in circuit design.Moreover,the antenna is loaded on the integrated substrate gap waveguide and designed as an electromagnetic dipole antenna with dual-band characteristics.The simulation results show that the operating band is 18.3GHz-21.3GHz and 22.1GHz-29.6GHz,and the gain can be achieved.9dBi,relative bandwidth is 15.4%and 29%.And the E and H plane patterns are basically the same.(3)A low profile ISGW electromagnetic dipole 2x2 array antenna is proposed.The array antenna utilizes the aforementioned ISGW-based millimeter wave quad-power splitter as a feed structure,and the improved electromagnetic dipole antenna is an array unit.According to the theoretical calculation,the spacing between the antenna elements is calculated,and then the research is carried out from the binary matrix,and the in-phase array element arrangement can be used to make the beam more concentrated.The conclusions are further applied to the four-element array and then to the four-element.The parameters of the different arrays of the antenna are optimized and compared.The simulation and test results show that the bandwidth of the array antenna is 22.7GHz-30GHz,the half power angle is 280(-140 to 140),and the maximum gain can reach 15.6dBi.