Research On Plane Integrated Power Divider And Spatial Power Combination Based On Reverberation Chamber

With the rapid development of modern wireless communications,RF front-end systems are developing toward the direction of miniaturization,high integration,and low cost.As two important components in the system,filters and power dividers usually appear together in cascade.Therefore,the research on integrated power divider/synthesis networks with filtering performance?filtering power dividers?have become the focus of attention.The rapid development of mobile communication technology has led to the continuous improvement of the electronic equipment,and the electromagnetic environment has become more and more complicated.As a new type of electromagnetic compatibility testing equipment,reverberation chamber has the characteristics of wide testing frequency bandwidth,low cost,high field strength,large test space,and can simulate diffuse field formed in various electrically large-sized chambers.However,the electric field intensity will not be able to meet the testing environment in the future,which are generated by reverberation chamber exciting by single-transmit antenna.This thesis focuses on these two aspects,designed two type of filtering power dividers and using multiple transmit antennas as excitation sources in the reverberation chamber for spatial power combination to achieve high-intensity radiation field.The main work of the thesis is as follows:?1?An ultra-wideband and miniaturized filtering power divider based on a three-line coupling structure has been designed and studied.The three-line structure of the filtering power divider is used as the main transmission body.It has ultra-wideband characteristics through the loaded short-circuit stub and improved SIR.The test results show that the relative bandwidth of the filtering power divider is 95.2%,the frequency selectivity from stopband to passband is52.9 dB/GHz,and the size is only 0.28?g×0.21?g.?2?A miniaturized and wide stopband filtering power divider based on two quarter-mode substrate integrated waveguides has been designed and studied.The filtering power divider has a symmetrical one-by-two structure.By adopting the method of adding two extra perturbing via-holes in the cavity and etching the U-shaped groove in the top metal layer,the resonance frequency of the TE₁₀₁ and TE₂₀₂ modes is simultaneously affected to forming a filtering passband.The characteristics of wide stopband can be achieved by adjusting the position of output port to suppressing the of high-order modes.?3?Using MATLAB and FEKO joint simulation to realize the automatic stirring to reduce manual settings.The internal structure of the reverberation chamber and the key configuration including the reverberation chamber are introduced in detail,and the simulation data can be automatically calculated by the MATLAB program for field uniformity and field strength.?4?Firstly,The best position and polarization mode of single antenna and dual-transmitting antennas in the reverberation chamber are simulated and analyzed.Then the effects of different topologies under three antennas on the field strength and field uniformity are studied through designing comparison simulation experiments.The simulation results show that the spatial power combination technology can improve the field strength inside the reverberation chamber excited by multiple transmitting antennas.However,with the increase of the number of antennas and the superposition of vectors with different field strengths in the working volume,the efficiency of the reverberation chamber will decrease.