Study On Ridge Edge Slot Array Antenna Of Rectangular Symmetric Single Ridge Waveguide

In modern society,wireless electronic communication equipment has penetrated into all aspects of human social life with the development of science and technology,which makes the electromagnetic space environment more complex and affects the security of communication.It is necessary to enhance the anti-interference ability to ensure the security of communication.Good transmission characteristics make rectangular waveguide be made into slot antenna to transmit electromagnetic wave,but the rectangular waveguide slot array antenna has low anti-interference ability.Therefore,the improvement of anti-interference ability will have very important research value.By analyzing current distribution on the ridge and the cross polarization principle of the ridge symmetric slot in the rectangular symmetric single ridge waveguide,it is found that the low cross polarization level can be achieved by setting a symmetric slot at the ridge.The effects of slot width and geometric parameters of rectangular symmetric single ridge waveguide on the resonant characteristics of the ridge edge slot of symmetric single ridge waveguide are studied,on the basis,the optimal geometric parameters of radiation waveguide are determined.By establishing a 16 element rectangular symmetric single ridge waveguide ridge edge slot linear array antenna model,the cross polarization characteristic is analyzed.The normalized excitation value of each slot is obtained according to Taylor's synthetic pattern theory,and the normalized conductance value of each slot is obtained from the relationship between excitation and conductance.Based on the theory of equivalent transmission line,the relationship curve between slot angle and conductivity is obtained by the model of extracting slot parameters.The simulation result shows that the ridge edge slot linear array antenna of rectangular symmetric single ridge waveguide can achieve low cross polarization level and has good anti-interference performance.The linear slot array antenna is difficult to meet the performance requirements of lower cross polarization level,while the planar array slot antenna has lower cross polarization level performance.So the cross polarization characteristic is analyzed through a 1 × 4 rectangular symmetric single ridge waveguide ridge edge slot array antenna model.The influence of the structure parameters on the reflection coefficient of the four-way rectangular symmetrical single ridge waveguide power divider is studied,on the basis,the structure parameters of the power divider are obtained.The influence of waveguide spacing and connection plate position on antenna performance is analyzed by establishing 1 × 2 rectangular symmetrical single ridge waveguide ridge slot planar array antenna model,so the optimal parameters of waveguide spacing and joint plate position are determined.The simulation result shows that the designed 1 × 4 rectangular symmetrical single ridge waveguide ridge slot planar array antenna can achieve ultra-low cross polarization level,so it can improve the anti-interference of radar system.