Research Of Millimeter Wave Waveguide Slot Array Antenna With Wide Band

In the design of the waveguide slot antenna, how to enlarge the workingband-width is the major problem. Meanwhile, the separate aperture isolation betweenthe receiving and transmitting antenna arrays is the key indicator in the design ofsynthesis aperture radar system. In this thesis, we present our researches on the milli-meter-wave broad band waveguide-fed network module, the broadband waveguideslot array radiation module, and the high isolation choke module. Based on these re-searches, an ultra-wide-band (the fractional band-width is6.6%) and high isolation(lower than-60dB) is carried out. The main works in this thesis are listed as follows:(1) In order to obtain the wide-band working of the antenna-fed module, a hybridparallel-fed scheme which consists of H-T waveguide power-divider-fed network and90°bridge is proposed. Through the optimization of the hybrid parallel-fed network,the waveguide-fed module matches well in a wideband the VSWR is lower than1.8in the fractional band-width of6.6%. The radiation pattern of the waveguide slot arrayalso shows a wideband property based on the design of the slot unit. The gain ine-quality is lower than0.25dB in the fractional band-width of8.67%.(2) In order to enlarge the separate aperture isolation between the receiving andtransmitting antenna arrays, the influence of the relative position of the two arrays andthe choke structure have been discussed in this thesis. Via the analysis and optimiza-tion, a metal wall structure is employed to reduce the isolation to-60dB or below.