| The sum-difference network and the transmit/receive antenna are monopulse radar's keytechnologies. Taking the microwave/millimeter waves accuracy tracing as the applicationbackground, the planar structure MW/MMW (14GHz/35GHz) monopulse radars havebeen studied, designed and tested in this dissertation. The work details include:1. Using odd-even mode theory, the principle of the MW/MMW microstrip branchcoupler has been analyzed. A microstrip directional coupler has been designed by ADS.Two cross shaped sum-difference networks have been built, whose center frequenciesare 14GHz and 35GHz. The cross shaped sum-difference network has some advantages,such as compact structure, less weight, small volume and so on.2. Microstrip branch coupler has narrow relative bandwidth, so a offset double-sidemicrostrip coupler has been designed by HFSS. The simulation results indicate that thiskind of coupler has similar volume and weight compared with ordinary microstripbranch coupler, but its relative bandwidth is more than 30%.3. An 8×16 rectangular microstrip antenna array has been designed and manufactured,whose center frequency is 13.7GHz. Its measured results agree with simulation results.It offers whole parameters to transmit/receive antenna of monopulse radar.4. Based on simulation results, we designed two microwave/MMW monopulse antennas,whose center frequencies are 14GHz and 35GHz, respectively. Measured results andsimulation results supply reference for the investigation on the forward subsystem ofthe microwave/MMW monopulse radar. |
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