一种新型C波段微带耦合器的设计

In this paper the principle of work for the directional couplers of microstrip line is analyzed by the odd-even mode method in microwave technology.Based on the theory with simulationsoftware named ie3d,presented the simulation value of coupling, isolation and reflection for a new structure narrowband microstrip coupler at C band,and given the simulation value of routine structure for comparison.results show that the new structure have advantage in isolation in the same coupling.finally,a new type and pint-sized microstrip coupler with weak coupling and high isolation is designed。The coupler has a central frequency of 5.3GHz and 100MHz bandwidth，its'coupling is -15dB with a high isolation -40dB. the return loss in the passband is less than -20dB and the square of microstrip is only 20mm×15mm. Experiments demonstrate the design feasibility and correctness.