Research And Fabrication Of Several Wideband Passive Devices

In recent years, with the development on the applications of wireless tele -communication and radar, the demand on RF wideband devices increases a lot. With the maturity of microstrip theory, no matter in microwave instrument or wideband digital wireless communications, microstrip has been the first choice of RF circuit design for its simpleness and low cost.Especially after 90s of last century, there come a lot of great commercial EM computing engines software for the development on the theory of computational electromagnetic. The design of microstrip no longer depends on those so-called experiences , optimization throgh EM simulation has been the important step we cannot skip.In this paper, I'll give three new kinds of wideband microwave devices: wideband high directivity coupler, wideband 90 degree well matched phase shifter and wideband dual polarization microstrip antenna. Besides the actual designs, this paper will also try to find quick and appropriate ways to get these designs.