Bandpass filters have been obtained by side coupling two or three open resonators having step rimmed mirrors. The degree of coupling can be controlled by varying the rim sizes. Experimental tests of X-band models of such filters show their feasibility and the ease of adjustment for the required passband response.
Wen WangJeffrey S. FuYilong LuYong Zhong Xiong
Yunlong LuGaole DaiEr‐Ping LiKai Li