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Abstract
This letter presents a method for the design of wide-band pseudo-elliptic waveguide filters without resorting to global full-wave optimization. In this approach, we introduce and employ two novel cavity-backed inverters, which produce transmission zeros in the out-of-band response, however, whose frequency response in the passband is similar to that of normal iris inverters. As a design example, a pseudo-elliptic waveguide filter with transmission zeros in the lower and upper frequency bands are designed and fabricated. The results show good equal-ripple performance in the passband and improved rejection performance with preset transmission zeros beyond the passband.
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