Ultra-wideband filters with transmission zeros in the passband

Jiafeng Zhou, Kevin Morris*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review


Wideband microwave filters cover a wide band of continuous frequencies. In this paper, the design and implementation of an ultra-wideband filter is firstly introduced. In real applications, there might be interference inside the passband of the filter, and it is usually necessary to suppress the interference to make most use of the available bandwidth. Traditionally this can be done either by cascading a bandstop filter to the wideband filter, or by designing multiband filters. To achieve compactness, it will be shown in this paper that it is possible to add an extra resonator weakly coupled to the filter. Without any other changes to the original filter, a transmission zero can be produced in the passband of the filter, while the performance of the filter at other frequencies is not significantly affected. This zero can be used to suppress any potential in-band interferences.

Original languageEnglish
Pages (from-to)2165-2168
Number of pages4
JournalMicrowave and Optical Technology Letters
Issue number9
Publication statusPublished - Sept 2013


  • bandstop filter
  • broadband, bandpass filter
  • transmission zero
  • ultra wideband


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