In this paper, a general design method for multiband filters is proposed. First, the frequency and element transformations from a low-pass prototype filter to a practical multiband bandpass filter is derived. Afterwards, formulas for extracting the coupling coefficient k between coupled multimode resonators and the external quality factor Qe are also obtained. Thereafter, the design procedure of coupled multiresonator multiband filters is similar to that of single-band filters. A tri-band microstrip filter with tri-mode resonators is successfully designed with the proposed method and fabricated, which validates this theory.
|Number of pages||9|
|Journal||IEEE Transactions on Microwave Theory and Techniques|
|Early online date||29 Mar 2018|
|Publication status||E-pub ahead of print - 29 Mar 2018|
- Chebyshev filters
- coupling matrix for filter synthesis
- frequency transformation
- Microwave theory and techniques
- multibandpass filters
- multimode resonators.
- Resonant frequency
ASJC Scopus subject areas
- Condensed Matter Physics
- Electrical and Electronic Engineering