Abstract
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.
Original language | English |
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Pages (from-to) | 1-9 |
Number of pages | 9 |
Journal | IEEE Transactions on Microwave Theory and Techniques |
Early online date | 29 Mar 2018 |
DOIs | |
Publication status | E-pub ahead of print - 29 Mar 2018 |
Keywords
- Chebyshev filters
- coupling matrix for filter synthesis
- Couplings
- frequency transformation
- Microwave theory and techniques
- multibandpass filters
- multimode resonators.
- Prototypes
- Resonant frequency
- Resonators
- Topology
ASJC Scopus subject areas
- Radiation
- Condensed Matter Physics
- Electrical and Electronic Engineering