Abstract
This paper describes a synthesis method for symmetric dual-passband microwave filters. The proposed method employs frequency transformation techniques for finding the locations of poles and zeros of a desired filter. This method can be used to design dual-passband filters with prescribed passbands and attenuation at stopbands directly without the need for any optimization processes. To validate the procedure a dual-pass-band stripline filter is designed and fabricated. The stripline dual-passband filter is designed with passbands at 3.90-3.95 and 4.05-4.10 GHz, and 30-dB attenuation at the stopband. This measured results show a good agreement with the theoretical ones. The frequency transformation for symmetric dual-passband filters is also extended to include asymmetric dual-passband responses. This flexible frequency transformation preserves the attenuation characteristics of the low-pass filter prototype. Examples are shown to discuss the flexibility of this transformation.
| Original language | English |
|---|---|
| Pages (from-to) | 1163-1170 |
| Number of pages | 8 |
| Journal | IEEE Transactions on Microwave Theory and Techniques |
| Volume | 55 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2007 Jun |
| Externally published | Yes |
Keywords
- Circuit synthesis
- Dual-passband filters
- Microwave filters
ASJC Scopus subject areas
- Radiation
- Condensed Matter Physics
- Electrical and Electronic Engineering