This thesis presents new procedures and guidelines for the design of advanced microwave filters. Practical implementations include dual-band, multi-band and ultra-wideband filters for applications in wireless and telecommunication systems. The traditional narrow-band coupling-matrix approach is extended to include multiple and out-of-band resonances, which allows the model to accurately predict and design the filter performance over a wide frequency range. A variety of coupling scenarios are presented and their advantages over current designs demonstrated. The approach includes the placement of transmission zeros in order to obtain quasi-elliptic responses, improve stopband performance and generate sharp transitions from the passbands to their adjacent stopbands.
In order to contribute to filter miniaturization, bandwidth enhancement and manufacturing simplicity, a new class of step-impedance resonators is proposed and their harmonic tuning properties utilized. Advanced coupling configurations are realized, which are applicable to single- or multi-band filter operations with bandwidths ranging from a few percent to fifty percent. Moreover, the developed design procedures are applied to ultra-wideband filters covering bandwidths of up to 150 percent.
All filters designed with the procedures developed in this thesis are validated by several commercially available electromagnetic field-solver packages, in-house numerical codes and/or measurements. The excellent overall agreement between computational and experimental results verifies the advanced filter design procedures presented in this thesis.
| Identifer | oai:union.ndltd.org:uvic.ca/oai:dspace.library.uvic.ca:1828/2595 |
| Date | 13 April 2010 |
| Creators | Mokhtaari, Marjan |
| Contributors | Bornemann, J., Amari, Smain |
| Source Sets | University of Victoria |
| Language | English, English |
| Detected Language | English |
| Type | Thesis |
| Rights | Available to the World Wide Web |
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