研究目的
To present a novel folded configuration of dual-band filter employing TE11m dual-mode elliptical cavity resonators for significant reduction of filter footprint and to facilitate cross couplings to realize advanced quasi-elliptic filter functions.
研究成果
The novel folded configuration of dual-band bandpass filters based on dual-mode elliptical cavity resonators offers a reduced footprint and generates a pair of transmission zeros for each of the passbands. The design concept has been validated by two 8-pole C-band prototypes, demonstrating compact size and improved out-of-band spurious response.
研究不足
The use of metallic probes increases assembly complexity and tuning difficulty, and raises high-power-related concerns. The realizable filter bandwidth is limited by the side-coupling configuration.
1：Experimental Design and Method Selection:
The study employs TE11m dual-mode elliptical cavity resonators in a novel folded configuration for dual-band filters. The design includes irises for both sequential and cross couplings.
2：Sample Selection and Data Sources:
Two 8-pole C-band elliptical cavity dual-band filters are designed, manufactured, and measured to validate the concept.
3：List of Experimental Equipment and Materials:
The filters are designed using HFSS, and the assembly is manufactured with aluminum material.
4：Experimental Procedures and Operational Workflow:
The design process involves eigenmode simulation, coupling coefficient calculation, and implementation of new coupling structures for improved responses.
5：Data Analysis Methods:
The performance is evaluated based on insertion loss, rejection levels, and spurious-free window.
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