A Compact Waveguide Quasi-Elliptic Dual-Band Filter

This paper presents a novel configuration of dual-band filter employing TE11m dual-mode elliptical cavity resonators. The proposed side-coupled configuration leads to a significant reduction of filter footprint compared to previously reported dual-band filter structures. Such configuration also facilitates cross-couplings to realize advanced quasi-elliptic filter functions. To demonstrate the concept, an 8-pole C-band elliptical cavity dual-band filter is designed, manufactured and measured.