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Bandpass filters with tunable transmission zeros and harmonics suppressions are designed using coupled linear tapered-line resonators (LTLR). Tapped lines are used as input and output ports to create and tune two transmission zeros independently, and quarter-wavelength impedance transformers are utilized to ensure the desired quality factors. Measurement results of bandpass filters at 2.4GHz with optimized stopbands are also given to validate the theory.
Microwave Conference Proceedings, 2005. APMC 2005. Asia-Pacific Conference Proceedings (Volume:1 )
Date of Conference: 4-7 Dec. 2005