A novel type of dual-mode microstrip bandpass filter using degenerate modes of a meander loop resonator has been developed for miniaturization of high selectivity narrow-band microwave bandpass filters. A filter of this type having a 2.5% bandwidth at 1.58 GHz was designed and fabricated. The measured filter performance is presented.
Hong, J-S., & Lancaster, M. J. (1995). Microstrip bandpass filter using degenerate modes of a novel meander loop resonator. IEEE Microwave and Guided Wave Letters, 5(11), 371-372. https://doi.org/10.1109/75.473539