Patent ID: 6535077
Filing Date: 2003-03-18
Classification: H01P

Abstract:
A dielectric filter comprising:a &lgr;/2 resonator having a center and two ends, for generating resonance at a length of substantially Â½-wavelength at a predetermined frequency, said &lgr;/2 resonator having both ends connected to ground by first and second capacitances, respectively; and a pair of &lgr;/4 resonators respectively for generating resonance at a length of substantially Â¼-wavelength at a frequency substantially equal to the predetermined frequency, each &lgr;/4 resonator having one end open-circuited and the other end short-circuited; wherein each of the pair of &lgr;/4 resonators is disposed between a respective one of said two ends and the vicinity of the center of the &lgr;/2 resonator; an unbalanced terminal is coupled by a third capacitance to the &lgr;/2 resonator; and a balanced terminal is provided by a pair of terminals coupled to the pair of &lgr;/4 resonators by fourth and fifth capacitances, respectively.