Patent ID: 6130591
Filing Date: 2000-10-10
Classification: H01P,Y10S

Abstract:
A band-pass filter comprising:a dielectric substrate;input and output terminals; anda plurality of conductive strip line resonators being capable of resonating with a predetermined wavelength, each resonator respectively having two ends and bent line extending from one end thereof to the other end thereof with a predetermined length corresponding to said wavelength, said one end and the other end respectively being placed face to face with each other to provide a corresponding gap therebetween,said plurality of resonators having:a first resonator coupled with said input terminal, being capable of resonating with said predetermined wavelength;a second resonator arranged apart from said first resonator at a predetermined interval and coupled with said first resonator through an inductive and capacitive coupling therebetween, being capable of resonating with said predetermined wavelength, and further coupled with said output terminal to output the resonating signal; andat least a third resonator intervening between said first and second resonators,said plurality of resonators being arranged on said dielectric substrate in series and spaced apart from each other at predetermined intervals therebetween along substantially a predetermined circular position line encircled around a center of said substrate with a predetermined radius and extending from said first resonator to said second resonator,said at least a third resonator being coupled with said first and second resonators through the inductive and capacitive coupling to transfer a signal from said first resonator to said second resonator therethrough,adjoining ones of said plurality of resonators having a predetermined intensity of coupling therebetween in accordance with a respective gap position relationship between the positions of said respective gaps of said adjoining ones of said resonators,said plurality of resonators being arranged on said substrate so that substantially all of the signal transferred from said first resonator to said second resonator passes in series from said first resonator through said at least a third resonator to said second resonator.