Patent ID: 6768399
Filing Date: 2004-07-27
Classification: H01P,H03H

Abstract:
A laminated bandpass filter comprising:an input electrode, output electrode and grounding electrode placed on an end face of a laminated body integrating a plurality of laminated dielectric sheets; an internal grounding electrode provided in an internal layer of said laminated body and connected to said grounding electrode; a plurality of capacitor electrodes including at least first and second capacitor electrodes; and a plurality of strip lines including at least first and second strip lines, wherein said first and second capacitor electrodes are capacitatively coupled with said internal grounding electrode and electrically connected to ends of said first and second strip lines, respectively, the other ends of said first and second strip lines are electrically connected to the grounding electrode, and said first and second strip lines are each shaped in a straight line, (i) are placed on the same dielectric sheet, (ii) have the same length and width, (iii) are placed symmetrically with respect to a center line between said first and second strip lines, and (iv) said first and second strip lines are placed in parallel with each other through their entire lengths and separated by a certain distance, and thereby are electromagnetically coupled to each other within the same layer.