Stripline filter
AssigneeMurata Manufacturing Co., Ltd.
InventorsHitotsugu Mori, Motoharu Hiroshima
Life of this patent
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Abstract
A stripline filter with wide-band filter characteristics having an attenuation pole on a high frequency side of frequency characteristics. The stripline filter includes at least three resonant lines, and two of the resonant lines include parallel line parts and bent parts. The third resonant line has a U shape in which both ends thereof are open and interdigitally coupled to the two resonant lines located on both sides thereof. The parallel line parts extend from base ends connected to a ground electrode via side surface lines that are parallel to respective line parts of the third resonant line. The bent parts extend so as to be bent from ends of the parallel line parts, and face each other at an interval.
Claims7
A stripline filter comprising:
- a dielectric substrate having a top surface, a bottom surface opposite the top surface, and side surfaces connecting the top and bottom surfaces;
- a ground electrode on the bottom surface of the dielectric substrate;
- a plurality of resonant lines on the top surface of the dielectric substrate;
- side surface lines on at least one of the side surfaces of the dielectric substrate and connected to at least the ground electrode;
- and
- an input/output electrode coupled to any resonator formed between the ground electrode and each resonant line of the plurality of resonant lines, wherein
- the plurality of resonant lines include a first resonant line having a U shape in which ends thereof are open and which is interdigitally coupled to second and third resonant lines located on opposed sides thereof,
- each of the second and third resonant lines has (1) a parallel line part that extends from a base end connected to a side surface line, in parallel to the first resonant line;
- and (2) a bent part that extends so as to be bent from an end of the parallel line part, and
- the bent part of the second resonant line and the bent part of the third resonant line face each other at an interval.
Dependencies are inferred from the claim text.