Patent ID: 7262675
Filing Date: 2007-08-28
Classification: H01P

Abstract:
1. A laminated filter with improved stop band attenuation comprising: a laminated structure including a plurality of dielectric layers and input and output electrodes formed at external sides of the plurality of dielectric layers; a plurality of resonator patterns each of which is separately formed at a first one of the plurality of dielectric layers with a predetermined interval; a first mutual capacitor pattern formed at a second dielectric layer of the plurality of dielectric layers adjacent to the first dielectric layer, the first mutual capacitor pattern facing a part of one or more resonator patterns of the plurality of resonator patterns to form capacitive coupling; a first feeding line formed at the second dielectric layer, the first feeding line having an end connected to the first mutual capacitor pattern and another end connected to the input electrode or the output electrode; a second mutual capacitor pattern formed at a third dielectric layer adjacent of the plurality of dielectric layers to one side of the first dielectric layer, the second mutual capacitor pattern facing a part of one or more resonator patterns of the plurality of resonator patterns to form capacitor coupling; a second feeding line formed at the third dielectric layer, the second feeding line having an end connected to the second mutual capacitor pattern and another end connected to the input electrode or the output electrode; and a coupling capacitor pattern formed on the third dielectric layer and spaced from the second capacitor pattern and the second feeding line, the coupling capacitor pattern facing each of two or more resonators of the plurality of resonator patterns to form cross capacitive coupling, wherein the first feeding line includes: a first pattern connected to the input electrode or the output electrode; and a second pattern connected between the first mutual capacitor pattern and the first pattern, the second pattern forming cross capacitive coupling as the second pattern is coupled to two or more resonator patterns of the plurality of resonators, wherein the second feeding line includes: a first pattern connected to the input electrode or the output electrode; and a second pattern connected between the second mutual capacitor pattern and the first pattern of the second feeding line, the second pattern forming cross capacitive coupling as the second pattern is coupled to two or more resonator patterns of the plurality of resonators.