Patent ID: 7800461
Filing Date: 2010-09-21
Classification: H03H

Abstract:
1. An antenna duplexer comprising a high band side filter, a low band side filter, an inductor, and a capacitor, and having a phase shifter connected to both of said filters on the antenna port sides to ensure phase matching of both of said filters, wherein said phase shifter comprises a resonance capacitor resonating with said inductor, or a resonance inductor resonating with said capacitor, and an attenuation characteristic is obtained in an out-of-pass band of both of said filters by the resonance; and wherein said phase shifter has a filter configuration including an inductor in series between the high band side filter and the antenna port and further including capacitors respectively between both terminals of the inductor and the ground, and said resonance inductor connected to the capacitor in series on the antenna port side.