Patent ID: 6885259
Filing Date: 2005-04-26
Classification: H01P

Abstract:
1. A laminated duplexer made of a plurality of conductor patterns respectively formed on a plurality of dielectric layers, and connected to an antenna terminal while being connected between transmitting and receiving terminals, comprising: a transmitting filter electrically connected to the transmitting terminal while including a plurality of resonating strip lines for passing signals of a transmitting frequency therethrough; a receiving filter electrically connected to the receiving terminal while including a plurality of resonating strip lines for passing signals of a receiving frequency therethrough; and a matching circuit for matching the transmitting and receiving filters with the antenna terminal, the matching circuit including a transmitting matching unit constituted by a first one of the conductor patterns, the first conductor pattern being electrically connected to an antenna electrode coupled to the antenna terminal while being electrically connected to the transmitting filter, a first ground electrode vertically spaced apart from the first conductor pattern by a certain distance, a receiving matching unit constituted by a second one of the conductor patterns, the second conductor pattern being electrically connected to the antenna electrode and the receiving filter, and a second ground electrode vertically spaced apart from the second conductor pattern.