Patent ID: 7194247
Filing Date: 2007-03-20
Classification: H03H

Abstract:
1. A dual-channel passband filtering device comprising: a first port; a second port; and a third port, wherein at least one first passband filter is connected between the first port and the second port, and at least one second passband filter is connected between the second port and the third port via a phase shifter, and wherein each of the first and second passband filters comprises: a first filter end having a first terminal and a second terminal; a second filter end having a third terminal and a fourth terminal; at least two series elements including a first and a second series element; and at least two shunt elements including a first and a second shunt element, wherein the first series element having a first end connected to the first terminal and a second end connected to the third terminal; the second series element having a first end connected to the second terminal and a second end connected to the fourth terminal; the first shunt element having a first end connected to the first terminal and a second end connected to the fourth terminal; and the second shunt element having a first end connected to the second terminal and a second end connected to the third terminal, and wherein each of the series and shunt elements includes an acoustic resonator.