Dual-channel passband filtering system using acoustic resonators in lattice topology

A front-end arrangement for use in a telecommunication device, comprising:

• an antenna port connected to an antenna system;
• a first port capable of conveying signals between a first transceiver connected to the first port and the antenna system via the antenna port;
• and
• a second port capable of conveying signals between a second transceiver connected to the second port and the antenna system via the antenna port, wherein at least one first passband filter is connected between the first port and the antenna port for filtering the signals conveyed between the first transceiver and the antenna system, and at least one second passband filter is connected between the second port and the antenna port via a phase shifter for filtering the signals conveyed between the second transceiver and the antenna system, 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.