Patent ID: 8891412

Claim:
A circuit arrangement for a mobile radio device, the circuit arrangement comprising: a first transmission path for a first communication system with TDD duplex operation, wherein the first transmission path contains a first transmission filter; a second transmission path for a second communication system with FDD duplex operation, wherein the second transmission path contains a first duplexer; and a third transmission path for a third communication system with FDD duplex operation configured to use a transmission frequency band that is adjacent to the transmission frequency band of the second communication system, wherein the third transmission path contains a second duplexer; and a path for a radio system including a receive filter, wherein the first, second and third communication systems are configured to use transmission frequency bands that are identical, overlapping or adjacent, and wherein a transmitted signal from the first communication system can be routed switchably via the first transmission path or, when the radio system is operating simultaneously with the first communication system, via the second or third transmission path.