Abstract: A wireless signal switching circuit for switching a plurality of wireless transmitter signals or a plurality of wireless receiver signals with low loss in a dual mode compatible mobile phone (cellular phone) or other mobile wireless communication apparatus having for example a triple band GSM system as a first communication system and for example a UMTS system as a second communication system is provided. A wireless signal switching circuit 1 has a signal route switch 20 of a F2 or F3 transmission and reception system, a signal route switching circuit 30 of an F1 or UMTS transmission and reception system having a diplexer 31, and a 90 degree phase rotation circuit 40. The relationship of frequencies is F1?F2<F3. The 90 degree phase rotation circuit 40 has the characteristic that the phase of a signal of F2 or F3is rotated by 90 degrees when a switch element 44 is set to a closed state, and a high frequency of UMTS is attenuated when the switch element 44 is set to an opening state.

Abstract: A wireless signal switching circuit for switching a plurality of wireless transmitter signals or a plurality of wireless receiver signals with low loss in a dual mode compatible mobile phone (cellular phone) or other mobile wireless communication apparatus having for example a triple band GSM system as a first communication system and for example a UMTS system as a second communication system is provided. A wireless signal switching circuit 1 has a signal route switch 20 of a F2 or F3 transmission and reception system, a signal route switching circuit 30 of an F1 or UMTS transmission and reception system having a diplexer 31, and a 90 degree phase rotation circuit 40. Note that the relationship of frequencies is F1?F2<F3. The 90 degree phase rotation circuit 40 has the characteristic that the phase of a signal of F2 or F3 is rotated by 90 degrees when a switch element 44 is set to a closed state, and a high frequency of UMTS is attenuated when the switch element 44 is set to an opening state.