Patent ID: 8334731

Claim:
A high-frequency module comprising: at least first and second signal circuits; a common antenna port; and at least first and second signal ports, each of the at least first and second signal circuits being connected between the common antenna port and the at least first and second signal ports; wherein the first signal circuit includes: a first inductor connected in series between the antenna port and the first signal port; a first capacitor connected in series between the first inductor and the first signal port; and a second inductor connected in shunt between the first capacitor and the first signal port; a first switch element, a first end of which is connected between the first inductor and the first capacitor; a second capacitor connected in series between a second end of the first switch element and ground; and a second switch element connected in series between the antenna port and the second signal port; the first signal circuit is arranged to produce series resonance between the first inductor, the first capacitor, and the second inductor at a frequency within the frequency band of a target signal of the second signal circuit; the first inductor includes a line having an electrical length that is equal to about one fourth of the wavelength of a signal propagated between the antenna port and the second signal port; and the first signal circuit is arranged to produce the series resonance between the second capacitor and the inductance occurring in the first switch element during the operation of the first switch element at a frequency within the frequency band of the signal propagated between the antenna port and the second signal port.