Patent ID: 8717247

Claim:
A front-end circuit comprising: a first antenna port; a first antenna switch that is electrically connected to the first antenna port; a second antenna port; an antenna termination circuit that is electrically connected to the first antenna switch, wherein the antenna termination circuit comprises an impedance element selected from the group consisting of a resistance element, a capacitive element and an inductive element; a signal path configured to propagate receive signals from the first or second antenna port or transmit signal to the first or second antenna port; and a filter having passive elements coupled in the signal path, the filter comprising a band-pass filter, a high-pass filter, or a low-pass filter, wherein the impedance element of the antenna termination circuit comprises the filter; wherein the first antenna switch is configured to electrically connect the first antenna port to the antenna termination circuit when the signal path is electrically connected to the second antenna port.