Patent ID: 8160511
Filing Date: 2012-04-17
Classification: H04B

Abstract:
1. A low-voltage control high-frequency switch, comprising: a first signal input/output portion arranged to input transmission signals of a plurality of communication systems having different frequency bands or to output reception signals thereof; second and third signal input/output portions arranged to output reception signals of at least two communication systems of the plurality of communication systems or input transmission signals thereof; a shared signal input/output portion for the plurality of communication systems; a second high frequency switch arranged to switch between reception signals or transmission signals to or from the second and third signal input/output portions; and a first high frequency switch arranged to switch between reception signals or transmission signals from the shared signal input/output portion to the first signal input/output portion or between reception signals or transmission signals from the second high frequency switch to the shared signal input/output portion; wherein the low-voltage control high-frequency switch includes a first signal transmission line located between the shared signal input/output portion and the first signal input/output portion, a second signal transmission line located between the shared signal input/output portion and the second high frequency switch, a third signal transmission line located between the shared signal input/output portion for the second high frequency switch and the second signal input/output portion, and a fourth signal transmission line between the shared signal input/output portion for the second high frequency switch and the third signal input/output portion; the first high frequency switch includes a first current path through which a direct current passes and which includes a first diode and a second current path through which a direct current passes and which includes a second diode; the second high frequency switch includes a third current path through which a direct current passes and which includes a third diode and a fourth current path through which a direct current passes and which includes a fourth diode; the first diode is disposed in series on the first signal transmission line, the second diode is disposed in shunt on the second signal transmission line, the first and second current paths define a first parallel connection circuit, and one junction point of the first parallel connection circuit defines a first control voltage input portion; the third diode is disposed in series on the third signal transmission line, the fourth diode is disposed in shunt on the fourth signal transmission line, the third and fourth current paths define a second parallel connection circuit, and one junction point of the second parallel connection circuit defines a second control voltage input portion; a shared inductor through which the direct currents passing through the first to fourth current paths pass in common is disposed between the other junction points of the first and second parallel connection circuits and ground; and an energizing direction of the direct current flowing into the shared inductor through the first and second current paths and an energizing direction of the direct current flowing into the shared inductor through the third and fourth current paths are the same.