Soshin Electric Co., Ltd.

Akira Ando

Provided is a high frequency switch wherein first switch circuits, each of which includes a first PIN diode, are connected in parallel to one or more first &#x3bb;/4 signal transmitting paths which transmit transmitting signals, and second switch circuits, each of which includes a second PIN diode, are connected in parallel to one or more second &#x3bb;/4 signal transmitting paths which transmit receiving signals to a receiving terminal. A first control voltage is applied to the cathode of the first PIN diode, and a second control voltage is applied to the cathode of the second PIN diode. Furthermore, a biasing circuit which applies a constant bias voltage is connected to each anode of the first PIN diode and the second PIN diode.

High frequency switch

Provided is a high-frequency switch formed by a first switch circuit connected in parallel to a first &#x3bb;/4 signal transmission path for transmitting a transmission signal from a transmission terminal and a second switch circuit connected in parallel to a second &#x3bb;/4 signal transmission path for transmitting a reception signal to a reception terminal. The high-frequency switch further includes a directivity coupler which has the first &#x3bb;/4 signal transmission path as a constituent element and detects a reflected wave of the transmission signal. The directivity coupler includes: the first &#x3bb;/4 signal transmission path; a &#x3bb;/4 signal line arranged to oppose to the first &#x3bb;/4 signal transmission path; a reflected wave output terminal connected to one end of the &#x3bb;/4 signal line; and a terminal resistor connected to the other end of the &#x3bb;/4 signal line.

High-frequency switch

Disclosed is a high frequency switch wherein a first switch circuit is connected in series to a first &#x3bb;/4 signal transmission path connected between an antenna connecting terminal and a transmission terminal. In the first switch circuit, a first &#x3bb;/4 transmission path and a first parallel resonant circuit, which includes one first PIN diode, are connected in series. In a first inductor of the first parallel resonant circuit, a constant is set so that a resonance frequency of the first parallel resonant circuit and the center frequency of a first antenna switch are the same when the first PIN diode is turned off.

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Urayasu, Japan

Akira Ando