Switch and its usage

A switch for selectively connecting at least one of a plurality of inputs to a predetermined output, the switch comprising:

• a plurality of high frequency lines for high-frequency connecting each of the inputs and the output;
• a switching circuit provided for each of the high frequency lines for selectively blocking, line-by-line, the high-frequency connection;
• and
• a drive circuit for driving the switching circuit, wherein
• each switching circuit comprises a semiconductor element for conducting or blocking in response to a bias voltage,
• the drive circuit is a circuit for applying the bias voltage to the semiconductor element in the corresponding switching circuit,
• at lease one switching circuit among the switching circuits is a series circuit in which the semiconductor element is inserted in a central conductor of the corresponding high frequency line such that, when the semiconductor element is conductive, transmission through the high frequency line is allowed and when the semiconductor element is not conductive, the transmission is blocked, and the other switching circuits are shunt circuits in which the semiconductor element is inserted between the central conductor and a grounding conductor of the corresponding high frequency line such that, when the semiconductor element is conductive, the transmission through the high frequency line is blocked and when the semiconductor element is not conductive, the transmission is allowed;
• a series circuit is provided as the switching circuit in one or more of the plurality of high frequency lines connected to the same input or output and a shunt circuit is provided as the switching element in each of the remaining high frequency lines;
• a drive circuit is provided corresponding to the series circuit and a bias voltage supply route from the drive circuit to the shunt circuit is provided corresponding to the shunt circuit;
• and
• a capacitor for direct-current blocking the input or the output with respect to the drive circuit is provided in the input, in the output, or on the high frequency circuit, in order to cause a line portion, among the plurality of high frequency lines, from a series circuit provision position to a shunt circuit provision position, to function as the bias voltage supply route from the drive circuit provided corresponding to the series circuit to the shunt circuit.

A switch for selectively connecting at least one of a plurality of inputs to a predetermined output, the switch comprising:

• a plurality of high frequency lines for high-frequency connecting each of the inputs and the output;
• a switching circuit provided for each of the high frequency lines for selectively blocking, line-by-line, the high-frequency connection;
• and
• a drive circuit for driving the switching circuit, wherein
• the switching circuit has a semiconductor element which conducts or blocks in response to a bias voltage;
• the drive circuit is a circuit for applying the bias voltage to the semiconductor element in the corresponding switching circuit;
• at least one of the switching circuits is a shunt circuit in which the semiconductor element is inserted between a central conductor and a grounding conductor of the corresponding high frequency circuit such that, when the semiconductor element is conductive, a transmission through the high frequency line is blocked and when the semiconductor is non conductive, the transmission is allowed;
• and
• a line portion on the high frequency line which includes a shunt circuit provision position, extends on a side of the input and a side of the output of the shunt circuit provision position and has an electrical length of a natural number multiple of λ/2 is a line portion having a lower intrinsic impedance compared to line portions on the side of the input and on the side of the output seen from the line portion, wherein λ is a carrier wavelength of a signal transmitting through the high frequency line.