Single-pole double-throw switch
AssigneeSumitomo Electric Industries, Ltd.
InventorOsamu ANEGAWA
Life of this patent
Estimating the term…
Abstract
A single-pole double-throw switch includes switching units which are set between a first port and a second port and between the first port and a third port, respectively, and are configured to perform complementarily. The each switching unit includes an antenna port, a circuit port, a transmission line configured to couple them, and a switching element connected between the transmission line and a ground. The switching element includes a parallel circuit including a transistor and an inductor connected in parallel, and a capacitor connected in series with the parallel circuit. The transmission line has a characteristic impedance different from a impedance seen inside the switching unit from the antenna port and a impedance seen inside the switching unit from the circuit port.
Claims9
A single-pole double-throw switch comprising:
- a first port;
- a second port;
- a third port;
- a first switching unit connected between the first port and the second port;
- the first switching unit including:
- a first antenna port connected to the first port,
- a first circuit port connected to the second port,
- a first transmission line configured to couple the first antenna port to the first circuit port, and
- a first switching element connected between the first transmission line and ground, the first switching element including:
- a first parallel circuit including a first transistor and a first inductor connected in parallel with the first transistor, the first parallel circuit being connected to the ground, and
- a first capacitor connected between the first transmission line and the first parallel circuit, and
- a second switching unit connected between the first port and the third port;
- the second switching unit including:
- a second antenna port connected to the first port,
- a second circuit port connected to the third port,
- a second transmission line configured to couple the second antenna port to the second circuit port, and
- a second switching element connected between the second transmission line and the ground, the second switching element including:
- a second parallel circuit including a second transistor and a second inductor connected in parallel with the second transistor, the second parallel circuit being connected to the ground, and
- a second capacitor connected between the second transmission line and the second parallel circuit,
- wherein the first transmission line has a characteristic impedance different from each of a first impedance seen from the first antenna port and a second impedance seen from the first circuit port, and
- wherein the second transmission line has a characteristic impedance different from each of the first impedance seen from the second antenna port and a third impedance seen from the second circuit port.
Dependencies are inferred from the claim text.