Abstract: A switch circuit for selectively switching connection of an antenna side circuit with a reception circuit and a transmission circuit of two communication systems one of which has a reception frequency band partially overlapped with a transmission frequency of the other. The switch circuit includes (a) a first switch unit for switching connection of the antenna side circuit with the transmission circuit side of the first and tie second communication systems and the reception circuit side of the first and the second communication system and (b) a second switch unit connected between the first switch unit and the reception circuit of the first and the second communication system for switching connection of the antenna side circuit with the reception circuit of the first and the second communication system. (c) The transmission circuit side of the first and the second communication system of the first switch unit is connected to a transmission circuit shared by the first and the second communication system.

Abstract: A high-frequency switch circuit is provided for switching a connection between a common transmission circuit and an antenna side circuit in a plurality of transmitting and receiving systems. The high-frequency switch includes a connection between the antenna side circuit and a reception circuit in one of the plurality of transmitting and receiving systems, and a connection between the antenna side circuit and a reception circuit in the other of the plurality of transmitting and receiving systems, the high-frequency switch circuit comprising a first diode, a second diode, and a distributed constant line, wherein a third diode is connected to the first and second diodes through the distributed constant line.

Abstract: A high-frequency circuit for use in a dual-band wireless communications apparatus selectively using first and second frequency bands, comprising a diplexer connected to the output of a power amplifier for sending either one of transmission signals in the first and second frequency bands to an antenna, a coupler having a primary line connected to a common end of the diplexer and a secondary line, a detector comprising a detection diode for detecting a transmission power of a high-frequency signal sent from the secondary line of the coupler, and a harmonics-suppressing circuit disposed between the secondary line of the coupler and the detection diode.

Abstract: A switch circuit for switching the connection of the receiving or transmitting circuits of two communication systems to an antenna circuit, which comprises first and second switch means having two switching elements, the first switch means comprising a first inductance element between a port connected to the antenna circuit and a port connected to the second switch means; the second switch means comprising a second inductance element between a port connected to the first switch means and a port connected to a receiving circuit of a first communication system, and a transmission line constituting the first inductance element having a lower characteristic impedance than that of a transmission line constituting the second inductance element.

Abstract: A multi-band antenna switch circuit including a diplexer connected to an antenna terminal for demultiplexing signals of different passing bands, a first and a second switch circuit for switching a high frequency signal and a low frequency signal demultiplexed by the diplexer to a plurality of transmission/reception terminals, a first and a second low pass filter connected to a transmission path between the diplexer and the transmission terminal or between the first and the second switch circuit and the transmission terminal, and a notch filter provided between the diplexer and the first switch circuit or between the diplexer and the second switch circuit.

Abstract: A laminated high-frequency switch module for selecting either a transmission circuit or a reception circuit of each of transmission/reception systems by switching, comprising a demultiplexer for demultiplexing signals of the transmission/reception systems, high-frequency switch circuits for selecting either the signal path of a reception signal from the demultiplexer to the reception circuit or the signal path of a transmission signal from the transmission circuit to the demultiplexer, and circuit for measuring the power of the transmission signal from the transmission circuit, characterized in that the laminate is composed of dielectric layers having electrode patterns, and the demultiplexer, the high-frequency switch circuits, and the power measuring circuit are constituted of electrode patterns in the laminate.

Abstract: A high-frequency module is connected to a transmitting circuit, a receiving circuit, and an antenna to control the connections between the transmitting circuit and the antenna and between the receiving circuit and the antenna. The module includes means for controlling transmitted signals, which includes a first phase-shift circuit and a high-frequency amplifier provided between the antenna and the transmitting circuit. The high-frequency amplifier and the first phase-shift circuit are integrated into a module composed of a plurality of dielectric layers.

Abstract: An unbalanced-balanced multiband filter module comprising three high-frequency switches each comprising a switching element, and two unbalanced-balanced bandpass filters having different transmitting frequency bands, a first high-frequency switch being connected to an unbalanced port of the module, an unbalanced port of the first unbalanced-balanced bandpass filter, and an unbalanced port of the second unbalanced-balanced bandpass filter; a second high-frequency switch being connected to a first balanced port of the module, a first balanced port of the first unbalanced-balanced bandpass filter, and a first balanced port of the second unbalanced-balanced bandpass filter; a third high-frequency switch being connected to a second balanced port of the module, a second balanced port of the first unbalanced-balanced bandpass filter, and a second balanced port of the second unbalanced-balanced bandpass filter; and the first to third high-frequency switches being switched depending on a passing high-frequency signal,

Abstract: A high-frequency switch circuit common to a plurality or frequency bands comprises a first high-frequency switch connected to first high-frequency signal input and output terminals and adapted to pass transmission signals of a first or a second frequency band and block received signals of the first and second frequency band; and a demultiplexer has a first high-frequency circuit which consists of a first phaser connected to the first terminal and a first bandpss filter succeeding to the first phaser, and a second high-frequency circuit which consists of a second phaser connected to the first terminal and a second bandpass filter succeeding to the second phaser.

Abstract: A high-frequency switch circuit common to a plurality of frequency bands includes a first high-frequency switch adapted to pass transmission signals and block received signals; and a demultiplexer. The high-frequency switch circuit passes one of the received signals of first and second frequency bands and blocks the other.

Abstract: A high-frequency switch module comprising one band-separating circuit and two switch circuits, the first switch circuit being connected to one circuit separated by the band-separating circuit, and the second switch circuit being connected to the other circuit thereof; the first switch circuit being a circuit for switching a transmission system and a reception system for a first transmitting and receiving system; and the second switch circuit being a circuit for switching a transmission system and a reception system for a second transmitting and receiving system and a transmission system and a reception system for a third transmitting and receiving system.

Abstract: A high-frequency switch circuit is provided for switching a connection between a common transmission circuit and antenna side circuit in a plurality of transmitting and receiving systems. The high-frequency switch includes a connection between the antenna side circuit and a reception circuit in one of the plurality of transmitting and receiving systems, and a connection between the antenna side circuit and a reception circuit in the other of the plurality of transmitting and receiving systems, the high-frequency switch circuit comprising a first diode; a first distributed constant line; a second diode; a capacitor; a third diode; a second distributed constant line; and a fourth diode.

Abstract: A high-frequency switch circuit is provided for switching a connection between a common transmission circuit and an antenna side circuit in a plurality of transmitting and receiving systems. The high-frequency switch includes a connection between the antenna side circuit and a reception circuit in one of the plurality of transmitting and receiving systems, and a connection between the antenna side circuit and a reception circuit in the other of the plurality of transmitting and receiving systems, the high-frequency switch circuit comprising a first diode, a second diode, and a distributed constant line, wherein a third diode is connected to the first and second diodes through the distributed constant line.

Abstract: A high-frequency module is connected to a transmitting circuit (TX), a receiving circuit (RX) and an antenna (ANT) to control the connections between the transmitting circuit (TX) and the antenna (ANT) and between the receiving circuit (RX) and the antenna (ANT). The module comprises means (2) for controlling transmitted signals, which includes a first phase-shift circuit (5) and a high-frequency amplifier (4) provided between the antenna (ANT) and the transmitting circuit (TX). The high-frequency amplifier (4) and the first phase-shift circuit (5) are integrated into a module composed of a plurality of dielectric layers.

Abstract: A switch circuit for selectively switching connection of an antenna side circuit with a reception circuit and a transmission circuit of two communication systems one of which has a reception frequency band partially overlapped with a transmission frequency of the other. The switch circuit includes (a) a first switch unit for switching connection of the antenna side circuit with the transmission circuit side of the first and tie second communication systems and the reception circuit side of the first and the second communication system and (b) a second switch unit connected between the first switch unit and the reception circuit of the first and the second communication system for switching connection of the antenna side circuit with the reception circuit of the first and the second communication system. (c) The transmission circuit side of the first and the second communication system of the first switch unit is connected to a transmission circuit shared by the first and the second communication system.

Abstract: A high-frequency module is connected to a transmitting circuit (TX), a receiving circuit (RX) and an antenna (ANT) to control the connections between the transmitting circuit (TX) and the antenna (ANT) and between the receiving circuit (RX) and the antenna (ANT). The module comprises means (2) for controlling transmitted signals, which includes a first phase-shift circuit (5) and a high-frequency amplifier (4) provided between the antenna (ANT) and the transmitting circuit (TX). The high-frequency amplifier (4) and the first phase-shift circuit (5) are integrated into a module composed of a plurality of dielectric layers.

Abstract: A multi-band antenna switch circuit including a diplexer connected to an antenna terminal for demultiplexing signals of different passing bands, a first and a second switch circuit for switching a high frequency signal and a low frequency signal demultiplexed by the diplexer to a plurality of transmission/reception terminals, a first and a second low pass filter connected to a transmission path between the diplexer and the transmission terminal or between the first and the second switch circuit and the transmission terminal, and a notch filter provided between the diplexer and the first switch circuit or between the diplexer and the second switch circuit.

Abstract: An antenna switch module connected to a common antenna for switching the connection of the antenna to a transmission circuit or a receiving circuit in plural transmitting/receiving systems having different passbands, comprising a diplexer circuit comprising a low-pass filter and a high-pass filter; a first switch circuit connected to the low-pass filter and for switching a transmitting line and a receiving line, a second switch circuit connected to the high-pass filter for switching a transmitting line and a receiving line; a third switch circuit connected to the first switch circuit for switching the receiving line from the first switch circuit; and a fourth switch circuit connected to the second switch circuit for switching the receiving line from the second switch circuit; at least part of transmission lines constituting LC circuits in the diplexer circuit and the first and second switch circuits being electrode patterns formed in a multilayer substrate constituted by plural dielectric layers; and chip ele

Abstract: A high-frequency switch module which comprises a high-frequency switch circuit connected among an antenna, a transmission circuit, and a reception circuit and comprising switching elements and a surface acoustic wave filter connected between the high-frequency switch circuit and the reception circuit, uses a laminate constituted of dielectric layers having electrode patterns as the multilayered board, and has a phase correction circuit disposed between the switch circuit and the surface acoustic wave filter, wherein the high-frequency switch circuit comprises a switching element, a transmission line, and a capacitor as main elements, with at least a part of the transmission line and the capacitor constituted of an electrode pattern in the laminate, and with the surface acoustic wave filter mounted on the laminate.

Abstract: A laminated high-frequency switch module for selecting either transmission circuit or a reception circuit of each of transmission/reception systems by switching, comprising a demultiplexer for demultiplexing signals of the transmission/reception systems, high-frequency switch circuits for selecting either the signal path of a reception signal from the demultiplexer to the reception circuit or the signal path of a transmission signal from the transmission circuit to the demultiplexer, and means for measuring the power of the transmission signal from the transmission circuit, characterized in that the laminate is composed of dielectric layers having electrode patterns, and the demultiplexer, the high-frequency switch circuits, and the power measuring means are constituted of electrode patterns in the laminate.