High-frequency switch circuit, high-frequency switch module and wireless communication device
First Claim
1. A high-frequency switch circuit common to high-frequency signals of a plurality of frequency bands comprising:
- a first high-frequency switch connected to a first terminal for inputting and outputting high-frequency signals for passing a transmitting signal of a first frequency band or a transmitting signal of a second frequency band while blocking a received signal of said first frequency band and a received signal of said second frequency band; and
a branching circuit comprising a first high-frequency circuit comprising a first phase shifter connected to said first terminal and a first bandpass filter disposed downstream thereof, and a second high-frequency circuit comprising a second phase shifter connected to said first terminal and a second bandpass filter disposed downstream thereof, a transmission line for constituting said first phase shifter having such a line length that the impedance of said first high-frequency circuit viewed from the input side is substantially open at a passband frequency of said second bandpass filter, a transmission line for constituting said second phase shifter having such a line length that the impedance of said second high-frequency circuit viewed from the input side is substantially open at a passband frequency of said first bandpass filter, whereby one received signal in said first and second frequency bands is permitted to pass while the other received signal is shut off.
1 Assignment
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Accused Products
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. The transmission line in the first phaser has a line length such that the input impedance of the first high-frequency circuit is substantially open in the pass band of the second bandpass filter, whereas the transmission line in the second phaser has a line length such that the input impedance of the second high-frequency circuit is substantially open in the pass band of the first bandpass filter. Thus, the high-frequency switch circuit passes one of thc received signals of the first and second frequency bands and blocks the other
88 Citations
18 Claims
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1. A high-frequency switch circuit common to high-frequency signals of a plurality of frequency bands comprising:
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a first high-frequency switch connected to a first terminal for inputting and outputting high-frequency signals for passing a transmitting signal of a first frequency band or a transmitting signal of a second frequency band while blocking a received signal of said first frequency band and a received signal of said second frequency band; and
a branching circuit comprising a first high-frequency circuit comprising a first phase shifter connected to said first terminal and a first bandpass filter disposed downstream thereof, and a second high-frequency circuit comprising a second phase shifter connected to said first terminal and a second bandpass filter disposed downstream thereof, a transmission line for constituting said first phase shifter having such a line length that the impedance of said first high-frequency circuit viewed from the input side is substantially open at a passband frequency of said second bandpass filter, a transmission line for constituting said second phase shifter having such a line length that the impedance of said second high-frequency circuit viewed from the input side is substantially open at a passband frequency of said first bandpass filter, whereby one received signal in said first and second frequency bands is permitted to pass while the other received signal is shut off. - View Dependent Claims (2, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18)
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3. (Amended) A high-frequency switch circuit common to high-frequency signals of a plurality of frequency bands comprising:
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first and second filter circuits connected to an antenna terminal and having different passbands from each other;
a first high-frequency switch connected to said second filter circuit for passing a transmitting signal of a first frequency band or a transmitting signal of a second frequency band but blocking a received signal of said first frequency band and a received signal of said second frequency band;
a second high-frequency switch connected to said second filter circuit for passing a received signal of said first frequency band or a received signal of said second frequency band but blocking a transmitting signal of said first frequency band and a transmitting signal of said second frequency band;
a branching circuit connected to said second high-frequency switch for passing one received signal in said first and second frequency bands but blocking the other received signal, comprising a first high-frequency circuit comprising a first phase shifter connected to a terminal on the side of said second high-frequency switch and a first bandpass filter disposed downstream thereof, and a second high-frequency circuit comprising a second phase shifter connected to said terminal and a second bandpass filter disposed downstream thereof; and
a high-frequency switch circuit connected to said first filter circuit for switching a transmitting signal path and a received signal path of a third transmitting/receiving system.
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4. (Amended) A high-frequency switch circuit common to high-frequency signals of a plurality of frequency bands comprising:
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first and second filter circuits connected to an antenna terminal and having different passbands from each other;
a first high-frequency switch connected to said second filter circuit for switching a signal path for passing a transmitting signal of a first frequency band and a transmitting signal of a second frequency band, a signal path for passing a received signal of said first frequency band and a received signal of said second frequency band;
a branching circuit connected to said first high-frequency switch for passing one received signal of said first or second frequency band but blocking the other received signal, comprising a first high-frequency circuit comprising a first phase shifter connected to a terminal on the side of said first high-frequency switch and a first bandpass filter disposed downstream thereof, and a second high-frequency circuit comprising a second phase shifter connected to said terminal and a second bandpass filter disposed downstream thereof;
a high-frequency switch circuit connected to said first filter circuit for switching a transmitting signal path and a received signal path of a third transmitting/receiving system.
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5. A high-frequency switch circuit common to high-frequency signals of a plurality of frequency bands comprising:
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first and second filter circuits connected to an antenna terminal and having different passbands from each other;
a first high-frequency switch connected to said second filter circuit for passing a transmitting signal of a first frequency band or a transmitting signal of a second frequency band but blocking a received signal of said first frequency band and a received signal of said second frequency band;
a second high-frequency switch connected to said second filter circuit for passing a received signal of said first frequency band or a received signal of said second frequency band but blocking a transmitting signal of said first frequency band and a transmitting signal of said second frequency band;
a branching circuit connected to said second high-frequency switch for passing one received signal of said first or second frequency band but blocking the other received signal, comprising a first high-frequency circuit comprising a first phase shifter connected to a terminal on the side of said second high-frequency switch and a first bandpass filter disposed downstream thereof, and a second high-frequency circuit comprising a second phase shifter connected to said terminal and said second bandpass filter disposed downstream thereof;
a third high-frequency switch connected to said first filter circuit for passing a transmitting signal of a third frequency band or a transmitting signal of a fourth frequency band but blocking a received signal of said third frequency band and a received signal of said fourth frequency band;
a fourth high-frequency switch connected to said first filter circuit for passing a received signal of said third frequency band or a received signal of said fourth frequency band but blocking a transmitting signal of said third frequency band and a transmitting signal of said fourth frequency band; and
a branching circuit connected to a fourth high-frequency switch for passing one received signal of said third or fourth frequency band but blocking the other received signal, comprising a first high-frequency circuit comprising a first phase shifter connected to a terminal on the side of said fourth high-frequency switch and a first bandpass filter disposed downstream thereof, and a second high-frequency circuit comprising a second phase shifter connected to said terminal and a second bandpass filter disposed downstream thereof.
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6. A high-frequency switch circuit common to high-frequency signals of a plurality of frequency bands comprising:
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first and second filter circuits connected to an antenna terminal and having different passbands from each other, a first high-frequency switch connected to said second filter circuit for switching a signal path for passing a transmitting signal of a first frequency band and a transmitting signal of a second frequency band, and a signal path for passing a received signal of said first frequency band and a received signal of said second frequency band;
a branching circuit connected to said first high-frequency switch for passing one received signal of said first or second frequency band but blocking the other received signal, comprising a first high-frequency circuit comprising a first phase shifter connected to a terminal on the side of said first high-frequency switch and a first bandpass filter disposed downstream thereof, and a second high-frequency circuit comprising a second phase shifter connected to said terminal and a second bandpass filter disposed downstream thereof;
a second high-frequency switch connected to said first filter circuit for switching a signal path for passing a transmitting signal of a third frequency band and a transmitting signal of a fourth frequency band, and a signal path for passing a received signal of said third frequency band and a received signal of said fourth frequency band; and
a branching circuit connected to said second high-frequency switch for passing one received signal of said third or fourth frequency band but blocking the other received signal, comprising a first high-frequency circuit comprising a first phase shifter connected to a terminal on the side of said second high-frequency switch and a first bandpass filter disposed downstream thereof, and a second high-frequency circuit comprising a second phase shifter connected to said terminal and a second bandpass filter disposed downstream thereof.
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12. (Amended) A branching circuit module comprising a first high-frequency circuit comprising a first phase shifter connected to a first terminal for inputting and outputting high-frequency signals and a first bandpass filter disposed downstream thereof, and a second high-frequency circuit comprising a second phase shifter connected to said first terminal, and a second bandpass filter disposed downstream thereof, said first phase shifter and said second phase shifter being contained in a sintered laminate of dielectric green sheets, said first passband filter and said second passband filter being mounted onto said laminate.
Specification