HIGH-FREQUENCY CIRCUIT, HIGH-FREQUENCY DEVICE AND COMMUNICATIONS APPARATUS
First Claim
1. A high-frequency circuit for wireless communications selectively using at least a first frequency band and a second frequency band lower than said first frequency band, comprisingan antenna terminal;
- a first transmission terminal to which a transmitting signal in said first frequency band is input;
a second transmission terminal to which a transmitting signal in said second frequency band is input;
a first receiving terminal from which a received signal in said first frequency band is output;
a second receiving terminal from which a received signal in said second frequency band is output;
a switch circuit for switching the connection of said antenna terminal to said first and second transmission terminals and the connection of said antenna terminal to said first and second receiving terminals;
a first diplexer circuit disposed between said switch circuit and said first and second transmission terminals;
a second diplexer circuit disposed between said switch circuit and said first and second receiving terminals;
a first power amplifier circuit disposed between said first diplexer circuit and said first transmission terminal;
a second power amplifier circuit disposed between said first diplexer circuit and said second transmission terminal;
a low-noise amplifier circuit disposed between said switch circuit and said second receiving terminal for amplifying at least a received signal in said second frequency band;
a first highpass filter disposed between said antenna terminal and said switch circuit; and
a second highpass filter circuit disposed between said switch circuit and said low-noise amplifier circuit,both highpass filter circuits passing a received signal in said second frequency band but blocking a frequency band lower than said second frequency band, and a band blocked by said first highpass filter circuit being lower than a band blocked by said second highpass filter circuit.
1 Assignment
0 Petitions
Accused Products
Abstract
A high-frequency circuit for wireless communications selectively using a first frequency band and a second frequency band lower than the first frequency band, comprising an antenna terminal; first and second transmission terminals to which transmitting signals in the first and second frequency bands are input; first and second receiving terminals from which received signals in the first and second frequency bands are output; a diplexer circuit for branching a first-frequency-band-signal path and a second-frequency-band-signal path; a switch circuit for switching a path for a transmitting signal and a path for a received signal; a low-noise amplifier circuit disposed between the switch circuit and the second receiving terminal for amplifying a received signal in the second frequency band; and first and second filter circuits disposed between the antenna terminal and the low-noise amplifier circuit in this order from the antenna terminal, both filter circuits passing a received signal in the second frequency band but blocking a frequency band lower than the second frequency band, and the band blocked by the first filter circuit being lower than the band blocked by the second filter circuit.
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Citations
18 Claims
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1. A high-frequency circuit for wireless communications selectively using at least a first frequency band and a second frequency band lower than said first frequency band, comprising
an antenna terminal; -
a first transmission terminal to which a transmitting signal in said first frequency band is input; a second transmission terminal to which a transmitting signal in said second frequency band is input; a first receiving terminal from which a received signal in said first frequency band is output; a second receiving terminal from which a received signal in said second frequency band is output; a switch circuit for switching the connection of said antenna terminal to said first and second transmission terminals and the connection of said antenna terminal to said first and second receiving terminals; a first diplexer circuit disposed between said switch circuit and said first and second transmission terminals; a second diplexer circuit disposed between said switch circuit and said first and second receiving terminals; a first power amplifier circuit disposed between said first diplexer circuit and said first transmission terminal; a second power amplifier circuit disposed between said first diplexer circuit and said second transmission terminal; a low-noise amplifier circuit disposed between said switch circuit and said second receiving terminal for amplifying at least a received signal in said second frequency band; a first highpass filter disposed between said antenna terminal and said switch circuit; and a second highpass filter circuit disposed between said switch circuit and said low-noise amplifier circuit, both highpass filter circuits passing a received signal in said second frequency band but blocking a frequency band lower than said second frequency band, and a band blocked by said first highpass filter circuit being lower than a band blocked by said second highpass filter circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 17, 18)
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8. A high-frequency circuit for wireless communications selectively using at least a first frequency band and a second frequency band lower than said first frequency band, comprising
an antenna terminal; -
a first transmission terminal to which a transmitting signal in said first frequency band is input; a second transmission terminal to which a transmitting signal in said second frequency band is input; a first receiving terminal from which a received signal in said first frequency band is output; a second receiving terminal from which a received signal in said second frequency band is output; a first diplexer circuit disposed between said switch circuit and said first and second transmission terminals; a second diplexer circuit disposed between said switch circuit and said first and second receiving terminals; a first power amplifier circuit disposed between said first diplexer circuit and said first transmission terminal; a second power amplifier circuit disposed between said first diplexer circuit and said second transmission terminal; a first low-noise amplifier circuit disposed between said second diplexer circuit and said first receiving terminal; a second low-noise amplifier circuit disposed between said second diplexer circuit and said second receiving terminal for amplifying a received signal in said second frequency band; a highpass filter circuit disposed between said antenna terminal and said switch circuit; and a bandpass filter circuit disposed between said second diplexer circuit and said second low-noise amplifier circuit, both filter circuits passing a received signal in said second frequency band but blocking at least a frequency band lower than said second frequency band, and a band blocked by said highpass filter circuit being lower than a band blocked by said bandpass filter circuit. both filter circuits passing a received signal in said second frequency band but blocking at least a frequency band lower than said second frequency band, and a band blocked by said highpass filter circuit being lower than a band blocked by said bandpass filter circuit. - View Dependent Claims (9, 10, 11, 12)
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13. A high-frequency circuit for wireless communications selectively using at least a first frequency band and a second frequency band lower than said first frequency band, comprising
an antenna terminal; -
a first transmission terminal to which a transmitting signal in said first frequency band is input; a second transmission terminal to which a transmitting signal in said second frequency band is input; a first receiving terminal from which a received signal in said first frequency band is output; a second receiving terminal from which a received signal in said second frequency band is output; a diplexer circuit for branching a signal input from said antenna terminal to a circuit for said first frequency band and a circuit for said second frequency band, and transmitting signals from circuits for said first and second frequency bands to said antenna terminal; a first switch circuit disposed on the first frequency band circuit side of said diplexer circuit for switching a transmission path and a receiving path; a first power amplifier circuit disposed between said first switch circuit and said first transmission terminal; a first low-noise amplifier circuit disposed between said first switch circuit and said first receiving terminal; a second switch circuit disposed on the second frequency band circuit side of said diplexer circuit for switching a transmission path and a receiving path;
a second power amplifier circuit disposed between said second switch circuit and said second transmission terminal;a second low-noise amplifier circuit disposed between said second switch circuit and said second receiving terminal for amplifying a received signal in said second frequency band; a highpass filter circuit disposed between said antenna terminal and said diplexer circuit; and a bandpass filter circuit disposed between said diplexer circuit and said the second switch circuit, both filter circuits passing a received signal in said second frequency band but blocking at least a frequency band lower than said second frequency band, and a band blocked by said highpass filter circuit being lower than a band blocked by said bandpass filter circuit. - View Dependent Claims (14, 15, 16)
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Specification