High-frequency circuit and communication device
First Claim
1. A high-frequency circuit comprising:
- first duplexers, each including;
a first transmit filter having a first transmit band,a first receive filter having a first receive band, anda first common terminal to which a first end of the first transmit filter and a first end of the first receive filter are commonly connected;
a first switch that selects and connects one of the first common terminals to a first antenna;
an LPF (low pass filter) or BPF (band pass filter) that is connected between the first antenna and the first switch, and passes a signal in the first transmit band and the first receive band; and
a second duplexer including;
a second transmit filter having a second transmit band higher in frequency than the first transmit band,a second receive filter having a second receive band higher in frequency than the first receive band, anda second common terminal that is connected to a second antenna and to which a first end of the second transmit filter and a first end of the second receive filter are commonly connected,wherein a transmit of a transmit signal of the first transmit band and a receive of a receive signal of the second receive band are performed simultaneously, andwherein a frequency of a second order harmonics or a third order harmonics of the transmit signal overlaps the second receive band.
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Accused Products
Abstract
A high-frequency circuit includes: first duplexers, each including a first transmit filter having a first transmit band, a first receive filter having a first receive band, and a first common terminal to which first ends of the first transmit filter and the first receive filter are commonly connected; a first switch that selects and connects one of the first common terminals to a first antenna; an LPF or BPF that is connected between the first antenna and the first switch, and passes a signal in the first transmit band and the first receive band; and a second duplexer including: a second transmit filter having a second transmit band, a second receive filter having a second receive band, and a second common terminal that is connected to a second antenna and to which first ends of the second transmit filter and the second receive filter are commonly connected.
14 Citations
8 Claims
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1. A high-frequency circuit comprising:
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first duplexers, each including; a first transmit filter having a first transmit band, a first receive filter having a first receive band, and a first common terminal to which a first end of the first transmit filter and a first end of the first receive filter are commonly connected; a first switch that selects and connects one of the first common terminals to a first antenna; an LPF (low pass filter) or BPF (band pass filter) that is connected between the first antenna and the first switch, and passes a signal in the first transmit band and the first receive band; and a second duplexer including; a second transmit filter having a second transmit band higher in frequency than the first transmit band, a second receive filter having a second receive band higher in frequency than the first receive band, and a second common terminal that is connected to a second antenna and to which a first end of the second transmit filter and a first end of the second receive filter are commonly connected, wherein a transmit of a transmit signal of the first transmit band and a receive of a receive signal of the second receive band are performed simultaneously, and wherein a frequency of a second order harmonics or a third order harmonics of the transmit signal overlaps the second receive band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification
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- Resources
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Current AssigneeTaiyo Yuden Company Limited (Taiyo Yuden Co)
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Original AssigneeTaiyo Yuden Company Limited (Taiyo Yuden Co)
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InventorsMatsuo, Nobuaki, Murata, Ryuji, Matsubayashi, Yuki
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Primary Examiner(s)Sefcheck, Gregory
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Assistant Examiner(s)Van, Jenkey
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Application NumberUS13/950,569Publication NumberTime in Patent Office922 DaysField of SearchNoneUS Class Current1/1CPC Class CodesH04B 1/006 using switches for selectin...H04B 1/0064 with separate antennas for ...H04B 1/0458 Arrangements for matching a...H04B 1/18 Input circuits, e.g. for co...H04B 1/50 using different frequencies...
