US5477532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio transceiver
Assignee: Kokusai Denki Electric Inc
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Filing: 1993-10-15
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Granted: 1995-12-19
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Expires: 2013-10-15
Abstract
Abstract A radio transceiver is disclosed in which an antenna is connected to a transmitter or a receiver through a duplexer. A controller is provided to control the switching operation of the duplexer so that when an output of the receiver exceeds a predetermined maximum threshold level of the receiver, the antenna is connected to the transmitter through the duplexer while a leakage received power of the duplexer is applied to the input of the receiver.
Inventors
- 👤 Hiroshi Hoshigami
- 👤 Atsushi Utsugi
- 👤 Mikio Takano
- 👤 Yoichi Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:49
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/10; H04B1/109; H04B1/16; H04B1/18; H04B1/38; H04B1/40; H04B1/44; H04B1/50; H04B1/52; H04B1/525; H04B1/54; H04B1/56
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
157 words
A radio transceiver comprising: a transmitter; a receiver; an antenna; a duplexer for switching the antenna to an output of the transmitter or an input of the receiver; a controller for developing a control output of a state I when received signal strength level reduces below a predetermined threshold level and for developing the control output of a state II when the received signal strength level exceeds a predetermined maximum threshold input level of the receiver greater than said predetermined threshold level; a switch controller for activating the duplexer so that the antenna is connected to the input of the receiver in response to the control output of the state I from the controller, and the antenna is connected to the output of the transmitter through the duplexer while a leakage received power through the duplexer from the antenna is applied to the input of the receiver in response to the control output of the state II.
Claim 2
Dependent Claim
157 words
A radio transceiver comprising: a transmitter; a receiver; an antenna; a duplexer for switching the antenna to an output of the transmitter or an input of the receiver; a controller for developing a control output of a state I when received signal strength level reduces below a predetermined threshold level and for developing the control output of a state II when the received signal strength level exceeds a predetermined maximum threshold input level of the receiver greater than said predetermined threshold level; a switch controller for activating the duplexer so that the antenna is connected to the input of the receiver in response to the control output of the state I from the controller, and the antenna is connected to the output of the transmitter through the duplexer while a leakage received power through the duplexer from the antenna is applied to the input of the receiver in response to the control output of the state II.
Claim 3
Dependent Claim
187 words
In a radio transceiver, comprising a radio transmitter; a receiver; an antenna; a duplexer connected between the transmitter and the receiver for selectively coupling the antenna to the transmitter during transmission and selectively coupling the antenna to the receiver during reception; the improvement which comprises: a controller for developing a control output of a state when a received signal strength level reduces below a predetermined threshold level and for developing the control output of a state II when the received signal strength level exceeds a predetermined maximum threshold input level of the receiver greater than said predetermined threshold level; a switch controller for coupling the antenna to said transmitter and to said receiver during transmission and reception operations respectively of the transceiver and activating said duplexer to couple said antenna to said receiver in response to the control output of the state I from the controller and to couple the antenna to the transmitter in response to the control output of the state II from the controller so that a leakage received power through said duplexer from said antenna is provided as an input to said receiver.
Claim 4
Dependent Claim
187 words
In a radio transceiver, comprising a radio transmitter; a receiver; an antenna; a duplexer connected between the transmitter and the receiver for selectively coupling the antenna to the transmitter during transmission and selectively coupling the antenna to the receiver during reception; the improvement which comprises: a controller for developing a control output of a state when a received signal strength level reduces below a predetermined threshold level and for developing the control output of a state II when the received signal strength level exceeds a predetermined maximum threshold input level of the receiver greater than said predetermined threshold level; a switch controller for coupling the antenna to said transmitter and to said receiver during transmission and reception operations respectively of the transceiver and activating said duplexer to couple said antenna to said receiver in response to the control output of the state I from the controller and to couple the antenna to the transmitter in response to the control output of the state II from the controller so that a leakage received power through said duplexer from said antenna is provided as an input to said receiver.
References Cited (Backward Citations)
US4525863A
Cited
US4853972A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-12-18 | 1999-06-19 | 1999-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-18 | 2003-06-19 | 2003-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-18 | 2007-06-19 | 2007-12-19 | $7700.00 | Window Closed / Lapsed |