US4637065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broadband solid state antenna switch
Assignee: Motorola Solutions Inc
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Filing: 1986-04-14
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Granted: 1987-01-13
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Expires: 2006-04-14
Abstract
Abstract In accordance with the present invention there is provided a common antenna signal path selectively coupled to a plurality of signal energy paths, including transmitter and receiver paths. The transmitter and receiver paths are selectively coupled to the common antenna signal path by semiconductive devices capable of being variably biased from conductive to nonconductive states. In the transmit mode, the magnitude of the RF signal energy is detected and developed to adaptively maintain the disabled semiconductive device in a reverse biased or nonconducting state.
Inventors
- 👤 John S. Ruppel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:25
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/44; H04B1/48
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
175 words
A broadband solid state RF switch circuit for electrically coupling a common signal path alternately to a transmitter and to a receiver and having a high power handling capability while utilizing relatively low supply voltage, the RF switch circuit comprising in combination: first selective conducting means for electrically coupling a first signal energy path to said common signal path and controlled by a first biasing voltage; second selective conducting means for electrically coupling a second signal energy path to said common signal path in alternate fashion to said first selective conducting means and controlled by a second biasing voltage; and strong RF signal detecting means electrically coupled to said second selective conducting means for providing a reverse bias voltage electrically coupled back to said first selective conducting means, said strong RF signal detecting means adaptively tracking the magnitude of said strong RF signal at said second selective conducting means to supply adequate, variable, reverse bias voltage thereto, thereby ensuring that said first selective conducting means remains switched off to enhance the power handling capability thereof.
Claim 2
Dependent Claim
175 words
A broadband solid state RF switch circuit for electrically coupling a common signal path alternately to a transmitter and to a receiver and having a high power handling capability while utilizing relatively low supply voltage, the RF switch circuit comprising in combination: first selective conducting means for electrically coupling a first signal energy path to said common signal path and controlled by a first biasing voltage; second selective conducting means for electrically coupling a second signal energy path to said common signal path in alternate fashion to said first selective conducting means and controlled by a second biasing voltage; and strong RF signal detecting means electrically coupled to said second selective conducting means for providing a reverse bias voltage electrically coupled back to said first selective conducting means, said strong RF signal detecting means adaptively tracking the magnitude of said strong RF signal at said second selective conducting means to supply adequate, variable, reverse bias voltage thereto, thereby ensuring that said first selective conducting means remains switched off to enhance the power handling capability thereof.
Claim 3
Dependent Claim
16 words
The RF switch circuit according to claim 1 wherein said common signal path comprises an antenna.
Claim 4
Dependent Claim
26 words
The RF switch circuit according to claim 1 wherein said first and second signal paths comprise a receiver signal path and a transmitter signal path respectively.
Claim 5
Dependent Claim
60 words
The RF switch circuit according to claim 1 wherein each of said first and second selective conducting means comprises: first and second PIN diodes having one similar lead of each coupled to a common point; and RF signal decoupling means for applying the biasing voltages to said first and second PIN diodes while remaining decoupled from the RF signals thereon.
Claim 6
Dependent Claim
23 words
The RF switch circuit according to claim 4 wherein said RF signal decoupling means includes a plurality of RF chokes and a resistor.
Claim 7
Dependent Claim
24 words
The RF switch circuit according to claim 1 wherein said strong RF signal detecting means comprises a detector such as an absolute value detector.
Claim 8
Dependent Claim
23 words
The RF switch circuit according to claim 1 wherein said strong RF signal detecting means comprises a detector such as a peak detector.
Claim 9
Dependent Claim
151 words
A solid state RF transmit receive switch suitable for use in a radio such as a land-mobile transceiver and capable of selectively coupling an antenna alternately to the receiver and transmitter therein, said RF transmit receive switch comprising in combination: a first PIN diode for electrically coupling the receiver to said antenna and controlled by a first biasing voltage; a second PIN diode for electrically coupling the transmitter to said antenna and controlled by a second biasing voltage; and transmit signal detecting means electrically coupled to said second PIN diode for providing a reverse bias voltage electrically coupled back to said first PIN diode, said transmit signal detecting means adaptively tracking the magnitude of the transmitted RF signal at said second PIN diode to supply adequate, variable, reverse bias to said first PIN diode, thereby ensuring that said first PIN diode remains switched off to enhance the power handling capability thereof.
Claim 10
Dependent Claim
151 words
A solid state RF transmit receive switch suitable for use in a radio such as a land-mobile transceiver and capable of selectively coupling an antenna alternately to the receiver and transmitter therein, said RF transmit receive switch comprising in combination: a first PIN diode for electrically coupling the receiver to said antenna and controlled by a first biasing voltage; a second PIN diode for electrically coupling the transmitter to said antenna and controlled by a second biasing voltage; and transmit signal detecting means electrically coupled to said second PIN diode for providing a reverse bias voltage electrically coupled back to said first PIN diode, said transmit signal detecting means adaptively tracking the magnitude of the transmitted RF signal at said second PIN diode to supply adequate, variable, reverse bias to said first PIN diode, thereby ensuring that said first PIN diode remains switched off to enhance the power handling capability thereof.
Claim 11
Dependent Claim
26 words
The solid state RF transmit receive switch according to claim 8, wherein said transmit signal detecting means comprises a detector such as an absolute value detector.
Claim 12
Dependent Claim
26 words
The solid state RF transmit receive antenna switch according to claim 8 wherein said transmit signal detecting means comprises a detector such as a peak detector.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-12 | 1990-07-14 | 1991-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-12 | 1994-07-14 | 1995-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-12 | 1998-07-14 | 1999-01-13 | $7700.00 | Window Closed / Lapsed |