Patent US4894742A successfully refreshed from Google Patents.
Patent US5504745A successfully refreshed from Google Patents.
US5504745A
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Switching cell transmission device employing dual gate FET's as one-way RF switching element
Assignee: European Space Agency
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Filing: 1994-06-01
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Granted: 1996-04-02
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Expires: 2014-06-01
Abstract
Abstract The present invention relates mainly to distribution and/or processing devices for RF signals, in particular devices of the following types: signal combiner, signal splitter or divider, time multiplexer, time demultiplexer, frequency multiplexer, amplifier, attenuator, variable delay lines, and a vector modulator type circuit for signal shaping. A device of the invention comprises switching cells based on respective dual gate FETs, and a control signal generator that controls switching to enable the desired functions to be established.
Inventors
- 👤 Felix A. Petz
- 👤 Wolfgang Greiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:20
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/687; H03K17/693
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
110 words
A switching cell transmission device comprising: a) a multiplexer switching cell including: n (where n is an integer greater than 1) input lines; an output line; n one-way radiofrequency switching elements connecting the n input lines to the output line; b) a demultiplexer switching cell including: an input line; n output lines; n one-way RF switching elements connecting, on command, the input line to the n output lines; c) a transmission line connecting the output line of the multiplexer to the input line of the demultiplexer; and d) at least one control circuit ensuring synchronous sequential distribution of the switching elements of the multiplexer and of the demultiplexer switching cells.
Claim 2
Dependent Claim
110 words
A switching cell transmission device comprising: a) a multiplexer switching cell including: n (where n is an integer greater than 1) input lines; an output line; n one-way radiofrequency switching elements connecting the n input lines to the output line; b) a demultiplexer switching cell including: an input line; n output lines; n one-way RF switching elements connecting, on command, the input line to the n output lines; c) a transmission line connecting the output line of the multiplexer to the input line of the demultiplexer; and d) at least one control circuit ensuring synchronous sequential distribution of the switching elements of the multiplexer and of the demultiplexer switching cells.
Claim 3
Dependent Claim
21 words
A switching cell transmission device according to claim 1, characterized in that the one-way RF switching elements are dual gate FETs.
Claim 4
Dependent Claim
126 words
A switching cell transmission device comprising: a) a multiplexer switching cell including: n (where n is an integer greater than 1) input lines; an output line; n one-way RF switching elements connecting the n input lines to the output lines; b) n bandpass filters centered on n frequencies, each connected to one of the n input lines of the multiplexer; c) a demultiplexer switching cell including: an input line; n output lines; n one-way RF switching elements connecting on command the input line to the n output lines; d) a transmission line connecting the output line of the multiplexer to the input line of the demultiplexer; and e) at least one control circuit ensuring synchronous, sequential, or simultaneous switching of the switching elements of the demultiplexer.
Claim 5
Dependent Claim
126 words
A switching cell transmission device comprising: a) a multiplexer switching cell including: n (where n is an integer greater than 1) input lines; an output line; n one-way RF switching elements connecting the n input lines to the output lines; b) n bandpass filters centered on n frequencies, each connected to one of the n input lines of the multiplexer; c) a demultiplexer switching cell including: an input line; n output lines; n one-way RF switching elements connecting on command the input line to the n output lines; d) a transmission line connecting the output line of the multiplexer to the input line of the demultiplexer; and e) at least one control circuit ensuring synchronous, sequential, or simultaneous switching of the switching elements of the demultiplexer.
Claim 6
Dependent Claim
21 words
A switching cell transmission device according to claim 3, characterized in that the one-way RF switching elements are dual gate FETs.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-04-02 | 1999-10-02 | 2000-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-02 | 2003-10-02 | 2004-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-02 | 2007-10-02 | 2008-04-02 | $7700.00 | Window Closed / Lapsed |