US3568099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Matched microwave limiter
Assignee: Singer Co
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Filing: 1969-04-21
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Granted: 1971-03-02
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Expires: 1989-04-21
Abstract
Abstract An improved limiter for microwave circuits to remove voltage applied to a load when the voltage amplitude exceeds a predetermined value without reflections in the circuit. A pair of voltage sensitive switches are connected across a circuit with one switch in series with an insert impedance substantially equal to line impedance. The switches are separated by an impedance inverter to effectively apply a very large impedance across the insert impedance to prevent R-F reflection in the limiting mode.
Inventors
- 👤 Gene Chao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:25
CPC Classifications
H; H02; H02H; H02H9/00; H02H9/04; H03; H03G; H03G11/00; H03G11/02; H03G11/025
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
114 words
A matched microwave limiter for a load connected across a transmission line and having substantially the same impedance as the input impedance of the line comprising a first voltagesensitive switch connected across said line immediately ahead of said load for conduction at a predetermined maximum line voltage, and a second voltage-sensitive switch connected in series with an insert impedance across said line one-quarter wavelength ahead of said first switch, said insert impedance substantially equaling said load impedance whereby conduction of said switches inverts the low impedance of said conducting first switch into a high impedance across said insert impedance so that same substantially matches the line input impedance for preventing energy reflection during limiting.
Claim 2
Dependent Claim
114 words
A matched microwave limiter for a load connected across a transmission line and having substantially the same impedance as the input impedance of the line comprising a first voltagesensitive switch connected across said line immediately ahead of said load for conduction at a predetermined maximum line voltage, and a second voltage-sensitive switch connected in series with an insert impedance across said line one-quarter wavelength ahead of said first switch, said insert impedance substantially equaling said load impedance whereby conduction of said switches inverts the low impedance of said conducting first switch into a high impedance across said insert impedance so that same substantially matches the line input impedance for preventing energy reflection during limiting.
Claim 3
Dependent Claim
43 words
The matched microwave limiter of claim 1 further defined by said first and second voltage-sensitive switches being cutoff diodes conducting only upon application of voltage in excess of a predetermined minimum and reverting to nonconduction upon reduction of applied voltage below such minimum.
Claim 4
Dependent Claim
26 words
The limiter of claim 2 further defined by said diodes having a very low impedance in conducting state and a very high impedance in nonconducting state.
Claim 5
Dependent Claim
54 words
The limiter of claim 1 further defined by a second series combination of a voltage sensitive switch and another insert impedance connected across the circuit on the opposite side of said first switch from said first combination and spaced from said first switch one-quarter wavelength at circuit operating frequency for bilateral limiting without reflection.
Claim 6
Dependent Claim
34 words
The limiter of claim 1 further defined by the separation of first switch and second switch and impedance along the circuit being an odd multiple of one-quarter wavelength at operating frequency of the circuit.
Claim 7
Dependent Claim
28 words
The limiter of claim 1 further defined by the separation of first switch and second switch impedance combination being by multiquarter wavelength sections for broadband limiting without reflections.
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |