US3737784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuits with broad band flat frequency responses using directional filters
Assignee: International Telecommunications Satellite Organization
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Filing: 1971-07-21
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Granted: 1973-06-05
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Expires: 1991-07-21
Abstract
Abstract Disclosed heren is a technique for producing broad band flat frequency responses using active elements by eliminating mismatch caused energy reflections. The technique provides for the upling of directional filters to selected ports of n active element. Each of the directional filters includes a resistive termination matched to the source impedance of the port to which it is coupled over a broad band of frequencies outside of the filter passband.
Inventors
- 👤 I Dostis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:30
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H03; H03D; H03D9/00; H03D9/06; H03D9/0608; H03D9/0633; H03F; H03F3/00; H03F3/04; H03F3/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
208 words
In combination, a three port mixer element, first and second signal generating means, a first directional filter coupled to a first port of said mixer element and said first signal generating means, said first directional filter including a resistive termination matched to the source impedance of said first port at frequencies outside of said first filter passband and a resistive termination matched to the source impedance of said first signal generating means at frequencies outside of said first filter passband, a second directional filter coupled to a second port of said mixer element and said second signal generating means, said second directional filter including a resistive termination matched to the source impedance of said second port at frequencies outside the passband of said second directional filter and a resistive termination matched to the source impedance of said second signal generating means at frequencies outside the passband of said second directional filter, a load impedance and a third directional filter coupled to a third port of said mixer element and said load impedance, said third directional filter including a resistive termination matched to the source impedance of said third port at frequencies outside of the passband of said third directional filter and resistive termination matched to the load impedance.
Claim 2
Dependent Claim
208 words
In combination, a three port mixer element, first and second signal generating means, a first directional filter coupled to a first port of said mixer element and said first signal generating means, said first directional filter including a resistive termination matched to the source impedance of said first port at frequencies outside of said first filter passband and a resistive termination matched to the source impedance of said first signal generating means at frequencies outside of said first filter passband, a second directional filter coupled to a second port of said mixer element and said second signal generating means, said second directional filter including a resistive termination matched to the source impedance of said second port at frequencies outside the passband of said second directional filter and a resistive termination matched to the source impedance of said second signal generating means at frequencies outside the passband of said second directional filter, a load impedance and a third directional filter coupled to a third port of said mixer element and said load impedance, said third directional filter including a resistive termination matched to the source impedance of said third port at frequencies outside of the passband of said third directional filter and resistive termination matched to the load impedance.
References Cited (Backward Citations)
US3208003A
Cited
US3293447A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |