US3624563A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coil and fixed tap input coupling for variably end-loaded coaxial filter, giving linear q with tuning change, suitable for multicoupler applications
Assignee: Westinghouse Electric Corp
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Filing: 1969-07-03
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Granted: 1971-11-30
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Expires: 1989-07-03
Abstract
Abstract An input coupling for a multicoupler filter wherein the inner conductor of the input cavity is connected to a generator through a choke which is connected at one end to the generator and at the opposite end by a tap to the inner conductor of the cavity. The inductance magnitude of the choke and the position of the tap on the inner conductor are selected to provide a predetermined loaded Q of the cavity at one end of the frequency range of interest and to provide another predetermined loaded Q of the cavity at the opposite end of the frequency range of interest. The loaded Q of the cavity has been found to vary linearly over the frequency range of interest when the inductance magnitude of the choke and the position of the tap are determined in the aforementioned manner.
Inventors
- 👤 Henry E Burley
- 👤 William H Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:25
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/46; H03H2/00; H03H2/005; H03H2/006; H03H7/01; H03H7/0123
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
In a resonant cavity, the combination comprising; an inner conductor, end loaded by a variable capacitor to obtain resonance over a wide range of frequencies; and input means for connecting a generator to said cavity for supplying an input signal; said input means including a coil and a tap connecting said coil to said inner conductor to complete a loop coupling to the cavity from the generator, said coil being of an inductive magnitude and said tap position on said conductor being selected to provide a relationship between the loaded Q of the cavity and the frequencies to which the cavity is to be tuned by the end-loading variable tuning capacitor which is substantially linear.
Claim 2
Dependent Claim
115 words
In a resonant cavity, the combination comprising; an inner conductor, end loaded by a variable capacitor to obtain resonance over a wide range of frequencies; and input means for connecting a generator to said cavity for supplying an input signal; said input means including a coil and a tap connecting said coil to said inner conductor to complete a loop coupling to the cavity from the generator, said coil being of an inductive magnitude and said tap position on said conductor being selected to provide a relationship between the loaded Q of the cavity and the frequencies to which the cavity is to be tuned by the end-loading variable tuning capacitor which is substantially linear.
Claim 3
Dependent Claim
22 words
The combination of claim 1 wherein said coil is disposed on an axis which lies radially with respect to said inner conductor.
Claim 4
Dependent Claim
13 words
The apparatus of claim 1 wherein said coil is located within said cavity.
Claim 5
Dependent Claim
13 words
The combination of claim 4 wherein the inductance of said coil is variable.
Claim 6
Dependent Claim
38 words
The combination of claim 4 wherein said variable coil includes a former on which said coil is wound and a tuning slug, the position of which is adjustable to vary the magnitude of the inductance of said coil.
Claim 7
Dependent Claim
148 words
A channel filter comprising in combination; a pluralIty of cavities each consisting of an inner conductor of shortened length transmission line variably capacitively loaded at one end to obtain a wide range of frequencies; output means connected to the last cavity; means for interconnecting said plurality of cavities; input means for the first cavity including a choke and a tap for connecting said choke to said inner conductor; means for connecting said choke to a generator external to said cavity; the magnitude of the inductance of said choke and the position of the tap on said inner conductor being selected to provide a first predetermined loaded Q of the first cavity at a first frequency and a second predetermined loaded Q of the cavity at a second frequency, whereby the loaded Q of the cavity varies substantially linearly in the frequency range between said first and second frequency.
Claim 8
Dependent Claim
148 words
A channel filter comprising in combination; a pluralIty of cavities each consisting of an inner conductor of shortened length transmission line variably capacitively loaded at one end to obtain a wide range of frequencies; output means connected to the last cavity; means for interconnecting said plurality of cavities; input means for the first cavity including a choke and a tap for connecting said choke to said inner conductor; means for connecting said choke to a generator external to said cavity; the magnitude of the inductance of said choke and the position of the tap on said inner conductor being selected to provide a first predetermined loaded Q of the first cavity at a first frequency and a second predetermined loaded Q of the cavity at a second frequency, whereby the loaded Q of the cavity varies substantially linearly in the frequency range between said first and second frequency.
Claim 9
Dependent Claim
21 words
The combination of claim 6 wherein the first and second frequencies are at opposite extremes of the frequency range of interest.
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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |