US4491806A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resonant cavity with integrated microphonic suppression means
Assignee: Motorola Solutions Inc
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Filing: 1982-10-06
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Granted: 1985-01-01
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Expires: 2002-10-06
Abstract
Abstract The invention is a microphonics suppression means for a high frequency resonant cavity. The resonant cavity is used in a RF oscillator to generate UHF/VHF frequencies. The resonant cavity comprises an outer wall portion, a center conductor portion, a tuning slug and a plurality of coupling probes. The coupling probes, tuning slug and center conductor are held in a fixed relationship by a microphonics suppression means made of a low dielectric material which fits over and around the center conductor and encapsulates the coupling probes and collars the tuning slug. The microphonics suppression means reduces the effect of microphonics on the output signal of the RF oscillator, thus allowing a clean output signal suitable for high power applications.
Inventors
- 👤 Gary R. Reynolds
- 👤 Thomas R. Gaynor
- 👤 Raul Olivera
- 👤 Ross E. Ruthenberg
- 👤 Jay G. Smith
- 👤 Christopher N. Kurby
- 👤 Terry K. Mansfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:47
CPC Classifications
H; H01; H01P; H01P7/00; H01P7/04
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
78 words
A resonant cavity RF oscillator comprising in combination: a RF oscillator having at least an output, a resonant cavity with a center conductor, coupling means for capacitively coupling said RF oscillator to said center conductor of said resonant cavity, and encapsulating means to encapsulate at least a portion of said coupling means and to secure said coupling means in a fixed spaced relationship to said center conductor thereby avoiding the effects of microphonics at said RF oscillator output.
Claim 2
Dependent Claim
78 words
A resonant cavity RF oscillator comprising in combination: a RF oscillator having at least an output, a resonant cavity with a center conductor, coupling means for capacitively coupling said RF oscillator to said center conductor of said resonant cavity, and encapsulating means to encapsulate at least a portion of said coupling means and to secure said coupling means in a fixed spaced relationship to said center conductor thereby avoiding the effects of microphonics at said RF oscillator output.
Claim 3
Dependent Claim
30 words
A resonant cavity RF oscillator according to claim 1 wherein said encapsulating means includes a collar portion which fits over the top of said center conductor of said resonant cavity.
Claim 4
Dependent Claim
32 words
A resonant cavity RF oscillator according to claim 1 wherein said resonant cavity includes a tuning slug which is received by a central hollow of said center conductor of said resonant cavity.
Claim 5
Dependent Claim
56 words
A resonant cavity RF oscillator according to claim 3 wherein said collar portion of said encapsulating means includes an opening to receive said tuning slug and align said tuning slug within said hollow of said center conductor so that the longitudinal axis of said tuning slug is coaxial with the longitudinal axis of said center conductor.
Claim 6
Dependent Claim
35 words
A resonant cavity RF oscillator according to claim 3 wherein said collar portion of said encapsulating means includes an opening for receiving said tuning slug, said opening approximating an interference fit with said tuning slug.
Claim 7
Dependent Claim
24 words
A resonant cavity RF oscillator according to claim 1 wherein said encapsulating means is formed of an insulating material exhibiting a low dielectric constant.
Claim 8
Dependent Claim
37 words
A resonant cavity RF oscillator according to claim 1 wherein said encapsulating mean comprises two annular ring portions connected by an encapsulation portion which holds at least a portion of said coupling means in a fixed relationship.
Claim 9
Dependent Claim
55 words
A resonant cavity comprising: a outer wall portion, a center conductor, input/output means capacitively coupled to said center conductor, encapsulating means to encapsulate at least a portion of said input/output means and to secure said input/output means in a fixed relationship to said center conductor thereby avoiding the effects of microphonics at the input/output means.
Claim 10
Dependent Claim
55 words
A resonant cavity comprising: a outer wall portion, a center conductor, input/output means capacitively coupled to said center conductor, encapsulating means to encapsulate at least a portion of said input/output means and to secure said input/output means in a fixed relationship to said center conductor thereby avoiding the effects of microphonics at the input/output means.
Claim 11
Dependent Claim
24 words
A resonant cavity according to claim 8 wherein said encapsulating means includes a collar portion which fits over the top of said center conductor.
Claim 12
Dependent Claim
22 words
A resonant cavity according to claim 9 including a tuning slug which is received by a central hollow in said center conductor.
Claim 13
Dependent Claim
54 words
A resonant cavity according to claim 10 wherein said collar portion of said encapsulating means includes an opening to receive said tuning slug and align said tuning slug within said hollow of said center conductor so that the longitudinal axis of said tuning slug is coaxial with the longitudinal axis of said center conductor.
Claim 14
Dependent Claim
33 words
A resonant cavity according to claim 10 wherein said collar portion of said encapsulating means includes an opening for receiving said tuning slug, said opening approximating an interference fit with said tuning slug.
Claim 15
Dependent Claim
22 words
A resonant cavity according to claim 8 wherein said encapsulating means is formed of an insulating material exhibiting a low dielectric constant.
Claim 16
Dependent Claim
35 words
A resonant cavity according to claim 8 wherein said encapsulating means comprises two annular ring portions connected by an encapsulating portion which holds at least a portion of said coupling means in a fixed relationship.
Claim 17
Dependent Claim
18 words
A resonant cavity according to claim 12 wherein said opening is annular with teeth-like projections lining its circumference.
Claim 18
Dependent Claim
49 words
A microphonics suppression means for a resonant cavity having a center conductor, tuning slug and coupling probes, said suppression means comprising: a collar portion for centering said tuning slug within said center conductor, an encapsulating portion for securing said coupling probes in a fixed relationship to said center conductor.
Claim 19
Dependent Claim
49 words
A microphonics suppression means for a resonant cavity having a center conductor, tuning slug and coupling probes, said suppression means comprising: a collar portion for centering said tuning slug within said center conductor, an encapsulating portion for securing said coupling probes in a fixed relationship to said center conductor.
Claim 20
Dependent Claim
19 words
A suppression means according to claim 16 wherein said collar portion includes an opening to receive said tuning slug.
Claim 21
Dependent Claim
21 words
A suppression means according to claim 16 including a annular portion which fits around the outside perimeter of said center conductor.
Claim 22
Dependent Claim
28 words
A suppression means according to claim 17 wherein said opening in said collar portion is lined with teethlike projections which make an interference fit with said tuning slug.
Claim 23
Dependent Claim
21 words
A suppression means according to claim 16 which includes a ribbed portion which serves as walls to restrain said coupling probes.
Claim 24
Dependent Claim
16 words
A suppression means according to claim 19 wherein said teethlike projections are of a pointed shape.
Claim 25
Independent Claim
59 words
A method for suppressing microphonics in a center conductor resonant cavity comprising the steps of: (a) capacitively coupling inputs and outputs probes to said center conductor; (b) capacitively coupling a tuning slug to said center conductor; (c) encapsulating and holding in a fixed relationship at least a portion of said output probes, said center conductor and said tuning slug.
Claim 26
Independent Claim
59 words
A method for suppressing microphonics in a center conductor resonant cavity comprising the steps of: (a) capacitively coupling inputs and outputs probes to said center conductor; (b) capacitively coupling a tuning slug to said center conductor; (c) encapsulating and holding in a fixed relationship at least a portion of said output probes, said center conductor and said tuning slug.
Claim 27
Dependent Claim
50 words
A method for suppressing microphonics in a center conductor resonant cavity according to claim 22 including the step of creating an encapsulating collar around said tuning slug and over said center conductor to enable said tuning slug to be moveable within said center conductor while maintaining the suppression of microphonics.
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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) | 1988-01-01 | 1988-07-02 | 1989-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-01 | 1992-07-02 | 1993-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-01 | 1996-07-02 | 1997-01-01 | $7700.00 | Window Closed / Lapsed |