US4270106A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broadband mode suppressor for microwave integrated circuits
Assignee: United States Department of the Air Force
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Filing: 1979-11-07
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Granted: 1981-05-26
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Expires: 1999-11-07
Abstract
Abstract Microwave integrated circuits are enclosed in metal boxes. As more functions are added to circuits RF moding increases. One method of minimizing RF moding is to place a post in the box. This invention broadens the band of frequencies controlled by the post method by attaching a lossy RF absorbing pellet to the end of the mode suppression post.
Inventors
- 👤 James D. Woermbke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:25
CPC Classifications
H; H10; H10W; H10W42/00; H10W42/20; H01; H01P; H01P1/00; H01P1/16; H01P1/162
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
102 words
A broadband mode suppressor for microwave integrated circuits comprising: a housing having first and second walls, a top and bottom; a microwave integrated circuit located on the bottom of the housing, said circuit including chip components forming circuit discontinuities and causing undesired RF modes; a metal post mounted on the bottom of the housing and extending in the direction of the top of the housing for suppressing an undesired fundamental radiation mode; a lossy RF absorbing pellet positioned between the said post and top of the housing for suppressing RF modes at higher harmonic frequencies and lower frequencies than the fundamental frequency.
Claim 2
Dependent Claim
102 words
A broadband mode suppressor for microwave integrated circuits comprising: a housing having first and second walls, a top and bottom; a microwave integrated circuit located on the bottom of the housing, said circuit including chip components forming circuit discontinuities and causing undesired RF modes; a metal post mounted on the bottom of the housing and extending in the direction of the top of the housing for suppressing an undesired fundamental radiation mode; a lossy RF absorbing pellet positioned between the said post and top of the housing for suppressing RF modes at higher harmonic frequencies and lower frequencies than the fundamental frequency.
Claim 3
Dependent Claim
25 words
A broadband mode suppressor for microwave integrated circuits according to claim 1 wherein the RF absorbing pellet is formed from an iron loaded rubber material.
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) | 1984-05-25 | 1984-11-24 | 1985-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-25 | 1988-11-24 | 1989-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-25 | 1992-11-24 | 1993-05-26 | $7700.00 | Window Closed / Lapsed |