US4611186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Noncontacting MIC ground plane coupling using a broadband virtual short circuit gap
Assignee: General Dynamics Mission Systems Inc
•
Filing: 1985-07-29
•
Granted: 1986-09-09
•
Expires: 2005-07-29
Abstract
Abstract Electrical coupling to the ground plane of an MIC is accomplished by forming a gap adjacent an edge of the ground plane and causing a virtual short to appear across the gap. A two part, one-half wavelength transmission line transformer is used to provide the virtual short. The transformer is defined by the conductive members surrounding the MIC and is open at the end corresponding to the gap and shorted at the other end. The impedances of the two parts of the transformer are chosen to maximize the bandwidth of the virtual short.
Inventors
- 👤 Bernhard A. Ziegner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:26
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/04; H01P5/00; H01P5/02; H01P5/08; H01P5/085; Y; Y10; Y10S; Y10S439/00; Y10S439/916
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
149 words
An apparatus for electrically coupling to a ground plane of an MIC comprising: a first conductive member, said MIC being mounted thereon with said ground plane in contact therewith, said ground plane being substantially coincident with an edge of said first member in a coupling region, said first conductive member having a first cavity portion; a second conductive member having a second cavity portion, said second conductive member being abutted against said first conductive member to provide that said first and second cavity portions combine to form; a gap between said first and second conductive members at said coupling region; a first waveguide section having a first end coincident with said gap; and a second waveguide section, said first and second wave guide sections combining to cause a broadband virtual short across said gap, whereby said ground plane is electrically coupled to said second conductive member across said gap.
Claim 2
Independent Claim
149 words
An apparatus for electrically coupling to a ground plane of an MIC comprising: a first conductive member, said MIC being mounted thereon with said ground plane in contact therewith, said ground plane being substantially coincident with an edge of said first member in a coupling region, said first conductive member having a first cavity portion; a second conductive member having a second cavity portion, said second conductive member being abutted against said first conductive member to provide that said first and second cavity portions combine to form; a gap between said first and second conductive members at said coupling region; a first waveguide section having a first end coincident with said gap; and a second waveguide section, said first and second wave guide sections combining to cause a broadband virtual short across said gap, whereby said ground plane is electrically coupled to said second conductive member across said gap.
Claim 3
Dependent Claim
43 words
An apparatus according to claim 1 wherein: said first and second conductive members form base and wall portions, respectively, of an MIC enclosure and said ground plane is electrically coupled to an outer conductor of a coaxial connector mounted to said wall portion.
Claim 4
Dependent Claim
46 words
An apparatus according to claim 1 wherein: said first and second conductive members form a base of said MIC and a base of an adjacent MIC, respectively, said ground plane said MIC being electrically coupled across said gap to a ground plane of said adjacent MIC.
Claim 5
Dependent Claim
67 words
An apparatus according to claim 1 wherein: said first waveguide section has a length of approximately one quarter wavelength at a first frequency and has a first impedance; and said second waveguide section has a length of approximately one quarter wavelength at said first frequency and has second impedance, said first and second impedances being chosen to maximize a bandwidth of said virtual short across said gap.
References Cited (Backward Citations)
DE197805C
Cited
US2451876A
Cited
US3553610A
Cited
US3747044A
Cited
US3852690A
Cited
US3870974A
Cited
US4100516A
Cited
SU708442A1
Cited
US4255730A
Cited
JPS56103501A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-08 | 1990-03-10 | 1990-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-08 | 1994-03-10 | 1994-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-08 | 1998-03-10 | 1998-09-09 | $7700.00 | Window Closed / Lapsed |