US3638148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lid interaction protected shield enclosed dielectric mounted microstrip
Assignee: Collins Radio Co
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Filing: 1970-06-25
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Granted: 1972-01-25
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Expires: 1990-06-25
Abstract
Abstract A shield enclosed microstrip circuit on a rigid relatively thick thermally and electrically conductive ground plane plate with polyolefin dielectric material approximately 0.026 inches thick having a dielectric constant within approximately the 2.3 to 2.5 range and microstrip circuitry in bonded laminate relation. RF microwave absorbent foamed material is supported within the shield enclosure in spaced generally parallel relation from the microstrip circuitry to simulate free space and eliminate ''''LID'''' effect over the microstrip circuitry.
Inventors
- 👤 Ben R Hallford
- 👤 Carl E Bach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:18
CPC Classifications
H; H01; H01P; H01P3/00; H01P3/02; H01P3/08; H01P3/081; H01P5/00; H01P5/08; H01P5/10; H01P5/107; H01Q; H01Q17/00
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
51 words
The shield enclosed dielectric mounted microstrip circuit of claim 1, including at least one signal path structure extending from the exterior of said electrically conductive shield means to connection with said microstrip circuitry; and with said signal path structure having a coaxial center conductor supported by dielectric from outer conductive means.
Claim 2
Dependent Claim
28 words
The shield enclosed dielectric mounted microstrip circuit of claim 2, wherein said signal path structure is a coaxial line fixture for connection with an external coaxial transmission line.
Claim 3
Dependent Claim
47 words
The shield enclosed dielectric mounted microstrip circuit of claim 2, wherein said signal path structure is a microwave probe with the coaxial center conductor extended into a waveguide external to said electrically conductive shield means with the probe structure a microwave waveguide to microstrip circuit transition device.
Claim 4
Dependent Claim
30 words
The shield enclosed dielectric mounted microstrip circuit of claim 4, wherein a capacity matching disc is mounted on the probe to microstrip circuit interconnect end of said microwave probe structure.
Claim 5
Dependent Claim
20 words
The shield enclosed dielectric mounted microstrip circuit of claim 1, wherein said dielectric material layer is a layer of polyolefin.
Claim 6
Dependent Claim
34 words
The shield enclosed dielectric mounted microstrip circuit of claim 6, wherein signal transmission lines of said microstrip circuitry are relatively narrow relative to the shortest RF signal wavelength transmitted through said signal transmission lines.
Claim 7
Dependent Claim
44 words
The shield enclosed dielectric mounted microstrip circuit of claim 7, wherein said microstrip circuitry transmission lines and dielectric material thickness are Sized for line characteristic impedance to be a design selected value from within the range of from approximately 10 ohms to 150 ohms.
Claim 8
Dependent Claim
25 words
The shield enclosed dielectric mounted microstrip circuit of claim 7, wherein the microstrip circuitry is dimensioned for microwave RF frequencies up to approximately 18 GHz.
Claim 9
Dependent Claim
21 words
The shield enclosed dielectric mounted microstrip circuit of claim 9, wherein said polyolefin dielectric material layer is approximately 0.026 inches thick.
Claim 10
Dependent Claim
26 words
The shield enclosed dielectric mounted microstrip circuit of claim 10, wherein said microstrip circuitry transmission lines are approximately 0.077 inches wide and approximately 0.0014 inches thick.
Claim 11
Dependent Claim
20 words
The shield enclosed dielectric mounted microstrip circuit of claim 11, wherein said microstrip circuitry transmission lines are 50 ohm lines.
Claim 12
Dependent Claim
16 words
The shield enclosed dielectric mounted microstrip circuit of claim 6, wherein said polyolefin is irradiated polyolefin.
Claim 13
Dependent Claim
21 words
The shield enclosed dielectric mounted microstrip circuit of claim 6, wherein additional circuit means is mounted within said shield enclosure means.
Claim 14
Dependent Claim
19 words
The shield enclosed dielectric mounted microstrip circuit of claim 14, wherein a circuit board carries said additional circuit means.
Claim 15
Dependent Claim
41 words
The shield enclosed dielectric mounted microstrip circuit of claim 15, wherein said circuit board includes an IF amplifier circuit; said microstrip circuitry includes a mixer circuit; and a relatively short jumper lead from said microstrip circuitry to said IF amplifier circuit.
Claim 16
Dependent Claim
60 words
The shield enclosed dielectric mounted microstrip circuit of claim 1, wherein said ground plane plate mounts heat generating component means, with said heat generating component means mounted in direct contact with said ground plane plate in an area where said dielectric material layer is removed; and with said ground plane plate a heat sink for said heat generating component means.
Claim 17
Dependent Claim
33 words
The shield enclosed dielectric mounted microstrip circuit of claim 17, wherein said ground plane plate is a sheet of aluminum with at least the rigidity of an aluminum sheet approximately 0.090 inches thick.
Claim 18
Dependent Claim
57 words
The shield enclosed dielectric mounted microstrip circuit of claim 1, wherein said layer of microwave energy absorbent substantially nonreflective material has a graded bulk resistivity presenting a minimum to maximum lossetivity factor as a lossy media from the layer surface closest to the microstrip circuitry to the surface bonded to support means within said electrically conductive shield.
Claim 19
Dependent Claim
32 words
The shield enclosed dielectric mounted microstrip circuit of claim 19, wherein said layer of microwave energy absorbent substantially nonreflective material is spaced at least three-eighths of an inch from said microstrip circuitry.
Claim 20
Dependent Claim
26 words
The shield enclosed dielectric mounted microstrip circuit of claim 20, wherein said layer of microwave energy absorbent substantially nonreflective material is at least one-fourth inch thick.
Claim 21
Dependent Claim
27 words
The shield enclosed dielectric mounted microstrip circuit of claim 21, wherein said layer of microwave energy absorbent substantially nonreflective material is a plurality of layers bonded together.
Claim 22
Dependent Claim
52 words
The shield enclosed dielectric mounted microstrip circuit of claim 18, wherein gold-plated aluminum ground pins are used at ground points of said microstrip circuitry pressed into drilled openings through the dielectric material laminate and ground plane plate; and with a conductive material to microstrip interconnect deposit on the ground pin microstrip ends.
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |