US4365215A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High power coaxial power divider
Assignee: Lockheed Martin Corp
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Filing: 1981-01-21
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Granted: 1982-12-21
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Expires: 2001-01-21
Abstract
Abstract The power handling capacity of a matched coaxial transmission line power divider is increased with a minimum increase in losses by mounting the isolation resistor(s) within the dielectric volume of the coaxial transmission line and on an electrically-insulating resistor contact portion of a thermally-conducting heat sink. A low dielectric constant region is located between the resistor contact portion of the heat sink and the directly adjacent portion of the outer conductor of the coaxial transmission line.
Inventors
- 👤 Norman R. Landry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:43
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/12; H01P5/16
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
194 words
A coaxial transmission line coupling structure for connecting a common port to n branch ports where n is an integer greater than 1, said structure designed for operation over a predetermined frequency band, said structure comprising: an inner conductor system including a common leg and n branch legs extending from a common junction with said common leg; an n terminal resistance element for dissipating odd mode power and for isolating said n branch ports from each other, each of said n terminals connected to an associated branch leg at a distance from said common junction of approximately one quarter wavelength at a frequency in said band; an outer conductor enclosing said inner conductor system; a thermally conducting dielectric heat sink coupled between said resistance element and said outer conductor for conducting heat away from said resistance element; and said outer conductor and said heat sink being configured to form a region of a lower dielectric constant than said heat sink between said resistance element and said outer conductor to provide a lower capacitance between said resistance element and said outer conductor than would be provided in the absence of said lower dielectric constant region.
Claim 2
Dependent Claim
194 words
A coaxial transmission line coupling structure for connecting a common port to n branch ports where n is an integer greater than 1, said structure designed for operation over a predetermined frequency band, said structure comprising: an inner conductor system including a common leg and n branch legs extending from a common junction with said common leg; an n terminal resistance element for dissipating odd mode power and for isolating said n branch ports from each other, each of said n terminals connected to an associated branch leg at a distance from said common junction of approximately one quarter wavelength at a frequency in said band; an outer conductor enclosing said inner conductor system; a thermally conducting dielectric heat sink coupled between said resistance element and said outer conductor for conducting heat away from said resistance element; and said outer conductor and said heat sink being configured to form a region of a lower dielectric constant than said heat sink between said resistance element and said outer conductor to provide a lower capacitance between said resistance element and said outer conductor than would be provided in the absence of said lower dielectric constant region.
Claim 3
Dependent Claim
29 words
The coupling structure recited in claim 1 wherein said heat sink includes a standoff portion laterally displaced from said resistance element for forming said region of lower dielectric constant.
Claim 4
Dependent Claim
41 words
The coupling structure recited in claim 1 wherein a first portion of said heat sink directly contacts said outer conductor and a second portion of said heat sink is spaced from said outer conductor by said region of lower dielectric constant.
Claim 5
Dependent Claim
198 words
A coaxial transmission line coupling structure for connecting a common port to n branch ports where n is an integer greater than 1, said structure designed for operation over a predetermined frequency band, said structure comprising: an inner conductor system including a common leg and n branch legs extending from a common junction with said common leg; an n terminal resistance element for dissipating odd mode power and for isolating said n branch ports from each other, each of said n terminals connected to an associated branch leg at a distance from said common junction of approximately one quarter wavelength at a frequency in said band; an outer conductor enclosing said inner conductor system; a thermally conducting dielectric heat sink coupled between said resistance element and said outer conductor for conducting heat away from said resistance element; and at least one of said heat sink and said outer conductor having an alcove therein, said alcove having a lower dielectric constant than said heat sink, to form a low dielectric constant region between said resistance element and said outer conductor to provide a low capacitance therebetween while providing effective heat transfer from said resistance element to said outer conductor.
Claim 6
Dependent Claim
198 words
A coaxial transmission line coupling structure for connecting a common port to n branch ports where n is an integer greater than 1, said structure designed for operation over a predetermined frequency band, said structure comprising: an inner conductor system including a common leg and n branch legs extending from a common junction with said common leg; an n terminal resistance element for dissipating odd mode power and for isolating said n branch ports from each other, each of said n terminals connected to an associated branch leg at a distance from said common junction of approximately one quarter wavelength at a frequency in said band; an outer conductor enclosing said inner conductor system; a thermally conducting dielectric heat sink coupled between said resistance element and said outer conductor for conducting heat away from said resistance element; and at least one of said heat sink and said outer conductor having an alcove therein, said alcove having a lower dielectric constant than said heat sink, to form a low dielectric constant region between said resistance element and said outer conductor to provide a low capacitance therebetween while providing effective heat transfer from said resistance element to said outer conductor.
Claim 7
Dependent Claim
26 words
The coupling structure recited in claim 4 wherein said outer conductor includes an alcove disposed adjacent said resistance element to form said low dielectric constant region.
Claim 8
Dependent Claim
28 words
The coupling structure recited in claim 5 wherein said heat sink includes a standoff portion laterally displaced from said resistance element to form said low dielectric constant region.
Claim 9
Dependent Claim
19 words
The coupling structure recited in claim 6 wherein said standoff portion extends into said alcove in said outer conductor.
Claim 10
Dependent Claim
15 words
The coupling structure recited in claim 6 wherein said standoff portion is electrically insulating material.
Claim 11
Dependent Claim
24 words
The coupling structure recited in claim 4 or 5 wherein said heat sink includes an alcove therein to form said low dielectric constant region.
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) | 1985-12-20 | 1986-06-21 | 1986-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-20 | 1990-06-21 | 1990-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-20 | 1994-06-21 | 1994-12-21 | $7700.00 | Window Closed / Lapsed |