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US3725829A Expired / Lapsed US ⏱️ 0.0 years remaining

Electrical connector

Assignee: Northrop Grumman Guidance and Electronics Co Inc
•
Filing: 1971-07-14
•
Granted: 1973-04-03
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Expires: 1991-07-14
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Abstract

Abstract An electrical connector for transferring electromagnetic energy between a coaxial cable and a microstrip transmission system, each having a characteristic impedance of 50 ohms, with a minimal power loss due to a reflective discontinuity during the transfer. The electrical connector includes a central conductor and an outer conductor enclosing the central conductor, and has first, second, and transition sections each of which is designed to have a characteristics impedance of 50 ohms. The first and second sections are designed like sections of a coaxial cable to have a characteristic impedance of 50 ohms by the proper selection of the ratio of the diameters of the central and outer conductors. The central conductor of the first section has a small diameter, and the diameter of the outer conductor is a selected multiple of the small diameter to yield a characteristic impedance of 50 ohms. The second section has a large diameter central conductor, and the diameter of the outer conductor is the same selected multiple of the large diameter to yield a characteristic impedance of 50 ohms. The central conductor has an abrupt shoulder like transition between the small ad large diameters of the first and second sections. Similarly, the outer conductor has an abrupt shoulder like transition between the small and large diameters of the first and second sections. The transition section of the connector joins the first and second sections, and is constructed to have a short length of the small diameter of the central conductor enclosed within a short length of the large diameter of the outer conductor. The abrupt shoulder like transitions of the central and outer conductors define a large surface area between the central and outer conductors over a short conductive path. This large surface area introduces a significant capacitive reactance which is compensated for by positioning the short length of the small diameter central conductor in the large diameter outer conductor. This relative positioning introduces a significant inductive reactance into the transition section to compensate for the significant capacitive reactance introduced by the large surface area, and results in a characteristic impedance of 50 ohms in the transition section.

Inventors

  • 👤 D Brown

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 05:59
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/08; H01P5/085

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 301 words
Apparatus for transferring electromagnetic energy between a coaxial cable and a strip transmission line with a relatively small power loss due to a reflective discontinuity comprising: a. said strip transmission line having first and second conductive elements; b. said coaxial cable having a central conductor and an outer conductor; c. a connector having a first conductor for connecting said central conductor of the coaxial cable with said first conductive element of the strip transmission line, said first conductor having a relatively thin first section, and a relatively thick second section adjoining said first section with the joinder of said first and second sections of said first conductor defining a large surface area over a short conductive path which introduces a capacitive reactance; d. said connector having a second conductor for connecting said outer conductor of the coaxial cable with said second conductive element of the strip transmission line, said second conductor having a first section with a relatively small aperture and a second section, adjoining said first section, with a relatively large aperture with the joinder of said first and second sections of said second conductor defining a large surface area over a short conductive path which introduces a capacitive reactance; and e. means for supporting said second section of said first conductor within said second section of said second conductor, and for supporting said first section of the first conductor within said first section of said second conductor and partially within said second section of said second conductor to introduce an inductive reactance to compensate for said capacitive reactances, whereby the relatively thin first section of said first conductor being partially positioned within the relatively large aperture of said second conductor results in a desired impedance to electromagnetic energy being transferred between said strip transmission line and said coaxial cable.
Claim 2
Dependent Claim 301 words
Apparatus for transferring electromagnetic energy between a coaxial cable and a strip transmission line with a relatively small power loss due to a reflective discontinuity comprising: a. said strip transmission line having first and second conductive elements; b. said coaxial cable having a central conductor and an outer conductor; c. a connector having a first conductor for connecting said central conductor of the coaxial cable with said first conductive element of the strip transmission line, said first conductor having a relatively thin first section, and a relatively thick second section adjoining said first section with the joinder of said first and second sections of said first conductor defining a large surface area over a short conductive path which introduces a capacitive reactance; d. said connector having a second conductor for connecting said outer conductor of the coaxial cable with said second conductive element of the strip transmission line, said second conductor having a first section with a relatively small aperture and a second section, adjoining said first section, with a relatively large aperture with the joinder of said first and second sections of said second conductor defining a large surface area over a short conductive path which introduces a capacitive reactance; and e. means for supporting said second section of said first conductor within said second section of said second conductor, and for supporting said first section of the first conductor within said first section of said second conductor and partially within said second section of said second conductor to introduce an inductive reactance to compensate for said capacitive reactances, whereby the relatively thin first section of said first conductor being partially positioned within the relatively large aperture of said second conductor results in a desired impedance to electromagnetic energy being transferred between said strip transmission line and said coaxial cable.
Claim 3
Dependent Claim 45 words
Apparatus as set forth in claim 1 wherein said first conductor has an abrupt, shoulder like transition between said relatively thin first section and said relatively thick second section, and said second conductor has an abrupt, shoulder like transition between said small and large apertures.
Claim 4
Dependent Claim 35 words
Apparatus as set forth in claim 1 wherein said first and second sections of said first conductor each have cylindrical shapes and said small and large apertures of said second conductor each have cylindrical shapes.
Claim 5
Dependent Claim 30 words
Apparatus as set forth in claim 1 wherein only a small portion of said first section of said first conductor is located within said second section of said second conductor.
Claim 6
Dependent Claim 39 words
Apparatus as set forth in claim 1 wherein the characteristic impedance of said coaxial cable is 50 ohms, the characteristic impedance of said strip transmission line is 50 ohms, and the characteristic impedance of said connector is 50 ohms.
Claim 7
Dependent Claim 39 words
Apparatus as set forth in claim 1 wherein said relatively thin first section of said first conductor includes a cantilevered section protruding from the end of said first section for making an electrical contact with the strip transmission line.
Claim 8
Dependent Claim 23 words
Apparatus as set forth in claim 1 wherein said strip transmission line is a microstrip slab, and is supported within a housing means.
Claim 9
Dependent Claim 78 words
Apparatus as set forth in claim 1 wherein: a. said first and second sections of said first conductor each have cylindrical shapes, and said small and large apertures of said second conductor each have cylindrical shapes; b. said first conductor has an abrupt, shoulder like transition between said relatively thin first cylindrical section and said relatively thick second cylindrical section; and c. said second conductor has an abrupt shoulder like transition between said small and large cylindrical apertures.
Claim 10
Dependent Claim 39 words
Apparatus as set forth in claim 8 wherein the characteristic impedance of said coaxial cable is 50 ohms, the characteristic impedance of said strip transmission line is 50 ohms, and the characteristic impedance of said connector is 50 ohms.
Claim 11
Dependent Claim 23 words
Apparatus as set forth in claim 9 wherein said strip transmission line is a microstrip slab, and is supported within a housing means.

References Cited (Backward Citations)

US2938175A Cited
US3170128A Cited
US3201721A Cited
US3325752A Cited
US3553607A Cited
US3579149A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-04-02 1976-10-02 1977-04-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-04-02 1980-10-02 1981-04-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-04-02 1984-10-02 1985-04-03 $7700.00 Window Closed / Lapsed

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