Choke coupled coaxial connector

• US 6,407,722 B1
• Filed: 03/09/2001
• Issued: 06/18/2002
• Est. Priority Date: 03/09/2001
• Status: Expired due to Fees

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Bogner, Bruce Fredric, Lier, Erik
• Primary Examiner(s): LE, HOANGANH T
• Application Number:
  US09/803,273
• Time in Patent Office: 466 Days
• Field of Search: H01/Q.150, 343/906, 343/905, 343/790, 343/791, 343/792, 174/138.A, 174/154, 439/916
• US Class Current: 343/906
• CPC Class Codes: H01Q 1/50 Structural association of antennas with earthing switches, lead-in devices or lightning protectors
• CPC Class Codes: H01R 2103/00 Two poles
• CPC Class Codes: H01R 24/44 comprising impedance matching means
• CPC Class Codes: Y10S 439/916 Antenna

Abstract

A choke coupled coaxial connector includes a hybrid transmission line center conductor including an open-circuited transmission line having one-quarter electrical wavelength, which presents an effective short-circuit at a gap in the center conductor structure. The choke coupled connector also includes an open-circuited hybrid transmission line outer conductor also one quarter-wavelength long, which presents an effective short-circuit in a gap in the outer conductor structure. According to an aspect of the invention, certain interior surfaces of the connector are coated with dielectric to prevent galvanic contact and for reduced mating forces. According to another aspect of the invention, the male and female portions of the choke coupled coaxial connector are prevented from rotating. In a particularly advantageous embodiment, an array of choke coupled coaxial connectors.

Claims

1. A coaxial choke connector for use with a first transmission line having a characteristic impedance which, if the first transmission line were a coaxial transmission line, would be defined at least in part by an exterior first diameter of an inner conductor and an interior second diameter of an outer conductor, said coaxial choke connector comprising:

a male portion including an electrically conductive center choke conductor defining a proximal end and a distal end, and an electrically conductive outer choke conductor also defining a proximal end and a distal end, said proximal end of said center choke conductor being coupled to a first conductor of said first transmission line, and said proximal end of said outer choke conductor being coupled to a second conductor of said first transmission line, said center choke conductor of said male portion of said coaxial choke connector having a first length, a circular cross-section centered on a longitudinal axis, and a third diameter less than said first diameter, and said outer choke conductor having an inner fourth diameter which defines a circular cross-section centered on said axis, said fourth inner diameter being larger than said second diameter;

a female portion including an electrically conductive center choke conductor and an electrically conductive outer choke conductor, said inner choke conductor of said female portion of said coaxial choke connector defining a closed-end axial bore with respect to said longitudinal axis, said axial bore having a sixth diameter larger than a fifth diameter and a second length, said center choke conductor of said female portion having an outer diameter equal to said first diameter, said outer choke conductor of said female portion having an inner diameter equal to said second diameter;

a first layer of solid dielectric material lying on one of (a) the outer surface of said center choke conductor of said male portion so that said center choke conductor with said layer of solid dielectric thereon has said fifth diameter smaller than said first diameter and (b) the inner surface of said closed-end axial bore of said center choke conductor of said female portion; and

a second layer of solid dielectric material lying on one of (a) an outer surface of said outer choke conductor of said female portion, so that the overall outer diameter of said outer choke conductor of said female portion together with said solid dielectric material has a seventh diameter, smaller than said fourth diameter and (b) an inner surface of said outer choke conductor of said male portion.

2. A connector according to claim 1, further comprising stop means associated with said male and female portions of said coaxial choke connector for allowing said male and female portions to mate without allowing galvanic contact between (a) said distal end of said center choke conductor of said male portion and said closed end of said axial bore of said center choke conductor of said female portion and (b) said outer choke conductors of said male and female portions of said coaxial choke connector.

3. A connector according to claim 1, further comprising holding means coupled to said male and female portions of said connector, for preventing significant relative rotation therebetween.

4. A connector according to claim 1, further comprising a narrowing taper of said distal end of said center choke conductor of said male portion, to thereby promote self-centering of said coaxial choke connector during mating.

5. A connector according to claim 1, further comprising a narrowing taper of said distal end of said outer choke conductor of said male portion, to thereby promote self-centering of said coaxial choke connector during mating.

6. A connector according to claim 1, wherein said distal end of said center choke conductor said male portion of said coaxial choke connector projects distally beyond the plane of said distal end of said outer choke conductor.

7. An array of coaxial choke connectors, each of said coaxial choke connectors being for use with a first transmission line having a characteristic impedance which, if associated with a coaxial transmission line, would be defined at least in part by an exterior first diameter of an inner conductor and an interior second diameter of an outer conductor, each of said coaxial choke connectors comprising:

a male portion including an electrically conductive center choke conductor defining a proximal end and a distal end, and an electrically conductive outer choke conductor also defining a proximal end and a distal end, said proximal end of said center choke conductor being coupled to a first conductor of said first transmission line, and said proximal end of said outer choke conductor being coupled to a second conductor of said first transmission line, said center choke conductor of said male portion of said coaxial choke connector having a first length, a circular cross-section centered on a longitudinal axis, and a third diameter less than said first diameter, and said outer choke conductor having an inner fourth diameter which defines a circular cross-section centered on said axis, said fourth inner diameter being larger than said second diameter, said center choke conductor having a layer of solid dielectric on the outer surface thereof, so that said center choke conductor with said layer of solid dielectric thereon has a fifth diameter smaller than said first diameter;

a female portion including an electrically conductive center choke conductor and an electrically conductive outer choke conductor, said inner choke conductor of said female portion of said coaxial choke connector defining a closed-end axial bore with respect to said longitudinal axis, said axial bore having a sixth diameter larger than said fifth diameter and a second length, said center choke conductor of said female portion having an outer diameter equal to said first diameter, said outer choke conductor of said female portion having an inner diameter equal to said second diameter, and an outer diameter coated with a solid dielectric material, so that the overall outer diameter of said outer choke conductor of said female portion together with said solid dielectric material has a seventh diameter, smaller than said fourth diameter;

said array further comprising first mechanical support means coupled to said male portions of said array of coaxial choke connectors for holding said male portions in a predetermined array spacing and orientation, second mechanical support means coupled to said female portions of said array of coaxial choke connectors for holding said female portions in said predetermined array spacing and an orientation conducive to mating with said male portions.

8. An array according to claim 7, further comprising third mechanical support means coupled to said first and second mechanical support means, for holding said first and second mechanical support means in a position in which said male and female portions of said array of coaxial choke connectors is mated.

9. A coaxial choke connector for use with a coaxial transmission line having a characteristic impedance defined at least in part by an exterior first diameter of an inner conductor and an interior second diameter of an outer conductor, said connector comprising:

a male portion including an electrically conductive center choke conductor defining a proximal end and a distal end, and an electrically conductive outer choke conductor also defining a proximal end and a distal end, said proximal end of said center choke conductor being coupled to said inner conductor of said coaxial transmission line, and said proximal end of said outer choke conductor being coupled to said outer conductor of said coaxial transmission line, said center choke conductor of said male portion of said coaxial choke connector having a first length, a circular cross-section centered on a longitudinal axis, and a third diameter less than said first diameter, and said outer choke conductor having an inner fourth diameter which defines a circular cross-section centered on said axis, said fourth inner diameter being larger than said second diameter, said center choke conductor having a layer of solid dielectric on the outer surface thereof, so that said center choke conductor with said layer of solid dielectric thereon has a fifth diameter smaller than said first diameter;

a female portion including an electrically conductive center choke conductor and an electrically conductive outer choke conductor, said inner choke conductor of said female portion of said coaxial choke connector defining a closed-end axial bore with respect to said longitudinal axis, said axial bore having a sixth diameter larger than said fifth diameter and a second length, said center choke conductor of said female portion having an outer diameter equal to said first diameter, said outer choke conductor of said female portion having an inner diameter equal to said second diameter, and an outer diameter coated with a solid dielectric material, so that the overall outer diameter of said outer choke conductor of said female portion together with said solid dielectric material has a seventh diameter, smaller than said fourth diameter.

10. A coaxial choke connector for use with a first transmission line having a characteristic impedance which, if the first transmission line were a coaxial transmission line, would be defined at least in part by an exterior first diameter of an inner conductor and an interior second diameter of an outer conductor, said coaxial choke connector comprising:

a male portion including an electrically conductive center choke conductor defining a proximal end and a distal end, and an electrically conductive outer choke conductor also defining a proximal end and a distal end, said proximal end of said center choke conductor being coupled to a first conductor of said first transmission line, and said proximal end of said outer choke conductor being coupled to a second conductor of said first transmission line, said center choke conductor of said male portion of said coaxial choke connector having a first length, an ovoid cross-section centered on a longitudinal axis, and a third transverse dimension less than said first diameter, and said outer choke conductor having an inner fourth dimension which defines an ovoid cross-section centered on said axis, said fourth inner dimension being larger than said second diameter;

a female portion including an electrically conductive center choke conductor and an electrically conductive outer choke conductor, said inner choke conductor of said female portion of said coaxial choke connector defining a closed-end axial aperture with respect to said longitudinal axis, said axial aperture having a transverse sixth dimension larger than a transverse fifth dimension and a second length, said center choke conductor of said female portion having a transverse outer dimension equal to said first diameter, said outer choke conductor of said female portion having a transverse inner dimension equal to said second diameter;

a first layer of solid dielectric material lying on one of (a) the outer surface of said center choke conductor of said male portion so that said center choke conductor with said layer of solid dielectric thereon has said transverse fifth dimension smaller than said first diameter and (b) the inner surface of said closed-end axial aperture of said center choke conductor of said female portion; and

a second layer of solid dielectric material lying on one of (a) an outer surface of said outer choke conductor of said female portion, so that the overall outer dimension of said outer choke conductor of said female portion together with said solid dielectric material has a seventh dimension, smaller than said fourth dimension and (b) an inner surface of said outer choke conductor of said male portion.

11. A coaxial choke connector for use with a first transmission line having a characteristic impedance which, if the first transmission line were a coaxial transmission line, would be defined at least in part by an exterior first diameter of an inner conductor and an interior second diameter of an outer conductor, said coaxial choke connector comprising:

a male portion including an electrically conductive center choke conductor defining a proximal end and a distal end, and an electrically conductive outer choke conductor also defining a proximal end and a distal end, said proximal end of said center choke conductor being coupled to a first conductor of said first transmission line, and said proximal end of said outer choke conductor being coupled to a second conductor of said first transmission line, said center choke conductor of said male portion of said coaxial choke connector having a first length, a rectangular cross-section centered on a longitudinal axis, and a third dimension less than said first diameter, and said outer choke conductor having an inner fourth dimension which defines a rectangular cross-section centered on said axis, said fourth inner dimension being larger than said second diameter;

a female portion including an electrically conductive center choke conductor and an electrically conductive outer choke conductor, said inner choke conductor of said female portion of said coaxial choke connector defining a closed-end axial aperture with respect to said longitudinal axis, said axial aperture having a sixth dimension larger than a fifth dimension and a second length, said center choke conductor of said female portion having an outer dimension equal to said first diameter, said outer choke conductor of said female portion having an inner dimension equal to said second diameter;

a first layer of solid dielectric material lying on one of (a) the outer surface of said center choke conductor of said male portion so that said center choke conductor with said layer of solid dielectric thereon has said fifth dimension smaller than said first diameter and (b) the inner surface of said closed-end axial aperture of said center choke conductor of said female portion; and

a second layer of solid dielectric material lying on one of (a) an outer surface of said outer choke conductor of said female portion, so that the overall outer dimension of said outer choke conductor of said female portion together with said solid dielectric material has a seventh dimension, smaller than said fourth dimension and (b) an inner surface of said outer choke conductor of said male portion.