Coaxial connector having a dielectric material for impedance matching

• US 20100007441A1
• Filed: 10/14/2008
• Published: 01/14/2010
• Est. Priority Date: 07/11/2008
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Yagisawa, Takatoshi, Ishikawa, Keiichi, Kirii, Yushi
• Granted Patent: US 7,952,449 B2
• Time in Patent Office: Days
• US Class Current: 333/185
• CPC Class Codes: H01P 5/026 between coaxial lines
• CPC Class Codes: H01R 13/6625 with capacitive component
• CPC Class Codes: H01R 2103/00 Two poles
• CPC Class Codes: H01R 24/44 comprising impedance matching means

Abstract

A coaxial connector includes a first inner conductor and a second inner conductor. A capacitor connects between the first inner conductor and the second inner conductor. An outer conductor extends along and surrounds the first and second inner conductors and the capacitor. A first dielectric material is filled in a gap between the outer conductor and the first and second inner conductors. A support member supports the first and second inner conductors with respect to the outer conductor. A second dielectric material for impedance matching is provided between the capacitor and the outer conductor.

Claims

1. A coaxial connector comprising:

a first inner conductor and a second inner conductor;

a capacitor connecting between the first inner conductor and the second inner conductor;

an outer conductor extending along and surrounding said first inner conductor, said second inner conductor, and said capacitor;

a first dielectric material filled in a gap between said outer conductor and said first and second inner conductors;

a support member supporting said first and second inner conductors with respect to said outer conductor; and

a second dielectric material for impedance matching provided between said capacitor and said outer conductor.

2. The coaxial connector according to claim 1, wherein said second dielectric material has a dielectric constant larger than a dielectric constant of said first dielectric material.

3. The coaxial connector according to claim 1, wherein said second dielectric material is a ring-shaped dielectric material attached to an outer circumference of said capacitor.

4. The coaxial connector according to claim 1, wherein an electrode at one end of said capacitor fits in a concave portion formed in an end surface of said first inner conductor;

an electrode at an opposite end fits in a concave portion formed in an end surface of said second inner conductor; and

said capacitor is physically and electrically connected to said first and second inner conductor.

5. The coaxial connector according to claim 4, wherein portions of said first and second inner conductors where said concave portions are formed are large diameter portions having an outer diameter larger than other portions of said first and second inner conductors, and a concave portion for impedance matching is formed in an inner surface of said outer conductor at a position facing the large diameter portions and said second dielectric material.

6. The coaxial connector according to claim 5, wherein said support member is attached to a vicinity of said large diameter portions of said first and second inner connectors, and accommodated and fixed in said concave portion formed in the inner surface of said outer conductor.

7. The coaxial connector according to claim 1, wherein said outer conductor includes a first outer conductor and a second outer conductor that are fit and integrated with each other

8. The coaxial connector according to claim 5, wherein said second dielectric material has a shape to cover outer circumference portions of said large diameter portions of said first and second inner conductors.

9. The coaxial connector according to claim 5, wherein said second dielectric material is a resin that is applied to a circumference of said capacitor and cured.

10. The coaxial connector according to claim 5, wherein said second dielectric material is a member having a shape to cover outer circumference portions of said large diameter portions of said first and second inner conductors, and a resin is filled between the member and said capacitor.

11. The coaxial connector according to claim 1, wherein said first dielectric material is an air.

12. The coaxial connector according to claim 1, wherein a capacitance value of said capacitor is 10 nF to 1000 nF.

13. The coaxial connector according to claim 1, wherein a characteristic impedance of said coaxial connector is about 50 ohms and inner diameters of said first and second inner conductors are 0.4 mm to 1.27 mm.

14. The coaxial connector according to claim 1, wherein a connecting part connectable and disconnectable with another connector is provided on at least one end of said coaxial connector, and inner conductors and outer conductors fit with each other, respectively, by pushing said coaxial connector and the another connector toward each other.

15. The coaxial connector according to claim 14, wherein said connecting part is an SMP connector.

16. The coaxial connector according to claim 14, wherein said connecting part is an SMPM connector.

17. A radio frequency signal transmission method for transmitting a radio frequency signal through an inner conductor serving as a signal line, the radio frequency signal transmission method comprising:

causing the radio frequency signal to be input to and propagate through the inner conductor, an impedance between the inner conductor and an outer conductor serving as a grounding line being adjusted to a predetermined impedance; and

causing a component of the radio frequency signal to propagate through a capacitor provided in a middle of said inner conductor, an impedance at a portion of said capacitor installed being adjusted to match said predetermined impedance by a dielectric material provided around said capacitor.