Vertical-transition structure

Patent metadata

Field	Value
Publication number	US-10116031-B2
Application number	US-201615175078-A
Country	US
Kind code	B2
Filing date	Jun 7, 2016
Priority date	Jun 11, 2015
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

A vertical-transition structure comprises a microstrip line and a combination of a coaxial connector and a metallic ring underneath the microstrip line. A first through hole is created next to the microstrip line and near one end of its signal line. The metallic ring has a second through hole. The coaxial connector has a center conductor including an extended portion to be inserted into the second through hole via its center, and subsequently through the first through hole to connect to the signal line vertically. Specially, the extended portion is not inserted through the center of the first through hole. The present structure can improve the high-frequency insertion loss of the vertical transition caused by the sudden change of electromagnetic field distributions from a coaxial line to a microstrip line and the resonant response of the coaxial connector, and therefore, increase the 1-dB transmission passband of the vertical transition substantially.

First claim

What is claimed is:

1. A vertical-transition structure comprising:
a microstrip line, comprising a substrate with an upper surface and a lower surface opposite to the upper surface, a signal line laid on the upper surface of the substrate and a ground plane laid on the lower surface of the substrate, wherein a first through hole is created next to the microstrip line and near one end of the signal line, and the first through hole penetrates through the substrate and the ground plane, and a configuration of the first through hole defines a first geometric center;
a metallic ring, placed underneath the microstrip line, and having a second through hole; and
a coaxial connector, having a center conductor, a dielectric body and an external conductor, wherein a portion of the external conductor is a mounting wall for the purpose of mechanical assembly, the center conductor comprises a first part and a second part, the first part of the center conductor is surrounded by the dielectric body, which fills the space between the first part of the center conductor and the external conductor, the second part of the center conductor extends out of the mounting wall, passing through the second through hole of the metallic ring first and then passing through the first through hole next to the microstrip line, wherein the position of the center conductor within the first through hole is eccentric with respect to the first geometric center, and at last the center conductor is connected to the signal line, and an extension direction of the center conductor is perpendicular to a longitudinal direction of the signal line;
wherein the second through hole has an inner wall, a configuration of the second through hole defines a second geometric center, wherein the second part of the center conductor of the coaxial connector passes the second geometric center of the second through hole but does not contact the inner wall of the second through hole; and
wherein the second part of the center conductor is an extended portion, the extended portion has a cross section with an area, the area of the cross section is smaller than an area enclosed by an edge of the first through hole, wherein the first through hole has an inner wall comprising a first inside wall portion and a second inside wall portion, the first inside wall portion is opposite to the second inside wall portion and is next to the end of the signal line, wherein the first geometric center is located at the center of the area enclosed by the edge of the first through hole, and the extended portion of the center conductor abuts against the first inside wall portion of the first through hole and then is connected to the end of the signal line and is far from the second inside wall portion, so as to create an eccentric structure within the first through hole.

2. The vertical-transition structure as claimed in the claim 1 , wherein the metallic ring and the coaxial connector are integrated as a single part.

3. The vertical-transition structure as claimed in the claim 1 , wherein the first through hole next to the microstrip line and the second through hole of the metallic ring are circular, the cross section of the center conductor is circular, a diameter of the first through hole is bigger than a diameter of the cross section of the center conductor, and a diameter of the second through hole is bigger than the diameter of the cross section of the center conductor.

4. The vertical-transition structure as claimed in the claim 3 , wherein the metallic ring and the extended portion of the center conductor of the coaxial connector are combined to constitute a coaxial structure with a cutoff frequency of a first higher-order mode approximately equal to 45 GHz.

5. The vertical-transition structure as claimed in the claim 3 , wherein the substrate has a specific dielectric permittivity and a first thickness.

6. The vertical-transition structure as claimed in the claim 3 , wherein a preferred diameter for the first through hole next to the microstrip line is 5.842 mm.

7. The vertical-transition structure as claimed in the claim 3 , wherein the metallic ring has an outside circumference and a second thickness, wherein the outside circumference has the same configuration and size as those of the mounting wall of the coaxial connector for the purpose of integration into one part, and a preferred value for the second thickness is 1.5 mm, and a diameter for the second through hole is 2.921 mm.

Assignees

• Univ Nat Taipei Technology

Inventors

• Li Eric S
• Huang Hong-Wei

Classifications

• H01R12/75

  connecting to cables except for flat or ribbon cables · CPC title

• H01R24/44 Primary

  comprising impedance matching means · CPC title

• H01P5/085 Primary

  Coaxial-line/strip-line transitions · CPC title

• H01R2103/00

  Two poles · CPC title

• H01R24/52

  mounted in or to a panel or structure · CPC title