# US 12,763,449 B2 · Transition between a central contact of a coaxial component and a transmission line, in particular a radio-frequency transmission line

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- Number: US 12,763,449 B2
- Document ID: US12763449B2
- Status: Granted
- Kind: B2
- Application number: 18/605,608
- Filed: 2024-03-14
- Published: 2024-10-17
- Granted: 2026-10-13
- Earliest claimed: 2023-03-16
- Assignees: Radiall
- Applicants: Radiall SA
- Inventors: Fleury Grandjean; Youssef Dahmani
- Web page: https://patentgrep.com/patent/US12763449B2

## CPC

- H01P 5/085: {Coaxial-line/strip-line transitions}
- H01P 1/225: {Coaxial attenuators (H01P1/23 takes precedence)}
- H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B)

## Abstract

An improved transition between a central contact of a coaxial component and a transmission line, such as a radio-frequency transmission line, is provided. The transition may be between a central contact of a coaxial component and a transmission line of a circuit such as a radio-frequency circuit. The central contact has a cylindrical front portion and, extending its front portion, a rear portion that makes contact with the transmission line and that is fastened thereto by a solder joint. The rear portion has at least one gap, defining a volume forming a reserve for the solder of the solder joint.

## Claims

### Claim 1

A transition between a central contact of a coaxial component and a transmission line of a circuit, the central contact comprising:
a cylindrical front portion and,
extending from the front portion, a rear portion that makes contact with the transmission line and that is fastened thereto by a solder joint, the rear portion having at least one gap, defining a volume forming a reserve for the solder of the solder joint, configured to absorb excess solder.

### Claim 2 (depends on 1)

The transition as claimed in claim 1, wherein the rear portion incorporating the gap is flat, and bounded by two plane faces.

### Claim 3 (depends on 2)

The transition as claimed in claim 2, wherein the rear portion is a right parallelepiped or a shape of trapezoidal cross section.

### Claim 4 (depends on 2)

The transition as claimed in claim 2, wherein the height between the two plane faces is between 0.1 and 0.3 mm.

### Claim 5 (depends on 1)

The transition as claimed in claim 1, wherein the gap is open height wise.

### Claim 6 (depends on 5)

The transition as claimed in claim 5, wherein the gap further opens onto at least one free end of the rear portion of the central contact.

### Claim 7 (depends on 5)

The transition as claimed in claim 5, wherein the open gap is at least partially cylindrical or parallelepipedal in shape.

### Claim 8 (depends on 1)

The transition as claimed in claim 1, wherein the cylindrical front portion of the central contact is away from the circuit.

### Claim 9 (depends on 8)

The transition as claimed in claim 8, wherein a distance between the cylindrical portion of the central contact and a facing edge of the circuit is between 0.1 and 0.8 mm.

### Claim 10 (depends on 1)

The transition as claimed in claim 1, wherein the circuit is a suspended-microstrip circuit and has a dielectric substrate, a major face of the dielectric substrate having the transmission line which takes the form of a microstrip, and conductive ground lines intended to be soldered to a part of the coaxial component, so as to suspend the circuit in a ground conductor formed by said part.

### Claim 11 (depends on 1)

The transition as claimed in claim 1, wherein the circuit is a coplanar circuit and has a dielectric substrate, a major face of which has the transmission line, which takes the form of a strip, inserted into a coplanar ground plane at a distance from the strip.

### Claim 12 (depends on 1)

The transition as claimed in claim 1, wherein said transition is configured to operate from DC to 100 GHz, DC being the acronym of direct current.

### Claim 13 (depends on 1)

A passive or active electronic device comprising: at least one transition as claimed in claim 1.

### Claim 14 (depends on 13)

The passive electronic device as claimed in claim 13, forming a coaxial component selected from an attenuator, a divider, a combiner, a coupler, and a load.

### Claim 15 (depends on 14)

The electronic device as claimed in claim 14 comprising: a cartridge that forms part of the coaxial component and that is bounded by a sidewall comprising at least one electrically conductive region within which the circuit is fastened, at least one conductive ground line being connected to said electrically conductive region by at least one electrical connection ensured by a solder joint, said sidewall being passed through by a through-hole that extends right through the thickness of said sidewall and that provides direct access to the electrical connection allowing inspection of said electrical connection therein.