JPS645354Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] This invention relates to an airtight coaxial connector.

[Background technology]

A conventional airtight coaxial connector is shown in FIG.
In the figure, 1 is an outer conductor, 2 is a center conductor, 3 is an insulator, and 4 is an airtight sealing material. Here, as the airtight sealing material 4, a ceramic dielectric material, a glass material for hermetic sealing, or the like is used.

In addition, since the insulator 3 and the airtight sealing material 4 have different dielectric constants due to their different materials, if the center conductor 2
If the thickness is uniform, an impedance mismatch will occur between the portion wrapped in the insulator 3 and the portion wrapped in the airtight sealing material 4. For this reason, as shown in FIG. 1, the thickness of the central conductor 2 is made thinner at the portion located within the airtight sealing material 4 than the thickness of the central conductor 2 located within the insulator 3 in order to match the impedance. .

[The problem that the idea aims to solve]

Conventionally, as a means for impedance matching as described above, a structure is used in which the thickness of the center conductor is changed stepwise between the insulator side and the hermetic sealing material side.

Therefore, connectors with conventional structures have disadvantages in that processing costs for the center conductor are high, and sufficient impedance matching cannot be obtained due to uneven processing of the center conductor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a connector with excellent high frequency characteristics using inexpensive means.

[Means to solve the problem]

In the connector of the present invention, an insulator is provided between a center conductor and an outer conductor arranged coaxially, and a ceramic dielectric material for airtight sealing is filled between the center conductor and the outer conductor adjacent to the insulator. The present invention is characterized in that the diameter of the center conductor is made uniform by providing the hermetic sealing ceramic dielectric with a cut portion that is arranged rotationally symmetrically with respect to the center and does not penetrate in the axial direction.

[Effect]

In the present invention, impedance matching between the ceramic dielectric for airtight sealing and the insulator side is achieved by providing an appropriate cutout in the ceramic dielectric for airtight sealing, so the diameter of the center conductor can be adjusted on both sides. It can be made uniform. In addition, since ceramic dielectric is used as the airtight sealing material,
The cutout portion for impedance matching can be easily formed by forming the cutout portion in the green hermetic sealing ceramic dielectric material during pre-firing molding and then firing it. Furthermore, since the cut portion does not penetrate the hermetic sealing ceramic dielectric in the axial direction, impedance matching can be achieved without impairing the hermetic sealing performance of the connector.

On the other hand, if a glass material for hermetic sealing, which is commonly used as an airtight sealing material, is used, for example, it is impossible to form a cutout part by drilling after filling and hardening the glass material. It is also difficult to form the cutout portion before curing and to melt and harden the glass material while maintaining the cutout portion in a perforated state. Moreover, when performing stepped processing on the center conductor, cutting work is required, resulting in high processing costs.

Therefore, according to the present invention, impedance matching of the connector can be achieved by simple means and at low cost without impairing the airtight sealing performance.

Furthermore, since the cutout portion of the present invention is arranged rotationally symmetrically with respect to the axial center, a uniform electromagnetic field is generated inside the center conductor, and there is no processing unevenness such as when performing stepped processing on the center conductor. This problem is solved and excellent high frequency characteristics can be obtained.

〔Example〕

Examples of this invention will be described below with reference to the drawings.

5 in the figure is a ceramic dielectric material for airtight sealing used in the embodiment of this invention, which has a cylindrical shape.
Electrodes are provided on the outer and inner circumferential surfaces and are soldered to the inner circumferential surface of the outer conductor 1 and the outer circumferential surface of the center conductor 2, respectively, to maintain airtightness on both sides of the ceramic dielectric 5 for airtight sealing. The hermetic sealing ceramic dielectric 5 has a cut portion at a rotationally symmetrical portion with respect to its axial center. The cut portions may be circular grooves 6a, 6b as shown in FIGS. 3A, B, or circular holes 6c, 6d as shown in FIGS. 4A, B, for example.
The holes 6e and 6f have fan-shaped cross sections as shown in FIGS. 5A and 5B. This cut section 6a-6
Due to the presence of f, the apparent permittivity of the ceramic dielectric 5 for airtight sealing is the same as the permittivity of the insulator 3,
or to substantially the same extent. In this way, the diameter of the center conductor 7 can be made uniform in both the portion existing within the insulator 3 and the portion existing within the hermetic sealing ceramic dielectric 5.

[Effect of idea]

According to the present invention, impedance matching is achieved by using a ceramic dielectric airtight sealing material and providing a cutout portion that does not penetrate in the axial direction and is arranged rotationally symmetrically with respect to the axial center. Impedance matching can be obtained without impairing hermetic seal performance. Furthermore, impedance matching can be obtained by simple means at low cost, and the high frequency characteristics are also excellent.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional example, Fig. 2 is a sectional view of an embodiment of the present invention, and Figs. 3 to 5 show various examples of ceramic dielectrics for airtight sealing used in the embodiment of the present invention. Each figure A is a front view as seen from the insulator side, and each figure B is a back view thereof. 1 is an outer conductor, 3 is an insulator, 5 is a ceramic dielectric for airtight sealing, 6a to 6f are cut portions, and 7 is a center conductor.

Claims (1)

[Scope of utility model registration request] In a connector in which an insulator is provided between a center conductor and an outer conductor arranged coaxially, and a ceramic dielectric material for airtight sealing is filled between the center conductor and the outer conductor adjacent to the insulator, the connector is rotationally symmetrical with respect to the axial center. A connector characterized in that the diameter of the center conductor is made uniform by providing the ceramic dielectric for airtight sealing with a cut portion that does not penetrate in the axial direction.