JPH0131325B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a waveguide coaxial converter that is housed in a container or the like and is suitable for an input/output terminal of an electronic device that requires airtightness from the outside.

Containers that house electronic devices are required to be airtight in order to ensure stable operation of the precision devices. In particular, when there is a cooling part inside the container and there is a risk of condensation or icing, or when the inside of the container is pressurized or maintained in a vacuum, the airtightness of the container is essential.

In devices using waveguides as input/output terminals, airtight windows are provided in the waveguides to ensure the above-mentioned airtightness.

FIG. 1 is a partial cross-sectional view of a conventional waveguide coaxial transducer provided with the airtight window. A dielectric film 4 is inserted into the window, and an O-ring 5 is sandwiched between the dielectric film 4 and the waveguide 1 to form an airtight window. This airtight window prevents electromagnetic waves from leaking through the dielectric film 4,
The drawback was that sufficient strength against pressure could not be obtained at low frequencies below about 10 GHz. In addition, creating a structure to compensate for this would have disadvantages such as the waveguide itself becoming larger and the insertion loss against electromagnetic waves increasing.

Furthermore, if airtightness is to be achieved using the coaxial section 2 as shown in Fig. 2, airtightness must be ensured for both the inner conductor and the outer conductor, which only complicates the structure for fixing the airtight material 6. However, it also had the disadvantage of increasing loss with respect to electromagnetic waves and deteriorating matching characteristics.

The present invention has been made based on the above considerations, and its object is to provide a waveguide coaxial converter that can ensure airtightness without increasing electromagnetic wave loss or its shape.

In order to achieve the above object, the waveguide coaxial transducer according to the present invention covers the probe inserted into the conductor tube from the center conductor of the coaxial section with a cylindrical dielectric body with a closed end. The open end of the coaxial section is pressed against the wall of the waveguide through an O-ring to create an airtight state between the inside of the waveguide and the coaxial section or a container housing the circuit connected to the coaxial section. A waveguide coaxial transducer that seals the inside surrounded by an outer conductor or the inside of a container housing a circuit connected to a coaxial part, and the open end of the cylindrical dielectric body is moved in the direction of the open end from the terminal end side by a holding mechanism. It is configured so that it can be pressed into contact with the inner wall of the waveguide.

Alternatively, a cylindrical dielectric with a closed end is placed over the probe inserted into the conductor tube from the center conductor of the coaxial section, and the open end of the cylindrical dielectric is connected to the wall of the waveguide using an O-ring. to create an airtight state between the inside of the waveguide and a container housing the coaxial portion or a circuit connected to the coaxial portion, and house the inside surrounded by the outer conductor of the coaxial portion or the circuit connected to the coaxial portion. A waveguide coaxial transducer that seals the inside of a container, wherein a collar is provided at the open end of the cylindrical dielectric, and an outer conductor of a coaxial portion housed in the sealed container connects the collar to the cylindrical dielectric. The waveguide is pushed from the open end toward the terminal end so as to be brought into close contact with the outer wall of the waveguide.

According to the above structure, the object of the present invention can be completely achieved.

Hereinafter, the present invention will be explained in more detail with reference to the drawings.

FIG. 3 is a partial cross-sectional view of an embodiment of a waveguide coaxial converter according to the present invention. A probe 3 connected to the coaxial center conductor of a waveguide coaxial converter and inserted into the waveguide 1 is covered with a cylindrical dielectric body 7 with one end closed, and an airtight O-ring 6 is provided at the open end. The dielectric 7 is pressed with a holding mechanism 8 such as a screw from the opposite side of the waveguide from which the coaxial probe 3 is inserted to ensure airtightness. In this structure, it is necessary to increase the thickness of the dielectric cylinder 7, and a space is secured between the probe 3 and the inner wall of the dielectric 7 in order to match the electromagnetic waves.

FIG. 4 is a partially sectional view of another embodiment of the present invention, similar to FIG. 3. A collar 11 is provided at the open end of the dielectric cylinder 10, and an airtight O-ring 11 is attached to this portion. In this embodiment, the inside of the container housing the circuit connected to the coaxial portion is made airtight, and the outer conductor 2 of the coaxial portion is contained within the container.
As is clear from the figure, the collar 11 is pressed down by the outer conductor 2 of this coaxial portion. In this structure, since no external force is applied to the dielectric cylinder 10, the wall thickness can be made thin, and even if the inside of the cylinder 10 and the coaxial probe 3 come into close contact, there is no problem in matching electromagnetic waves.

As the dielectric material used in each embodiment, a material having good airtightness and low loss against electromagnetic waves, such as tetrafluoroethylene, is used.

As a result, a waveguide coaxial converter with good airtightness and electrical characteristics can be constructed with a small size and simple structure.

The structure shown in FIG. 4 also has the advantage that the dielectric cylinder 10 can also serve as a positioning tool for the probe 3.

As described in detail above, according to the present invention, the input/output terminal of an electronic device, particularly when the container is an airtight container that is pressurized or kept in a vacuum, can be used as an input/output terminal for airtight electromagnetic waves. A waveguide coaxial converter with good characteristics can be provided.

[Brief explanation of drawings]

Figures 1 and 2 are partial cross-sectional views of conventional waveguide coaxial transducers. The cases in which a section is provided are shown in each case. FIGS. 3 and 4 are partial cross-sectional views of first and second embodiments of the waveguide coaxial converter according to the present invention, respectively. 1... Waveguide section, 2... Coaxial section, 3... Probe, 4... Dielectric window of airtight window, 5, 9, 11...
Airtight O-ring, 6... airtight dielectric of coaxial section,
7, 10...Cylindrical dielectric material, 8...Press mechanism.

Claims (1)

[Claims] 1. A cylindrical dielectric with a closed end is placed over the probe inserted into the conductor tube from the center conductor of the coaxial section, and the open end of the cylindrical dielectric is connected with an O-ring interposed. It is pressed against the wall of the waveguide to create an airtight state between the inside of the waveguide and the coaxial part or a container housing the circuit connected to the coaxial part, and the inside surrounded by the outer conductor of the coaxial part or the coaxial part A waveguide coaxial transducer that seals the inside of a container housing a series of circuits, wherein the open end of the cylindrical dielectric is pushed from the termination side toward the open end by a holding mechanism to bring it into close contact with the inner wall of the waveguide. A waveguide coaxial converter characterized in that it is configured as follows. 2. Cover the probe inserted from the center conductor of the coaxial section into the conductor tube with a cylindrical dielectric with a closed end, and attach the open end of the cylindrical dielectric to the wall of the waveguide with an O-ring interposed. Pressing the waveguide to create an airtight state between the inside of the waveguide and a coaxial portion or a container housing a circuit connected to the coaxial portion, and a container housing the inside surrounded by the outer conductor of the coaxial portion or a circuit connected to the coaxial portion. A waveguide coaxial transducer whose inner part is sealed, wherein a collar is provided at the open end of the cylindrical dielectric, and an outer conductor of the coaxial section housed in a sealed container connects the collar to the cylindrical dielectric. A waveguide coaxial converter characterized in that it is configured to be pushed from the open end toward the terminal end and brought into close contact with the outer wall of the waveguide.