JPH10294605A - Mount case for drop-in isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mount case which can adjust the distance between a magnet of drop-in isolator in a microwave circuit and the main body of case (gap length) without being affected by the height of drop-in isolator and can move a resonance frequency to the outside of the pass band of the drop-in isolator. SOLUTION: A drop-in isolator 3, for which a terminator for basic waves is provided at one part of film-form conductor 38 formed on a magnetic material substrate 31, is arranged inside the main body 1A of this mount case and between a magnet 6 of terminator and the main body 1A of case facing this magnet, a spacer 5 composed of a non-magnetic substance is provided so that a bias magnetic field impressed by this magnet 6 can be adjusted. In this case, a movable part for adjusting the distance (gap length) between the main body 1A of case and the magnet 6 is provided at the connecting part of spacer 5 to the main body 1A of case.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case structure for mounting a drop-in isolator in a microwave circuit, and more particularly to a case structure for mounting a drop-in isolator in a metal case.
The present invention relates to a mounting case in which an isolator is sealed or shielded.

[0002]

2. Description of the Related Art A drop-in isolator is, for example, a film conductor 3B formed on a magnetic material substrate 3A as disclosed in Japanese Patent Application Laid-Open No. 62-24701 (see FIGS. 5 and 6). Is provided with a fundamental wave terminator, and the magnet 6 of the terminator and the case body 10 for shielding are provided.
The bias magnetic field applied by the magnet 6 is adjusted by inserting a spacer 9 between the magnet 6 and A. For this reason, the drop-in isolator (indicated by reference numeral 3 in the figure)
Depending on the strength of the magnetic field of the magnet 6 to be used, a difference occurs in the height from the mounting board 2.

That is, a microwave circuit is constructed using the drop-in isolator 3 and the mounting case 10
When placed in the upper case body 10A and the lower case base 10B, the magnet 6 and the case are arranged depending on the maximum height of the drop-in isolator itself or the height of other accompanying parts. Between the main body 10A,
Inevitably, a considerable distance is left. As the distance increases, as shown in FIG.
A resonance frequency appears in the pass band of the in-isolator. Therefore, as described above, the spacer 9 is inserted between the magnet 6 and the case 10A in order to move the resonance frequency out of the used band.

[0004]

However, since the height of the drop-in isolator 3 has an inevitable individual difference in the manufacturing process, the distance between the case body 10A and the magnet 6 is reduced. It is difficult to always set a close gap with a subtle gap. Therefore, as shown in FIG. 4B, the resonance frequency sometimes remains in the used band. Therefore, it has been considered that a spacer 9 corresponding to the distance is prepared and selectively used, but this only increases the cost.

An object of the present invention is to reduce the distance (gap length) between a magnet of a drop-in isolator and a case body in a microwave circuit.
It is an object of the present invention to provide a mounting case configured so that a resonance frequency that can be adjusted and developed without being affected by the height of an isolator is moved outside a pass band of a drop-in isolator.

[0006]

According to the present invention, a drop-in isolator in which a fundamental wave terminator is provided in a part of a film conductor formed on a magnetic material substrate is arranged in a case body. In addition, in a mounting case configured to provide a spacer made of a non-magnetic material between the magnet of the terminator and the case body facing the same to adjust the bias magnetic field applied by the magnet,
A movable portion for adjusting a distance (gap length) between the case main body and the magnet is provided at a position where the spacer is connected to the case main body.

Therefore, by adjusting the movable part, the drop
Even if the height of the in-isolator varies, the distance (gap length) between the magnet and the case body can be adjusted to the required value, and the resonance frequency can be adjusted within the pass band of the drop-in isolator. Can be completely escaped out of the used band.

[0008]

Embodiments of the present invention will be described below. 1 and 2, a drop-in isolator 3 in a microwave circuit is provided with a fundamental wave terminator at a part of a film conductor 3B formed on a magnetic material substrate 3A. Is provided on a mounting board 2 (material: glass epoxy, Teflon, modified BT resin, etc.), and is disposed in a mounting case 1 surrounding the whole.

The mounting case 1 has a box-shaped case body 1A made of metal (aluminum or brass) joined to a case base 1B with screws 4A and 4B so as to sandwich the mounting board 2. Inside, the magnet 6 of the terminator of the drop-in isolator 3 is opposed to
Spacers (e.g., aluminum, brass, stainless steel, or a non-magnetic material whose surface is plated with nickel or the like) 5 of the same size (mainly, a diameter: 5 to 10 mm) are delicate. They are arranged with a gap.

The spacer 5 has a male screw 5 as a movable part.
A, and the male screw portion 5A is rotatably screwed to the corresponding female screw portion 7 formed in the corresponding case main body 1A. In this embodiment, the male screw portion 5A is formed integrally with the spacer 5, but as shown in FIG. 3, the male screw member 8 rotatably screwed to the female screw portion 7 is formed. A configuration in which a spacer 5 ′ is attached to the inner end may be adopted.

In this embodiment, the spacer 5 (or the male screw member 8) can be rotated from the outside of the case body 1A with a tool such as a screwdriver, so that the spacer 5 (or 5 ') and the magnet 6 are delicate. Adjustment of the gap.

The mounting case of the present invention has a drop-in circuit which forms a microwave circuit together with the mounting board 2.
Not only is it used for the shield of the isolator 3, but also for filters (waveguide filters, dielectric filters, etc.) with built-in drop-in isolators.
Of course, it can be applied.

[0013]

Next, an embodiment of the present invention will be described.
Here, aluminum is used as the material of the mounting case 1,
As the mounting substrate 2, a glass / epoxy substrate constituting a microwave circuit is used. The material of the spacer 5 is brass on which the male screw portion 5A is formed, and is entirely plated with nickel.

Similarly, the screws 4A and 4B for fastening the case together are made of brass, the surface of which is plated with nickel. A screw hole (female screw portion) 7 having the same diameter as that of the magnet 6 of the terminator: φ = 8 mm is formed in the case body 1A facing the drop-in isolator 3, and the screw hole 7 has the same diameter. The screw, that is, the male screw portion 5A of the spacer 5 is rotatably screwed.

Then, by screwing this screw,
The substantial distance between the magnet 6 of the drop-in isolator 3 and the case body 1A can be finely adjusted to a predetermined value. As a result, as shown in FIG. , The resonance frequency can be completely released from within the pass band.

[0016]

According to the present invention, as described in detail above, a drop-in isolator in which a fundamental wave terminator is provided in a part of a film conductor formed on a magnetic material substrate is disposed in a case body. And a mounting case configured to provide a spacer made of a non-magnetic material between the magnet of the terminator and the case body opposed thereto to adjust a bias magnetic field applied by the magnet. A movable portion for adjusting a distance (gap length) between the magnet and the magnet is provided at a connection point of the spacer to the case body.

Therefore, when the drop-in isolator is sealed in the mounting case, the resonance frequency appearing in the pass band of the isolator can be completely released outside the use band. Further, it is not necessary to prepare a plurality of thicknesses of spacers in advance, which can lead to cost reduction.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view showing another embodiment of the present invention.

FIG. 4 is a graph of insertion loss-frequency characteristics in the present invention and a conventional example.

FIG. 5 is an exploded perspective view showing a conventional example.

FIG. 6 is a cross-sectional view along the line BB of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mounting case 1A Case main body 1B Case base 2 Mounting board containing a microwave circuit 3 Drop-in isolator 3A Magnetic material board 3B Film conductor 4 Screw for case joint fastening 5, 5 'Spacer 5A Male screw part 6 Magnet 7 Female screw Part (screw hole) 8 Male screw member 9 Spacer 10A Case body 10B Case base

Claims (3)

[Claims] A drop-in isolator in which a terminator for a fundamental wave is provided in a part of a film conductor formed on a magnetic material substrate is disposed in a case body, and a magnet of the terminator and an opposing magnet are provided. In a mounting case in which a spacer made of a non-magnetic material is provided between the case body and the magnet body to adjust a bias magnetic field applied by the magnet, a distance (gap length) between the case body and the magnet is adjusted. A case for mounting a drop-in isolator, wherein a movable portion for adjusting the position is provided at a position where the spacer is connected to the case body. 2. The drop-in isolator according to claim 1, wherein the spacer has its movable portion operated from outside the case body to adjust the distance (gap length). Implementation case. 3. The spacer includes a male screw portion screwed to the case body, and the spacer body includes a female screw portion screwed to the male screw portion, whereby the movable portion is provided. The mounting case for a drop-in isolator according to claim 1 or 2, wherein: