JPH07111402A - Dielectric filter - Google Patents

Abstract

PURPOSE:To improve the reliability of the dielectric filter employing a linear antenna by adding a support base to the linear antenna so as to enhance the mechanical strength of the dielectric. CONSTITUTION:A probe antenna support 10 is provided to a lower part of a rod shaped input side antenna 2 and an output side antenna 3. The support base 10 is made of, e.g. a cordierite, its diameter is selected to be 3.5mmphi, its height to be 2.5mm and its thickness is to be 0.75mm. A cylindrical ceramics whose specific dielectric constant is 80, whose diameter 4.0mm and whose thickness is 1.7mm is used for a dielectric resonator 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric filter used in microwave communication devices and the like.

[0002]

2. Description of the Related Art A dielectric filter is constructed by arranging dielectric resonators in a row in a metal case. With the development of flying body technology represented by rockets such as communication hygiene in recent years, demands for mechanical strength such as impact resistance are becoming severe for parts mounted on these flying bodies. The conventional dielectric filter has no additional support for the linear antenna, and the linear antenna has a form of floating in the air. Therefore, it has a drawback that it is very difficult to maintain strength against mechanical external force such as vibration and impact.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a dielectric filter which enhances the mechanical strength of the dielectric filter against mechanical external force such as vibration and shock, and consequently suppresses deterioration of electrical characteristics. It is provided.

[0004]

In order to achieve the above object, the present invention comprises one or a plurality of cylindrical, cylindrical or prismatic dielectric resonators, and a linear antenna as an input / output probe. In the dielectric filter using, a support base is added to the linear antenna.

[0005]

The linear antenna shown in FIGS. 1 and 2 is arranged at both ends of the metal case of the dielectric filter. By holding these linear antennas using a support, deterioration of electrical characteristics can be suppressed and the mechanical strength of the dielectric filter can be increased against external forces such as shock resistance and vibration resistance. At this time, the support for holding the linear antenna is small within a range that can withstand external forces such as required shock and vibration, and has a low dielectric constant (relative permittivity of 5 or less) typified by cordierite and hollsterite. It is desirable to use a strong ceramic material in the order of 6th place).

Although there are glass materials such as quartz having a very low relative permittivity for the supporting base, the glass materials are unsuitable in view of withstanding external force. The reason why a strong support base with a low dielectric constant is adopted is not only mechanical strength but also consideration must be given so as not to adversely affect the insertion loss of the dielectric filter.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. 1 and 2 show the structure of a dielectric filter which is an embodiment of the present invention. The main components of the dielectric filter shown in FIGS. 1 and 2 are the dielectric resonator 1, the input side antenna 2, the output side antenna 3, the metal case 4 (outer diameter 20 × 55 × 10,
2. Inner diameter 8 × 50 × 5 (mm)), input side connector 5, output side connector 6, metal lid 7, frequency adjusting screw 8, dielectric resonator support 9, probe antenna support (made by Cordierite, 3. 5mmφ, height 2.5mm, thickness 0.75
mm) 10. For the dielectric resonator 1, a cylindrical ceramic having a relative permittivity of 80, a diameter of 4.0 mm and a thickness of 1.7 mm was used. Further, rod-shaped antennas were used as the input side antenna 2 and the output side antenna 3.

With respect to dielectric filters having the same structure, a dielectric filter in which a support base is added to a linear antenna and a dielectric filter in which a support base is not added are subjected to a vibration test as an external impact (random wave vibration). ) Was applied and the mechanical strength was compared.

As a test method, US military specification MIL-20
A vibration test was performed according to 2F. The average acceleration of the random wave vibration test is from 0 G to 9.3 G, and the vibration frequency at that time is from 20 Hz to 2000 Hz.

In a dielectric filter in which a support base is not added to the input / output linear antenna, the dielectric filter is destroyed by breaking the joint between the linear antenna and the connector at AE acceleration (5.4G). .

On the other hand, in the dielectric filter in which the supporting base is added to the input / output linear antenna, the AG of the above test item is used.
Even if random wave vibration was applied up to acceleration (9.3 G), the electrical characteristics were not deteriorated and the dielectric filter was not destroyed.

[0012]

Industrial Applicability Since the present invention can increase the mechanical strength of a dielectric filter and improve the reliability of the dielectric filter, its industrial effect is great.

[Brief description of drawings]

FIG. 1 is a diagram showing a top view of a dielectric filter that is an embodiment of the present invention.

FIG. 2 A- of a dielectric filter which is one embodiment of the present invention
It is a figure which shows an A'cross section figure.

[Explanation of symbols]

 1 Dielectric Resonator 2 Input Side Antenna 3 Output Side Antenna 4 Metal Case 5 Input Side Connector 6 Output Side Connector 7 Metal Lid 8 Frequency Adjustment Screw 9 Dielectric Resonator Support Stand 10 Probe Antenna Support Stand

Claims (1)

[Claims] 1. A dielectric filter comprising one or a plurality of cylindrical, cylindrical or prismatic dielectric resonators, wherein a linear antenna is used as an input / output probe, wherein a support base is attached to the linear antenna. A dielectric filter characterized by being added.