JPS6016082Y2 - Dielectric coaxial resonator filter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a dielectric coaxial resonator type filter in which the coupling coefficient between resonators can be finely adjusted.

Conventionally, a coaxial resonator having a cross-sectional structure as shown in FIG. 1 has been put into practical use.

To explain this, 1 is a metal outer conductor, 2 is an internal center conductor, and 4 is a capacitance which will be described later.

A coaxial resonator with this structure is used for television receivers.
Commonly used in HF tuners.

FIG. 2 is a perspective view of a dielectric coaxial resonator that is constructed based on the basic shape shown in FIG. 1 and is in practical use.

In FIG. 2, parts having the same functions as those in FIG. 1 are designated by the same reference numerals.

The difference from FIG. 1 is that 3 has a dielectric material.

In FIGS. 1 and 2, when the center conductor length 1 is one-fourth or less of the wavelength of the resonant frequency, a parallel resonant circuit is formed when the conductor is terminated with a capacitor 4.

When a filter is formed by continuously connecting a plurality of dielectric coaxial resonators terminated with capacitance 4, a third
As shown in the figure, it is necessary to connect a coupling capacitor 5 between the two center conductors 2, 2.

However, when the coupling capacitor 5 is used in this way, there are problems in that the number of components increases, the capacitance value that realizes the optimum band characteristics is limited, and fine adjustment of the band characteristics is difficult.

The present invention eliminates the drawbacks of the conventional example by removing a portion of the outer conductor of each dielectric coaxial resonator and connecting both resonators rotatably with a support shaft. A dielectric coaxial resonator type filter is provided.

Hereinafter, the present invention will be explained based on the illustrated embodiments.

FIG. 4 is a perspective view of an embodiment of the present invention, and parts that perform the same operations as in FIG. 3 are given the same reference numerals.

The embodiment shown in FIG. 4 is a case in which two dielectric coaxial resonators are connected in series to form a filter, and 1 is an external conductor;
2 is a center conductor, 3 is a dielectric, and 4 is a terminal capacitor.

Reference numeral 6 denotes a coupling window from which the external conductor has been removed, and although it is not visible in the drawing, a similar coupling window is provided in the opposing portion of the other dielectric coaxial resonator (on the right).

7 is for coupling the two dielectric coaxial resonators 1, 1,
This is a support shaft inserted and attached to a hole drilled in the connecting windows 6, 6.

As a result, the two dielectric coaxial resonators 1, 1 are arranged in parallel at a predetermined interval, and with the support shaft 7 as the center,
One dielectric coaxial resonator can be rotated at any angle relative to the other.

With this configuration, two dielectric coaxial resonators 1,
If the angle θ between the center lines A and B of 1 is changed around the support shaft 7 as shown in FIG. 5, the coupling coefficient can be varied and a desired band characteristic can be achieved.

As described above, the dielectric coaxial resonator filter of the present invention can easily change the coupling coefficient, thereby realizing arbitrary band characteristics.

Furthermore, the coupling capacitance that was conventionally required is no longer necessary, and the number of parts can also be reduced.

Of course, the present invention can be similarly implemented when using three or more dielectric coaxial resonators.

[Brief explanation of the drawing]

Fig. 1 is a basic structural diagram of a coaxial resonator, Fig. 2 is a basic structural diagram of a dielectric coaxial resonator, Fig. 3 is a perspective view of the main part of a conventional dielectric coaxial resonator filter, and Fig. 4 is a basic structural diagram of a dielectric coaxial resonator. FIG. 5 is a perspective view of a main part of an embodiment of the invention, and FIG. 5 is a schematic diagram for explaining the embodiment. 1...Outer conductor, 2...Center conductor, 3
...Dielectric, 6...Coupling window, 7...
...Spindle.

Claims (1)

[Scope of utility model registration request] In order to mechanically couple the first and second dielectric coaxial resonators, each having a portion of the outer conductor removed, and the first and second dielectric coaxial resonators at a predetermined interval, the respective outer conductors a support shaft attached to the removed portion of the first
and a second dielectric coaxial resonator, one of which is rotatable about the supporting shaft relative to the other,
A dielectric coaxial resonator filter characterized in that the coupling state between dielectric coaxial resonators is variable.