JPS633213Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a dielectric coaxial type band-elimination transducer (hereinafter abbreviated as dielectric coaxial transducer) in the VHF band and UHF band.

In the VEF and UHF bands, dielectric coaxial transducers used in general communication equipment have an unspecified number of frequencies (resonant frequencies of the transducers) used.

By the way, in the conventional dielectric coaxial wave device, it was necessary to set the axial dimension of the dielectric material for each individual operating frequency (resonance frequency) and to process and manufacture the dielectric material.

However, since dielectric materials such as ceramics have extremely high hardness, it is extremely difficult to process them to suit each case. In addition, the dimensions of the dielectric coaxial resonant element are shortened in advance and manufactured.
If an attempt is made to support a wide range of operating frequencies by adding a capacitance such as a capacitor, there is a drawback that Q deteriorates and the desired electrical characteristics cannot be obtained.

This idea was made in view of the above circumstances,
The purpose is to provide a dielectric coaxial band-elimination waveguide that can handle a wide frequency range and an unspecified number of operating frequencies with constant dielectric dimensions and provides good electrical characteristics. .

In this invention, a notch is provided along the axial direction at one end of a cylindrical dielectric that constitutes a dielectric coaxial resonant element, and has a length that takes into account the variable range of the resonant frequency. One end of a metal rod for mounting a coupling capacitor is attached to a position corresponding to the operating frequency in the notch on the outer peripheral surface of the central conductor rod. As a result, by keeping the dimensions of the dielectric constant and changing only the dimensions of the center conductor rod, which is easy to manufacture, it is possible to respond to a wide range of unspecified frequencies with good electrical characteristics. It is something that can be done.

An embodiment of this invention will be described below with reference to the drawings. FIG. 1 shows a dielectric 1 used in a dielectric coaxial wave device according to this invention. This dielectric 1 is formed into a cylindrical shape, and two opposing notches 2 and 3 are formed at one end thereof. The depths of the notches 2 and 3 are determined in consideration of the variable range of the dimensions of the center conductor rods 17 to 19 (that is, the variable range of the resonance frequency), which will be described later. A metal coating 4 is applied to the outer circumferential surface of the dielectric 1 except for the portion where the notches 2 and 3 are provided and both end surfaces. In addition, the above-mentioned notches 2 and 3
may be only one of them.

FIG. 2 is a sectional view showing the structure of a dielectric coaxial wave device using this dielectric 1. As shown in FIG. Further, FIG. 3 is a sectional view taken along the line X-X' in FIG. 2. In FIGS. 2 and 3, 11 is an outer conductor casing;
The inside of this outer conductor housing 11 has partitions 12 and 13.
It is divided into three rooms. Dielectric coaxial resonant elements 14, 15, and 16 using the dielectric 1 described above are arranged in these chambers, respectively. The dielectric coaxial resonant elements 14 to 16 are each constructed by inserting center conductor rods 17, 18, and 19 into a hollow portion of the dielectric 1. Further, as shown in FIG. 3, a grounding printed circuit board 20 is disposed on the side surface of the outer conductor casing 11 at right angles to the bottom surface of the outer conductor casing 11. Note that the printed circuit board 20 may be a metal plate that can be easily fixed by soldering, conductive adhesive, or the like. Dielectric coaxial resonant element 14~
16 is arranged such that the end surface on the side where the notches 2 and 3 are not provided faces the printed circuit board 20, and the center conductor rod 17 is connected to the center conductor rod 17 by screws 21.
19 to the printed circuit board 20, the metal coating portion on the outer surface is conductively fixed to the printed circuit board 20. 22 is also a printed circuit board and is arranged horizontally through each room. A phase shift element for electrically connecting the dielectric coaxial resonant elements 14 to 16 is arranged on the printed circuit board 22, and a metal coating on the outer surface of the dielectric 1 is conductively fixed to these elements. Dielectric coaxial resonant element 14-1
The central conductor rods 17 to 19 of No. 6 have their notches 2.
One ends of thin metal rods 23, 24, 25 are attached to the center conductor rods 17-19 at approximately right angles. One ends of variable coupling capacitors 26, 27, and 28 are connected to the other ends of these metal rods 23 to 25, respectively. Coupling variable capacitor 26~
The other end of each of 28 is connected to each phase shift element of the printed circuit board 22, as shown in FIG. In addition, in Fig. 2, 29 is the input connector, 3
0 is an output connector, and 31 is an upper lid.

FIG. 4 shows a case where the center conductor grounding portion in FIG. 3 is made into a movable structure, and 32 is a center conductor receiving seat for movable the center conductor rod 17 in a grounded state. FIG. 5 is an equivalent circuit of the dielectric coaxial wave device having the structure shown in FIG. In FIG. 5, L ₁ ,
L ₂ and L ₃ are the inductances of the variable dielectric coaxial resonant elements 15 and 16, respectively, and C ₁ , C ₂ , and C ₃
are the coupling capacitances of the coupling variable capacitors 26 to 28, respectively. A dielectric coaxial resonator is formed by these inductances and capacitances, and each resonator is connected by phase shift circuits 33 and 34. That is, a three-stage dielectric coaxial wave device is constructed.

In this dielectric coaxial wave device, notches 2 and 3 are formed in the dielectric 1, and a center conductor rod 17 is formed.
Since the structure is such that thin metal rods 23 to 25 are attached to the open end side of 19, and the metal rods 23 to 25 protrude from the notches 2 and 3, the dimensions of the dielectric 1 may be constant, and from the viewpoint of electrical characteristics, the center The conductor dimensions become shorter,
Even when the open ends of the central conductor rods 17 to 19 are located within the hollow portion of the dielectric 1, the coupling variable capacitors 26 to 28 can be easily connected. Therefore, the electrical length (inductance) of the dielectric coaxial resonant elements 14 to 16 can be easily changed or varied, and can be used over a wide range of unspecified frequencies without causing Q deterioration. This can be easily achieved with good electrical characteristics.

In carrying out the present invention, the construction method, shape, and number of stages of the dielectric coaxial resonant elements 14 to 16 are not limited to the methods described in the above embodiments, and it goes without saying that other methods may be used. .

As described above, according to this invention, the dimensions of the dielectric of the dielectric coaxial resonant element remain constant, and by changing only the dimensions of the central conductor, which is inexpensive and easy to manufacture, it can be used over a wide range of unspecified numbers of people. Since it can correspond to various frequencies, the production cost is extremely low. Further, since the best electrical length can be easily obtained for each individual frequency used, good electrical characteristics can be obtained without causing Q deterioration, and adjustment is also extremely easy. Furthermore, even if it becomes necessary to change the operating frequency due to circumstances after the product is completed, this can be easily handled.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a dielectric according to an embodiment of the invention, FIG. 2 is a sectional view showing the structure of a dielectric coaxial wave device using the above dielectric, and FIG. -X' arrow sectional view, FIG. 4 is a sectional view of another embodiment of the invention, and FIG. 5 is an equivalent circuit diagram of the wave generator shown in FIG. 4. DESCRIPTION OF SYMBOLS 1... Dielectric material, 2, 3... Notch part, 4... Metal coating, 11... Outer conductor housing, 14-16... Dielectric coaxial resonant element, 17-19... Center conductor bar,
20, 22...Printed circuit board, 23-25...Thin metal rod, 26-28...Variable coupling capacitor, 32...Center conductor receiving seat.

Claims (1)

[Claims for Utility Model Registration] 1. An outer conductor casing, a grounding plate disposed perpendicularly to the bottom surface of the outer conductor casing, a printed circuit board disposed parallel to the bottom surface of the outer conductor casing, and a cylindrical A center conductor rod is placed in a hollow part of a dielectric body, which has a notch along the axial direction on one end surface, and a metal film is coated on the outer peripheral surface excluding the notch and both end surfaces. A plurality of dielectrics are inserted, the end face of which is not provided with the notch part is arranged opposite to the ground plate, and the metal coating on the outer peripheral surface is conductively fixed to the ground plate and the printed circuit board. A dielectric coaxial type band elimination device comprising a body coaxial resonant element and a metal rod for attaching a coupling capacitor, one end of which is connected to the central conductor rod at the notch of the dielectric coaxial resonant element. Wave equipment. 2. The dielectric coaxial band-removal device according to claim 1, which has a receiving seat for the center conductor rod on the outside of the ground plate, and the center conductor rod is movable in a grounded state.