JPS60116208A - Resonator - Google Patents

Abstract

PURPOSE:To set easily a resonance frequency with small size by adopting a structure that a dielectric member to inner and outer faces of which a conductor coating film is applied is pushed to an outer conductor until being locked while using a center conductor member as a guide. CONSTITUTION:A step part 31a is provided near an open end of a cylindrical outer conductor 31 where one end is short-circuited and the other is opened. A doughnut form dielectric member 32 where a conductor 34 is coated outward and inward to a dielectric 33 as a film is inserted up to the step 31a between a spiral center conductor 35 and the outer conductor 31 projected from the short- circuit end of the conductor 31 toward the open end, the member 32 is locked by tightening a pin 37 of a fastening member 36. Thus, ununiform air gap produced among the conductors is avoided, the resonance frequency is set stably and also since the member 32 is fixed to the member 36 by the pin 37, an excellent effect against the vibration proof in X, Y directions is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention mainly applies to the HF band (frequency 0.3 to 3 GH
The present invention relates to a resonator that is small and has high Q (low loss) characteristics at z).

Conventional configuration and its problems Conventional UHF in the frequency band of 0.3 to 3 GHz
In the field of belts, as various devices become smaller and have higher performance, small and high Q
The development of (low loss) resonators has become an important issue.

Hereinafter, a conventionally used small coaxial resonator will be explained with reference to FIGS. 1 and 2.

Figure 1 (A) is a cross-sectional view of a coaxial resonator whose tip is constructed of double coax, and Figure 1 CB) is A-A in Figure 1 (A).
FIG. Now, the coaxial resonator shown in FIG. 1 can be divided into three regional transmission lines.

Area ■ is a space consisting of conductor 11 and conductor 13;
is a coaxial transmission line composed of an inner conductor and a conductor 13 an outer conductor. Similarly, region (2) is a space consisting of conductors 11 and 12, and is a coaxial transmission line in which conductor 11 is an inner conductor and conductor 12 is an outer conductor. Further, region (2) is a space made up of the conductor 12 and the conductor 13, and constitutes a coaxial transmission line in which the conductor 12 is an inner conductor and the conductor 13 is an outer conductor.

Next, another small coaxial resonator will be explained using FIG. 2.

FIG. 2 shows a resonator having a structure in which region (2) in FIG. 1 is filled with a dielectric material 24. In FIG. According to the structure shown in FIG. 2, further miniaturization can be achieved by filling the region (2) in FIG. 1 with dielectric material 24. However, since it is very difficult to precisely process the outer and inner surfaces of a dielectric having a coaxial structure, there may be unevenness between the dielectric 24 and the fourth body 22, and between the dielectric 24 and the conductor 23. A void will be created. Therefore, it has the disadvantage that it is very difficult to set the resonant frequency of the resonator. moreover,
The coaxial resonator shown in FIG. 2 has a structure in which the dielectric 24 is mechanically supported by the conductors 22 and 24, so it has excellent vibration resistance in the direction of arrow y, but it has excellent vibration resistance in the direction of arrow It has the disadvantage of being inferior in gender.

Purpose of the Invention The present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a resonator that is small in size, allows easy setting of the resonant frequency, and has excellent vibration resistance. With the goal.

Structure of the Invention The present invention includes a hollow outer conductor having one end short-circuited and the other end open, and the diameter of the open end being larger than the diameter of the short-circuited end; A center conductor member protruding from an end toward an open end, and a dielectric member whose inner and outer surfaces are coated with a conductor, and the dielectric member is guided by using the center conductor member as a guide. The above purpose can be achieved by simply inserting it halfway into the external conductor.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a side sectional view of the resonator in the first embodiment of the present invention, and FIG. 3(B) and FIG. 3(A) A-A #;!
A cross-sectional view is shown.

In FIG. 3, 31 is a cylindrical external conductor, one end of which is short-circuited and the other end is open. In particular, a stepped portion 31a is provided near the open end.

Reference numeral 32 denotes a donut-shaped dielectric member, which is constructed by coating the outer and inner surfaces of a dielectric member 33 with a conductor 34 . 35 is a screw-shaped center conductor that protrudes from the short-circuited end of the outer conductor 31 toward the open end.

Reference numeral 36 denotes a stopper member which locks the dielectric member 32 by tightening the pin 37 after the dielectric member 32 is inserted at the stepped portion 31a'' provided on the outer conductor 31.

According to the above configuration, by using the dielectric member 32 in the region (3), it is possible to make the resonator smaller than the resonator structure shown in FIG.

That is, area 1. The impedance of the coaxial transmission line of each part of n and II is 21. Z2. Z3, and the line lengths are U+Q and 2r"5, respectively, and the resonance condition of this resonator, ignoring the end effect, is (tanβ012+ + K2 ・t anβo"z
) ” tan B, us = KM.

For example, 4 is 400 (MHz), a1=2
．． 50-).

a2 = 8.00 (1#l) l b1 =
10.0 (+〃)1;1) , l)2 = 7.75
(MIN) IL = 15.0 (++711
), relative dielectric constant 'r= 36 tL, , If we set x2=x5, it becomes 23×3.6 (bet), and the total length of the resonator (i, +
Rs) becomes 18.5 (l+shoulder). On the other hand, in the case of FIG. 1, p = 42.5 (+1 m), 9, and the total length of the resonator (n1 + 23) = 67, s (nnrt). Therefore, in this embodiment, the length is reduced by 18·5157.5 degrees, 32 times, compared to the conventional coaxial resonator, and miniaturization becomes possible.

According to the configuration shown in FIG. 3, since the conductor 34 is directly coated on the dielectric 33, the dielectric 24 and the conductor 22, which are the shortcomings of the resonator structure shown in FIG. It is possible to eliminate uneven nitrogen gaps that occur between the dielectric 24 and the conductor 230, and to set a stable resonant frequency.

At the same time, since the cylindrical dielectric member 32 having a coaxial structure is fixed with the stopper part 36 and the pin 37, it has an excellent effect on vibration resistance in the X direction and the X direction. If this is required, a step-shaped coaxial cylindrical dielectric member 40 as shown in FIG. 4 can be used to provide even more vibration resistance.

Miniaturization is possible.

Further, as shown in FIG. 5, a flange 61 is provided at the open end of the outer conductor 31A, and a stepped coaxial cylindrical dielectric
When inserted, it is much easier to fix to the housing etc. than with conventional shapes, and it also provides excellent vibration resistance.

Further, in the embodiments shown in FIGS. 3, 4 and 5, all the cross sections perpendicular to the axial direction are circular, but this need not be circular. For example, as shown in Figure 6,
The cross section may be entirely rectangular, or a portion may be circular and the rest may be rectangular.

The resonator configured as above is shown in Fig. 7.
For example, it can be applied to a three-stage bandpass P-wave device. In Fig. 7, 71 is the output connector, A2 is the tuning screw,
73 is an input/output coupling content, and 4 is an interstage coupling capacitor.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, the present invention provides a dielectric member having a coaxial structure in which only the outer peripheral surface and inner peripheral surface of the dielectric material are coated with metal.
By connecting to a four-wavelength coaxial resonator, it has a structure that creates a double coaxial structure at the tip of the resonator.
It is possible to downsize compared to conventional resonators, and at the same time, since the dielectric is directly coated with metal, it is possible to set a stable resonant frequency, and it is also possible to improve the mounting of the resonator. It has a very good structure and excellent vibration resistance, and its industrial value is extremely large.

[Brief explanation of the drawing]

Figure 1 (A) and Figure 2 (A) are side sectional views of a conventional coaxial resonator, Figure 1 (B) and Figure 2 (B) and Figure 1 (A). 2(A), FIG. 3(A) is a side sectional view of a resonator according to an embodiment of the present invention, and FIG. 3(CB) is a sectional view taken along line A-A in FIG. - A cross-sectional view, FIG. 4(A). 5 and 6 (A) are side sectional views of a resonator in another embodiment of the present invention, and FIG. 4 (B) and FIG. 6 (B)
are sectional views taken along line A-X in FIGS. 4(A) and 6(A), respectively, and FIG. 7 is a sectional view of a bandpass P-wave device showing an application of a resonator in an embodiment of the present invention. . 31.31m...Outer conductor, 31a...
・Step part, 32.40...Dielectric part A2.33
...Dielectric, 34...Conductor, 35...
... Center conductor, 36 ... Stopping member, 37-.
...Bin, 50...Flange. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure (C) (B) 8' Figure 2 (A) (B) Figure 3 (Pano (B) Figure 4 (C) (f3)

Claims (5)

[Claims] (1) a hollow external conductor having one end short-circuited and the other end open, and a diameter near the open end being larger than a diameter near the short-circuiting end;
A center conductor member is provided inside the outer conductor and protrudes from the short-circuited end to the open end of the outer conductor, and a conductor coating is applied to the inner and outer surfaces of the dielectric, and the diameter is equal to the diameter of the outer conductor. comprising a dielectric member having a diameter substantially equal to the diameter near the open end of the conductor, and using the center conductor member as a guide,
A resonator characterized in that the dielectric member is inserted into the outer conductor until it is locked. (2) The resonator according to claim 1, wherein the center conductor member has a stopper member and a pin for locking the dielectric member after the dielectric member is inserted into the outer conductor. (3) The open end of the outer conductor has a diameter that allows insertion of the dielectric member, and the vicinity of the short-circuited end of the outer conductor has a diameter that prevents insertion of the dielectric member. A resonator according to range 1. (4) The resonator according to claim 1, wherein a part of the diameter of the dielectric member is larger than the diameter of the open end of the outer conductor. (5) The resonator according to claim 1, wherein a flange is provided at the open end of the outer conductor.