JPH06216606A - Cylindrical band pass filter and manufacture therefor - Google Patents

Abstract

PURPOSE:To make it possible to make a planar dimension small by forming a thin planar dielectric printed board into a roll form or a cylindrical one by the only board or in a state that two sheets of the board are overlapped. CONSTITUTION:This filter is composed of two sheets of flexible dielectric printed board 12 where a ground surface 10 is provided over the whole surface of one side surface is provided and plural stripline form conductor patterns 11 are arranged on the other surface and a cylindrical conductor core part 14 having a groove 13 extending over the total length in an axial direction. Surfaces 15 each other on which the conductor patterns 11 are arranged are wound on the outer peripheral surface of a conductor center part 14 in a state that both of the patterns do not come into contact with each other and in a state that two sheets of dielectric printed boards 12, 12 are overlapped so as to interpose output terminals 16, 17 connected with the conductor pattern 11. At this time, the end parts 18, 19 in the peripheral direction of the overlapped dielectric printed boards 12, 12 are force-fitted into the groove 13 of the conductor center part 14. An A part is soldered and ground surfaces 10 with each other are connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bandpass filter used in a high frequency circuit, and more particularly to a cylindrical bandpass filter whose plane dimension can be reduced and a method for manufacturing the same.

[0002]

2. Description of the Related Art Generally, there are various band pass filters, and strip line type filters and the like are known in the super high frequency band. FIG. 5 shows a conventional example of the stripline bandpass filter. Figure 5
FIG. 5A is an exploded perspective view of an example of the conventional stripline bandpass filter, and FIG. 5B is a sectional view of the bandpass filter. As shown in FIGS. 5 (a) and 5 (b), this conventional bandpass filter has a ground plane 1 on the entire surface of one side and a plurality of strip-line-shaped conductive lines on the other side. Two pieces, a dielectric printed board 3 having a conductor pattern of 2 and a printed board 3'having no conductor pattern, are attached so that the ground surface is on the outside, and input / output terminals 5 and 6 are added. It has been configured. FIG. 5B shows a structure in which the dielectric printed board 3 is put in a case 7.

However, as shown in FIG. 5, since the conventional bandpass filter has a wide plane, the plane dimension is large and the circuit (high frequency circuit) using it is also large. There was a flaw.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cylindrical bandpass filter which can be reduced in planar dimension and a method for manufacturing the same.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is a cylinder in which a dielectric printed board having a grounding surface on one side and a plurality of conductor patterns on the other side is wound around an outer peripheral surface of a conductor core. A groove extending in the axial direction is formed on the peripheral surface of the conductor core, and at least one end of the dielectric printed board wrapped around the outer periphery of the deep part is press-fitted and fixed in the groove. A method for manufacturing a cylindrical bandpass filter, in which a single dielectric printed board having a ground surface on one side and a plurality of conductor patterns on the other side is formed into a cylindrical shape by winding it in a roll shape. Then, a flexible dielectric printed board having a ground plane on one side and a conductor pattern consisting of a plurality of conducting lines on the other side is rolled into a cylindrical shape and mounted in a conductor tube. Circular dielectric And wherein like the conductor core to the inside of the cement board is disposed.

[0006]

The present invention will be described in detail below with reference to the illustrated embodiments. FIG. 1 shows an embodiment of a cylindrical bandpass filter according to the present invention. FIG. 1A is an overall perspective view of the cylindrical bandpass filter, and FIG.
1C is a cross-sectional view thereof, and FIGS. 1C and 1D are perspective views of a flexible dielectric printed board and a conductor core that are components of a cylindrical bandpass filter.

This cylindrical bandpass filter is shown in FIG.
As shown in (c), two flexible dielectric printed boards 12 each having a ground surface 10 on one side and a plurality of stripline-shaped conductor patterns 11 on the other side, and a shaft. It is composed of a cylindrical conductor core 14 having a groove 13 extending over the entire length in the direction. And FIG. 1 (a)
As shown in (b), the surface 15 on which the conductor pattern 11 is provided
2 in such a manner that the output terminals 16 and 17 connected to the conductor pattern 11 are sandwiched in a state where the patterns are not in contact with each other.
The dielectric printed boards 12, 12 are stacked and wound around the outer peripheral surface of the conductor core portion 14. At this time, the circumferential ends 18 of the dielectric printed boards 12, 12 that overlap each other,
19 is pressed into the groove 13 of the conductor core 14. Then, after that, the portion A in FIG. 1B is soldered and the ground planes 10 are connected to each other, thereby completing the process.

The thickness and dimensions of each side of the dielectric printed board 12 and the shape and size of the conductor core portion 14 are determined on the outer peripheral surface of the conductor core portion 14 in a state where two dielectric printed boards are stacked. When wound, the inner side surface of the dielectric printed board 12 comes into close contact with the outer peripheral surface of the conductor core portion 14, and the end portions 18, 19
It is set in advance so that can enter the groove 13 in a close contact state.

By configuring the bandpass filter as described above, its shape becomes a cylindrical shape, and the plane dimension can be made extremely small.

The present invention is not limited to the above embodiment, and various modifications and embodiments such as the following can be considered.

FIG. 2 shows a modified embodiment of the present invention.
Only one end 18 of the overlapped dielectric printed boards 12, 12 is inserted into the groove 13 of the conductor core 14, and the other end 19 is formed so that the overlap portion 20 is formed. The part 14 is wrapped so as to surround it. Then, the arrow C portion is soldered and the ground planes 10 are connected to each other to complete the process. Although the output terminals are not shown in the drawing, two dielectric printed boards 1 are provided as in the embodiment of FIG.
It is led out from the joint of 2 and 12. This modified embodiment also aims to downsize the bandpass filter.

Next, a second embodiment of the cylindrical bandpass filter according to the present invention will be described with reference to FIG.

As shown in FIG. 3, this cylindrical bandpass filter has a ground surface 10 on one surface and a plurality of stripline-shaped conductor patterns 11 and an insulating layer 26 on the other surface. Flexible dielectric printed board 27
Wind one end 18 of one end into a cylindrical shape in a roll shape, and finally solder the arrow E part to the ground surface 1
Complete by connecting 0 to each other. Although not shown in the figure, the output terminal is derived from the portion where the output terminals are overlapped in a roll shape. According to the second embodiment, the conductor core is unnecessary, which is convenient for downsizing and cost reduction.

Next, a third embodiment of the cylindrical bandpass filter according to the present invention will be described with reference to FIG.

As shown in FIG. 4, in the cylindrical bandpass filter, first, a plurality of stripline-shaped conducting lines 2 are provided.
A hollow cylindrical dielectric cylinder 22 having 1 on the outer peripheral surface is prepared, and a hollow or rod-shaped first conductive rod 23 serving as a ground surface is inserted into the inside of the dielectric cylinder 22. Then, the dielectric tube 22 holding the first conductive rod 23 therein is inserted into a hollow insulating sheet tube 24 such as Teflon or nylon, and the insulating sheet tube 24 is further inserted into a hollow second copper tube. Insert into 25 to complete.

[0016]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, since the thin-walled plate-shaped dielectric printed boards are formed alone or in the state of being stacked in a roll shape or a cylindrical shape, the plane dimension is reduced. It is extremely small, which greatly contributes to the miniaturization of circuits.

[Brief description of drawings]

1A and 1B are views showing an embodiment of a cylindrical bandpass filter according to the present invention, in which FIG. 1A is a perspective view, FIG. 1B is a sectional view, and FIGS. 1C and 1D are perspective views of components. is there.

FIG. 2 is a sectional view of a modification of the embodiment shown in FIG.

FIG. 3 is a second cylindrical bandpass filter according to the present invention.
It is a perspective view of an Example.

FIG. 4 is a third cylindrical bandpass filter according to the present invention.
It is an exploded perspective view of an example.

5A and 5B are diagrams showing a conventional stripline bandpass filter, in which FIG. 5A is a perspective view and FIG. 5D is a sectional view.

[Explanation of symbols]

1, 10 ... Ground plane, 2, 11, 21 ... Conducting line, 3 ... Dielectric printed board, 4, 15 ... Surface on which conductor pattern is arranged, 5, 6, 16, 17 ... Output terminal, 7 ... Case, 12, 27 ... Flexible dielectric printed board, 13 ... Groove, 14 ... Conductor core, 18 ... One end, 19 ……… The other end, 20 ……… Overlap part, 22 ………… Dielectric cylinder, 23 ………… First conductive rod, 24 ………… Insulating sheet cylinder, 25 ………… Second Copper tube, A, B, C, D, E ...
Soldering part,

Claims (5)

[Claims] 1. A state in which a dielectric printed board having a ground surface on one surface and a plurality of conductor patterns on the other surface maintains insulation between the conductor pattern and the conductor core portion on the outer peripheral surface of the conductor core portion. A cylindrical band-pass filter characterized by being wound into a cylindrical shape. 2. A groove extending in the axial direction is formed on the peripheral surface of the conductor core, and at least one end of a dielectric printed board wound around the outer periphery of the core is press-fitted and fixed in the groove. The cylindrical bandpass filter according to claim 1. 3. A cylindrical bandpass, wherein a dielectric printed board having a ground surface on one surface and a plurality of conductor patterns on the other surface is wound into a roll to form a cylindrical shape. filter. 4. A method for manufacturing a cylindrical bandpass filter, comprising: a flexible dielectric printed board having a ground surface on one surface and a plurality of conductor patterns on the other surface, and the pattern surface being an outer peripheral surface. A cylindrical band-pass filter manufacturing method, which is characterized in that it is formed into a cylindrical shape and is attached to an inner wall of a conductor cylinder. 5. The method for manufacturing a cylindrical bandpass filter according to claim 4, wherein a conductor core is provided inside the circular dielectric printed board.