JP3072140B2 - Distributor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distributor for equally dividing a high frequency signal used in a CATV system or the like.

[0002]

2. Description of the Related Art Conventionally, for example, a high frequency signal is divided into two parts.
There is a distributor that divides a signal into two equal parts by one two-partitioning transformer and then performs impedance matching by two matching transformers. In the above-mentioned two-way distributor, a required number of turns is wound around each core member forming one two-way distribution transformer and two matching transformers, and a distribution / matching set type is formed by connecting the terminals. Are known. Here, in general, the distributor has distribution loss characteristics between the input terminal of the distribution transformer and the output terminal of each matching transformer, and coupling loss characteristics between terminals between the output terminals of each matching transformer. In the distributor, the smaller the distribution loss, that is, the smaller the absolute value of the characteristic value, the better.
Also, it can be said that the larger the coupling loss between terminals, that is, the larger the absolute value of the characteristic value, the better.

[0003]

In general, the distribution loss and inter-terminal coupling loss of the above-described distributor are better in the higher band of the high frequency band and lower in the lower band as the number of windings of the winding is smaller. Conversely, there is such a characteristic that the larger the number of turns of the winding, the better the lower frequency side of the high frequency band and the worse the higher frequency side. In addition to this characteristic, the distribution loss characteristics and the coupling loss characteristics between terminals (hereinafter referred to as transmission characteristics) of the distributor tend to rapidly deteriorate at different frequencies in the high frequency band. On the other hand, it has been difficult to obtain a distributor having excellent transmission characteristics in a wide band. With the above problems in mind, the present inventors have conducted extensive experimental research and found that the transmission characteristics of the distributor are determined by the thickness of the peripheral portion of the core member where the matching transformer is formed and the central portion of the core member where the distribution transformer is formed. It was found to be governed by the thickness of the.
However, the core member has the following restrictions. The high frequency soft ferrite, which is a core member of the distributor, is manufactured by molding and sintering metal oxide powder or the like. In the above-described molding, the hole around which the winding of each transformer formed on the core member is wound is compressed in the axial direction. However, if the thickness of the core member in the axial direction is largely different, there is a problem that the compression pressure is not uniformly transmitted to the material, the composition density is not uniform, and the mold is damaged. If the composition density is non-uniform, the magnetic permeability of the core member may be non-uniform, or the final product may be chipped or cracked due to the influence of material sintering due to sintering. It adversely affects the characteristics and is not preferable.
Further, if the mold is damaged, stable production becomes impossible.
For this reason, there is virtually no production of core members having greatly different thicknesses.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem. It is an object of the present invention to set the thickness of the central part of the core member freely with respect to the thickness of the peripheral part, and An object of the present invention is to provide an integrated distributor / matcher having excellent transmission characteristics over a wide band for a signal.

[0005]

In order to solve the above-mentioned problems, the present invention is directed to a distribution system which is formed at a central portion of a core member and divides an input signal from an input terminal side into a plurality of equal parts and outputs the signals to respective distribution terminal sides. A transformer, formed around the core member,
Then the distribution terminal side of each of the distribution transformer
One continuous winding, the output terminal of the winding and the electrical
Formed from another winding with electrically connected terminals
Is, a distributor of the distributing and aligning integrated composed of matching transformers for converting impedance, the core member and the core body drilled a hole in the central portion is fitted into the hole of the core body And another auxiliary core disposed in the same manner.

[0006]

The core member comprises a core body having a hole formed in the center and another auxiliary core which is disposed so as to fit in the hole of the core body. As described above, the core member is configured by combining the two bodies of the core body and the auxiliary core. A distribution transformer is formed at the center of the core member, and a matching transformer is formed at the periphery of the distribution transformer.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to specific embodiments. FIG. 1 shows a two-divider 10 according to the present invention.
0 is a plan view, and FIG. 2 is a rear view of FIG.
FIG. 3 shows a core member 1 constituting the two distributor 100 of FIG.
3A shows one core body, FIG. 3A is a plan view, and FIG.
FIG. 3B is a longitudinal sectional view of FIG. FIG. 4 shows an auxiliary core 12 fitted to the center of the core body 11 of FIG.
4 (A) is a plan view and FIG. 4 (B) is a longitudinal sectional view of FIG. 4 (A). FIG. 5 shows a connection diagram of a two-distribution transformer and one of two matching transformers constituting the two-divider 100 of FIG. 1, and FIG. 5A shows a connection diagram of the two-distribution transformer. FIG. 5 (B) is a connection diagram of the matching transformer. Incidentally, the matching transformer is constituted by a single-turn transformer. Hereinafter, in the matching transformer, a winding between the input terminal side and the output terminal side is referred to as a series winding, and a winding between the output terminal side and the ground terminal side is referred to as a common winding. The winding ratio is described as the ratio between the series winding and the common winding. Also, in the figure
1t and 3t indicate that the number of turns (number of turns) of the winding is 1 and 3, respectively. Hereinafter, components having the same configuration are denoted by the same reference numerals, and redundant description is omitted.

[0008] 2 distributor 100 is two distribution transformers DT, respectively matching transformer AT 1 to the left and right is a peripheral _unit, AT ₂ is distributor of the distributing and aligning integral formed in a central portion of the core member 10. The second distribution transformer DT, two winding number 1 of windings W _11, W ₁₂ is wound, the two windings W _11, one terminal of the W ₁₂ is crowded securely twisted to fill the core member 10 Input Terminal IN is pulled out. And the above 2
The other terminals of the two windings W ₁₁ and W ₁₂ are respectively connected to distribution terminals D
_1, and D _2. Further, the matching transformer AT _1, AT _2, common windings W ₂₂ of the series winding W ₂₁ and the winding number 3 of the winding number 1 is wound. The one terminal of the series winding W ₂₁ is the input terminal I _1, I _2, its input terminal I _1, I ₂ and the distribution terminal D _1, D ₂ and are connected respectively. In practice, the windings W ₁₁ and W ₁₂ and the series windings W ₂₁ are continuously connected to the core member 10.
It is wound in the hole described later. And matching transformer AT
_1, AT ₂ from the one terminal of the other terminal of the series winding W ₂₁ and the common winding W ₂₂ is connected to output terminals O
UT1 and OUT2 are extracted. Furthermore, the other terminal of the common winding W ₂₂ is led out as an earth terminal E _1, E _2, respectively. The two distributor 100 above the impedance matching between the series winding W ₂₁ winding ratio of 1: 3 by the input terminal IN and the output terminal OUT1, OUT2 of the common winding W ₂₂ is achieved.

The core member 10 of the above-described two-way distributor 100 includes:
It comprises a core main body 11 and another auxiliary core 12 which is fitted in the center of the core main body and disposed integrally therewith. Core body 1
1, as shown in FIG. 3, each of the holes 11a and the peripheral portion to the central portion and the two holes H ₁₂ are opened. or,
The auxiliary core 12 has a cylindrical shape as shown in FIG.
It is formed to have a fitting dimension with respect to a. When the auxiliary core 12 is disposed so as to be fitted into the hole 11a of the core body 11, a hole H at a peripheral portion of the core body 11 is provided.
₁₂ and hole position are two holes H ₂₁ drilled so that a straight line.

Thus, the core member 1 of the two-way distributor 100
The thickness of the core main body 11 and the thickness of the core main body 1
Auxiliary core 1 fitted and fitted in hole 11a at the center of
2 thickness. That is, the thickness of the central portion of the core member 10 can be set regardless of the thickness of the peripheral portion of the core body 11. That is, the thickness relationship between the central portion and the peripheral portion of the core member 10 of the two-way distributor 100 is improved so that transmission characteristics are mainly improved without being affected by the manufacturing process of the core body 11 and the like as described above. It can be set. Therefore, the distribution / matching-integrated two-way splitter 100 using such a core member 10 has excellent transmission characteristics over a wide band with respect to a high-frequency signal. The core member 10 has a different magnetic permeability between the core body 11 and the auxiliary core 12.
By changing the thickness described above,
Transmission characteristics can be improved.

FIG. 6 shows another core member 20 which constitutes the distributor according to the present invention. FIG. 6 (A) is a plan view and FIG. 6 (B) is a bottom view. One core body 21 constituting the core member 20 has a hole 2 in which the auxiliary core 22 is fitted and disposed at the center.
1a, and the width at the center is wider than the width at the periphery. The auxiliary core 22 of the core member 20 is formed in the same manner as in FIG.

The thickness of the central portion of the core member 20 thus configured can be set irrespective of the thickness of the peripheral portion of the core body 21, as in the above-described embodiment. Similarly to the above-described auxiliary core 12, the auxiliary core 22 is
1 is fitted and arranged in the central hole 21a. Therefore,
An integrated distributor / matching two-way distributor using the core member 20 whose thickness and width are appropriately selected has excellent transmission characteristics over a wide band with respect to a high-frequency signal.

FIG. 7 shows a core member 30 when the distributor of the present invention is a three-part distributor. FIG. 7A is a plan view, and FIG.
(B) is a bottom view. The core body 31 has a cylindrical shape,
The auxiliary core 32 is formed with a hole 31a in the center thereof in which the auxiliary core 32 is fitted. The auxiliary core 32 has a cylindrical shape, and its outer peripheral side surface has a hole 3 at the center of the core body 31.
1a is formed to have a fitting dimension. The thickness of the central portion of the core member 30 configured as described above can be set irrespective of the thickness of the peripheral portion of the core body 31 as in the above-described embodiment. Further, similarly to the above-described auxiliary core 12, the auxiliary core 32 is disposed so as to fit into the hole 31a at the center of the core body 31. Therefore, the distribution / matching integrated three-way distributor using such a core member 30 is as follows.
It has excellent transmission characteristics over a wide band with respect to a high frequency signal.

[0014]

According to the present invention, the core member comprises a core body having a hole formed in the center and another auxiliary core which is disposed so as to fit into the hole of the core body. The thickness of the central part and the peripheral part of the core member, and furthermore, the magnetic permeability can be freely set without being restricted by the above. The distribution / matching integrated type distributor using such a core member is capable of appropriately selecting the thickness or the magnetic permeability of the core member with emphasis on transmission characteristics, and is excellent in a wide band for high frequency signals. It has transmission characteristics.

[Brief description of the drawings]

FIG. 1 is a plan view showing a two-way distributor, which is a distributor according to a specific embodiment of the present invention.

FIG. 2 is a rear view of FIG.

FIG. 3 is a view showing a core body forming a core member constituting the two distributor according to the embodiment.

FIG. 4 is a view showing an auxiliary core that is fitted and disposed at the center of the core body of FIG. 3;

FIG. 5 is a connection diagram of a two-distribution transformer and one matching transformer of the two matching transformers forming the two-divider according to the embodiment.

FIG. 6 is a view showing a second embodiment of a core member constituting a two-way distributor according to the present invention.

FIG. 7 is a view showing a core member constituting a three-way distributor according to the present invention.

[Explanation of symbols]

10-Core member 11-Core body 11a-Hole
12 auxiliary core DT-2 distribution transformer W _11, W ₁₂ - winding IN-
Input terminals D _1, D ₂ - distribution terminal AT _1, AT ₂ - matching transformer W ₂₁ - series winding W ₂₂ - common winding I _1, I ₂ - input terminal OUT1, OUT2- output terminals E _1, E ₂ - Ground terminal 100-2 distributor

Claims (1)

(57) [Claims] 1. A distribution transformer formed at a central portion of a core member, for equally dividing a plurality of input signals from an input terminal side and outputting the divided signals to respective distribution terminal sides, and the distribution transformer formed at a peripheral portion of the core member. then each of the distribution terminal side of
One continuous winding and the output terminal of the winding
Formed with another winding having terminals connected to it
And a matching transformer for converting impedance, wherein the core member is fitted into the core body having a hole in the center and the hole in the core body. And a separate auxiliary core disposed in the distributor.