JP2002141147A - Circuit board arranging structure and power supply inserter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply inserter capable of decreasing loss in connecting each terminal to a board circuit pattern and transmission loss of a circuit board, and minimizing the size of the board itself. SOLUTION: An input terminal 2 and an output terminal 3 formed as coaxial cable connecting terminals are disposed on the same side surface of a housing 1, and a power supply terminal 4 is disposed on the facing side surface. The back face of the circuit board 5 is adhered to the inside surface of the housing 1 having the input terminal 2 and the output terminal 3, and central conductors 2a and 3a of terminals 2 and 3 are penetrated through the circuit board 5 and connected to the circuit pattern 5a formed in the circuit board surface. The circuit pattern 5a of the circuit board 5 is connected to the power supply terminal 4 by wiring a coil 7 in air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply for use in supplying power through a signal transmission line when supplying power to an amplifier for amplifying a signal received from a satellite receiving antenna, for example. In particular, the present invention relates to an improvement in the circuit board arrangement of the power inserter.

[0002]

2. Description of the Related Art When a device such as an amplifier or a down converter is interposed in a signal transmission line for transmitting a signal from a satellite receiving antenna, a method of supplying power to the device is to use a signal transmission line near a receiving end. There is a method in which a power supply inserter is interposed and power is supplied from the power supply inserter via a signal transmission path. The power supply inserter used at this time has a circuit shown in FIG. 5, in which a signal input terminal 10, an output terminal 11 and a power supply terminal 12 for introducing a power supply are composed of three capacitors C1, C2, C3 and a coil L1. Connected and configured. As shown in the internal view of the housing in FIG. 6, each terminal is formed as a plug seat for connecting a coaxial cable.
Are arranged, and the center conductor of each terminal is connected to each circuit pattern on the substrate 9 by soldering.

[0003]

However, in the case of the above construction, the board 9 is filled to the inside of the housing to minimize the loss at the connection point between the center conductor of each of the connection terminals 10, 11, 12 and the board 9. Had been placed. for that reason,
The substrate 9 had to be made unnecessarily larger than the number of elements to be mounted, which was costly. Further, it was not possible to eliminate the gap between the connecting portions, and a relatively large passage loss occurred. Further, since the back surface of the substrate was not used and the substrate was a single-sided substrate, transmission loss was large. R1 and R2 are resistors having a resistance value of zero provided to make the entire ground pattern of the substrate 9 the same potential. When a ground pattern is formed on the back surface of the substrate, providing such a through-hole eliminates the need for such a resistor, but increases the cost.

In view of the above problems, the present invention reduces the loss when connecting each terminal to the board circuit pattern, reduces the transmission loss of the circuit board, and further reduces the size of the circuit board. It is an object to provide a power inserter.

[0005]

According to a first aspect of the present invention, a signal circuit is formed by connecting a center conductor of a coaxial cable connection terminal in a housing having the coaxial cable connection terminal. A circuit board arrangement structure for arranging a circuit board, wherein an inner wall of a housing having the coaxial cable connection terminal is formed flat, and an insertion groove for inserting a center conductor protruding from the inner wall of the housing is provided in the circuit board. The back surface is arranged so as to be in close contact with the inner wall of the housing, and the center conductor is inserted from the back surface of the circuit board and connected to a circuit pattern formed on the surface of the circuit board.

According to a second aspect of the present invention, in the first aspect of the present invention, a strip line structure can be formed between a circuit pattern formed on a circuit board and the inner wall of the housing.

According to a third aspect of the present invention, in the first or second aspect of the present invention, a strip line structure is formed between a circuit pattern formed on the circuit board and a flat portion of the housing to which the circuit board is closely attached as a ground plane. It is characterized by.

According to a fourth aspect of the present invention, an input terminal, an output terminal,
And a power supply terminal, the power supply inserter capable of transmitting power introduced from the power supply terminal from the input terminal, wherein the input terminal and the output terminal are provided on the same plane portion of a power supply inserter housing, and a circuit board is provided. The input terminal and the output terminal are connected to a circuit pattern formed on the surface of the circuit board, the back surface being arranged so as to be in close contact with the inner surface of the same plane portion of the housing.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, a strip line structure is formed between a circuit pattern formed on the circuit board and a flat portion of the housing to which the circuit board is in close contact as a ground plane. And

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory view showing the inside of a housing showing an example of a power supply inserter according to the present invention.
And an input terminal 2 to which a signal of, for example, 1 GHz is transmitted and input to one side surface of the main body 1a and an output terminal 3 which outputs the signal are formed as an F-type plug seat for connecting a coaxial cable, and are opposed to each other. A power supply terminal 4 for introducing a power supply is similarly formed as an F-type plug seat for connecting a coaxial cable on the side surface.

Reference numeral 5 denotes a circuit board, on which a circuit pattern is formed on the surface of the resin-made insulating substrate by, for example, a printing conductive thin film. Insertion grooves 5b, 5b through which the center conductors 2a, 3a are inserted.
Further, cuts 5c, 5c are provided for engaging with holding pieces 6, 6 projecting from the bottom of the housing. Holding piece 6
As shown in the side view of FIG. 2, the front end is formed in an L-shape so as to protrude upward substantially in parallel with the wall surface of the housing 1.
The substrate 5 is formed so as to be engaged with the notch 5c of the substrate 5 to sandwich the substrate 5 and to closely hold the substrate 5 on the housing wall surface. The inner wall surface of the side surface of the housing having the input terminals 2 and the output terminals 3 is formed with a flat surface so that the substrate can easily adhere to the entire back surface.

A predetermined portion of the circuit pattern 5a and the center conductor of the power supply terminal 4 are connected by wiring a coil 7 (L1) in the air, and there is a gap between the center conductor of the power supply terminal 4 and the grounded housing 1. Lead type capacitors 8a (C1), 8b
(C2) is connected, and the ground pattern formed on the substrate 5 is also connected by soldering to the housing 1 via the holding piece 6 to form the circuit shown in FIG.

A method of assembling the substrate 5 will be described.
The circuit board 5 on which the capacitor 8c (C3) is mounted is connected to the input terminal 2 and the output terminal 3
Then, the required portion is connected by soldering or the like, and the coil 7 is connected between the substrate 5 and the power supply terminal 4. The center conductor 2 of the input terminal 2 and the output terminal 3 protruding by the sliding operation of the substrate 5
The a and 3a are inserted through the insertion grooves 5b and 5b, and subsequently, the notches 5c and 5c hold the holding pieces 6 and 6, and the holding piece 6 holds the substrate 5 therebetween. By the holding action of the holding piece 6, the back surface of the substrate is brought into close contact with the housing. After the substrate is clamped, each of the center conductors 2a and 3a and the circuit pattern, and the holding piece 6 and the ground pattern may be connected by soldering or the like.

FIG. 3 shows a comparison between the characteristics of the power supply inserter thus formed and the conventional power supply inserter of FIG. 6. As shown in FIG. 3, the return loss and the inter-terminal rejection amount do not change, but the passage loss is improved. You can see that it is. These numerical values show the worst values among the characteristics between 5 and 2600 MHz.

As described above, by arranging the circuit board in close contact with the side surface on which the signal terminal is provided, instead of the bottom surface of the housing, and connecting the input terminal and the output terminal, it is not necessary to extend the circuit board to the power supply terminal. it can. In addition, the connection between the center conductor of the connection terminal and the circuit pattern of the circuit board can be performed in close proximity since the circuit board is inserted from the back surface and connected on the front surface, thereby minimizing the loss at the connection portion. And the passage loss characteristics can be improved. Further, since the circuit board is pressed and adhered to the housing by the holding piece, even if the single-sided board is provided with a conductor pattern on only one side, if the housing is an earth conductor, it has a function as a strip line structure between the board and the circuit pattern. Can be easily implemented, and the transmission loss characteristics can be improved at low cost. The circuit board is not a single-sided board, and the circuit pattern may have a strip line structure with the back surface covered with a conductive film.

FIG. 4 shows another embodiment of the power supply inserter of the present invention. The arrangement of elements is changed from that of the above embodiment, and the coil 7 and the capacitors 8a and 8b are mounted on the circuit board 5. is there. The central conductor 4 a of the power terminal 4 is extended and connected directly to the circuit pattern of the circuit board 5. The elements may be arranged in this manner, whereby all the elements can be mounted on the circuit board in advance, and the assembly process can be simplified.

[0017]

As described above in detail, according to the first aspect of the present invention, since the center conductor of the coaxial cable is inserted from the back surface of the circuit board and connected to the circuit pattern on the front surface, the terminals are close to the circuit board. Connection, and the loss at the connection between the connection terminal and the circuit board can be reduced.

According to the invention of claim 2, in addition to the effect of claim 1, even if the circuit board is a single-sided board, the transmission loss characteristic of the board circuit pattern can be improved. According to the third aspect of the invention, in addition to the effects of the first or second aspect, the circuit board can be easily adhered and fixed to the housing, and the strip line structure can be easily formed.

According to the fourth aspect of the present invention, it is not necessary to dispose the circuit board over the entire bottom surface of the housing, so that the size of the board can be reduced, and the connection between the connection terminals and the board circuit pattern can be performed in close proximity. The loss at the connection can be improved. According to the fifth aspect of the present invention, in addition to the effect of the fourth aspect, the transmission loss characteristics of the substrate circuit pattern can be improved even with a single-sided substrate.

[Brief description of the drawings]

FIG. 1 is an internal explanatory view of a power supply inserter according to the present invention,
1 shows an example of a circuit board arrangement structure.

FIG. 2 is an explanatory side view of a holding piece formed on a housing of FIG. 1;

FIG. 3 is a table showing comparative characteristics of the power inserter of FIG. 1 and a conventional power inserter.

FIG. 4 is a view showing another example of the power inserter according to the present invention, and is an explanatory view of the inside of a housing showing another circuit pattern and element arrangement formed on a circuit board.

FIG. 5 is a circuit diagram of a power supply inserter.

FIG. 6 is an explanatory diagram showing the inside of a housing of a conventional power supply inserter.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Housing, 1a housing main body, 2 ... input terminal, 2a ... center conductor, 3 ... output terminal, 3a ... center conductor, 4 ... power supply terminal, 5 ... circuit board, 5a ... circuit Pattern, 5b, insertion groove, 5c, notch, 6
-Holding pieces.

Claims (5)

[Claims] 1. A circuit board arrangement structure for arranging a circuit board for forming a signal circuit by connecting a center conductor of the coaxial cable connection terminal in a housing having the coaxial cable connection terminal, wherein the coaxial cable connection terminal is provided. With the housing inner wall having a flat, the circuit board is provided with an insertion groove for inserting the center conductor protruding from the housing inner wall,
A circuit board arrangement structure, wherein the back surface of the circuit board is disposed in close contact with the inner wall of the housing, and the center conductor is inserted from the back surface of the circuit board and connected to a circuit pattern formed on the surface of the circuit board. 2. The circuit board arrangement structure according to claim 1, wherein a strip line structure can be formed between the circuit pattern formed on the circuit board and the inner wall of the housing. 3. The circuit board arrangement structure according to claim 1, wherein a strip line structure is formed between the housing and the circuit board in close contact with a circuit pattern formed on the circuit board, using a flat surface of the housing as a ground plane. 4. A power inserter having an input terminal, an output terminal, and a power terminal, wherein power introduced from the power terminal can be transmitted from the input terminal, wherein the input terminal and the output terminal are connected to a power inserter housing. And the circuit board is disposed such that the back surface thereof is in close contact with the inner surface of the same plane portion of the housing, and the input terminal and the output terminal are connected to a circuit pattern formed on the surface of the circuit board. A power inserter, characterized in that: 5. The power supply inserter according to claim 4, wherein the power supply inserter has a strip line structure between a flat portion of the housing to which the circuit board is in close contact and a circuit pattern formed on the circuit board as a ground plane.