JPS62269502A - Manufacture of strip line - Google Patents

Abstract

PURPOSE:To attain electrically stable line structure by forming a required conductor pattern to upper/lower faces of a printed circuit board so as to decrease warp or deformation of the board. CONSTITUTION:A ground conductor face only having the same width as a board width to be cut shown in single dot chains is left as a ground conductor 4 in the ground conductor face of a strip line on a rear side of the board 3 and the other conductor parts are removed by etching as the printed pattern circuit board. In applying reflow soldering to the rear side of the board, soldering is applied only to the part 4 where the conductor pattern reamins. The board with a carrier is cut off along a mark (single dot chains) on the board upper face to form a strip line where only the required part of board width is obtained. Since the ratio of areas of the upper/lower conductor parts of the board is decreased, the distortion of the board is made less. Further, the potential of the ground conductor face is made equal in terms of high frequencies.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a strip line as a transmission line in a high frequency circuit.

[Conventional technology]

Conventionally, a strip line with a limited board width of the IJ knob line has been used as a structure for suppressing the generation of higher-order modes as a strip line structure, and this structure has a structure to suppress the generation of higher-order modes. There are methods such as making a groove in the case with the same width as the ground conductor width and housing the strip line itself in the case, or making a groove in the top cover and covering the strip line board.

[Problem to be solved by the invention] When a strip line is constructed using a substrate such as wire, the double-sided copper-clad substrate may warp or deform due to the imbalance of tension in the conductor metal foil, such as copper foil. Usually, a reinforcing carrier is attached to the ground conductor surface.

When the board is cut to a predetermined width in order to be attached to this carrier, even more severe warping and deformation appear, resulting in insufficient soldering and poor adhesion between the printed circuit board and the carrier, resulting in partial contact between the carrier and the ground conductor surface of the board. This tends to leave gaps. In addition, due to deformation etc., the l-I
There is a drawback that the J Tsubu line is not located, especially! At high frequencies such as the microwave band, m is a cause of deterioration.

[Means to solve the problem]

In order to solve the above problem, the present invention has a structure in which only the ground conductor surface of the strip line with the same width as the width of the board to be cut is left as a ground conductor, and other conductor parts are removed by etching etc. Make it into a printed pattern board.

Furthermore, if the back side of this printed circuit board is soldered using a refill port or the like, only the portion where the conductor pattern remains will be soldered. By cutting the substrate with this carrier attached along the marks on the top surface of the substrate, it is possible to create a strip line with limited substrate width only in the necessary portion.

[For production]

If the above structure is an IJ tube line, the area ratio of the upper and lower conductor portions of the board can be reduced, so the distortion due to the difference in tension between the upper and lower boards can be reduced. Therefore, since the necessary conductor portions on the back surface are uniformly soldered, the ground conductor surface potential can be made equal to the potential at high frequencies. Therefore, discontinuity in characteristic impedance is reduced, and a good strip line can be obtained. In addition, since there is no deformation of the board, the strip line can be attached at a predetermined position, and the position of the connector at the input/output end can be accurately aligned with the position of the center conductor of the strip line.

〔Example〕

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings showing examples.

1 and 2 show one embodiment of the present invention. FIG. 1 is a pattern diagram of the component mounting surface, and FIG. 2 is a pattern diagram of the back surface. In Figure 1, 1. is the conductor pattern of the subl-'J tube line, 2. is a mark for cutting the board width, 3. is the substrate base material. 4 in Figure 2. The hatched part is a pattern diagram of a ground conductor. FIG. 3 is a drawing in which the circuit board having the pattern shown in FIGS. 1 and 2 is soldered to a reinforcing carrier with a rift opening, and 5. is this reinforcing carrier. In Figure 3, after a printed circuit board with a strip line pattern is soldered to the carrier using the rift opening,
The board width limited type strip line shown in FIG. 4 is a diagram cut with a cutter or the like along the dashed line along the marks .

〔Effect of the invention〕

As described above, by creating the necessary conductor patterns on the top and bottom surfaces of the printed circuit board, it is possible to reduce warping, deformation, etc. of the printed circuit board, making it possible to create an electrically stable slug-IJ tube line structure.

[Brief explanation of drawings]

Fig. 1 is a pattern of the mounting surface according to the present invention. Fig. 2 is a pattern of the back side according to the present invention. Fig. 3 is a structural diagram of the board attached to the reinforcing carrier. Fig. 4 is an unnecessary portion after the board is attached to the reinforcing carrier. FIG. 2 is a structural diagram of a substrate width-limited strip line cut away. 1, Conductor pattern diagram 2, Board width cutting mark 3, Board base material 4, Back ground conductor pattern diagram 5, Board reinforcement carrier, Figure 1, Figure 2 3. 5.4°

Claims (1)

[Claims] (1) In a method for manufacturing a strip line with a limited board width structure, a pattern with the same shape as the required part is created on the back side of the printed circuit board as a ground conductor by cutting the printed circuit board, and then the printed board is reinforced on the back side. 1. A method for manufacturing a strip line, which comprises mounting the printed circuit board on a carrier, and then cutting the printed circuit board along the pattern on the back side.