JPH064604Y2 - Filter mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a mounting structure of a filter on a printed circuit board.

[Conventional technology]

Generally, a high frequency filter of a printed circuit board mounting type is used after being attached to a printed circuit board and then electrically connected to a transmission line such as a strip line. Conventionally, this type of filter has been proposed in a plurality of different shapes,
Therefore, when mounting these different filters on a printed circuit board, it is necessary to provide printed circuit boards having different terminal positions of the transmission line so that the connection positions of the filters with the terminals are matched. Further, in order to unify the number of printed circuit boards into one, each manufacturer has attempted to unify the standards such as the shape of filters and the pitch of signal terminals.

[Problems to be solved by the device]

In the above-described conventional filter, the standards are not yet unified among different manufacturers. Therefore, when using filters of a plurality of manufacturers with the same shape and the same signal terminal pitch, when trying to match the shape with one manufacturer, There is a problem in that the structure of the filter of another manufacturer is unreasonable and the cost becomes high. Therefore, there is a problem that it is difficult to obtain the filter.

Also, when filters with different pitches are connected on the same printed circuit board at different positions of the pattern such as transmission line, the pattern due to the difference in pitch is connected to one of the filters, and the impedance of the line is It will be in a state of mismatch with the impedance of the filter,
There is a problem that the required filter characteristics cannot be obtained.

An object of the present invention is to provide a filter mounting structure capable of mounting filters with different pitches on the same printed circuit board.

[Means for Solving the Problems]

The filter mounting structure of the present invention has the input side and output side transmission lines each having a signal terminal matched with a filter having one pitch size, and the signal input terminals having a signal terminal matched with a filter having another pitch size. Alternatively, a pitch difference connection line disposed close to one transmission line on the output side can be provided, and this one transmission line and the pitch difference connection line can be electrically connected by a high-frequency short-circuit element mounted between them. Is configured.

[Action]

In the above-mentioned configuration, in the case of a filter with a long pitch, electrical connection is made to each transmission line, and in the case of a filter with a short pitch, one transmission line is connected to the pitch difference connection line with a short-circuit element. Enables mounting on a board.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

FIG. 1 is a plan view of a printed circuit board according to an embodiment of the present invention.
In the figure, 1 is an input side strip line, 2 is an output side strip line, and each strip line 1, 2
A filter is connected between the signal terminals 3 and 4 provided in the. And, on the output side strip line 2,
The pitch difference connection strip line 5 is formed so as to be separated by a minute dimension toward the input side, and the signal terminal 6 is provided at the input side end position of the pitch difference connection strip line 5.

Consider a case where two filters of different manufacturers, in other words, filters 7 or 8 having different pitches are mounted in this configuration. When the longer filter 7 is mounted, the filter 7 is attached to the signal terminal 3 on the input side as shown by the broken line in the figure.
The input side terminals of are combined and the output side terminal thereof is connected to the signal terminal 4. At this time, the pitch difference connection strip line 5 is unnecessary.

On the other hand, when the shorter filter 8 is mounted, the input side terminal of the filter 8 is aligned with the input side signal terminal 3 as shown by the chain line in the figure, but here the output side terminal is provided on the pitch difference connection strip line 5. Connected to the signal terminal 6. Then, between the pitch-difference connection strip line 5 and the output side strip line 2, a high frequency short circuit element, for example, a capacitor having a small high frequency loss, a short circuit element 9 such as a strap resistor or a strap line, is mounted. Both strip lines 2 and 5 are connected to each other at 9.

Therefore, by adopting such a connection structure, the pitch difference connection strip line 5 is not connected to the signal terminal 4 when the long filter 7 is connected,
It does not affect the filter 7 such as impedance mismatch. Further, when the filter 8 is used, by mounting the short-circuit element 9, the filter 8 is connected to the output side strip line 2 via the signal terminal 6 and the pitch difference connection strip line 5. As a result, it is possible to mount filters of different pitches from each manufacturer on the same printed circuit board, and it is possible to achieve cost reduction.

[Effect of device]

As described above, the present invention is provided with pitch difference connection lines corresponding to filters having different pitches, and the pitch difference connection line is connected to one transmission line with a short-circuit element. Especially in the case of a filter with a short pitch, it is possible to mount it on the board by connecting one transmission line to the line for pitch difference connection with a short-circuit element, which allows filters of different pitches from different manufacturers to be mounted on the same purine board. Therefore, there is an effect that the problem of availability of the filter is eliminated and the cost can be reduced.

[Brief description of drawings]

The drawing is a plan view of an embodiment of the present invention. 1 ... Input side strip line, 2 ... Output side strip line, 3, 4 ... Signal terminal, 5 ... Pitch difference connection strip line, 6 ... Signal terminal, 7, 8 ... Filter, 9 ... Short-circuit element.

Claims (1)

[Scope of utility model registration request] 1. An input-side or output-side transmission line having signal terminals matched with a filter of one pitch dimension, and signal terminals matched with a filter of another pitch dimension, said input side or output side. One of the transmission lines is provided in proximity to the pitch difference connection line, and the one transmission line and the pitch difference connection line are configured to be electrically connectable by a high frequency short-circuit element. Filter mounting structure.