JPH04287404A - microwave circuit - Google Patents

Abstract

PURPOSE:To realize the microwave circuit the size of which does not call for forming its pattern again and in which the size of the circuit pattern and the component mount point are revised for the adjustment of the circuit characteristic with respect to the microwave circuit connecting to a main line being the microstrip line and having the circuit pattern giving an additional function such as a filter and an attenuator. CONSTITUTION:Only a pattern 2 is provided to other sub board 20 than a board 10 of a main line 1 in the microwave circuit having the circuit pattern connecting to the main line of the microstrip line and giving an additional function and the circuit pattern 2 of the sub board 20 is mounted onto the main line 1 of the sub board 20 opposite to the main line 1. Furthermore, part of the main line is cut off so that the function to be added to the main line is not lost when the circuit pattern 2 of the sub board 20 is opposite to the main line 1.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a microwave circuit.
In particular, the present invention relates to a microwave circuit having a circuit pattern that is connected to a main line composed of a microstrip line and provides additional functions such as a filter and an attenuator.

0002

2. Description of the Related Art In order to adjust a microwave circuit having a circuit pattern that provides an additional function to the main line, for example, the shape and mounting position of the so-called stub of a filter provided in parallel to the main line must be changed. However, in order to change the mounting position, the conventional method is to change the shape of the circuits (A) and (B) equipped with the given parallel stubs 2A, as shown in the structural diagram of Figure 5. Methods such as pattern cutting and connecting two parallel stubs 2A1 and 2A2 with bonding wires were used.

0003

[Problems to be Solved by the Invention] However, in the above conventional example, the extent to which changes can be made for adjustment is small, and changes can only be made within the range of a pre-patterned pattern. There was a problem in that in order to change the position, the pattern had to be created again.

Although not shown, when a microwave attenuator was needed in series with the main line, it could not be easily installed and a new resistive attenuator had to be installed. The purpose of the present invention is to provide a microwave system that is connected to the main line to provide additional functions in order to adjust circuit characteristics, and that allows the size and installation position of the circuit pattern to be changed to a large degree, eliminating the need to recreate the pattern. The purpose is to provide circuits.

[0005]

[Means for Solving the Problems] This object is to provide a substrate 10 of the main line 1 of a microstrip line without providing the circuit pattern on the substrate 10 of the main line 1, as shown in the principle diagram of FIG. This is achieved by the present invention, in which only the circuit pattern 2 that provides an additional function to the main line is provided on another sub-board 20, and the circuit pattern 2 of this sub-board 20 is mounted so as to face above the main line 1.

Furthermore, when the circuit pattern 2 of the sub-board 20 faces the main line 1, the circuit pattern 2 of the sub-board
This is achieved by the present invention, in which a part of the main line 1 is deleted so that the functions that should be added to the main line are not impaired.

[0007]

[Operation] In the present invention, the circuit pattern 2 of another sub-board 20 is mounted on the main line 1 of the microstrip line provided on the main board 10 so as to face it, so that the main line 1 has a different function. This changes the operating characteristics of the main line. At that time, the characteristics will be slightly different from the conventional case in which a filter such as the parallel stub 2A is provided directly on the substrate 10 of the main line 1, but the change in this characteristic will be
This problem can be solved by making corrections when patterning additional circuits. Also, when a circuit pattern 2 such as a filter or an attenuator is required in series with the main line 1, by deleting a part of the pattern of the main line 1 that the circuit pattern 2 of the sub-board 20 faces, the desired pattern can be created. It is possible to avoid adversely affecting the characteristics of filters and attenuators.

[0008]

Embodiment The structure of a microwave circuit according to an embodiment of the present invention is shown in FIGS. 2 to 4. In the embodiment shown in FIG. 2, a plurality of sub-boards 20 having several types of circuit patterns 2 on which mounting positions are different are prepared, and the circuits of the sub-boards 20 are placed on the board 10 of the main line 1 mounted on the casing. Lay them out so that pattern 2 is facing each other. This is an example in which the sub-board 20 is held in place by a metal plate with spring properties, so that the circuit pattern 2 that provides the optimum characteristics can be selected. In this example, the subboard 20 is positioned by a groove provided in the housing in the direction perpendicular to the main line 1, and by a stopper provided on the holding plate in the same direction as the main line 1.

The embodiment of FIG. 3 has one type of circuit pattern 2.
A sub-board 20 is prepared, and a main board 1 of the sub-board 20 is prepared.
This is an example of a structure in which the attachment position to 0 is moved along the main line 1. The embodiment shown in FIG. 4 is an example in which an attenuator is inserted in series with the main line 1, and a sub-board 20 is provided with a plurality of patterns 2 by cutting the conductor on the board surface so that the resistor underneath is exposed to the surface. The selected sub-board 20 is attached to the main board 10 by turning the selected sub-board 20 upside down and facing each other as shown in the figure, and by attaching the main line 1 facing the circuit pattern 2 of the sub-board 20.
A part of the resistive attenuator is removed so that it does not come into contact with the conductor foil of the main line 1, so that its characteristics as a resistance attenuator are not impaired.

[0010] Although not particularly shown in the drawings, even when the circuit pattern 2 of the sub-board 20 is a narrow linear conductive foil that acts as a filter, the circuit pattern 2 of the thin linear conductive foil is opposite to the circuit pattern 2 of the sub-board 20. It is also possible to insert a filter in series with the main line 1 by removing part of the wide conductor foil of the main line 1 so as not to interfere with its operation as a filter.

[0011]

[Effects of the Invention] As explained above, according to the present invention, it is possible to significantly change or adjust the circuit pattern connected to the main line of the microstrip line to provide additional functions such as a filter or an attenuator, compared to the conventional method. The effect is that it is easier to obtain.

[Brief explanation of the drawing]

[Fig. 1] A principle diagram showing the basic configuration of the microwave circuit of the present invention,

[Fig. 2] Structural diagram of a microwave circuit according to an embodiment of the present invention

FIG. 3 is a structural diagram of a microwave circuit according to another embodiment of the present invention;

FIG. 4 is a structural diagram of inserting a resistive attenuator in another embodiment of the present invention;

FIG. 5 is a structural diagram of a conventional microwave circuit with parallel stubs.

[Explanation of symbols]

1 is a main line, 2 is a circuit pattern of a sub-board, 10 is a main board, and 20 is a sub-board.

Claims (2)

[Claims] [Claim 1] Main line of microstrip line (1
) in a microwave circuit having a circuit pattern (2) that provides an additional function by being connected to the main line substrate ( 1
The circuit pattern (2) is placed on a sub-board (20) different from the circuit pattern (2).
The circuit pattern (2) of this sub-board (20) is
) are mounted so as to face each other on the main line (1). 2. The microwave circuit according to claim 1, wherein a part of the main line (1) facing the circuit pattern (2) of the sub-board (20) is removed.