JPH0136323Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a phase adjustment circuit for a transmission line using a microwave strip line.

(Prior Art) In a power distribution circuit used for feeding a phased array antenna or a power combining circuit of a microwave power amplifier, it is necessary to accurately adjust the phase of the feeding end. Conventionally, when a strip line is used in this type of circuit, adjustment of the insertion phase requires the first step of actually measuring the insertion phase of the transmission line and remanufacturing it by changing the line length by an amount corresponding to the amount of phase to be corrected.
The second method was to convert the stop line to a coaxial line and adjust the line length.

An example of the first method is shown in FIG. FIG. 1 shows a part of the power distribution circuit, in which a strip line 1 forming the main transmission line, a branch circuit 2, and a strip line 3 forming the sub transmission line are formed on a dielectric substrate 5. There is. In FIG. 1, other components constituting the transmission line, such as a ground conductor and a dielectric, are omitted, and only the strip line is shown. Power input to the strip line 1 is divided into two by a branch circuit 2 to first and second output ends 6 and 7. Here, in order to adjust the phase difference at the first and second output ends 6, 7, the strip line 41 is extended like the strip lines 42, 43 to change the line length, and the strip line is remanufactured. I have been implementing it since then.

On the other hand, an example of the second method is shown in FIG.
In the second method, the strip line 41 part in the first method is removed, the transmission line using the strip line is converted to a coaxial transmission line via a converter 8, and the structure is connected by a coaxial transmission line 9. It's getting old. Therefore, in the second method, the line length of the coaxial transmission line 9 is changed to adjust the phase.

The above adjustment has the disadvantage that the line must be remanufactured each time the strip line or coaxial line is adjusted, and furthermore, fine adjustment is difficult. Furthermore, when a transmission line having a variable line length structure is used as the coaxial transmission line 9, the structure becomes large and complicated, and there are also disadvantages of increased insertion loss.

(Purpose of the invention) The purpose of the invention is to divide a part of the strip line, provide a second circular dielectric substrate,
A pattern is formed such that one end of the connection part is located at the center of the circle and the other connection parts are arranged on the circumference of the circle. By adopting a structure in which the circular dielectric substrate described above can be rotated and fixed, microwave transmission using strip lines is possible without the need for remanufacturing for each adjustment, and with almost no deterioration of impedance matching or increase in insertion loss. An object of the present invention is to provide a simple phase adjustment circuit that can finely adjust the phase of a path.

(Structure of the invention) The invention is constructed by contacting a circular dielectric substrate with a rectangular dielectric substrate.

The rectangular dielectric substrate has first and third lines separated from each other formed on the same surface.

a circular dielectric substrate has a third line disposed on its surface, one end of the first line and the third line are overlapped and connected at one point by mechanical contact;
A strip line pattern is formed on the surface so that the other ends of the second line and the third line are connected to each other by mechanical contact on a circumference centered on the one point.

In the present invention, the effective length of the third line is adjusted by rotating the position of the circular dielectric substrate and changing the connection point, and then fixed, so that the total line length of the strip line can be adjusted. It is composed of

(Example) Next, the present invention will be described in detail with reference to the drawings.

FIG. 3 is a diagram showing the basic configuration of the phase adjustment circuit according to the present invention. In Figure 3, 3,3
1, 10 and 12 are strip lines, 5 is a rectangular dielectric substrate, 7 is an output end, 11 is a circular dielectric substrate, and 13 and 14 are connection parts.

4 to 6 are diagrams showing the phase adjustment circuit shown in FIG. 3 divided, and FIG. 4 is a layout diagram of the rectangular dielectric substrate 5, and FIG. 5 is a layout diagram of the circular dielectric substrate 11. The layout diagram, FIG. 6, is a sectional view of the circular dielectric substrate 11 shown in FIG.

As shown in Figures 4 to 6, a part of the transmission line using a strip line is connected to a strip line 31.
and a strip line 10, which are formed on a rectangular dielectric substrate 5. As shown in FIGS. 5 and 6, a strip line 12 is formed on a circular dielectric substrate 11, and as shown in FIG. 3, the rectangular dielectric substrate 5 and the circular dielectric substrate 11 are brought into mechanical contact. Connecting. The strip line 31 and the strip line 12 overlap each other and are in contact with each other through a connecting portion 14, and the strip line 10 and the strip line 12 are overlapping and in contact with each other through a connecting portion 13. The connecting portion 13 is located approximately at the center of the circular dielectric substrate 11, and the overlapping portion of the connecting portion 14,
The strip line in the vicinity is formed so as to be located on the circumference of a circle centered approximately on the center point of the connecting portion 13. Therefore, the circular dielectric substrate 11 is rotated about the center point of the connection part 13 and fixed after the phase adjustment is completed, so that the width of the connection part 14 is maintained constant while the width of the strip line is kept constant. Since the line length of the overlapping portion can be effectively changed, a phase adjustment circuit that can finely adjust the line length can be obtained.

In FIG. 3, the strip line 10 and the output end 7 are formed at right angles to the strip line 3, but there is no particular need to form them at right angles. Furthermore, although the widths of the lines are drawn differently, they are arbitrarily determined depending on the characteristic impedance of the line.

Next, a first embodiment of the present invention will be described with reference to FIGS. 7 and 8. Figure 7 shows the phase adjustment circuit of the present invention implemented in a triplate configuration on one output side of a power divider with a triplate configuration, and Figure 8 is a cross-sectional view taken along line A-A' in Figure 7. It is. In FIG. 7 and FIG. 8, 1 to
3, 31, 5 to 7, and 10 to 14 indicate elements similar to those shown in FIGS. 1 to 6. Further, 51 is a dielectric substrate, 151 to 153, 16 is a ground conductor, and 18 is a dielectric substrate.
is a screw. Strip line 1 forming the main transmission line
The input power is branched into two by the branch circuit 2, one branched to the output terminal 6, and the other branched from the sub-transmission line 3 to the output terminal 7 via the phase adjustment circuit formed on the circular dielectric substrate 11. distributed to. Main transmission line 1, branch circuit 2, sub transmission line 3, strip line 3
1 and the strip line 10 are formed on a rectangular dielectric substrate 5 by etching. In addition, in the figure, a ground conductor 151 is inserted on the outside, a dielectric 51 and a ground conductor 152 are inserted on the inside, and further, a part of the dielectric substrate 51 and the ground conductor 152 is removed in a circular shape, and a circular dielectric is inserted therein. A body substrate 11 is arranged. A strip line 12 is installed in the circular hollow part.
is formed by etching, and a circular dielectric substrate 11 with a ground conductor 16 pasted on the opposite side is fitted. This circular dielectric substrate 11 is fixed to the rectangular dielectric substrate 5 by screws 18 using a part of the ground conductor 16 to form a triplate configuration. In this embodiment, by loosening the screw 18, the phase of the output end 7 can be finely adjusted by rotating and changing the position of the circular dielectric substrate 11.

A second embodiment of the present invention is shown in FIGS. 9 and 1.
Shown in Figure 0. In the embodiment shown in FIG. 9, a power divider having the same function as the first embodiment is realized using a microstrip circuit.

In both of the above embodiments, a scale 17 is added to facilitate adjustment. In addition, the circular dielectric substrate 11
may be fixed by gluing after adjustment instead of using screws.

(Effects of the invention) As explained above, the present invention divides a part of the strip line, includes a second circular dielectric substrate, and mechanically connects the strip line formed on the second circular dielectric substrate. The connection is made by contact, one end of the connection part is located at the center of the circle, and the other connection parts are arranged on the circumference of the circle, forming a pattern so that the circular dielectric substrate can be rotated and fixed. This configuration has the advantage that the line length can be varied with almost no deterioration in impedance matching or increase in insertion loss, and the phase can be finely adjusted without remanufacturing the strip line.

[Brief explanation of the drawing]

1 and 2 are layout diagrams showing an example of a phase adjustment circuit according to the prior art. FIG. 3 is a layout diagram showing the principle of construction of the phase adjustment circuit according to the present invention. 4 to 6 are structural diagrams showing the phase adjustment circuit shown in FIG. 3 in an exploded manner. 7 and 8 are layout structural diagrams showing a first embodiment of the phase adjustment circuit according to the present invention. 9 and 10 are layout structural diagrams showing a second embodiment of the phase adjustment circuit according to the present invention. 1, 3, 31, 41-43, 10, 12... Strip line, 2... Branch circuit, 5, 11, 51
... Dielectric substrate, 6, 7 ... Output end, 8 ... Converter, 9 ... Coaxial transmission line, 13, 14 ... Connection part,
151-153, 16...Ground conductor, 17...Scale, 18...Screw.

Claims (1)

[Scope of utility model registration request] A rectangular dielectric substrate on which first and second lines separated from each other are formed on the same surface, and a third line are arranged,
One end of the first line and the third line are overlapped and connected by mechanical contact at one point, and the other ends of the second line and the third line are on a circumference centered on the one point. a circular dielectric substrate having on its surface a pattern of strip lines formed so as to overlap and connect by mechanical contact, and the position of the circular dielectric substrate is rotated to determine the points to be connected. Adjusting the effective length of the third line by changing it and then fixing it,
A phase adjustment circuit characterized in that the total line length of the strip line can be adjusted.