JPS6282801A - Method for adjusting phase of microstrip line - Google Patents

Abstract

PURPOSE:To easily adjust the phase of a main microstrip line (MSL) by connecting both the ends of one of plural sub-MSLs vertical to the main MSL with the main MSL and cutting off the main MSL near the nodes on the side where the non-reflective terminal of the main MSL exists. CONSTITUTION:To select a sub-MSL to be connected to the main MSL, both the ends of an optional sub-MSL 14a are connected to the adjacent parts P1, P2 of the main MSL by connecting means at first. Then, a phase difference is measured at I/O terminals 21, 22 to find out a necessary phase correcting amount. The sub-MSL 14b providing the correcting amount is selected, both the ends of the sub-MSL 14b are connected to the adjacent parts Q1, Q2 of the main MSL and the sub-MSL 14a is disconnected from the parts P1, P2 of the main MSL. Since the route difference between both the connections is twice the distance between the P1 and Q1, the wavelength is divided by the distance to find out the phase difference. After completing the adjustment of the phase difference, the main MSL is cut off at points 16a, 16b near the point Q on the non-refractive terminal side opposed to the terminals 21, 22.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to a method for adjusting the phase of a microstrip line (hereinafter abbreviated as MSL).

b. Prior art FIG. 3 is a perspective view of a microstrip line to which the prior art method can be applied.

2 is a U-shaped stand SL, and 2.3 is an input/output MSL connected to MSL 1. The phase reference plane is 4. J.O.
It is placed in the position of

The phase amount is changed by changing the line length of the U-shaped MSL. For this purpose, there is a method of preparing a plurality of U-shaped MSLs with different line lengths as shown in 1a and selecting one with a desired line length, or a method of cutting the U-shaped MSL to change the line length.

Since these are small in size, they are used as built-in phase adjustment mechanisms.

C0 Problems to be Solved by the Invention In the conventional MSL phase adjustment method, the work of replacing the U-shaped MSL is unavoidable. Also U-shaped MSL
When cutting a thick U-shaped MSL, if the amount of cutting is small, it is difficult to accurately cut a thick U-shaped MSL. Furthermore, cutting itself is difficult in MSL using an alumina substrate. Therefore, it takes a lot of time to assemble and adjust.
The defective rate is also high, contributing to cost increases.

d9Means for solving the problem The above problem consists of two main MSLs, which are arranged in parallel with a distance W equal to the wavelength A used, and one end of which is terminated with a non-reflection termination; A phase adjustment mechanism is provided which has a longitudinal direction in a direction perpendicular to the main MSL, and is composed of a plurality of sub-MSLs arranged between the main MSLs with minute intervals between both ends thereof and the main MSL. This problem was solved by selecting a secondary MSL to be connected to the main MSL, connecting both ends of the secondary MSL to the main MSL, and cutting the main MSL near the connection point on the side where the non-reflection termination of the main MSL exists.

e. Effect The phase is adjusted as follows.

Both ends of any sub-MSL among the plurality of sub-MSLs are connected to respective adjacent parts of the main MSL using bonding wires or the like.

The phase is measured at the input and output terminals of the phase adjustment mechanism, and the required phase adjustment amount is calculated from the measured value.

Select a sub-MSL that gives that phase difference, and then connect the sub-MSL and main MS
The connection points of L are transferred to both ends of the secondary MSL and to the respective adjacent portions of the primary MSL.

The phase changes depending on the line length. Therefore, as described above, by changing the connected sub-MSL, the phase changes.

At this time, the line on the opposite side of the connection terminal from the output terminal operates as a stub, so a non-reflection termination is provided.

After the adjustment is completed, the above influence is completely removed by cutting with a knife or the like a point near the connection point between the main MSL and the sub MSL and on the side of the non-reflection termination on the main MSL.

Problems include the stub effect of the extra main MSL portion remaining during adjustment and the occurrence of reflections due to discontinuities in the connection. An equivalent circuit for this explanation is shown in FIG.

As shown in FIG. 2, the extra MSL is included as a stub in parallel to the parallel susceptance jB. However, since this stub is terminated with a non-reflection termination, although it may generate reflection, it does not affect the transmission phase. Therefore, even if a stub is present during adjustment, the phase between the protruding ends can be accurately determined. Furthermore, since this part is separated after adjustment is completed, no reflection occurs during use.

Parallel susceptance is almost always generated at discontinuous portions, so reflected waves are generated. In the present invention, there are two sources from which the same reflection occurs due to the structure, and since the wavelength A of the frequency to be used is selected from the source, the respective reflections cancel each other out.

f. Embodiment FIG. 1 is a perspective view of a preferred embodiment of a phase adjustment mechanism used to implement the MSL phase adjustment method according to the present invention.

Two main MSLs arranged in parallel with a distance W equal to the wavelength A used 12. -13 are each terminated with a non-reflection termination 23.24, and the other end is provided with an input/output terminal 21.22, respectively. 2 main MSL 1
A plurality of sub-MLLs 14a, 14b, 14c, and 14d, each having a longitudinal direction perpendicular to 2.13, are arranged at small intervals between their ends and the main MSL.

In order to select a sub-MSL to be connected to the main MSL, first, both ends of an arbitrary sub-MSL (for example, 14a) are connected to the adjacent parts P, , P of the main MSL using connection means 15 made of, for example, bonding wires. do.

Next, the phase difference is measured at the input/output terminal 21.21/4, and the necessary phase correction amount is determined.

And the secondary MSL (for example, 14b) that provides the correction amount
, and connect both ends to the part Q of the main MSL adjacent to it.
1゜(h), and disconnects the previous sub-MSL 14a from the main MSL parts Pl and Pz. Note that in this example, the route difference for reconnection is twice the distance P,,Q, so , the phase difference can be easily determined by dividing the wavelength by this distance.

When the phase adjustment is completed, the input/output terminal 21 is connected near the Q point.
．． Point 16a on the side opposite to 22, ie on the side of the anti-reflection terminator.

The main MSL is disconnected at 16b.

Note that the amphibious MSL is formed symmetrically, that is, the distance from the non-reflective termination to the end point of the sub-MSL is
Preferably, L is equal.

Effect of g1 invention i) Phase adjustment is extremely easy.

ii) It is small and lightweight, and has sufficient performance for built-in use.

iii) Decrease in defect rate and cost.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a preferred embodiment of a phase adjustment mechanism used to carry out the phase adjustment method according to the present invention;
The figure is an equivalent circuit of the phase adjustment mechanism according to the present invention, and FIG. 3 is a perspective view of a microstrip line to which the phase adjustment method according to the prior art can be applied. 1, la...U-shaped micro net trip line, 2.3
... Input/output microstrip line, 4.5... Phase reference plane, 12, 13... Main microstrip line, 14a,
14b, 14c, 14d - sub microstrip line, 15... connection means, 16a, 16b cut point, 21, 22... input/output terminal, 23, 24... non-reflection termination. jII Figure 2 Figure 3 Hand 3 da and Yu 11 Original manuscript (self-produced) 1986 2
Mr. Michibe Uga, Commissioner of the Patent Office, announced on the 28th of May. 1. Indication of the case Patent Application No. 223978 of 1985 2. Name of the invention Method for adjusting the phase of microstrip line 3. Relationship with the previous case for amendment Name of the patent applicant (3381 Tokyo Keiki Co., Ltd. (and others 1)
Name) 4. Agent 〒107 5. Replace Figure 1 of the content of the amendment subject to amendment with Figure 1 of the drawing attached to this written amendment.

Claims (1)

[Claims] Two main microstrip lines are arranged in parallel with a distance W equal to 1/4 of the used wavelength λg, and one end is terminated with a non-reflection termination. A phase adjustment mechanism is provided, which is composed of a plurality of sub-microstrip lines having a longitudinal direction and arranged between the main microstrip lines with a small interval between both ends of the sub-microstrip lines and the main microstrip line. Select the sub-microstrip line to be connected to the line, connect both ends of it to the main microstrip line, and cut the main microstrip line near the connection point on the side where the non-reflection termination of the main microstrip line exists. A method for adjusting the phase of a microstrip line characterized by