JPH0267802A - Micro strip line - Google Patents

Abstract

PURPOSE:To miniaturize a matching circuit by forming matching stubs in a dielectric substrate between a strip conductor and a ground conductor substrate. CONSTITUTION:Matching stubs 4a and 4b are formed in a dielectric substrate 1 between a strip conductor 3 and a ground conductor substrate, and the stub 4a has the conductor projected from the strip conductor 3 into the dielectric substrate 1, and the stub 4b has the conductor projected from the ground conductor substrate 2 into the dielectric substrate 1. Recessed parts of desired size and depth are formed from the side of the strip conductor 3 and the side of the ground conductor substrate 2 by a twist drill or the like and a metal is vapor-deposited in these recessed parts to form stubs 4a and 4b. Thus, a matching circuit element consisting of stubs and capacitors does not occupy a wide area.

Description

[Detailed Description of the Invention] [Industrial Application Field] The invention of B relates to a microstrip line of a high frequency circuit, and particularly relates to the structure of a matching circuit element thereof.

[Conventional technology]

Figure 2 shows the matching port of a conventional microstrip line? #
A J element is shown.

Figure 2 shows an example of a matching circuit element in a microstrip/fin structure in which a dielectric substrate 1 is sandwiched between a ground conductor substrate 2, a stub conductor 3, and a stub 4.
A matching circuit element according to the present invention and a matching circuit in which a strip conductor 3 is grounded to a ground electrode 6 through a capacitor 5 are shown.

Next, the operation will be explained. In a high frequency circuit, a matching circuit is essential for effectively transmitting high frequency power. Therefore, the length and position of the stub 4 shown in FIG. 2 are changed to achieve alignment.

[Problem to be solved by the invention]

High frequency circuits require matching circuits to effectively transmit high frequency power. By the way, a matching circuit in a conventional microstrip line requires a stub 4 and a capacitor 5 as shown in FIG. However, stub 4. Since the capacitor 5 occupies a large area on the matching circuit in the microstrip line, it becomes an obstacle to downsizing the circuit. Further, the capacitor 5 has problems such as a decrease in reliability due to an increase in the number of parts.

The present invention has been made to solve the above-mentioned problems, and aims to provide a microstrip line that eliminates stubs and capacitors that occupy a large area on a matching circuit.

[Means to solve the problem]

The microstotube line according to the present invention has a matching stub formed in a dielectric substrate between a strip conductor and a ground conductor substrate.

[Effect]

In this invention, since the stub is formed in the dielectric substrate between the strip conductor and the ground conductor substrate, the matching circuit element does not occupy a large area.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

FIGS. 1(a) and 1(b) are a perspective view and a cross-sectional view taken along the line A-A of a matching circuit in a microstrip line according to an embodiment of the present invention. In FIG. 1, 4a and 4b are stubs formed in the dielectric substrate 1 between the strip conductor 3 and the ground conductor substrate 2. In FIG. The stub 4b is a matching circuit element having a conductor protruding into the substrate 1, and the stub 4b is a matching circuit element having a conductor protruding from the ground conductor substrate 2 into the dielectric substrate 1.

Note that these stubs da and 4b are connected to the strip conductor 3.
It can be easily formed by making a recess of a desired size and depth with a drill or the like from the ground conductor substrate 2 side or by depositing metal there.

As can be seen from the embodiment shown in FIG. 1 above, in this structure, the matching stubs 4a and db are
The stub 4 and the capacitor 5 do not occupy a large area on the circuit as in the conventional case. by the way,
Although two stubs 4a and 4b are shown in this embodiment, matching may be achieved depending on the position, size, and number.

〔Effect of the invention〕

As explained above, in this invention, since the matching stub is formed in the dielectric substrate, the matching circuit can be made smaller, and the reliability can also be improved due to the reduction in the number of parts. .

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are a perspective view and a sectional view taken along line A-A of a microstrip line according to an embodiment of the present invention, and FIG. 2 is a perspective view of a conventional microstrip line. In the figure, 1 is a dielectric substrate, 2 is a ground conductor substrate, 3 is a strip conductor, and 4a and 4b are stubs. Note that the same reference numerals in each figure indicate the same or corresponding parts. Figure 1 Agent: Masuo Oiwa (2 others) b Figure 2

Claims (1)

[Claims] A microstrip line, which is a high frequency transmission line, is characterized in that a matching stub is formed in a dielectric substrate between a strip conductor and a grounded conductor substrate.