JPS6339204A - Stip line circuit - Google Patents

Abstract

PURPOSE:To attain the easy, secure and desired adjustment of characteristics by providing an earth electrode in a strip line circuit, which provides an earth electrode 2 on one surface of a dielectric substrate and a circuit pattern electrode on the other surface, with a notch part on some part confronted with the circuit pattern electrode. CONSTITUTION:The earth electrode 2 is provided with the notch part 5 and some part of the electrode 2 is notched. Thus an electric field distribution curve concentrating on the circuit pattern electrode 1 and the earth electrode 2 at the time of full earth is scattered, and an electric field can be equally distributed. Without the earth electrode, a strip line is not constituted. However, the earth electrode 2 merely removes some part, and the electric field can be uniformly distributed without losing the characteristic of the strip line. An adjustmentenabled element 6 made of metal or dielectric is provided in the vicinity of the electrode notch part 5 formed in such a way, whereby the action of the adjustment element affecting the field distribution increases, and the characteristic of the strip line circuit is easily and surely adjusted.

Description

[Detailed Description of the Invention] [Summary] A notch is provided in the ground electrode part of a strip line circuit in which a ground electrode is provided on one surface of a dielectric substrate and a circuit pattern electrode is provided on the other surface, and the electric field distribution is This is a strip line circuit whose characteristics can be easily changed by changing the spread of the line and providing an adjustable element at that position.

[Industrial application field]

The present invention relates to improvements in high frequency circuits made of strip lines.

A stripline in which a ground electrode is provided on one side of a dielectric substrate and a circuit pattern electrode is provided on the other side is used to construct a high frequency circuit.

For example, a high frequency filter can be constructed depending on the shape given to the circuit pattern electrodes on the dielectric substrate.

It is desirable that the characteristics of a circuit configured in this manner can be adjusted as necessary.

[Conventional technology]

An example of a conventional configuration of a stripline circuit is shown in FIG.

3A is a plan view, FIG. 1B is a bottom view, and FIG. 1C is a sectional view.

Further, the configuration of a conventional filter with adjustable characteristics is shown in cross-sectional views in FIGS. 6(a) and 6(b).

In both drawings, 1 is a circuit pattern electrode, 2 is a ground electrode, 3 is a dielectric substrate, 4 is a housing, and 6 is an adjustable element.

When configuring a high frequency filter using a strip line,
A fifth band-shaped circuit pattern electrode 1 is provided on the surface of the dielectric substrate 3.
The other ground electrode 2 is provided in the shape shown in FIG. 3(a), and the other ground electrode 2 is provided so as to cover the entire back surface of the dielectric substrate 3 as shown in FIG. 3(b).

FIG. 3C shows a cross-sectional view, and has a structure in which a circuit pattern electrode 1 is provided on the upper surface of the dielectric substrate 3, and a ground electrode 2 is provided on the lower surface.

The characteristics are determined by the shape of the circuit pattern electrode 1, and it is desirable that the characteristics of a high frequency filter such as this can be changed by providing an adjustable element.

FIG. 6 is a cross-sectional view showing the configuration of the adjustable high-frequency filter. A dielectric piece for the circuit pattern is added on the circuit pattern snow shovel 1.

[Problem that the invention seeks to solve]

The conventional stripline circuit described above has an equivalent capacitance distribution C as shown in the electric field distribution curve 7 in FIG. 7a or as shown in FIG. 8a.
An electric field distribution curve 7 is generated between the circuit pattern electrode 1 and the earth electrode 2. The characteristic of the stripline circuit is that a metal or dielectric adjustable element 6 that changes the shape of the electric field distribution curve is inserted into the electric field to change the distribution.

However, in the conventional stripline circuit, the ground electrode 2
covers the whole of one surface of the dielectric substrate 3, the electric field distribution curve 7 does not extend downward beyond the earth electrode 2, and the electric field distribution curve from the circuit pattern electrode 1 extends beyond the earth electrode 2.
end with. In addition, since it is concentrated within the dielectric substrate 3 and there is almost no element extending upward from the circuit pattern electrode 1, even if an adjustment element is provided, the effect that affects the shape of the electric field distribution curve is minimal, and the desired characteristic adjustment is possible. The problem is that it becomes impossible.

[Means for solving problems]

The above problems are solved as shown in the principle diagram of the present invention in FIG.
A notch 5 is provided in the ground electrode 2 of the strip line circuit, which has the ground electrode 2 on one side of the dielectric substrate 3 and the circuit pattern electrode 1 on the other side, in a part thereof facing the circuit pattern 1 bottle 1. This problem is solved by the stripline circuit of the present invention.

[Effect]

According to the present invention, by providing the notch 5 in the earth electrode 2 and cutting out a part of the earth electrode 2, the electric field distribution curve 7 that is concentrated between the pattern electrode 1 and the earth electrode 2 when the entire surface is earthed can be dispersed and the electric field can be distributed isotropically.

Figures 7b and 8b show an electric field distribution diagram and an equivalent capacitance distribution diagram of a cross section of a dielectric substrate without a ground electrode.

In this case, the electric field distribution curve 7 emitted from the circuit pattern electrode 1 is evenly distributed in all directions. If there is no ground electrode, no strip line is formed, but in the case of the present invention, only a portion of the ground electrode 2 is removed, so the characteristics of the strip line are not lost, and the electric field is evenly distributed.

By providing the adjustable element 6 made of metal or dielectric in the vicinity of the electrode notch 5 created in this way, the effect of the adjusting element on the electric field distribution is increased, and the characteristics of the stripline circuit can be surely and easily adjusted. Make it.

〔Example〕

The present invention will be described in detail according to the illustrated embodiments.

FIG. 2 is an electrode configuration diagram of a high frequency filter made of a stripline circuit according to the present invention, and FIG. 3 is a sectional view of an adjustable high frequency filter.

Figure 2 shows a half-wavelength side-coupled filter, (
a) and (b) are plan views of the circuit pattern 1 bottle 1. A broken line 8 indicates the positional relationship of the circuit pattern electrode 1 corresponding to the earth electrode 2 provided with the notch 5. Moreover, (C) is a bottom view of the earth electrode 2 provided with the notch part 5.

In a half-wavelength side-coupled filter, the area between the stripes of the pattern of the circuit pattern electrode 1 (FIG. 2(a)) or the tip of the stripe (FIG. 2(b)) has a large effect on the characteristic change. Therefore, it is effective to provide a notch 5 in a part of the earth electrode 2 corresponding to the position of the broken line 8 of the circuit pattern electrode 1.

The stripline circuit made in this way is housed in a housing 4 as shown in FIG. The housing 4 includes an adjustable element 6 near the notch of the ground electrode.

The characteristics can be adjusted by means of an adjustable element 6 extending from below the ground electrode toward the notch 5 or by an adjusting element 6 extending from above the circuit pattern electrode 1 facing the notch 5 .

FIG. 4 shows a characteristic diagram of a bandpass filter, with loss plotted on the vertical axis and frequency r plotted on the horizontal axis.

10 is a transmission characteristic, 11 is a reflection characteristic, and a metal or dielectric element for adjustment makes it possible to adjust the electric field distribution or distributed capacitance between the circuit pattern electrode 1 and the earth electrode 2,
It is possible to adjust and modify the in-band characteristics of the section 12 in the transmission characteristic 10 and the section 13 of the reflection characteristic 11, the bandwidth Δf between fl and 12, or the characteristic of fl or f2. It is clear that the cutout portion 5 of the earth electrode provided in the present invention should be kept within a range that does not make the propagation characteristics of the circuit different from those of the microstrip line.

〔Effect of the invention〕

According to the present invention, the characteristics of the microstrip line circuit can be effectively adjusted, and the effects thereof are extremely large.

[Brief explanation of the drawing]

Fig. 1 is a principle diagram of the present invention, Fig. 2 is an electrode configuration diagram of a filter according to an embodiment of the present invention, Fig. 3 is a sectional view of a filter according to an embodiment of the present invention, and Fig. 4 is an embodiment of the present invention. Figure 5 is an electrode configuration diagram of a conventional filter, Figure 6 is a sectional view of a conventional filter, Figure 7a is an electric field distribution diagram of a cross section of a dielectric substrate with a ground electrode, and Figure 7b is a diagram of the electric field distribution in a cross section of a dielectric substrate with a ground electrode. Fig. 8a is an electric field distribution diagram of a cross section of a dielectric substrate without a ground electrode, Fig. 8a is an equivalent capacitance distribution diagram with a ground electrode, and Fig. 8b is an equivalent capacitance distribution diagram without a ground electrode. In the figure, 1 is a circuit pattern electrode, 2 is a ground electrode, 3 is a dielectric substrate electrode, 4 is a housing, 5 is a notch, 6 is an adjustable element, 7 is an electric field distribution curve, 10 is a pass characteristic, 1st Fig. 2 Fig. 3 flOf2 - Frequency r Characteristic diagram of the filter of the present invention - Swordfish Fig. 4 Electrode configuration diagram of a conventional filter Fig. 5 Cross-sectional view of a conventional filter Fig. 6 Fig. 7a Fig. 7b figure

Claims (1)

[Claims] A circuit pattern electrode (1) is placed on one side of the dielectric substrate (3).
) is also provided with a ground electrode (2) on the other surface, a cutout (5) is provided in a part of the ground electrode (2) facing the circuit pattern electrode (1), and a cutout (5) is provided in the vicinity of the cutout of the ground electrode. A stripline circuit comprising an adjustment element (6).