JPS60124101A - Branch line coupler - Google Patents

Abstract

PURPOSE:To increase mounting density by stacking plural tri-plate lines in the thickness direction and connecting respective inner conductors through conductors made by through-hole plating to constitute a branch line coupler in three dimensions. CONSTITUTION:In the branch line coupler consisting of a three-dimensional circuit, respective inner conductors 2a, 2b of two tri-plate lines are connected through the conductors 4c made by the through-hole plating at positions 6a, 7a separated by lambdag1/4 each other. The conductors 4c are surrounded by conductors connecting conductive patterns 5a surrounding said positions 6a, 7a and constituted equivalently to a coaxial line. The length of the equivalent coaxial line can be set up to lambdag/4 by selecting the specific inductive capacity of substrates 1a,...,1c and its impedance can be set up to a required value by selecting the size of the equivalent coaxial line, so that required characteristics is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement of a triplate line type branch line coupler used in microwaves.

[Conventional technology]

FIG. 1 shows a partially removed perspective view of a tri-rate strip line (hereinafter referred to as a tri-plate line).

In the figure, (la) has a line width W on a part of one side)
A dielectric substrate A, (lb) made of a dielectric material with a relative dielectric constant εr, in which the IJ tube conductor (2) is closely adhered to the ground plate (3) made of metal on the entire surface of the other side, has a ground plate (lb) on only one side.
3) is a dielectric substrate B in close contact with the substrate.

Compared to microstrip lines (hereinafter referred to as MIC), this triplate line has the advantages of having closed threads, so there is no radiation loss, and leakage power does not affect other equipment. , often used in antenna power supply circuits 1, etc.

FIG. 2 shows a plan view of a branch line coupler using this triplate line.

In the figure, (4a) indicates input/output terminals Pi, P2 . P3,114 triplate line, (
4b) and (4C) are triplate lines having different characteristic impedances and forming a branch line coupler.

Triplate line (4b).

Characteristic impedance of (4C), x, Zob, Zoc
rL ) ') Characteristic impedance 7 of the plate line (4a), determined by oa and output power ratio 1 For example, if the output power to the output 2 terminal is 13 dB, 7. oa is 500
When.

Zob is 5UQ and ZOC is 35.40. moreover.

At this time, the axial length of the triplate lines (4b) and (4c) is 2, for example, λg/4. Here, λf is the propagation wavelength.

At this time, this branch line coupler is one, for example, the second
The microwave 'r[·force input from Pl in the figure is.

It is equally distributed and becomes the output 'I'11 of P3 and P4.

Also.

P2 is an isolation terminal, through which microwaves do not propagate.

A dielectric substrate using a conventional franchise line coupler configured as described above has the following drawbacks.

(1) Since one dielectric substrate is surrounded on all four sides by triplate lines each side having a length of λf/4, the area occupied on one plane is large; The packaging density of microwave components becomes low.

(2) If this branch line cup is used and a large number of microwave components are required, they cannot be configured on the same plane, and the number of dielectric substrates must be increased.

[Summary of the invention]

This invention was made with the aim of improving these drawbacks, and by providing a tri-plate line (4b) in the thickness direction of the dielectric substrate, the branch line coupler, which was conventionally composed of a planar circuit, is now composed of a three-dimensional circuit. This paper proposes increasing the mounting density of microwave components on one dielectric substrate.

[Embodiments of the invention]

First, to the extent necessary for explaining this invention, we will introduce a triplate line/triplate that connects between different triplate lines in two layers when the body board is multilayered. Plate line converter (hereinafter referred to as converter).

) will be explained.

FIG. 3 is a partially cutaway perspective view of this transducer.

In the figure, (51, (61, (71) are strip numbers; turns B, C, and A, respectively.

On one side of the dielectric substrate (1a) of this converter, a fourth
Strip turn A171, an enlarged view of which is shown in Figure (4)
．． A strip pattern B(5) is provided.

In addition, the other surface of the dielectric substrate (1a) (base plate 13101
11) is provided with a strip pattern shown in ) of FIG. Similarly, the dielectric substrate (1b) has a fifth
Strippno, an enlarged view of which is shown in Figure (4); Turn C (6)
A strip pattern C (6) shown in FIG. 5 is provided on the main plate (3) side. Then, on the dielectric substrate (IC), as shown in Fig. 6 (4)
Strip pattern C (6) and strip pattern B (5) shown in enlarged view are shown in Figure 6 (B) on the main plate (3) side.
A strip pattern C(6) shown in is provided,
The dielectric substrate (ld) has a strip pattern B (5) whose enlarged view is shown in the 71st prisoner) on the ground plate t31 (1111).
The IJ knob patterns shown in FIG. 7(B) are provided respectively.

The surfaces on which the strip patterns shown in FIG. 4 (4) and (B) are formed are the front and back sides of the dielectric substrate (1a), respectively, and similarly, (4)
The surfaces on which the strip patterns shown in and (B) are formed are dielectric substrates (lb) and (IC), respectively.

The front and back sides of (1d).

Strip pattern B (51, strip pattern C (
The through holes provided in 6) are plated by a plating method called "through hole plating".

FIG. 8 shows a cross-sectional view of the through-pole portion after through-hole plating. This results in Strinop pattern C (
6) is a strip pattern person (7).

In addition, the strip pattern B (5) of the dielectric substrate (la)
) is connected to the dielectric substrate (
1F electrically connected to the strip pattern B (5) of 1d). In other words, through-hole plating is used to electrically connect strip patterns on the front and back sides of a dielectric substrate.

In a converter configured using a dielectric substrate such as C, the propagation mode of the dielectric substrate (lb) and (Ic) portions can be equivalently considered as a coaxial mode. In other words, the outer diameter of the through-hole plating connecting strip pattern C (6) to strip pattern A (7) is the outer diameter of the inner conductor.
It is considered that the electrically equivalent short-circuit surface formed by the outer diameters of the plurality of through-hole platings in the IJ knob pattern B(5) becomes the inner diameter of the inner conductor.

Here, it is assumed that the distance between adjacent through-hole platings in the strip pattern B(5) is sufficiently small compared to the wavelength. Therefore, the characteristic impedance of this coaxial line can be easily adjusted by changing the outer diameter of the non-through-hole plating provided in the strip pattern C(6) and the dimensions of the electrically equivalent short-circuit surface.

FIG. 9 is a partially removed perspective view of a branch line coupler of a three-dimensional circuit showing an embodiment of the present invention.

In the figure, (5a) is strip pattern D, (61) is strip pattern E, and (7a) is strip pattern F.
It is.

The branch line coupler according to the present invention is composed of a tri-plate line (4b), a dielectric substrate (1b), and an equal number of axis lines formed in an (IC).

The dielectric substrate of the branch line coupler of this three-dimensional circuit (
la) is provided with a strip pattern F (7a) and a strip pattern D (5a) whose enlarged view is shown in FIG. 10(A), and on the ground plate (3) side of the dielectric substrate (la), A strip pattern shown in ) in FIG. 10 is provided. Here, in the strip pattern F (7a),
A strip conductor (2a) is connected. Similarly, the dielectric substrate (1b) has a strip pattern B (6a) and a strip pattern D (enlarged view shown in FIG. 11(A)).
5a), a strip pattern C (6) shown in Figure 11 (+3) is provided on the main plate (3) side. Then, the strip pattern D (5a) and the strip pattern Yg (6a), which are shown in an enlarged view in FIG. +3)
A strip pattern C(6) shown in FIG.

Here, a strip conductor (2b) is connected to the strip pattern B (6a). The dielectric substrate (1d) has a strip pattern D shown in an enlarged view in FIG. 13(4).
(5a) and strip pattern F (7a) are
) side is provided with a strip pattern shown in ) in FIG. Also, strip pattern D (5a) (!
:The through-hole of the strip conductor E (6a) is plated as shown in Figure 8, and the strip conductors (2a) and (2b) are connected through each dielectric substrate. electrically connected.

FIG. 14 is a sectional view of the branch line coupler of the three-dimensional circuit of the present invention shown in FIG. 9.

In the figure (8) are dielectric substrates (la), (lb), (IC)
, (ld) is a G gold Jj\ plate that fixes it.

The branch line coupler according to the present invention includes triplate lines (4b) and (4C) having different characteristic impedances.
The characteristic impedance of each is 50Ω and 35.40 as in the conventional case, and the electrical length of each is λ.
It is composed of f/4.

Therefore, in this branch line coupler, the microwave power input from 2, for example, Pl is equally divided into two, P3 and P4.
The output power will be . Further, P2 is an isolation terminal, and microwaves do not propagate.

From now on, the branch line coupler of this invention
It can be seen that it exhibits good characteristics similar to the conventional branch line coupler shown in the figure.

Note that, although the above description describes a branch line coupler that equally distributes microwave power, it goes without saying that this invention is not limited to this and can also be applied to a branch line coupler that distributes microwave power unevenly. Although the question was asked regarding the number of body substrates as four, it can also be applied to multilayer dielectric substrates configured with four or more dielectric substrates. Further, the characteristic impedance and axial length of the triplate line constituting the branch line coupler are not limited to the values used in the explanation.

〔Effect of the invention〕

As described above, the present invention has the effect of increasing the mounting density of microwave components on one dielectric substrate by using a branch line coupler of a three-dimensional circuit.

Further, by using a three-dimensional circuit branch line coupler instead of a planar circuit branch line coupler, an increase in the number of dielectric substrates can be prevented even when a large number of microwave components are required.

[Brief explanation of the drawings] Figure 1 is a partially removed perspective view of the tri-plate line;
The figure is a plan view of a conventional branch line coupler, and FIG. 3 is a partially removed perspective view of an exchanger that connects triplate lines in different layers when a dielectric substrate used in conventional microwaves is multilayered. FIG. 4 (6) is an enlarged view of strip patterns A and B and the strip pattern formed on the back surface of the substrate. Figures 5(A) and ([3) are enlarged views of strip pattern C formed on the back side of strip patterns B, C and J[.
Figure 6 (A) and [F]) are enlarged views of strip patterns B and C and strip pattern C formed on the back side of the substrate.
Figure 7 (4), Q3) is an enlarged view of the IJ knob pattern B and the IJ knob pattern formed on the back side of the substrate.
The figure is an explanatory diagram of through-hole plating, Figure 9 is a partially removed perspective view of a branch line coupler according to the present invention, and Figures 10 (4) and (b) are strip patterns D and F formed on the back side of the board. An enlarged view of the strip pattern, FIG.
Figure 12, 03) is strip pattern D. E and an enlarged view of the strip pattern C formed on the back side of the substrate, FIG. 13 (g), Q3) is the strip pattern D. FIG. 14 is an enlarged view of the strip pattern formed on the back surface of the substrate and a cross-sectional view of the branch line coupler according to the present invention. In the figure, (la), (Ib), (lc), and (ld) are the dielectric substrate (2) (2a)-(2b) it strip conductors, (3) is the ground plane, and (4) is the branch line coupler. Triplate line with different characteristic impedance (4a)
, (4b) and (4c). (5)・(5
a) is strip pattern B and D (61); (6a) is strip pattern C and B, T7+, (7a) is strip pattern A and F; (8) is a metal plate. 5111 (A) (8) Figure 6 (A) (B) Figure 8 Figure 9 Figure 10 (A) (8 Figure 11 Figure 12 (A) (13) Mi ζ 32

Claims (1)

[Claims] One of the two dielectric substrates has a copper foil coated on only one side, and the other dielectric substrate has a copper foil coated on one side and the other A strip conductor made of copper foil processed to the required dimensions is applied to each side. In a branch line coupler using a triplate strip line constructed by stacking these two dielectric substrates so that their respective copper foils are on the outside, the dielectric substrates are multilayered. A plurality of through holes are provided perpendicularly to the thickness direction of the dielectric substrate from the IJ tube helix between the IJ tube lines. By providing a plating layer on the inner wall of the through hole, it is possible to connect triplate strip lines of different levels for 1 hour.
A branch line coupler characterized in that the branch line coupler is formed three-dimensionally in the thickness direction of a multilayer dielectric substrate by forming a plurality of triplate line/triplate line converters that are electrically connected to each other. .