JPS59169203A - Directional coupler of strip line - Google Patents

Abstract

PURPOSE:To simplify the constitution of a multi-distribution device with reduction of a loss and miniaturization of a substrate by providing three lines at the part of connection and using a 3-distribution device to a directional coupler of strip lines. CONSTITUTION:A directional coupler of strip lines is provided with a dielectric substance 1 and an earth conductor 2 of the 1st dielectric substrate, a dielectric substance 3 and an earth conductor 4 of the 2nd dielectric substrate, and the 3rd dielectric substrate 5 provided between the 1st and 2nd substrates. The center conductors 12-14 of a strip line are printed on both sides of the substrate 5. In such a constitution, a directional coupler of strip lines can serve as a 3-distribution device. As a result, the necessary area of a substrate can be reduced together with reduction of the line length of wiring. This can reduce the loss for production of a multi-distribution device in particular.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a directional coupler constructed of strip lines.

Here, for convenience of explanation, a case will be described in which the strip line is of a triplate type.

First, a conventional stripline directional coupler shown in FIGS. 1 and 2 will be explained. In Fig. 1, (1) and 1st @integrated board dielectric and ground conductor, (3)
and (4) are the visiting vehicle and ground conductor of dielectric substrates 1 and 2, (51&! third dielectric substrate, (6),
(71 is the center conductor of the strip line printed on both sides of the dielectric substrate (5). Figure 2 is a detailed view of the third dielectric ridge substrate (5). (81, (9+, aω) ,a
ll is an input/output terminal. This stripline directional coupler +'z dielectric +11. +3), ground conductor +21. +
41. It is a triplate type consisting of the center conductor (61, (71).By selecting the length e of the coupling part to be a quarter wavelength, the radio waves incident from the input/output end (8) have a length of l. It is distributed to the input/output end (9) with the coupling degree C determined from the conductor width W1 interval d of the center conductor of the section, and the remaining radio waves are output to the input/output switch: a11. It is zero.

The number of distributions for one stripline directional coupler is 2, and when manufacturing all multi-distribution distributors [ha].

The disadvantage was that the required board area would be large. Moreover, since the length of the wiring becomes long, there is also a disadvantage that the loss increases by p~.

In order to eliminate these drawbacks, this invention uses three lines in the coupling section to form one strip line directional coupler with three lines.
An embodiment of the present invention, which is a distributor, will be described below with reference to the drawings.

3 and 4 are diagrams showing the structure of a strip line directional coupler according to the present invention. In Figure 3 (1
) and (2) are the dielectric and ground conductor of the first dielectric substrate, (3) and (4) are the dielectric width and ground conductor of the second dielectric substrate, and (5) are the dielectric and ground conductor of the third dielectric substrate. body substrate.

(12), (+3, +141 are dielectric substrates (5
) is the center conductor of a strip line printed on both sides. FIG. 4 is a detailed diagram of the third dielectric substrate (5),
1151, fli! , u7+, QI3.

(19!, 201 are the input/output ends. The length l of the coupling part is a quarter wavelength. The i-wave incident from the input/output end 051 has the center conductor width w of the section of length l, , W2+
W3° interval d1. d2. It is distributed to the input/output terminal 1161 and the output terminal 1161 with the degree of coupling C1 and C2 determined from .

This configuration has only one difference) IJ tube line directional coupling! Since # is a three-way divider, there is an advantage that when manufacturing a divider with a multi-distribution ratio of 0%, the required substrate area is smaller than in the case of a conventional directional coupler. In addition, since the line length required for wiring is shortened, there is also an advantage in terms of characteristics such as loss is reduced.

FIG. 5 is a diagram showing another embodiment according to the present invention.

This is a directional coupler when an IJ tube line is constructed with two sheets of printed central conductor, and the center conductor of the strip line is 031. +241 is the dielectric substrate (2
1+ is printed on both sides, and the center conductor (center conductor) is printed on one side of the dielectric substrate (2z). [A 3-way divider can be formed on the base plate, and a strip line directional coupler suitable for configuring a multi-way divider can be obtained.

In addition, although the case where the plurality of wires 1#is center conductor of the connecting portion is printed on one or both sides of one or two dielectric substrates has been described above, this invention is not limited to this, and the present invention is not limited to this. Even when printing is performed on one or both sides of the dielectric substrate as described above, it can be carried out without any problems.

Further, although the case where the plurality of line center conductors are arranged in a straight line has been described, the case where the lines are arranged in any arbitrary curved line can be implemented in exactly the same manner.

As explained above, according to the present invention, one strip line directional coupler can distribute the low power into three parts, so that the structure of the multi-distributor can be simplified, the loss can be reduced, and the board can be saved. It has a big effect.

[Brief explanation of drawings]

1 and 2 are diagrams of a conventional stripline directional coupler, and FIGS. 3 and 4 are structural diagrams of a stripline directional coupler according to the present invention. FIG. 5 is a structural diagram showing another embodiment of the present invention. In the figure, (5), (2]1. f22+ is a dielectric substrate,
(61, (sword, +121°+131.041.
23+, 1241.1251 & engineering center conductor, +87
．． +9), Illσ, (Ill. +151.16+, +171, B8.11 &
'! It is an input/output terminal. Note that the same or equivalent 815 minutes in Figure 1 are given the same reference numerals. Figure 1 Figure 3 13 Figure 4 Figure 5 A

Claims (1)

[Claims] First and twentieth dielectric substrates each having a ground conductor surface on one surface, and the other surfaces of the first and second dielectric substrates, which are different from the ground conductor surface, facing each other. , and one or more dielectric substrates provided between these surfaces. A total of three or more stripline center conductors are printed parallel to each other in a section of a certain length using one or both surfaces of each of the one or more dielectric substrates. Stripline directional coupler.