JPS6322725B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a power divider suitable for use in a high frequency signal transmitter/receiver. In particular, micro-integrated circuits (MICs) using strip-slot coupled lines
The present invention relates to a power divider.

[Conventional technology]

An example of a conventional power divider using slot lines is shown in FIG. Figure 1a is a plan view, Figure 1b is a plan view.
It is an AA sectional view. In FIG. 1, numerals 1 to 3 are input/output slot lines, 4 is a coupling slot line, and 5 is an absorption resistor. Since this resistor 5 is usually designed by treating it as a lumped constant, it is better to make its dimensions as small as possible.

[Problem that the invention seeks to solve]

In the structure shown in FIG. 1, the resistance dimensions are determined by the line spacing of the coupled slot lines 4, but there is a drawback that this line spacing cannot be made sufficiently small in order to achieve input/output impedance matching.

Furthermore, if you want to mix strip lines and slot lines as input/output lines, this cannot be done without intervening a line conversion section, which increases the circuit size and also causes reflections at the conversion section. There was a drawback that the characteristics deteriorated.

In order to solve these drawbacks, the present invention uses a strip-slot coupled line in which a slot line is formed on the ground conductor surface of the microstrip line to be coupled to the strip line, thereby reducing the size of the resistor. The purpose is to make it possible to mix microstrip lines and slot lines in input/output lines.

[Means for solving problems]

In the present invention, a slot line is provided on the ground conductor surface of a microstrip line, and a resistor and a first, Connect the second input/output slot line, connect a circuit that provides a short-circuit surface at the operating frequency to the microstrip line side, short-circuit the slot line to the other end of the strip-slot coupled line, and connect the microstrip line. The feature is that an input/output microstrip line is connected to the microstrip line.

The circuit providing this short-circuit surface is preferably a strip line with an open end and a length corresponding to a quarter wavelength, or a screw that penetrates the ground conductor.

The second point of the present invention is that the slot line is provided on the ground conductor surface of the microstrip line.
One end of the strip-slot coupled line with a length of 1/2 is terminated on the slot line side with a resistor and a circuit that provides an open surface at the operating frequency,
The first and second input/output microstrip lines are connected in parallel on the microstrip line side, the slot line is short-circuited at the other end of the strip-slot coupled line, and the third input/output line is connected to the microstrip line. It is characterized by connecting input and output microstrip lines.

The circuit providing this open surface is preferably a quarter wavelength long slot circuit or slot cavity with shorted ends.

〔Example〕

FIG. 2 is a structural diagram of a first embodiment of the present invention. FIG. 2a shows a plan view, and FIG. 2b shows a BB sectional view. In this structure, slot lines are used for the input/output lines 1 and 2, and a microstrip line is used for the input/output line 3. 5 is an absorption resistor, and 6 is a strip-slot coupling line. 7 is a quarter wavelength microstrip line.

In the structure of this embodiment, on the upper surface of one flat insulating plate, there is provided one elongated conductor layer which becomes an input/output line 3 and a quarter wavelength line 7 continuous thereto. On the other hand, a ground conductor layer is formed on the bottom surface of this insulating layer so that this elongated conductor layer acts as a strip line, but a part of the ground conductor layer is removed to form a slot line. . That is, the slot lines 1 and 2 are provided on the bottom surface so as to be substantially orthogonal to the conductor layer on the top surface that becomes the line 3, and the strip line 3 on the top surface and the slot lines 1 and 2 on the bottom surface intersect with each other via an insulating plate. From the point
A slot line narrower than the strip line 3 is formed on the lower surface so as to be parallel and opposite to the strip line 3 on the upper surface. The length of this narrow slot line is one quarter wavelength in this example.

Further, a resistor 5 is arranged on the lower surface of the insulating plate at a position where the slot lines 1 and 2 intersect with the strip line 3 on the upper surface via the insulating plate so as to straddle the narrow slot line.

This structure is entirely composed of micro-integrated circuits (MICs). According to this structure, the incident wave from the line 3 is distributed to the slot lines 1 and 2 by the strip-slot coupling line 6 without being affected by the resistor 5, and is matched. Resistor 5
improves the isolation between slot lines 1 and 2.

The operation of this structure is the same as the conventional circuit using slot lines shown in FIG. 1, but since the strip-slot coupled line 6 is used, the width of the slot line becomes smaller, and the size of the resistor 5 can be reduced. It has the advantage of being able to The quarter-wavelength microstrip line 7 with an open end forms a short-circuit plane at the intersection of the line 3 and the lines 1 and 2.

FIG. 3 is a structural diagram of a second embodiment of the present invention. In this example, the short circuit point is replaced by a short circuit 8 formed by a through screw. This structure is basically the same as the structure shown in FIG. 2 above, and its operation can be considered in the same way.

FIG. 4 is a structural diagram of a third embodiment of the present invention. In this structure, a conductor layer that becomes the T-shaped strip lines 1', 2', and 3 is arranged on the upper surface of the insulating plate, and a conductor layer that becomes the ground conductor is provided on the entire lower surface. Only the part shown has a structure in which this conductor layer is removed in a thin, straight line to form a slot line. Resistor 5
are provided on the lower surface of the insulating plate at the thin portion of the conductor layer removed so as to be in contact with the conductor layer on both sides thereof. The part 6 in the figure is a strip-slot coupling line.

In this structure, all of the input/output lines 1', 1', and 3 are strip lines. The slot line 9 is a quarter-wavelength line with a short-circuited end, and forms an open state between the line 1', 2' and the ground at the intersection of the line 3. In this case as well, the width of the slot line becomes narrower, so the size of the resistor 5 can be made smaller.

FIG. 5 is a structural diagram of a fourth embodiment of the present invention. This structure is basically equivalent to the structure shown in Figure 4 above,
The feature is that an open surface circuit 10 formed by a slot cavity is provided in place of the quarter-wavelength slot line 9 with a short circuit at the tip. That is, the circular portion 10 shown in broken lines in FIG. 5 on the lower surface of the insulating plate is
This is a structure in which the conductor layer has been removed. A T-shaped conductor layer is formed on the upper surface of the insulating plate.

Even with such a structure, a power divider similar to the device shown in FIG. 4 can be obtained, and a small resistor 5 can be placed in a narrow slot line.

〔Effect of the invention〕

As explained above, by using a strip-slot coupled line, the size of the resistor can be reduced, good matching characteristics can be obtained, and different types of input/output lines can be used, providing greater flexibility. There are increasing benefits.

[Brief explanation of drawings]

Figure 1 is a structural diagram of a conventional power divider using slotted lines, where a is a plan view and b is a sectional view along AA. Figure 2 is a structural diagram of the first embodiment of the present invention (first invention)
A is a plan view, and b is a BB cross-sectional view. FIG. 3 is a structural diagram of a second embodiment of the present invention. FIG. 4 is a structural diagram of a third embodiment of the present invention (second invention). FIG. 5 is a structural diagram of a fourth embodiment of the present invention. 1, 2, 3, 1', 2'...Input and output lines,
4...Coupling slot line, 5...Absorption resistor, 6...
...Strip-slot coupled line, 7...1/4 wavelength strip line with open end, 8...Through screw for shorting, 9...1/4 wavelength slot line with short circuit at the end, 10...Slot cavity.

Claims (1)

[Claims] 1. A ground conductor is formed on the lower surface of a flat insulating plate, and a conductor layer constituting a strip line 3 serving as one input/output line is formed on the upper surface of the insulating plate, and this strip line 3, a narrow slot line is formed on the lower surface of the insulating plate so as to be parallel to and opposite to the insulating plate through the insulating plate, and is formed by removing the ground conductor over a length of about a quarter wavelength; A resistor 5 is connected to one end of this slot line, and circuits 7 and 8 are provided at one end of the slot line to short-circuit the strip line to ground at least at the operating frequency. A micro-integrated circuit power divider in which two slot lines 1 and 2, which serve as input/output lines, are formed on the lower surface of the insulating plate. 2. The micro-integrated circuit power divider according to claim 1, wherein the circuit for short-circuiting the strip line to ground is a strip line with an open end and a length corresponding to a quarter wavelength. 3. The circuit for short-circuiting the strip line to the ground is a screw penetrating the ground conductor. Claim 1
Micro-integrated circuit power divider as described in Section. 4. A ground conductor is formed on the bottom surface of a flat insulating plate, and a conductor layer constituting a strip line 3 serving as one input/output line is formed on the top surface of the insulating plate, parallel to this strip line 3 and above. A narrow slot line is formed by removing the ground conductor over a length of about a quarter wavelength on the lower surface of the insulating plate so as to face each other with the insulating plate interposed therebetween, and one end of this slot line is formed. A resistor 5 is connected to the insulating plate at one end of the slot line, and circuits 9 and 10 are provided at one end of the slot line to provide an open circuit between the strip line and the ground at least at the operating frequency. A micro-integrated circuit power divider in which two strip lines 1' and 2', which serve as input/output lines, are formed on the upper surface to connect with the strip line 3. 5. The circuit providing an open circuit between the strip line and the ground is a slot line whose tip is short-circuited and whose length corresponds to a quarter wavelength.
Micro-integrated circuit power divider as described in Section. 6. The circuit providing an open circuit between the strip line and the ground is a slot cavity.
Micro-integrated circuit power divider as described in Section.