JPH0964607A - Microstrip line device and microwave balance mixer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the difficulty of highly accurate and fine adjustment in adjustment technology for connecting a metallic chip, a dielectric substance or the like in the case of adjusting the effective line length of a microstrip line. SOLUTION: A dielectric block 12 partially changing its thickness and forming a ground face 13 on its rear surface is fitted to the ground face 3 of a dielectric substrate 1 on which microstrip lines 10 are formed so as to be relatively moved against the subtrate 1 and the ground faces 3, 13 of the substrate 1 and the block 12 are mutually electrically connected through conductive members 15. When the block 12 is moved, the thickness of the dielectric substance on the rear face of the lines 10 is changed and the effective line length of the lines 10 can be finely and highly accurately adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various devices formed of microstrip lines formed on a dielectric substrate, and more particularly to a microstrip line device capable of adjusting the effective length of the microstrip line and a microstrip line device using the same. Wave balance mixer.

[0002]

2. Description of the Related Art As a microstrip line device,
For example, there is a microwave balance mixer. This is
As shown in FIG. 3, the balance mixer body 6 is formed by the microstrip line 2 formed on the front surface of the ceramic substrate 1, the slot line 4 formed on a part of the ground surface 3 formed on the back surface, and the diode 5. And the two filters 7, 8 formed on the surface of the ceramic substrate 1.
The diplexer 9 is formed by, and the balance mixer main body 6 and the diplexer 9 are connected by a microstrip line 10 for connection. Then, by inputting a high frequency signal to the RF terminal and a local oscillation signal to the LO terminal, respectively, it is possible to output the frequency-converted intermediate frequency signal to the IF terminal.

By the way, in this balance mixer, the RF
The signal and the IF signal are isolated by the diplexer 9 by utilizing the difference in the frequency of the signal, but in this case, the impedance on the IF side becomes infinite (open) when viewed from the RF terminal, When viewed from the IF terminal, the impedance becomes infinite on the RF side, and when the diode 5 is viewed from each terminal, impedance matching is required for each signal frequency. Therefore, in order to satisfy the above conditions and bring out the performance of the mixer sufficiently, it is necessary to adjust the effective line length of the connecting microstrip line 10 with high accuracy.

When adjusting the effective line length of such a microstrip line, conventionally, as shown in FIG. 6, a metal strip 20 is formed on a part of the microstrip line 10.
Is performed, and the effective line length is adjusted by adjusting the size and position of the metal piece 10. As another method, for example, Japanese Patent Laid-Open No. 3-1
There are techniques described in JP-A-62103 and JP-A-61-248610. In these technologies as well, a conductive line or a dielectric is connected to the microstrip line to adjust the effective line length.

[0005]

However, as described above, in the technique of adjusting the effective line length by connecting the metal piece, the conductive wire, and the dielectric to the microstrip line, the size and the connecting position of these connecting parts are different. Since the characteristics are changed, the adjustment work becomes extremely complicated, and there is a problem that experience and skill are required to perform highly accurate adjustment. There is also a problem that it cannot cope with changes over time.

It is an object of the present invention to provide a microstrip line device and a microwave balance mixer which can easily adjust the effective line length of the microstrip line. Another object of the present invention is to provide a microstrip chain device capable of coping with a change in effective line length over time.

[0007]

A microstrip line device of the present invention has a dielectric substrate on the back surface of a dielectric substrate of a microstrip line device having a ground surface formed on the back surface and microstrip lines formed on the front surface. A dielectric block that is attached so as to be movable relative to each other, and the thickness of the dielectric block is partially different, and a ground surface is formed on the back surface of the dielectric block and the ground surfaces of the dielectric substrate and the dielectric block. And a conductive member for electrical connection.

The microwave balance mixer of the present invention comprises a balance mixer body composed of microstrip lines and slot lines provided on a dielectric substrate,
In a microwave balance mixer including a diplexer formed of a filter formed on a dielectric substrate and a microstrip line connecting the balance mixer body and the diplexer, the back surface of the dielectric substrate below the connection microstrip line. A dielectric block that is movable relative to the dielectric substrate, and a conductive member that connects the ground surface provided on the dielectric block to the ground surface provided on the dielectric substrate. The body block is characterized in that its thickness is partly different.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of an embodiment in which the present invention is applied to a microwave balance mixer, and the drawing is a perspective view of a main part thereof. The microstrip line 2 formed on the surface of the dielectric substrate 1 such as a ceramic substrate, the slot line 4 formed on a part of the ground surface 3 formed on the back surface, and the diode 5 form the balance mixer body 6. A diplexer 9 is formed by the two filters 7 and 8 formed on the surface of the dielectric substrate 1, and the balance mixer body 6 and the diplexer 9 are connected by a microstrip line 10 for connection. There is.
Then, by inputting a high frequency signal to the RF terminal and a local oscillation signal to the LO terminal, respectively, it is possible to output the frequency-converted intermediate frequency signal to the IF terminal.

Further, on the back surface side of the dielectric substrate 1, a straight concave groove 11 is extendedly formed corresponding to the linear main line portion of the connecting microstrip line 10, and the concave groove 11 is formed. Square rod-shaped dielectric block 1 inside
The part on the upper surface side of 2 is fitted. At least a part of the back surface of the dielectric block 12 is inclined in the thickness direction so that the thickness thereof is partially different, and a ground surface 13 is formed on the back surface thereof. . Further, the dielectric block 12 can be moved in the recessed groove 11 in the lengthwise direction to change its position, and the surface of the dielectric block 12 is used to indicate the position of movement in the lengthwise direction. The scale 14 is described.

The ground surface 3 on the back surface of the dielectric substrate 1 and the ground surface 13 on the back surface of the dielectric block 12 are electrically connected to each other by a plurality of metal ribbons 15. The metal ribbon 15 is connected with a sufficient length, and is formed so as not to become an obstacle when the dielectric block 12 is relatively moved with respect to the dielectric substrate 1. In addition, the connection position by the metal ribbon 15 is set at an appropriate plurality of positions.

In the microwave balanced mixer having such a configuration, as in the conventional balanced mixer shown in FIG. 5, the RF signal and the IF signal are isolated by the diplexer 9 by utilizing the difference in the frequency of the signals. However, in this case, the impedance on the IF side becomes infinite (open) when viewed from the RF terminal, and the impedance on the RF side becomes infinite when viewed from the IF terminal, and the diode 5 is connected from each terminal. When looking at, it is required that impedance matching be achieved for each signal frequency. Then, in order to satisfy this condition and bring out the performance of the mixer sufficiently, it is necessary to adjust the effective line length of the connecting microstrip line 10 with high accuracy.

In order to perform this adjustment, in this structure, the dielectric block 12 is moved along the groove 11 to change its position adjustment. Since the inclined ground surface 13 of the dielectric block 12 with respect to the connecting microstrip line 10 is moved by the movement of the dielectric block 12, the thickness of the dielectric with respect to the entire main line portion of the connecting microstrip line 10, that is, The distance to the ground plane 13 is changed, and the effective line length in the connecting microstrip line 10 can be adjusted accordingly.

Further, at the time of this adjustment, by using the scale 14 provided on the dielectric block 12, fine adjustment can be performed. Further, even if the effective line length is changed due to a change over time, the position of the dielectric block 12 can be adjusted with high accuracy by referring to the scale 14.
The effective line length can be finely and highly accurately adjusted. Even if the dielectric block 12 is moved for adjustment, the metal ribbon 15 can follow the movement due to its flexibility.

Here, as shown in FIG. 4, the dielectric block has a rear surface formed in a stepped shape so that the thickness thereof is partially different.
It may be constituted as. In this embodiment, the case of one stage is shown, and the dielectric block 12 is moved so that the portion having a large thickness is the connection microstrip line 10.
The effective line length of the connecting microstrip line 10 can be adjusted by changing the length directly opposed to.

In the case of the embodiment shown in FIG. 4,
It goes without saying that the back surface of the dielectric block 12A may have a staircase structure having two or more steps. Further, in each of the above embodiments, the concave groove is formed on the back surface of the dielectric substrate,
A guide member may be provided at a position along both sides of the connecting microstrip line, and the dielectric block may be sandwiched between the guide members and moved.

The microstrip line device of the present invention is not limited to the above-mentioned microwave balance mixer, but can be applied to various microstrip line devices that require highly accurate adjustment of the effective line length. it can.

[0018]

As described above, according to the present invention, a dielectric substrate having a microstrip line formed on the ground surface side has a ground surface formed on the back surface thereof with partially different thicknesses. Since the body block is attached so as to be movable relative to the dielectric substrate, and the ground surfaces of the dielectric substrate and the dielectric block are electrically connected to each other by a conductive member, it is possible to move the dielectric block. The thickness of the dielectric on the back surface side of the microstrip line is changed, and the effective line length can be finely and highly accurately adjusted. Further, even if it changes with time, it can be dealt with by simply changing the position of the dielectric block.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of FIG.

FIG. 3 is a side view of FIG. 2;

FIG. 4 is a side view similar to FIG. 3 in a different embodiment of the present invention.

FIG. 5 is a plan view showing an example of a microwave balance mixer to which the present invention is applied.

FIG. 6 is a schematic diagram for explaining a conventional technique for adjusting the effective line length of a microstrip line.

[Explanation of symbols]

 1 Dielectric Substrate 3 Ground Surface 6 Balance Mixer Main Body 9 Diplexer 10 Connection Microstrip Line 11 Groove 12 Dielectric Block 13 Ground Surface 14 Scale 15 Metal Ribbon

Claims (5)

[Claims] 1. A microstrip line device having a ground surface formed on the back surface of a dielectric substrate and a microstrip line formed on the front surface, wherein the back surface of the dielectric substrate is movable relative to the dielectric substrate. A dielectric block having a ground surface formed on the back surface thereof and having partially different thicknesses, and a conductive member electrically connecting the ground surfaces of the dielectric substrate and the dielectric block to each other. A microstrip line device comprising. 2. The microstrip line device according to claim 1, wherein the back surface of the dielectric block is inclined in the thickness direction. 3. The microstrip line device according to claim 1, wherein the back surface of the dielectric block is formed in a step shape. 4. The microstrip line device according to claim 1, wherein a plurality of locations on the ground surface of the dielectric substrate and the dielectric block are electrically connected to each other by a plurality of conductive ribbons or conductive wires. 5. A balance mixer main body composed of a microstrip line and a slot line provided on a dielectric substrate, a diplexer composed of a filter formed on the dielectric substrate, the balance mixer main body and a diplexer. In a microwave balance mixer including a microstrip line for connecting to a dielectric substrate, the dielectric provided on the back surface of the dielectric substrate under the connection microstrip line and movable relative to the dielectric substrate. A block and a conductive member connecting the ground surface provided on the dielectric block and the ground surface provided on the dielectric substrate, and the dielectric blocks are configured so that the thicknesses thereof are partially different. Microwave balance mixer characterized in that