JPH0628803Y2 - Transmission line connection structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to connection of transmission lines used as microwave / millimeter wave transmission lines by connecting central conductors of a coaxial line and a triplate line in a conductive manner. It is about structure.

[Prior Art] As a conventional transmission line connection structure, when connecting the coaxial line 4 to the triplate line 1, for example, as shown in FIG.
As shown in FIG. 4 (b), the center conductor 5 of the coaxial line 4 is soldered to the center conductor 2 of the triplate line 1 for connection, or as shown in FIG. The conductor 5 is connected to the center conductor 7 of the triplate line 6 and the dielectric 8a.
It was connected by sandwiching it with.

[Problems to be Solved by the Invention] However, in the conventional technology as described above, in the case of connection by soldering, the width and height of the solder 3 applied to the central conductor 2 of the triplate line 1 are the amount of solder. There is a drawback that the impedance is not stable because it is not constant and varies depending on. In the connection by sandwiching, since the central conductor 5 of the coaxial line 4 and the central conductor 7 of the triplate line 6 are sandwiched and fixed by a pair of upper and lower dielectrics 8a and 8b, the upper dielectric There is a problem that one end of 8a is lifted up by the thickness of the central conductor 5 of the coaxial line 4 and an air gap 9 is generated between the central conductor 7 of the triplate line 6 and the upper dielectric 8a. The gap 9 changes depending on the size and shape of the dielectrics 8a and 8b forming the triplate line 6 and the method of sandwiching the dielectrics 8a and 8b, and in the length direction of the dielectrics 8a and 8b. Since it is formed wide, there is a problem that the impedance varies. Further, when the dielectric material is formed of a polymeric material having elasticity and conductivity, the void 9 can be deformed to the minimum as shown in FIG. 6 (a). As shown in b), the distance b between the outer conductor and the center conductor 7 is different from the distance a due to the deformation, which causes a problem that the impedance varies.

Therefore, the present invention has been made in order to solve the above-mentioned problems, and a coaxial line is formed by disposing a minimum required space portion in a dielectric on the side facing the central conductor and deforming the corner portion of the space portion. Also, a transmission line connection structure can be provided in which the center conductor of a triplate line can be sandwiched and fixed between dielectrics while maintaining a constant distance, and a stable impedance can be obtained without forming an extra gap unlike the conventional case. The purpose is to

[Means for Solving the Problems] To achieve the above object, the transmission line connection structure of the present invention includes a first dielectric 13 having a first central conductor 11 and the first central conductor 11. Second provided so as to cover
And a pair of outer conductors 14 and 14, a triplate line 10, a second central conductor 16 and an outer conductor 17 concentrically provided on the second central conductor 16. In the connection structure of the transmission line that connects the coaxial line 15 to the coaxial line 15, the second central conductor 16 has a connecting portion 19 protruding from the first central conductor 11 and having a predetermined width and a predetermined length. The second dielectric 12 is made of a material having elasticity, and the second dielectric 12 has a connecting portion 19 on the side facing the connecting portion 19 of the first central conductor 11. The pressing portion 21 cut out by the predetermined length along the predetermined width is provided, and the connecting portion 1 of the second center conductor 16 is provided on the first center conductor 11.
When the second dielectric 12 is pressed toward the connecting portion 19 in a state where 9 are superposed, the pressing portion 21 is elastically deformed and the connecting portion 19 is pressed and fixed in the direction of the first central conductor 11. It has a feature.

[Operation] The coaxial line 15 is provided on the center conductor 11 of the triplate line 10.
Of the central conductors 16 and 16 are overlapped, and the second dielectric 12 having the pressing portion 21 corresponding to this overlapping position
When pressed in the direction, the pressing portion 21 of the second dielectric member 12 is elastically deformed due to the elastic structure, so that the central conductor 11,
The center conductors 11 and 16 are sandwiched and fixed between the first and second dielectric bodies 13 and 12 while maintaining a constant gap between the outer conductors 16 and the outer conductors 14 and 17.

[Embodiment] FIG. 1 (a) is a side sectional view of a transmission line connection structure showing an embodiment of the present invention, and FIG. 1 (b) is a sectional view taken along the line AA in FIG. 1 (a). FIG. 1 (c) shows the connection structure of the transmission line according to the same embodiment, and is a cross-sectional view showing the state before assembly of the cross section along the line AA in FIG. 1 (b), and FIG.
It is a figure which shows the structure of the dielectric material.

The transmission line according to this embodiment is used for transmitting microwaves and millimeter waves, and the center conductors of the coaxial line and the triplate line are electrically connected.

The triplate line 10 includes a first central conductor 11, a pair of dielectrics 12 and 13, and a pair of outer conductors 14. The first central conductor 11 is adhered and formed on the surface of the first dielectric 13 located below the pair of dielectrics. The second dielectric 12 is located above the pair of dielectrics, overlaps with the first dielectric 13, and is provided so as to cover the first central conductor 11. And each outer conductor 14,
14 is provided so as to sandwich the first dielectric 13 and the second dielectric 12.

The coaxial line 15 has a configuration in which the second central conductor 16 is covered with the outer conductor 17 and the dielectric 18, and the cross section thereof is formed in a concentric shape. And the second central conductor 16
Has a connecting portion 19 at its tip and is formed in a tongue shape.

By the way, the second dielectric 12 among the above-mentioned dielectrics is
For example, it is made of an elastic and conductive polymer material such as Duroid (trade name), and its elasticity is such that when the center conductor is sandwiched and fixed between dielectrics, the center conductor is not destroyed. It has become. Further, the second dielectric 12 is provided with a pressing portion 21 at a portion corresponding to a position where it overlaps with the connecting portion 19 between the first central conductor 11 and the second central conductor 16 described above. The pressing portion 20 is
The second central conductor 16 is formed with grooves 20 of a predetermined length parallel to the end portions of the predetermined width of the connection portion 19 at two side portions in the width direction of the connection portion 19. It is a thing.

In addition, the pressing portion 21 includes the first and second center conductors 11, 1.
When the second dielectric 12 is pressed in the direction of the central conductor at the time of connection of 6, the pressing portion 21 is deformed and the first and second central conductors 11 and 16 are made conductive. Dielectric 1
It is sandwiched and fixed between 3 and 12.

In the connection structure of the transmission line configured as described above, when the triplate line 10 and the coaxial line 15 are connected, the connecting portion 19 of the second central conductor is superposed on the first central conductor 11,
The second dielectric 12 is sandwiched so as to cover the connection portion 19 between the first central conductor 11 and the second central conductor. At this time, since the second dielectric 12 is provided with the pressing portion 21 and has an elastic force, the pressing portion 21 of the second dielectric 12 is deformed by the thickness of the second central conductor 16. Then
The strain in the vertical direction is distorted in the horizontal direction.
At this time, the shape of the corner portion 20 is selected so that the void 22 is minimized. Further, since the second dielectric 12 has elasticity, it biases the second central conductor 16 in a direction in which the second central conductor 16 and the first central conductor 11 are overlapped with each other, so that the respective central conductors 1 can be reliably made.
1, 1 and 16 can be connected in a conductive state. Therefore, in such a connection structure, the first
Without forming a wide gap between the central conductor 11 and the second dielectric 12 of the first central conductor 11, the minimum groove 20, 20 necessary for the connection portion 19 of the first and second central conductors 11, 16 is formed. Since it is provided in the second dielectric 12, the matching compensation range at the time of impedance matching is limited to the connecting portion of each central conductor and the space portion, so that the matching compensation can be performed reliably and easily and is more stable than the conventional one. The obtained impedance can be obtained.

Further, in the above-mentioned embodiment, the case where the groove 20 is formed at two places for forming the pressing portion 21 on the second dielectric 12 is described, but as shown in FIG. The same effect can be obtained by forming one groove 20 of a predetermined length along the predetermined width of the same (FIG. 2 (b)).

Further, as shown in FIGS. 3 (a) and 3 (b), by providing the two through holes 20 in the second dielectric 12, the pressing portion 21 that is elastically deformed between the through holes 20, 20 is provided. It can be formed, and in this case, the same effect as that of the above-described embodiment can be obtained. In this case, since the pressing portion 21 can be formed only by penetrating the hole, the manufacturing process can be easily performed.

[Effects of the Invention] As described above, the transmission line connection structure according to the present invention has the first and second center conductors when the first center conductor and the second center conductor are sandwiched and fixed by the dielectric. The pressing portion formed on the second dielectric body corresponding to the overlapping position of is deformed by the thickness of the second center conductor, and thus an extra space is formed between the first dielectric body and the first center conductor. Since no air gap is generated, the impedance variation due to the air gap between the dielectrics and the impedance variation can be reduced by keeping the distance between the first central conductor and the outer conductor constant, and the matching compensation range at the time of impedance matching can be adjusted to each central conductor. There is an effect that it is possible to limit the space generated in the pressing portion, which is the joining portion of, and to perform matching compensation reliably and easily, and obtain stable impedance.

[Brief description of drawings]

FIG. 1 (a) is a side sectional view of a connection structure of a transmission line showing an embodiment of the present invention, and FIG. 1 (b) is A in 1 (a).
1A is a sectional view taken along line A-A, and FIG. 1C is a sectional view showing a connection structure of the transmission line in the embodiment, showing a state before assembly of the sectional view taken along line AA in FIG. FIG. 2D is a diagram showing the structure of the second dielectric, and FIG. 2A is a sectional view showing a state before assembly of a transmission line connection structure according to another embodiment of the present invention. 2B is a sectional view showing a connection state in FIG. 2A, FIG. 3A is a plan sectional view of a connection structure of a transmission line showing still another embodiment, and FIG. 3A is a sectional view taken along the line BB, FIG. 4A is a plan sectional view showing the connection structure of the transmission line of the conventional example, and FIG. 4B is a connection structure of the transmission line of the conventional example. FIG. 5 is a side sectional view showing a connection structure of a transmission line according to another conventional example, and FIGS. 6A and 6B are connection structure of a transmission line according to another conventional example. Is a diagram illustrating a. 10 ... Tri-plate line, 11 ... First central conductor, 12
... second dielectric, 13 ... first dielectric, 14 ... outer conductor,
15 ... Coaxial line, 16 ... 2nd center conductor, 19 ... Connection part of 2nd center conductor, 20 ... Groove (space part), 21 ... Pressing part, 22 ... Void.

Claims (1)

[Scope of utility model registration request] 1. A first dielectric (13) having a first central conductor (11) and a second dielectric (12) provided so as to cover the first central conductor (11), A triplate line (10) composed of a pair of outer conductors (14), (14), a second central conductor (16), and an outer portion provided concentrically with the second central conductor (16). In the connection structure of the transmission line for connecting the coaxial line (15) composed of the conductor (17), the second central conductor (16) has the first central conductor (11).
A connecting portion (1) which has a predetermined width and a predetermined length and is superposed on the top.
9) is provided so as to project, and the second dielectric (12) is made of an elastic material,
Moreover, the first central conductor (1
On the side facing the connection part (19) of 1), the connection part (19)
Is provided with a pressing portion (21) cut out by the predetermined length along the predetermined width, and the connecting portion (19) of the second central conductor (16) is provided on the first central conductor (11). Second dielectric in polymerized state (12)
Is pressed in the direction of the connecting part (19), the pressing part (21) is elastically deformed, and the connecting part (19) is pressed and fixed in the direction of the first central conductor (11). Transmission line connection structure.