JPS6388902A - Strip line feeder - Google Patents

Abstract

PURPOSE:To obtain a feeder with less transmission loss by providing a conductor member connected to an outer conductor, having a distance being 1/2 of the surface wave generated in the vicinity of the feeding point and placing the feeding point in the range formed by tying them. CONSTITUTION:A strip line 4 being a center conductor is formed to the upper face of the center base 3 and formed between outer conductors 1, 2 via dielectric layers 5, 6. One end of the feeder pin 7 is connected to the feeding point 4a of the strip line 4 by solder 10. The metal-made screw 15 is screwed to a through hole 11a formed to a connector 11. In arranging the screw 15 at a position where the distance between the screws 15 is <=1/2 the surface wave generated in the vicinity of the feeding point 4a, the transmission characteristic is improved.

Description

Detailed Description of the Invention [Technical Field] The present invention relates to a stripline power supply device that supplies power from another transmission path such as a coaxial line or a waveguide to a stripline formed as a center conductor of a substrate with a triplate structure. Regarding.

(Background Art) Conventionally, when power is supplied from the vertical direction to the board with this type of power supply device, as shown in FIG. 7, two outer conductors A,
A strip line F formed on the center substrate E of the tri-plate structure consisting of the center substrate E sandwiched between B and dielectrics F5C and D is connected to other external coaxial lines or waveguides, etc. When feeding power from a transmission line, pass the power supply pin G through a through hole H that is sufficiently larger than the power supply pin G formed on the side of one of the outer conductors, and then through a through hole I formed on the center board E that has approximately the same diameter as the power supply pin G. By connecting the feed pin G and the strip line F with solder J, the strip line F is electrically connected to other transmission lines. Power supply pin G
uses a core wire in the connector, and is fixed to the outer conductor B in the connector. In this case, discontinuity in the electromagnetic field distribution becomes large near the feeding point, and reflection of electromagnetic waves occurs. In addition, when the thickness of the dielectric layers C and D is large or when the dielectric layer C2D
When the dielectric constant of is small, transmission loss increases due to the generation of other transmission modes such as surface waves, and there is a drawback that good transmission characteristics cannot be obtained. In particular, the transmission loss due to the generation of surface waves has a positive correlation with the thickness of the dielectric NC2D and a negative correlation with the dielectric constants of the dielectric layers C and D. In the structure, the dielectric constant of air is small, and the transmission loss will increase significantly.

[Purpose of the invention]

The present invention has been made in view of the above points, and an object thereof is to provide a stripline power supply device with small transmission loss in a stripline having a triplate structure.

[Disclosure of the invention]

The strip line power supply device of the present invention includes two outer conductors, a center conductor sandwiched between the outer conductors via a dielectric layer, and a power supply that passes through the one outer conductor and supplies power to a power supply point of the center conductor. A strip line feeding TL device with a triplate structure, which is configured to include a power feeding pin and to feed power through the feeding pin, is made of three or more rod-shaped conductive materials, connected to at least one of the outer conductors, and connected to the dielectric material. A conductive member is provided in both layers, the distance between each layer is approximately 1/2 or less of the surface wave generated in the vicinity of the feeding point, and the feeding point is located in the range formed by connecting each layer. This provides a stripline power supply device with low transmission loss.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 6.

1.2 is a grounded outer conductor with a shielding function.

If a slit is formed in this outer conductor 1.2, it also functions as a radiator. Reference numeral 3 denotes a center substrate, on the upper surface of which a strip line 4 serving as a center conductor is formed, and is placed between outer conductors 1.2 with a dielectric layer 5.6 interposed therebetween. The dielectric layers 5 and 6 may be air layers. (In this case, a suspended structure is formed.) If the dielectric layer 5.6 is not an air layer, the strip line 4 may be formed by direct etching on the lower or upper surface of the dielectric layer 5.6. Reference numeral 7 denotes a power supply pin, one end of which passes through a through hole 8 having a diameter sufficiently larger than the diameter of the power supply pin 7 formed in the outer conductor 2, and the diameter of the power supply pin 7 formed in the dielectric layer 6 and the center substrate 3. It passes through a through hole 9a having approximately the same diameter as , and is connected to the power feeding point 4a of the strip line 4 by solder lO. The other end of the power supply pin 7 is connected to a transmission line such as a coaxial cable or a waveguide. When the transmission line is a coaxial cable, the connection is generally made through a connector 11 as shown in FIG. 1, and the power supply pin 7 may also be used as the core wire of the connector 11. When the transmission line is a waveguide 12, the connection is made using the waveguide 12 as shown in FIG.
The power supply pin 7 is inserted into and connected.

Note that the outer periphery of the power supply pin 7 is generally covered with a dielectric material 13, 14 such as Teflon;
．． 14 may be omitted.

15 is a rod-shaped conductive member, which is a metal screw.

Note that this is not limited to screws, but may be anything that is rod-shaped and conductive, such as a metal pin or a metal bar. The metal screws are attached by passing the metal screws 15 through the through holes 11a formed in the connector 11, the screw holes 2a formed at positions corresponding to the through holes 11a of the outer conductor 2 and the center board 3, and the through holes 3a, and fixing them with screws. . The formation position of the screw hole and the through hole, that is, the installation position of the metal screw 15 is as shown in FIG.
Four metal screws 15 are installed around a. Furthermore,
Each metal screw 15 is installed over the entire thickness of the dielectric layer 5.6. The quadrangle formed by connecting the four metal screws 15 surrounds the feeding point 4a, and the distance between the four metal screws 15 is 'In' 2* r 3 + r 4
are all approximately 1/2 or less of the wavelength λS of the surface wave generated in the vicinity of the feeding point 4a. Furthermore, metal pin 15
The positional relationship in the length direction is not necessarily as shown in Figure 4(a).
As shown in FIG. 4, it is not necessary to install the dielectric layers 5 and 6 over the entire thickness direction, and as shown in FIG. The dielectric layers 5 and 6 may be partially chipped, as shown in FIG. 3(d).

What is important here is that the metal screws 15 are made of three or more rod-shaped conductive materials, are connected to at least one of the outer conductors 1.2, are present in both dielectric layers 5.6, and are The distance between the metal screws 15 is approximately 1/2 or less of the wavelength λS of the surface wave generated in the vicinity of the feeding point 4a, and the feeding point 4a is located in the range formed by connecting the metal screws 15.

In the above embodiment, power is supplied from the center of the strip line 4, but when power is supplied from the end of the strip line 4, the metal screws 15 are arranged as shown in FIGS. 5(a) and 5(b). (Experimental Example) Next, an experimental example of the above embodiment will be shown.

FIGS. 6(a) to 6(e) show the installation positions of the metal screws 15, the distance relationship between the metal screws 15, and the transmission characteristics of transmitted power corresponding thereto. Here, the positional relationship in the length direction of the metal pin 15 is such that it extends over the entire thickness direction of the dielectrics N5 and N6, as shown in FIG. 4(a). Further, the wavelength λS of the surface wave generated near the feeding point 4a is 30 mm.

As can be seen from this experimental example, in the cases of Figures 6(a) and (d), the transmitted power increases compared to the conventional example, but in other cases, the transmitted power is approximately the same as the conventional example. I can't do it. That is,
The range formed by connecting the metal screws 15 (the part surrounded by thick lines in the figure) surrounds the power feeding point 4a, and the metal screws 1
Transmitted power transmission characteristics are obtained only when the metal pins 15 are placed at positions where the distances between the metal pins 15 are approximately 1/2 (15 mm) or less of the wavelength λS of the surface waves generated near the feeding point 4a. This has the effect of improving transmission loss (reducing transmission loss).

〔Effect of the invention〕

As described above, according to the present invention, there are two outer conductors, a center conductor sandwiched between the outer conductors via a dielectric layer, and power passing through the one outer conductor to the power feeding point of the center conductor. In a strip line power supply device having a triplate structure, comprising a power supply pin and a power supply pin, the strip line power supply device has a tri-plate structure and is configured to supply power through the power supply pin.
both are connected to either of the outer conductors, are present in both of the dielectric layers, the distance between each is approximately 1/2 or less of the surface wave generated near the feeding point, and is formed by connecting each. Since a conductive member for locating a feeding point within the range was provided, a stripline power feeding device with reduced transmission loss could be provided.

[Brief explanation of the drawing]

1 to 6 show one embodiment of the present invention. FIG. 1 is a cross-sectional view thereof, FIG. 2 is a cross-sectional view of the connector shown in FIG. 1 as a waveguide, and FIG. 3 is a plan view of the one in FIG. 1, FIG. 4 is a schematic diagram showing various modifications of the conductive member, and FIGS. 5(a) and (b) are: FIG. 6 is a schematic diagram in the case of end feeding; FIG. 6 is a characteristic diagram showing an experimental example; FIG. 7 is a sectional view showing a conventional example. 1.2--Outer conductor, 3-Center board, 4-Strimb line (center conductor), 4a-Feed point, 5.6--Dielectric layer, 7--Power supply pin, 15--Conductivity Parts patent applicant: Matsushita Electric Works Co., Ltd. Agent: Patent attorney Toshimaru Takemoto (and 2 others) Figure 1, 10, Figure 2, Figure 3 (C) (d) Figure 5 (a), Figure 7 EJ

Claims (1)

[Claims] (1) Consisting of two outer conductors, a center conductor sandwiched between the outer conductors via a dielectric layer, and a power supply pin that passes through the one outer conductor and supplies power to the power supply point of the center conductor,
In the stripline power supply device having a triplate structure, in which power is supplied through the power supply pin, the stripline power supply device is made of three or more rod-shaped conductive materials, is connected to at least one of the outer conductors, and is present in both of the dielectric layers. , the strip is characterized in that the distance between each is approximately 1/2 or less of the surface wave generated in the vicinity of the feeding point, and a conductive member is provided for locating the feeding point in the range formed by connecting the strips. Line power supply device.