JP2503885B2 - Cross dipole antenna - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross dipole antenna, and more particularly to the structure of a power feeding section.

[0002]

2. Description of the Related Art A cross dipole antenna is often used as one of omnidirectional antennas for mounting on a satellite because it is small and lightweight. As this type of satellite-mounted crossed dipole antenna, the one shown in FIG. 2 is conventionally known.

That is, in FIG. 2, this crossed dipole antenna is provided with 2 of 22 and 23 at the tip of a support mast 21.
Arrange the dipole antennas orthogonally in the same plane,
Two sets of coaxial balanced / unbalanced conversion circuits are provided in the support mast 21, and the support mast 21 is connected to the two sets of conversion circuits.
Two coaxial wires are exposed at the lower end of the, and 24 and 25 feeding coaxial connectors are attached to their ends. The two dipole antennas and the supporting mast are made by cutting aluminum alloy to reduce weight. Is being pursued.

[0004]

In the above-mentioned conventional crossed dipole antenna, two sets of coaxial type balanced-unbalanced conversion circuits, which are the feeding parts, are incorporated in the support mast, which complicates the structure and adjusts the assembly. There is a problem that it is difficult or troublesome.

The present invention has been made in view of the above problems, and an object thereof is to provide a crossed dipole antenna that simplifies the structure of the power feeding portion and enables easy and accurate assembly. is there.

[0006]

In order to achieve the above object, the crossed dipole antenna of the present invention has the following structure. That is, the crossed dipole antenna of the present invention is formed in a quadrangular prism shape, and has a support column on which rod-shaped radiating elements are erected on the tip sides of the four side surfaces, and two power supply poles provided on the lower end side of the support column. A dielectric support part having a coaxial connector; a power supply board part attached to each of two adjacent side surfaces of the support pillar; and the power supply board part attached to the surface of the dielectric substrate and the attachment part. Feeding line patterns are formed on the respective backsides, the lower ends of the feeding line patterns on the front and back surfaces are connected to the corresponding ones of the two feeding coaxial connectors, and the upper ends of the feeding line patterns on the front surface are pasted on the back side. Connected to a rod-shaped radiating element that is erected on the side surface of the supporting column to be attached, and the upper end of the feed line pattern on the back surface is connected to a rod-shaped radiating element that is erected on the side surface of the supporting column facing the side surface of the supporting column. Featuring Is shall.

[0007]

Next, the operation of the crossed dipole antenna of the present invention constructed as described above will be described. Two separate power supply board parts or a power supply board part bent at the center of the width at a right angle to the back side are attached to two adjacent side surfaces of the support pillar of the dielectric support part. Then, the power supply line patterns on one of the front and back surfaces are connected at their lower ends to one of the two power supply coaxial connectors, and the upper ends of the power supply line patterns on the front surface are erected on the side surfaces of the support pillar to which the back surface is attached. Connected to the rod-shaped radiating element, and the upper end of the feed line pattern on the back surface is connected to the rod-shaped radiating element erected on the side surface of the supporting column facing the side surface of the supporting column. That is, the power feeding portion for one dipole antenna is formed. The same thing is done for the other feed line patterns on the front and back sides to form a feed part for another dipole antenna.

This completes the assembly of the desired crossed dipole antenna, but since the feed line pattern can be formed with accurate position dimensions, it can be assembled easily and accurately.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a crossed dipole antenna according to an embodiment of the present invention. This crossed dipole antenna has a dielectric support portion (FIG. 1A) and a power feeding substrate portion (FIG. 1B).
Composed of and.

In FIG. 1 (a), a support column 1 is a dielectric rod formed in a quadrangular prism shape, and its lower end is fixed on a base 2. On the tip side of the support column 1, rod-shaped radiating elements (3a, 3b, 3c, 3d) are erected on each of four side surfaces, and one pair of opposing side surfaces of the four side surfaces communicate with each other. A hole 4 is provided. In addition, the base 2 has 5
Two power supply coaxial connectors a and 5b are attached,
The center conductor and the outer conductor are taken out in the vicinity of the surface of the side surface of the support column 1 where the hole 4 is provided and the adjacent side surface.

In FIG. 1 (b), the dielectric substrate 6 has metal foils formed on its front and back surfaces by adhesion or vapor deposition. The metal foils on the front and back surfaces are etched to remove the metal foil on both sides of the widthwise center in the lateral direction. The surface patterns (7a, 7b) and the back surface patterns (8a, 8), which are feeding line patterns, are accurately positioned on the front and back surfaces
b) has been formed.

The front surface patterns (7a, 7b) are elongated strip-shaped patterns, while the back surface patterns (8a, 8b) are
The ground pattern includes a ground pattern that covers from the lower end of the surface pattern to a portion close to the upper end, and an elongated strip pattern that is connected to the ground pattern and extends further upward from the upper end of the surface pattern.

It is well known that if the relationship between the width and the length of the belt-shaped patterns on the front and back surfaces is appropriately set, the same effect as that of the conventional coaxial balanced-unbalanced conversion circuit can be achieved. A ground pattern is always required for each, and as a result, the band-shaped pattern connected to the ground pattern extends further upward from the upper end of the surface pattern. It was realized with a simple configuration. The assembly method will be described below.

In the above structure, as shown in FIG. 1C, the substrate of the portion extending further upward from the upper end of the front surface pattern (7a, 7b) is left with the strip pattern portion of the back surface pattern (8a, 8b). The dielectric substrate 6 thus cut off is bent at the center of the width thereof at a right angle to the back surface side.

Then, as shown in FIG. 1D, the dielectric support portion 9 is attached to two adjacent side surfaces of the support pillar, and the feeding line pattern on the front and rear surfaces is provided with the feeding coaxial connector and four. A crossed dipole antenna is completed by connecting to a rod-shaped radiating element.

Specifically, in connecting the front and back feed line patterns to the coaxial connector, the surface pattern 7a (7b) is used.
Is connected to the center conductor of the coaxial connector 5a (5b), and the lower end of the back surface pattern 8a (8b) (lower end of the ground pattern) is connected to the outer conductor of the coaxial connector 5a (5b).

Further, in connecting the front and back feed line patterns to the rod-shaped radiating element, the upper end of the surface pattern 7a (7b) is erected on the side surface of the support pillar to which the back surface is attached. ), The backside pattern 8a
Is connected to the base of the rod-shaped radiating element 3c which is pushed out through the hole 4 to the side surface of the supporting pillar facing the supporting pillar side surface, and the upper end of the back surface pattern 8b is beyond the head of the supporting pillar 1 It is connected to the base of the rod-shaped radiating element 3b which is taken out and is erected there.

That is, the feeding board portion 10a on which the front and back patterns 7a and 8a are formed forms a feeding portion for one dipole antenna 3c and 3d, and the front and back patterns 7b and 8b are formed. Board part 10b
Forms a feeding part for another dipole antenna composed of 3a and 3b.

As described above, the cross dipole antenna can be assembled very easily and accurately.

In the above description, the power supply board portion is used by bending one dielectric board in consideration of an actual application scene, but two separate dielectric boards are used. Needless to say, the power supply board section may be configured.

[0021]

As described above, in the crossed dipole antenna of the present invention, the feeding portion is composed of the feeding line pattern formed on the dielectric substrate, and the feeding line pattern is connected to the radiating element and the coaxial connector. Therefore, there is an effect that it is possible to assemble easily and accurately.

[Brief description of drawings]

FIG. 1 shows a configuration of a crossed dipole antenna according to an embodiment of the present invention, (a) is a perspective view of a dielectric support portion,
(B) is a plan view of the power supply board, (c) is a perspective view of the power supply board in a molded state, and (d) is a perspective view of a completed assembly state.

FIG. 2 is a perspective view of a conventional cross dipole antenna.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support pillar 2 Bases 3a-3d Rod-shaped radiating element 4 Holes 5a, 5b Coaxial connector for feeding 6 Dielectric substrate 7a, 7b Surface pattern 8a, 8b Backside pattern 9 Dielectric supporting portion 10a, 10b Feeding substrate portion

Claims (2)

(57) [Claims] 1. A support column, which is formed in a quadrangular prism and has rod-shaped radiating elements erected on the respective tip sides of four side faces, and two power supply coaxial connectors provided on the lower end side of the support column. A dielectric support portion; two adjacent support pillars
And a power feeding substrate portion adhered to each of the two side surfaces, wherein the power feeding substrate portion has a power feeding line pattern formed on a front surface of the dielectric substrate and a back surface which is a bonding surface, and a power feeding line pattern on a front surface side. Is connected to the corresponding one of the two feeding coaxial connectors, and the upper end of the feeding line pattern on the front surface is connected to the rod-shaped radiating element standing on the side surface of the supporting column to which the back surface is attached. The upper end of the feed line pattern is connected to a rod-shaped radiating element that is erected on the side surface of the supporting column facing the side surface of the supporting column. 2. The crossed dipole antenna according to claim 1, wherein the feeding substrate portion is a dielectric substrate having feeding line patterns formed on the front and back surfaces on both sides of the widthwise center in the horizontal direction. A crossed dipole antenna characterized by being bent at a right angle to the side.