JPH0720964Y2 - Dipole antenna with connector - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dipole antenna with a connector provided in a phased array antenna that emits a radiation-directed radio wave beam in an arbitrary direction in space.

[0002]

2. Description of the Related Art As is well known, a phased array antenna has a plurality of, for example, dipole antennas erected regularly (for example, in a horizontal row or in a matrix) on a reflector, and a phase shifter is provided for each dipole antenna. Each phaser is electrically connected individually, and the signal source is connected to each phaser via a feed line of equal length.By controlling the phase of each phaser individually by a microcomputer, The direction in which the radio wave is emitted can be changed arbitrarily. A connector is attached to the dipole antenna, and a connector that fits with the connector is also attached to the phase shifter. The dipole antenna and the phase shifter can be attached and detached by a pair of connectors. It is supposed to be connected.

FIG. 2 shows a dipole antenna with a connector used for such a phased array antenna. In the figure, 1 is an antenna base, 2 is a connector housing, 3 is a coupling nut in which a reflection plate 4 is integrally formed, 5 is a retainer ring, 6 is a gasket, 7 is a cylindrical insulator, 8 is a rod-shaped center. It is a conductor.
The antenna base 1, the insulator 7, and the central conductor 8 form an antenna, and the connector housing 2, the coupling nut 3, the retainer ring 5, and the gasket 6 form a connector.

The antenna base 1 is obtained by processing what is called a so-called semi-rigid cable, and is half-divided from the upper end to the middle and the upper half is 18-divided.
An outer conductor 1a made of a T-shaped metal pipe that is bent outward so as to face each other at 0 degrees, and this outer conductor 1
Insulator 1b such as Teflon inserted in the cylindrical part of a
And a linear inner conductor 1c penetratingly inserted into the center of the insulator 1b. The overhanging piece 1d of the outer conductor 1a has a bow-shaped cross section. Also, the inner conductor 1
The upper end of c is soldered to one overhanging piece 1d of the outer conductor 1a, and the lower end is electrically connected to a rod-shaped central conductor 8 penetrating the center of the insulator 7.

The connector housing 2 has a cylindrical shape having an inner hole penetrating vertically, and the lower end portion of the antenna base 1 is fitted into the upper small diameter portion of the inner hole and joined by solder 9. An insulator 7 penetrating the center conductor 8 is fitted in the large-diameter portion below the inner hole. The upper end surface of the connector housing 2 is formed as a reflection surface capable of reflecting radio waves.

The coupling nut 3 is of a cylindrical shape that is externally fitted and connected to the outer circumference of the connector housing 2 so as to be relatively rotatable, and has a flange-shaped reflecting plate 4 extending outward in the radial direction at its upper end. Are integrally formed. The coupling nut 3 is screwed to a connector 11 of a radio wave emission direction controlling phaser (not shown) provided in the phased array antenna via a threaded portion formed at the lower end of the inner hole. The antenna base 1 is electrically connected to the phase shifter (not shown) via the inner conductor 1c and the center conductor 8.

The reflector 4 is mounted flush with the reflector 12 provided in the phased array antenna, and reflects the radio waves emitted downward from the overhanging piece 1d of the antenna base 1 upward. To do.

The retainer ring 5 is formed by separating one portion of the circumference, and extends over a peripheral groove formed on the outer periphery of the connector housing 2 and a peripheral groove formed on the inner periphery of the coupling nut 3. The connector housing 2 and the coupling nut 3 are rotatably connected to each other by being attached.

The gasket 6 is composed of a rubber ring or the like adhered to the lower end surface of the connector housing 2, and when the connector 11 is mounted on the coupling nut 3,
The connector housing 2 and the connector 11 are sandwiched between the abutting portions to seal the abutting portions.

In the dipole antenna with a connector having such a structure, a characteristic impedance Z _{0 of} a desired value is obtained based on factors such as the dielectric constant of the insulator 7, the outer diameter dimension of the insulator 7 and the outer diameter dimension of the central conductor 8. Is set to have.

The manufactured dipole antenna with a connector having the above structure is tested to see if the voltage standing wave ratio (VSWR) is within a desired range, thereby determining the quality of the product. This voltage standing wave ratio is
It changes depending on the bonding state of the antenna base 1 and the connector housing 2 with the solder 9 and the variation in the dimension from the protruding piece 1d of the antenna base 1 to the reflector.

Regarding the former joining state, it is desirable to completely permeate the solder 9 into the fitting portion between the antenna base 1 and the inner hole of the connector housing 2, but the permeation of the solder 9 is insufficient and a gap is formed. If it intervenes, it will contain an inductance component, and the radio wave emitted from the antenna base 1 will be attenuated. As for the latter variation in size, from the bottom surface of the overhanging piece 1d of the antenna base 1 to the reflection plate 4
The distance d ₁ to the upper surface, it is desirable to both flush the same size and distance d ₂ from the lower surface of the overhanging strips 1d of the antenna substrate 1 to the upper end surface of the connector housing 2, separated The distances d ₁ and d ₂ are out of order, or d ₁
If there is a difference in the difference between the separation distances of d ₂ and d ₂ , the reflected wave becomes
The traveling wave that is emitted upward from the antenna base 1 is affected, and the radio wave beam of the emitted radio wave is spread.

[0013]

The conventional dipole antenna with a connector described above has the following disadvantages.

Since it is not possible to visually confirm whether or not the solder 9 has penetrated into every corner of the fitting portion between the antenna base 1 and the connector housing 2, the joining state is likely to be incomplete.

In addition, at the time of the soldering, the antenna substrate 1
Since the relative position between the connector housing 2 and the connector housing 2 may be misaligned and the separation distance d ₂ tends to vary from product to product, the separation distances d ₁ and d ₂ are unlikely to be equal.

As described above, in the conventional dipole antenna with a connector, the antenna base 1, the connector housing 2, and the reflector 4 are separate components, so that an antenna having desired performance can be manufactured. However, the production yield was poor.

Further, it is pointed out that the antenna base 1 is formed of a hollow pipe, so that the strength of the overhanging piece 1d is insufficient, and the parallelism is likely to change due to an error in the bending angle.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a dipole antenna with a connector having a stable performance structure and a structure which can be easily manufactured.

[0019]

In order to achieve the above-mentioned object, the present invention provides a dipole antenna with a connector provided in a phased array antenna for emitting a radiation-directed radio wave beam in an arbitrary direction in space as follows. Take a different configuration.

The dipole antenna with a connector of the present invention is a T-shaped antenna base, a connector housing provided on the outer periphery of the lower end of the antenna base, and a radio wave provided on the outer periphery of the connector housing so as to be rotatable relative to each other. Equipped with a coupling nut to which a phase shifter for controlling the emission direction or a connector of an extension cable is attachable and detachable, and a reflection plate which is provided on the outer periphery of the upper end side of the connector housing and which is attached flush with the reflection plate provided in the phased array antenna. Moreover, the antenna base body, the connector housing, and the reflection plate are integrally formed.

[0021]

According to the present invention, there is no joining surface between the antenna base and the connector housing, and the joining state is not insufficient unlike the conventional example. Since the antenna body is a structure unlike the metal pipe, especially the overhanging piece of the antenna body is robust and the parallelism can be accurately achieved. Further, since the upper end surface of the connector housing and the upper end surface of the reflection plate are flush with each other, the respective separation distances from the protruding piece of the antenna base to the upper end surface of the connector housing and the upper end surface of the reflection plate are equal.

[0022]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In this figure, the same symbols as those in FIG. 2 of the conventional example indicate corresponding parts and portions, and detailed description thereof will be omitted.

In this embodiment, the structure different from the conventional example is that the antenna base 1, the connector housing 2 and the reflector 4 are provided.
And is an integral structure. Antenna base 1
The portion corresponding to (1) has a structure in which a cylindrical insulator 1b is inserted into the inner hole of the T-shaped outer conductor 1a, and a rod-shaped inner conductor 1c is inserted into the center of this insulator 1b. The upper end of the inner conductor 1c is joined to the upper end portion of the inner hole of the outer conductor 1a by soldering or the like.

The integrated structure is obtained by processing a metal material with, for example, a lathe or a milling machine, and the antenna base 1 and the connector housing 2 are provided.
There is no joint surface between the connector housing 2 and the reflection plate 4. Therefore, there is no fear of a defective joint between the antenna base body 1 and the connector housing 2 which may occur in the past. In addition, the protruding piece 1 of the antenna base 1
Regarding d, since the cross section can be rectangular, the strength can be increased, and the parallelism can be set easily and with high accuracy as compared with the conventional case.

Therefore, in the dipole antenna 10 with a connector of this embodiment, the upper end surface of the connector housing 2 and the upper end surface of the reflector 4 can be flush with each other, so that the connector 1 is extended from the overhanging piece 1d of the antenna base 1. The distance d ₂ to the upper end surface of the housing 2 and the antenna base 1
The separation distance d ₁ from the overhanging piece 1d to the reflection plate 4 can be made constant to a predetermined value without varying from product to product.

[0027]

As described above, according to the present invention,
Since the antenna base, the connector housing, and the reflector are formed as an integrated structure, the number of steps in which a manufacturing error intervenes can be reduced as compared with the conventional example in which the above-mentioned parts are manufactured separately and then combined. Therefore, it is easy to make the antenna performance constant, the manufacturing yield can be improved, and the number of parts and the number of assembling steps can be reduced to reduce the manufacturing cost.

Specifically, the joint surface between the antenna base and the connector housing is eliminated, and the distance between the protruding piece of the antenna base and the connector housing becomes constant, so that the antenna performance can be stabilized. Become.
In addition, the distances from the overhanging piece of the antenna substrate to the connector housing and the reflector are equal, and the antenna performance can be stabilized.

[Brief description of drawings]

FIG. 1 is a partial sectional view of a dipole antenna with a connector according to an embodiment of the present invention.

FIG. 2 is a partial sectional view of a dipole antenna with a connector according to a conventional example.

[Explanation of symbols]

 1 Antenna Base 1a Outer Conductor 1d Overhanging Piece 2 Connector Housing 3 Coupling Nut 4 Reflector

Claims (1)

[Scope of utility model registration request] 1. A dipole antenna with a connector provided in a phased array antenna for emitting a radiation-directed radio wave beam in an arbitrary direction in space, the antenna base having a T-shape, and a connector provided on an outer periphery of a lower end side of the antenna base. The housing and the connector housing are provided rotatably on the outer periphery of the connector housing, and the phase shifter for controlling the radio wave emission direction provided on the phased array antenna or the coupling nut to which the connector of the extension cable is detachable are provided on the outer periphery of the upper end side of the connector housing. A dipole with a connector, comprising: a reflector plate mounted flush with a reflector plate of the phased array antenna; and the antenna base body, a connector housing, and the reflector plate are formed as an integral structure. antenna.