JPH0628811Y2 - Dipole antenna with connector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> 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.

<Prior Art> As is well known, in a phased array antenna, a plurality of, for example, dipole antennas are 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.

As a dipole antenna with a connector used for such a phased array antenna, there is one as shown in FIG. In the figure, 1 is an antenna base, 2 is a connector housing, 3 is a coupling nut integrally formed with a reflector 4, 5 is a retainer ring, 6 is a gasket,
Reference numeral 7 is a cylindrical insulator, and 8 is a rod-shaped central 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 body 1 is obtained by processing what is called a so-called semi-rigid cable. The antenna base body 1 is half-divided from the upper end to the middle and is bent outward so that the upper half-divided portions face each other by 180 degrees. From an outer conductor 1a made of a V-shaped metal pipe, an insulator 1b such as Teflon inserted into the cylindrical portion of the outer conductor 1a, and a linear inner conductor 1c inserted through the center of the insulator 1b. Become. The overhanging piece 1d of the outer conductor 1a has a bow-shaped cross section. Further, the upper end of the inner conductor 1c is soldered to the one overhanging piece 1d of the outer conductor 1a, and the lower end thereof is electrically connected to a rod-shaped central conductor 8 penetrating the center of the insulator 7.

The connector housing 2 is of 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 lower large diameter portion of the. This connector housing 2
The upper end surface of is formed as a reflecting surface capable of reflecting radio waves.

The coupling nut 3 is of a cylindrical shape that is externally fitted and coupled to the outer periphery 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 integrally formed at the upper end thereof. Has been 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 upwardly the radio waves emitted downward from the overhanging piece 1d of the antenna base 1. is there.

The retainer ring 5 is formed by separating one portion of the circumference, and has a circumferential groove formed on the outer circumference of the connector housing 2.
The connector nut 2 and the coupling nut 3 are rotatably connected to each other by being mounted so as to straddle a circumferential groove formed on the inner circumference of the coupling nut 3.

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

In the dipole antenna with a connector having such a structure, a characteristic impedance Z ₀ having 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, the outer diameter dimension of the central conductor 8. Is set to.

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

Regarding the former joining state, it is desirable that the solder 9 is completely permeated into the fitting portion between the antenna base body 1 and the inner hole of the connector housing 2, but if the permeation of the solder 9 is insufficient and a gap is present, Since the inductance component is included, the radio wave emitted from the antenna base 1 is attenuated. Regarding the latter dimensional variation, the distance d ₁ between the lower surface of the overhanging piece 1d of the antenna base 1 and the upper surface of the reflector 4 and the lower surface of the overhanging piece 1d of the antenna base 1 over the connector housing 2 It is desirable to make the distance d ₂ to the end face the same dimension so as to be flush with each other, but the distances d ₁ and d ₂ may be incorrect, or the difference between the distances d ₁ and d ₂ may vary. Then, the reflected wave influences the traveling wave emitted upward from the antenna substrate 1, and the spread of the radio wave of the emitted radio wave occurs.

<Problems to be Solved by the Invention> 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 body 1 and the connector housing 2, the joined state is likely to be incomplete.

In addition, since the relative positions of the antenna base 1 and the connector housing 2 may be displaced during the soldering, and the separation distance d ₂ tends to vary from product to product, the separation distances d ₁ and d
₂ is unlikely to be equal.

As described above, in the conventional dipole antenna with a connector, since the antenna base body 1, the connector housing 2, and the reflection plate 4 are separate components, it is difficult to manufacture an antenna having desired performance. Yes, the production yield was poor.

Further, it is pointed out that since the antenna base 1 is formed by a hollow pipe, the strength of the overhanging piece 1d having an arcuate cross section is insufficient, and the parallelism is likely to be deviated due to an error in the bending angle. .

The present invention was created in view of such circumstances,
An object of the present invention is to provide a dipole antenna with a connector having a structure with stable performance and a structure that can be easily manufactured.

<Means for Solving the Problems> In order to achieve the above object, the present invention provides a dipole antenna with a connector provided in a phased array antenna that emits a radiation directivity radio wave beam in an arbitrary direction of a space. 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 emission direction control provided on the outer periphery of the connector housing so as to be rotatable relative to each other. And a coupling nut to which the connector of the phase shifter or the extension cable is attachable / 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, The coupling nut and the reflection plate are integrally formed, and the antenna base and the connector housing are integrally formed.

<Operation> When the antenna base and the connector housing are formed as an integral structure, there is no joint surface between them, and there is no concern that the jointed state will be insufficient as in the conventional example in which both are soldered. Further, since the antenna base is a structure unlike a metal pipe, the overhanging piece of the antenna base is particularly robust and the parallelism can be achieved with high accuracy, and the distance between the overhanging piece of the antenna base and the upper end surface of the connector housing is the product. It does not vary from time to time.

<Example> Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

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

In this embodiment, the configuration different from the conventional example is that the antenna base 1 and the connector housing 2 are made of an integral structure. The antenna base 1 has a structure in which a cylindrical insulator 1b is inserted into the inner hole of a substantially T-shaped outer conductor 1a, and a rod-shaped inner conductor 1c is inserted into the center of the 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.
Therefore, there is no joint surface between the antenna base 1 and the connector housing 2, and there is no fear of a joint failure that may occur in the past, and moreover, the protruding piece 1 of the antenna base 1 is not present.
The intensity of d is higher than that of the conventional one, and the parallelism can be set with high accuracy.

Therefore, in the dipole antenna 10 with a connector of the present embodiment, the distance d ₂ between the projecting piece 1d of the antenna base 1 and the upper end surface of the connector housing 2 should be fixed to a predetermined value without varying from product to product. You can
The distance d ₁ from the overhanging piece 1d of the antenna base 1 to the reflected wave 4 is set to be equal to the distance d _{2 in} consideration of rattling around the retainer ring 5.

<Advantages of the Invention> As described above, according to the present invention, since the antenna base and the connector housing are formed as an integrated structure, it is possible to manufacture the above-mentioned components separately and connect them with solder or the like. In comparison, it is possible to reduce the number of steps in which a manufacturing error intervenes, which makes it easy to keep the antenna performance constant and improve the manufacturing yield.

In particular, the joint surface between the antenna base and the connector housing is eliminated, and the distance between the overhanging piece of the antenna base and the connector housing becomes constant, so that 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 a conventional example, and FIG. 2 is a partial sectional view of a dipole antenna with a connector according to an embodiment of the present invention. 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. And a reflection plate mounted flush with the reflection plate of the phased array antenna, the coupling nut and the reflection plate are integrally formed, and the antenna base and the connector housing are integrally structured. Connector characterized by consisting of You can dipole antenna.