JP2519424Y2 - Wireless direction finding antenna device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio direction detecting antenna device which is used by being mounted on a ground, on a rooftop, or on a mast of a ship, at a high place.

[0002]

Discone antennas are mainly V
Since it is used for the HF / UHF band, it is often used by being installed in a high place with good visibility. In particular, when used as an auxiliary antenna of a wireless direction finding device (for example, in a Doppler type direction finding device, an omnidirectional antenna used for FM modulation cancellation and communication sound reception), the direction finding antenna is used. It is used by equipping the highest part (top) of the pillar equipped with the middle.

As a discone antenna, for example,
According to Antenna Engineering Handbook (published by Ohmsha in 1980), the disk-shaped electrode placed on the top is the upper antenna element, and the cone-shaped (cone-shaped) electrode placed on the lower side of the center is the lower antenna element. , The coaxial feed line with the center point of the upper antenna element as an output terminal, for example, the core wire of the coaxial cable, and the conical apex of the lower antenna element as the connection side terminal to the outer shield wire of the coaxial cable. It is well known that each of them is connected to form a feeding line. Further, it is well known that one or both of the upper antenna element and the lower antenna element of the discone antenna described above are formed in a similar manner by a radial linear group.

[0004]

As described above, in the case of a radio direction finding antenna device installed at a high place, a lightning strike causes reception of the radio direction finding device using this radio direction finding antenna device. There is a problem that the circuit is destroyed. In addition to the antenna at the top of the pillar,
There is a problem that even the antennas in the middle part are affected and all the antennas are destroyed. For this reason, a method has been adopted in which a lightning rod tower is set up near the antenna to avoid damage caused by lightning strikes. This method has a problem that the directional characteristics of each antenna are obstructed and a large direction finding error occurs.

[0005]

According to the present invention, the output terminal of the lower antenna element of the discone, that is, the lower output terminal is connected to the core side of the coaxial feed line to output the output of the upper antenna element. The terminal, that is, the upper output terminal is connected to the outer shield of the coaxial feed line so that the connection is completely opposite to the feed line of the conventional discon antenna, and the lightning rod is placed at the center of the upper side of the upper antenna element. Is provided and the means for connecting this to the grounding conductor can solve the above problems.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described below with reference to the drawings. FIG.
Is an embodiment in which a plurality of radio direction finding antennas assigned to each frequency band group and their auxiliary antennas are arranged vertically in a column on one column. In the figure, the column 1 is a lower column. 1A, middle stanchion 1B, upper stanchion 1
In order to avoid the antenna 5 for detecting the mid-range frequency band direction, which is mainly composed of C and is arranged between the upper column 1C and the middle column 1B, and to connect the columns 1C and 1B above and below, In order to attach a plurality of studs 1E arranged in a cage shape between the flanges 1C1 and 1B2 of each strut, and a low frequency band direction finding antenna 6 to be described later, which is arranged beside the middle strut 1B and the lower strut 1A. , And an overhanging flange 1D disposed between the flanges 1B1 and 1A2 of the upper and lower columns.

[0007] Then, the column 1A and the projecting flange 1D
Is a steel material mainly for strength, the pillar 1B is an aluminum material for a light weight, and the pillars 1C and the studs 1E are high-frequency insulating materials mainly for avoiding influence on direction detection error, for example, glass fiber It is made of polyester-based synthetic resin material and fixed with screws. Upper column 1C
An antenna 4 for detecting a high frequency band, which will be described later, is arranged on the upper side of, and an auxiliary antenna 3 for a high / middle frequency band, which is described later, is further arranged on the upper side of the antenna. An auxiliary antenna 7 for middle / low frequency band is arranged.

Explaining each direction detecting antenna, the high frequency band direction detecting antenna 4 is mainly composed of an antenna group in which the cone type dipole antenna 4E is arranged in the vertical direction and arranged at equal intervals on the circumference. Each of the antennas 4E is configured to be supported by a radially arranged support arm 4F, and a switching section extraction circuit (not shown) for each antenna output is provided in a backbone section 4G arranged at the center of these sections. To protect the upper protective cover-4
A. A lower protection cover 4B and its supporting column 4C are provided, and the lower flange portion 4D of this supporting column 4C is arranged on the upper flange 1C2 of the upper column 1C and fixed by screws.

The cone type dipole antenna 4E
The main portion 4G is a thin metal plate, for example, a thin aluminum plate, and the support arm 4F, the upper protective cover 4A, the lower protective cover 4B, and the support 4C are high-frequency insulating materials, for example,
It is made of glass fiber-containing polyester-based synthetic resin material, and each assembly part between the upper protective cover-4A and the lower protective cover-4B and between the grounding strut 2A and the upper protective cover-4A described later is packed or adhered. It is assembled with appropriate waterproofing (hereinafter referred to as waterproofing assembly).

The midrange frequency band direction finding antenna 5 is mainly composed of an antenna group of a cone type dipole antenna 5A in which the shape and arrangement of the high range frequency band direction finding antenna 4 are enlarged. , Each antenna 5A is supported by radially arranged support arms 5B, and a switching section extraction circuit (not shown) for each antenna output is provided in a trunk section 5C arranged in the center thereof. The side portion is arranged on the upper flange 1B2 of the column 1B and fixed by screws. The cone type dipole antenna 5A and the support arm 5B are made of the same material as that of the high frequency band direction detecting antenna 4, and the main portion 5C is made of metal.
For example, it is formed of a thick plate of aluminum or a cast material, and further, although not shown, the main portion 5C has an open lid on the upper side, and each portion of this antenna is an exposed type,
Each assembly part is waterproof. The studs 1E are arranged so as to pass through between the base portions of the support arms 5B.

The low frequency band direction finding antenna 6 is mainly composed of an antenna group in which a linear or thin cylinder type dipole antenna 6A is arranged in the vertical direction at equal intervals on the circumference. 6A is supported by a supporting arm 6B arranged radially, and a backbone portion 6 arranged in the center thereof.
A switching output circuit (not shown) for each antenna output is provided in C, and the lower portion of the backbone portion 6C is projected onto the flange 1D, and the support column 1B is attached to the support arm 6B.
The waterproof protection cylinder 6D is arranged below the main portion 6C and fixed by screws. The dipole antenna 6A is a metal thin straight tube,
For example, a thin tube material made of aluminum, and the supporting arm 6B and the trunk portion 6C are the antenna 5 for detecting the direction of the middle frequency band.
It is formed of the same material as that part, and further, the core part 6C is
Similar to the relevant part of the mid-frequency band direction finding antenna 5, the upper side is an open lid, each part of this antenna is an exposed type, and each assembled part is waterproof assembled.

Explaining each auxiliary antenna and lightning rod, the auxiliary antenna 3 for high / middle frequency band is a linear discon antenna and its upper antenna element 3A.
Is the ground side, the lower antenna element 3B is used as the reception output terminal side, and the lightning rod 2 is formed in the center of the upper side of the upper antenna element 3A mainly for the connection reverse to the general usage. . The upper antenna element 3A radiates a linear linear group radially in all directions in a circular disk shape, and supports each root portion of the root portion with a ring-shaped trunk portion 3C and uses the trunk portion 3C as a base of the lightning rod 2. The lower antenna element 3B is formed so as to be electrically connected in a fixed manner, and the lower antenna element 3B is formed by radially projecting linear filament groups in a diagonally downward direction into a conical side surface, and each root portion thereof is a ring-shaped trunk portion 3D.
Is supported and formed by the insulating ring 3
The lightning rod 2 is fixedly formed in an electrically insulated state with respect to the grounding column 2A of the lightning rod 2 via E, and is arranged and supported by the grounding column 2A.

The upper antenna element 3A and the lower antenna element 3B are thin metal wire strips, for example, thin rods of stainless steel or aluminum.
Is a metal such as an aluminum material, and the insulating ring 3E
Is formed of a high-frequency insulating material, for example, an ethylene-based synthetic resin material. Further, each part of the antenna is exposed and each assembly part is waterproof-assembled. The waterproofing of this part may be waterproofing with silicone rubber.

The auxiliary antenna 7 for the middle and low frequency bands is mainly composed of a linear fan-shaped dipole antenna in the vertical direction, and the upper antenna element 7A is a support 1A.
A group of straight lines extending radially in the upper fan-shaped range of a plane parallel to the plane, and a lower antenna element 7B projects a group of straight lines in the lower fan-shaped range of the plane, and the root portions of these antenna elements are set to the base portion 7C. It is formed by being supported by a support band 7D, and is arranged in the middle part of the column 1A by a support band 7D and fixed by screws. The support band 7D is a metal, for example, an iron material, the upper antenna element 7A and the lower antenna element 7B are a linear thin-walled metal tube, for example, a thin-walled aluminum tubular material, and the trunk portion 7C is a high-frequency insulating material. For example, it is formed of an ethylene-based synthetic resin material, and the main portion 7C is an open lid on the side opposite to the pillar 1A, though not shown, and each antenna portion is exposed. And each assembly part is waterproof.

In the figure, each antenna 3, 4, 5, 6 ,.
The circuit wiring between each antenna element of FIG. 7 and each of its main parts and in the main part is omitted, and the lightning rod 2 and each antenna 3, 4
The grounding wiring of 5, 6, and 7 and the wiring of each output will be described. As for the grounding wiring of the lightning rod 2, the grounding pillar 2A is passed through the high frequency band direction detecting antenna 4 and the lower side of the lower protective cover 4B. To the side of the pillar 4C from where it is connected to a thick grounding conductor 10A, for example, a stranded wire of copper wire, and along the outside of the pillar 1C, 1B, 1A, the outside of the lower flange 1A1 of the pillar 1A. It is wired to lead to.

The wiring of the output cable 10B of the auxiliary antenna 3 for high / middle frequency band passes through the hollowed hole at the center of the grounding support 2A and is located in the center of the antenna 4 for detecting the direction of high frequency band. Then, it is bundled in parallel with the output cable 10C of the high frequency band direction detecting antenna 4 and passed through the pillar 1C from the lower side of the pillar 4C to the side opposite to the ground conductor 10A between the studs 1E. Derived from this, alongside the main part 5C / post 1B, and near the upper side of the post 1B, the output cable 10D of the antenna 5 for detecting the mid-frequency band direction described later.
Bundle them in parallel with and place them along the outer side of the pillar 1B,
Around the upper side of A, the post 1A is bundled in parallel with the output cable 10E of the low frequency band direction finding antenna 6 described later.
Along the outer side of the column, and bundle the output cable 10F of the auxiliary antenna 7 for middle and low frequency bands, which will be described later, in the vicinity of the middle side of the column 1A in parallel with the output cable 10F and lead it to the outer side of the lower flange 1A1. is there.

The output cable 10D of the antenna 5 for detecting the direction of the mid-frequency band passes through the pillar 1B from the lower side of the backbone 5C and is guided to the outside from the lateral hole of the pillar 1B near the upper side of the pillar 1B. Bundle with other output cables,
Output cable 10 of low frequency band direction finding antenna 6
E is led out from the lower side of the trunk portion 6C to the outer side of the column 1A so as to be bundled with other output cables as described above.

As described above, in the antenna device of this embodiment, the omnidirectional antenna by the discone antenna is arranged at the top of the pillar, and each direction detecting antenna is arranged at the middle of the pillar, and below the pillar. Is an antenna device having a fan-shaped omnidirectional antenna arranged in the middle part of the pillar, and the bottom flange 1A1 of the pillar is screwed to a concrete foundation on the ground or on the roof by an appropriate method. It is used by fixing, and the dimensions of the concrete example when the reception frequency band of each antenna is shown beside the number code of each antenna in the figure It is the size. It should be noted that the orientations of the front and side surfaces in the drawings are tentatively set, and the orientations may be changed as appropriate according to the situation of the installation location.

[0019]

[Modified Embodiments] The present invention can be modified and implemented as follows. (1) The size of each part is changed to be configured to be suitable for an appropriate reception frequency band. (2) The auxiliary antenna 3 for high / medium frequency band and the lightning rod 2, that is, only the portion of the lightning rod-equipped disc antenna is configured as an independent communication antenna for high-altitude equipment.

(3) The auxiliary antenna 7 for the middle and low frequency bands is removed, and the high frequency band direction detecting antenna 4, the middle frequency band direction detecting antenna 5 and the low frequency band direction detecting antenna 6 are removed. One or more appropriate components are used. (4) When the wind pressure resistance is acceptable, the auxiliary antenna 3 for the high / medium frequency band, that is, the discon antenna forming the top antenna is not a linear type, but the upper antenna element is a disk and the lower antenna is a bottom antenna. The side antenna element is formed of a plate-shaped one formed of a conical tubular plate, and the auxiliary antenna 7 for the medium and low frequency band, that is, the fan-shaped dipole antenna is also formed of a fan-shaped plate-shaped one. To do.

(5) As shown in FIG.
Straighten up to the pillar 1C and connect directly to the pillar 1C, and connect the ground conductor 10A to the lower end of the pillar 1C, or
Further, the pillar 1A is also made of an aluminum or aluminum-clad steel tower, and the grounding conductor 10A is connected to the lower end of the pillar 1A. (6) In the case of equipment for ships, etc., an existing tower-shaped portion such as a mast is used instead of the pillar 1. (7) If the direction finding error is acceptable, the stud 1E
Part or all of the columns 1C and 4C are made of metal, for example,
It is made of aluminum.

[0022]

According to the present invention, as described above, the discone antenna mounted on the top has the upper antenna element as the ground side, and is provided with the grounding conductor and the lightning rod.
Since the antenna element itself is part of the lightning rod,
When installed and used in high places, there is no need to install a special lightning rod tower, and a wireless direction finding antenna device with good lightning protection effect and directional characteristics of the antenna that is not easily disturbed is constructed by constructing inexpensive and small equipment. There is a feature that can be.

[Brief description of drawings]

[Figure 1] Front view

[Figure 2] Side view

FIG. 3 is a longitudinal sectional view

4 is a plan view

[Fig. 5] Cross-sectional view of main parts

FIG. 6 is a cross-sectional view of the main part

FIG. 7 is a cross-sectional view of the main part

FIG. 8 is a vertical cross-sectional view of main parts

FIG. 9 is a vertical cross-sectional view of main parts

FIG. 10 is a vertical cross-sectional view of main parts

FIG. 11 is a vertical cross-sectional view of the main part

[Explanation of symbols]

 1 Prop 2 Lightning rod 3 Auxiliary antenna for high / middle frequency band 4 Antenna for directional detection of high frequency band 5 Antenna for directional detection of mid frequency band 6 Antenna for directional detection of low frequency band 7 Auxiliary antenna for medium / low frequency band

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H01Q 9/28 H01Q 9/28

Claims (1)

(57) [Scope of utility model registration request] 1. A radio direction finding antenna device in which a direction finding antenna is arranged in a middle portion of a column which is installed and used at a high place such as on the ground or on a rooftop or on a mast of a ship, comprising: a. An antenna connecting means for disposing a discone antenna on the top of the antenna device, connecting the lower antenna element (cone) to the output side and the upper antenna element (disk) to the ground side; b. For the detection of a radio direction, which is provided with a grounding means for forming and connecting a lightning rod in the upper center part of the upper antenna element (disk) of the discone antenna Antenna device.