JPH07109964B2 - Direction finding antenna device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is used for communication and direction finding assistance in combination with a direction finding antenna for detecting a plurality of frequency bands such as VHF, UHF and HF bands. The present invention relates to a direction finding antenna device having an omnidirectional antenna.

[Conventional technology]

This kind of omnidirectional antenna is generally a pseudo cone obtained by arranging a discone antenna or a dipole antenna on the top of the antenna support, or by synthesizing the reception output of each antenna element of the antenna for direction finding. A method of substituting such an omnidirectional output as the output of the omnidirectional antenna is adopted.

The direction finding assisting antenna is used as an omnidirectional antenna used for FM modulation cancellation and communication sound reception in, for example, a Doppler type direction finding device.

In a case where the frequency band for wireless direction detection is a very wide band, a plurality of direction detection antennas are provided so as to share an appropriate band, and the direction detection assisting antenna also functions as each direction detection antenna. A method is adopted in which they are combined into one pair and are mounted on different columns to be dispersedly arranged.

As an antenna device in which a plurality of antennas are arranged on such a support, each antenna is a Yagi antenna, the center of each antenna is aligned with the center of the support, and the antenna for high frequency is set upward and the vertical spacing of each antenna is about λ. / 2
The configuration of the antenna device arranged apart from each other (hereinafter referred to as the first conventional technology) is disclosed in Japanese Utility Model Publication No. 35-5107.

Further, in a direction-finding antenna device in which a plurality of direction-finding antennas are arranged on the same support, a supporting arm for supporting each antenna of the direction-finding antenna used in a high frequency band is used for a direction finder used in a low frequency band. JP-A-58-209204 discloses a configuration of a direction detecting antenna device (hereinafter referred to as a second prior art) in which two direction detecting antennas are arranged on the same center by passing them between the antennas. Has been done.

[Problems to be Solved by the Invention]

As described above, in a case where the plurality of direction finding antennas and the direction finding auxiliary antennas in which the frequency over a wide band is divided and shared by the plurality of frequency bands are arranged, the mutual interference between the antennas causes Since it causes the phenomenon of unreceivability or direction detection, it is necessary to disperse it to the extent that it can be avoided, a considerably large site is required, and there is the inconvenience that it can not be installed at all on a small site, on the ship, on the rooftop, etc. Therefore, it is expected that one antenna will be arranged in a column in a column to eliminate this inconvenience.

In such an arrangement, it is possible to use the above-mentioned first conventional technique and the second conventional technique. However, in the arrangement of the direction-finding antennas according to the above-mentioned second prior art, if the placement centers of the respective direction-finding antennas are not completely completely electrically matched, unbalanced capacitive coupling occurs between the antennas, resulting in a high frequency. Since a detection error is generated in the direction detection antenna used on the band side, there is a disadvantage that adjustment is required to remove the above imbalance.

On the other hand, in the configuration of arranging vertically as in the above-mentioned first conventional art, in the case of the direction-finding antenna, since a plurality of antennas are radially arranged, the vertical interval between the direction-finding antennas of each frequency band is The antennas can be arranged sufficiently apart from each other, but there is a disadvantage in that all the direction finding antennas cannot be arranged at the center of the column as in the first prior art.

Moreover, the auxiliary antenna for direction finding in the low frequency band naturally needs to be relatively long, and if this is arranged in parallel with the auxiliary antenna for direction finding in the high frequency band, both auxiliary antennas will not interfere with each other. However, there are inconveniences such as being impossible to put into practical use.

For this reason, there is a problem in that it is expected to provide a direction finding antenna device that solves the above inconveniences.

[Means for Solving the Problems]

The present invention is directed to a direction in which a plurality of direction finding antennas and direction finding auxiliary antennas for dividing a frequency in a wide band as described above into a plurality of frequency bands and performing wireless direction finding are arranged at the main points of a vertical support. In the detection antenna device, on the top side of the vertical column formed in a vertical straight line,
For the top side direction detection, the center of this vertical support and the above-mentioned direction detection antenna used for the highest frequency band of the above frequency bands, that is, the center of the high frequency direction detection antenna Antenna placement means and the above direction finding antenna used in the lowest frequency band of the above frequency band, that is, the above direction finding auxiliary antenna for the low range frequency band direction finding antenna, that is, the low range frequency band The direction-finding auxiliary antenna is composed of a fan-shaped dipole antenna, and the lower-side direction-finding auxiliary antenna arranging means arranged in the vertical direction parallel to the vertical stanchions at the lowermost side of the vertical stanchions. Directly above the low frequency band direction finding auxiliary antenna, center the above low frequency band direction finding antenna from the center of the vertical support. As well as placed in,
The lower direction detection antenna arranging means, which is arranged by inserting a part of the vertical support, between the portions of the supporting arms supporting the respective antennas of the above low frequency band direction detection antennas on the side close to the trunk part. In the antenna device for direction finding as described above, the vertical struts are formed by arranging a plurality of partial struts in a vertical straight line, that is, on the top side of the plurality of vertical struts. , The center of the plurality of vertical columns, and the above direction finding antenna used in the highest frequency band of the above frequency band,
That is, the apex side direction detecting antenna arranging means for arranging the center of the high frequency band direction detecting antenna so as to coincide with each other and the lower side of the plurality of vertical columns are used for the lowest frequency band of the above frequency bands. The direction-finding antenna, that is, the center of the low-frequency band direction-finding antenna is eccentrically arranged from the center of the plurality of vertical columns, and supports each antenna of the low-frequency band direction-finding antenna. An antenna locating means for downward direction detection, which is disposed through one of the above-mentioned partial struts between the portions of the supporting arm on the side close to the trunk, and the above-mentioned antenna used for an intermediate frequency band of the above-mentioned frequency bands. The direction-finding antenna, that is, the center of the mid-frequency band direction-finding antenna is arranged so as to coincide with the center of the plurality of vertical columns, and the high-frequency band direction-finding above Between each of the studs arranged at the joint of the above-mentioned partial columns located at an intermediate height between the position of the height of the antenna and the position of the height of the antenna for locating the low frequency band. ,
The above problem is solved by providing a second configuration including an intermediate position direction finding antenna arranging means arranged through each support arm that supports each antenna of the above-mentioned mid-range frequency band direction finding antenna. It is something that can be done.

〔Example〕

 Embodiments will be described below with reference to the drawings.

The figure shows a configuration in which a plurality of radio direction finding antennas assigned to each frequency band group and their auxiliary antennas are vertically arranged in a column on one column. In the figure, the column 1 is a lower column column 1A. It is composed mainly of a combination of partial struts consisting of the middle struts 1B and the upper struts 1C, and the antenna 5 for detecting the mid-range frequency band, which will be described later, is arranged between the upper struts 1C and the middle struts 1B. In order to connect the columns 1C and 1B above and below this, the flanges 1C1 and 1B2 of each column
In order to attach a plurality of studs 1E arranged in a cage between them, and a low frequency band directional antenna 6 to be described later, which is placed beside the middle pillar 1B and the lower pillar 1A, the pillars above and below this pillar. And an overhanging flange 1D arranged between the flanges 1B1 and 1A2.

The columns 1A and the overhanging flange 1D are mainly made of iron for strength, the columns 1B are mainly made of lightweight for aluminum, and the columns 1C and studs 1E are mainly for avoiding the influence of direction detection error. It is formed of a material, for example, a polyester-based synthetic resin material containing glass fiber, and is fixed by screws. That is, the studs 1E with a plurality of intervals are provided at the joint between the stanchions 1B and 1C that form a partial stanchion.
Is provided.

A high frequency band directional detection antenna 4 described later is arranged on the upper side of the upper column 1C, and a high / middle frequency band auxiliary antenna 3 described later is further arranged on the upper side of the upper column 1C. An auxiliary antenna 7 for the middle and low frequency bands, which will be described later, is arranged in the middle part.

Explaining each direction detecting antenna, the high frequency band direction detecting antenna 4 is mainly composed of an antenna group having a cone type dipole antenna 4E in the vertical direction and arranged at equal intervals on the circumference. 4E is supported by support arms 4F arranged radially, and a switching extraction circuit (not shown) for each antenna output is provided in a backbone part 4G arranged in the center thereof, in order to protect these parts, The upper protective cover 4A, the lower protective cover 4B, and the supporting column 4C are provided, and the lower flange portion 4D of the supporting column 4C is arranged on the upper flange 1C2 of the upper supporting column 1C and fixed by screws. That is, the high frequency band direction finding antenna 4
Are arranged so that the center of the column is aligned with the center of the column 1.

The cone-type dipole antenna 4E and the main portion 4G are thin metal plates, for example, thin aluminum plates, and the supporting arm 4F, the upper protective cover 4A, the lower protective cover 4B, and the supporting column 4C.
Is made of high-frequency insulating material, for example, glass fiber-containing polyester synthetic resin material, and each assembly part between the upper protective cover 4A and the lower protective cover 4B and between the grounding post 2A and the upper protective cover 4A described later is packed. Alternatively, it is assembled so as to be appropriately waterproofed by adhesion (hereinafter referred to as waterproof assembly).

The mid-range 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, and each of the antennas 5A is It is supported by support arms 5B arranged radially, and a switching section extraction circuit (not shown) for each antenna output is provided in a backbone section 5C located in the center of the backbone section. It is placed on the upper flange 1B2 and fixed with 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 backbone 5C is made of a metal, for example, a thick aluminum plate or a cast material, and Although not shown, the main portion 5C has an open lid on the upper side, each part of this antenna is an exposed type, and each assembling part is waterproof-assembled.

The studs 1E are arranged so as to pass through between the base portions of the support arms 5B. In other words, the medium frequency band direction finding antenna 5
While aligning the center of the with the center of the pillar 1,
The supporting arms 5B are arranged between the studs 1E arranged at the joint between the partial pillars 1B and the pillars 1C constituting the pillar 1.

The low-frequency band direction-finding antenna 6 is mainly composed of an antenna group in which a linear or thin-cylindrical dipole antenna 6A is arranged in a vertical direction and equally spaced on the circumference, and each antenna 6A is radially arranged. It is supported by the support arm 6B arranged, and a switching part extraction circuit (not shown) for each antenna output is provided on the backbone part 6C arranged at the center thereof,
As shown in the figure, the lower part of the main part 6C is projected onto the flange 1D, and by projecting the flange 1D, the center of the low frequency band direction finding antenna 6 is separated by a distance D4 from the center of the pillar 1 as shown in the figure. By making it eccentric, the pillar 1B, that is, the partial pillar of the pillar 1 is arranged between the base portions of the supporting arms 6B, that is, is arranged between the portions of the supporting arms 6B on the side closer to the trunk portion 6C. Further, a waterproof protection tube 6D is arranged below the main portion 6C and fixed by screws.

And the dipole antenna 6A is a metal thin straight tube,
For example, a thin tube of aluminum,
6B and the main portion 6C are formed of the same material as the relevant portion of the mid-frequency band direction detecting antenna 5, and the main portion 6C has the same upper portion as that of the relevant portion of the mid-frequency band direction detecting antenna 5. It is an open lid, each part of this antenna is exposed, and each assembly part is waterproof.

Explaining each auxiliary antenna and the part of the lightning rod, the auxiliary antenna 3 for high and middle frequency bands is a linear discone antenna with its upper antenna element 3A as the ground side.
The lower antenna element 3B is used as a 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.

In the upper antenna element 3A, a group of linear filaments is radially extended in all horizontal directions to form a disk surface, and each root portion is supported by a ring-shaped trunk portion 3C and the trunk portion 3C is protected by a lightning rod 2.
It is formed by electrically fixing it to the base portion in a conductive connection state, and the lower antenna element 3B radiates a linear filament group in a diagonally downward direction in a conical side surface shape, and each of its root portions has a ring shape. It is formed by being supported and formed by the trunk portion 3D, and the trunk portion 3D is electrically fixed and fixed to the ground strut 2A of the lightning rod 2 via the insulating ring 3E, and each is supported by the ground strut 2A. It is placed and fixed with screws.

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, and the trunk portions 3C and 3D are metal, for example, aluminum material, and an insulating ring. 3E is formed of a high-frequency insulating material, for example, an ethylene-based synthetic resin material. Further, each part of this antenna is exposed and each assembly part is waterproof assembled. The waterproofing of this part may be waterproofing with silicone rubber.

As shown in the figure, the auxiliary antenna 7 for the middle and low frequency bands is mainly composed of a linear fan-shaped dipole antenna in a vertical direction parallel to the supporting column 1, and the upper antenna element 7A is composed of the supporting column 1A. The straight line group is radially projected in the upper fan-shaped range of the parallel surface, the lower antenna element 7B projects the straight line group in the lower fan-shaped range of the surface, and each root portion of these antenna elements is the main portion 7C. It is formed by being supported, and is arranged in the middle part of the pillar 1A by a supporting 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 tube of metal, for example, a thin-walled tube of aluminum, and the backbone 7C is a high-frequency insulating material. , For example, it is made of ethylene-based synthetic resin material, and the main portion 7C is not shown,
The side opposite to 1A is an open lid, and each part of this antenna is exposed and each assembly part is waterproof.

In the drawing, the circuit wiring between each antenna element of each antenna 3, 4, 5, 6, 7 and between its respective main parts and in the main part is omitted, and the lightning rod 2 and each antenna 3, 4, 5, 6, 7,
Explaining the grounding and wiring of each output, the grounding wiring of the lightning rod 2 is such that the grounding strut 2A is passed through the antenna 4 for detecting the direction of the high frequency band, and the lower side of the lower protection cover 4B is located beside the strut 4C. Lead it out, connect it to a thick grounding conductor 10A, for example, a bundle of copper wires, and wire it along the outside of the pillar 1C, 1B, 1A and lead it to the outside of the lower flange 1A1 of the pillar 1A. There is.

Output cable 10B for auxiliary antenna 3 for high and mid frequency bands
The wiring goes through the hollowed hole at the center of the grounding support 2A and goes out to the center of the high frequency band directional antenna 4 in the same direction, where it is parallel to the output cable 10C of the high frequency band directional antenna 4. Bundle it up with the other side and pass it through the inside of the pillar 1C from the lower side of the pillar 4C and lead it out to the side opposite to the grounding conductor 10A between the studs 1E, and from here, alongside the trunk 5C and pillar 1B, near the upper side of the pillar 1B. The output cable 10E of the low frequency band direction finding antenna 6 described below is bundled in parallel with the output cable 10D of the mid range frequency band direction finding antenna 5 and placed along the outer side of the post 1B. Bundle them in parallel with each other along the outer side of the pillar 1A, and in the middle of the postscript near the middle of the pillar 1A.
It is wired so as to be bundled in parallel with the output cable 10F of the low frequency band auxiliary antenna 7 and led out to the outside of the lower flange 1A1.

Output cable 10D of antenna 5 for mid-range frequency band direction finding
Is the antenna for low frequency band direction detection antenna that passes through the inside of the pillar 1B from the lower side of the trunk 5C, guides it to the outside from the lateral hole of the pillar 1B near the upper side of the pillar 1B, and bundles it with other output cables as described above. The output cable 10E of No. 6 is led out from the lower side of the trunk 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 using the discone antenna is arranged at the top of the pillar, and each direction detecting antenna is arranged at the middle part of the pillar, and the middle of the pillar below the pillar. An antenna device in which a fan-shaped omnidirectional antenna is arranged in a part, and the lowermost flange 1A1 of the pillar is fixed to the concrete foundation on the ground or roof by an appropriate method such as screwing and used. The dimensions of a specific example in the case where the reception frequency band of each antenna is shown beside the number code of each antenna in the figure are dimensions shown in cm in the figure.

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.

Further, as described above, in the lower abdomen of the column, that is, in the abdomen of the column below the position where the direction finding antenna is arranged,
A fan-shaped antenna is arranged to form an omnidirectional auxiliary antenna.
The distance D1 between the parallel portion of the 7A and the support 1A, 1/4 or less of the wavelength of the highest frequency of the frequency band shared by this antenna, set and arranged as far as possible, also, this antenna element 7A Antenna element 6A for detecting the direction of the upper end
Since it is placed at a distance that does not interfere with the lower end of the antenna, it does not cause a disturbance error or a dead frequency band due to radio waves in the frequency band, and as the antenna element 7A becomes the tip. , Prop 1A
Since it is larger than the diameter of, the arrival direction of the radio wave is the side opposite to the side where the fan-shaped antenna is arranged, that is, the pillar 1A.
Since almost the same receiving sensitivity can be obtained even for a radio wave coming from the direction of the shadow of, the antenna can be operated as an omnidirectional antenna and the intended purpose can be achieved. Further, like the low-frequency band direction-finding antenna 6, between the supporting arms 6B, the pillar 1B is arranged close to the trunk portion 6C, and as shown in the drawing, the diameter of the pillar 1A D3 is the arrangement diameter of antenna element 6A, that is, span D2
1/10 or less, and the span D2 between the center of the backbone 6C, that is, the center of the antenna 6 and the center of the support 1B.
Since it is set to about 1/8 or less of the above, it is constructed by constructing a cheap and small facility for a pillar-mounted type direction finding antenna device that does not have a bad influence on the direction finding error. be able to.

To summarize the above configuration, a wide range of frequencies is divided into a plurality of frequency bands, and a plurality of direction-finding antennas and a direction-finding auxiliary antenna for performing radio direction-finding are arranged at the essential points of one vertical support. In the direction-finding antenna device, for the direction-finding used on the top side of the vertical pillar 1 formed in a vertical straight line, the center of the vertical pillar 1 and the highest frequency band of the frequency bands mentioned above. antenna,
That is, the top side direction finding antenna placement means for placing the center of the high frequency direction finding antenna 4 in alignment with each other, and the direction finding antenna used in the lowest frequency band of the above frequency bands, that is, , The above direction finding auxiliary antenna for the low range frequency band direction finding antenna 6,
That is, the low frequency band direction finding auxiliary antenna 7 is composed of a fan-shaped dipole antenna, and at the lowermost side of the vertical support column 1, a part of the vertical support column 1, that is, a vertical direction parallel to 1A. For example, as shown in FIG.
The center of the low frequency band direction detection antenna 6 is located directly above the lower direction direction detection auxiliary antenna placement means and the low frequency band direction direction detection auxiliary antenna 6 which are arranged apart from each other by a distance D1. For example, as shown in FIG. 6, the supporting arm 6B is arranged so as to be eccentric from the center of the vertical column by a distance D4 and supports each antenna 6A of the low frequency band direction detecting antenna 6 described above. The first configuration in which a part of the vertical column 1 described above, that is, the antenna arrangement means for downward direction detection arranged through 1B, is provided between the parts on the side closer to the trunk 6C, and the direction detection as described above. In the antenna device for use, a plurality of partial columns 1A, 1B, and 1C are formed by arranging them in a vertical straight line, that is, on the top side of the plurality of vertical columns 1A to 1C. Center of stanchions 1A-1C and the above frequency The above direction-finding antenna used for the highest frequency band of the bands, that is, the top side direction-finding antenna placement means for placing the center of the high-frequency band direction-finding antenna 4 in alignment with each other; On the lower side of the columns 1A to 1C, the direction-finding antenna used for the lowest frequency band of the above-mentioned frequency bands, that is, the center of the low-frequency band direction-finding antenna 6, for example, as shown in FIG. , The side of the support arm 6B that is eccentrically arranged from the center of the plurality of vertical columns 1A to 1C by a distance D4 and that supports each antenna of the low frequency band direction detecting antenna 6 that is closer to the trunk portion 6C. One of the vertical columns 1A to 1C described above, that is, the antenna arrangement means for downward direction detection arranged through 1B, and the above-mentioned direction detection antenna used in an intermediate frequency band of the above frequency bands. antenna, That is, the center of the mid-range frequency band direction finding antenna 5 is arranged so as to coincide with the center of the plurality of vertical columns 1A to 1C, and the height position of the high range frequency band direction finding antenna 4 and the above A plurality of studs 1E arranged at the joint of the above-mentioned partial columns located at an intermediate height from the height of the low frequency band direction finding antenna 6 of the above, that is, the joint of the columns 1B and 1C. And an intermediate position direction detecting antenna arranging means arranged through each supporting arm 5B that supports each antenna 5A of the above-mentioned mid-frequency band direction detecting antenna 5, and a second configuration. It is what is being done.

[Modified Example]

 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, that is, the portion of the discone antenna with a lightning rod is formed as a cone type dipole antenna or a radar antenna.

(3) One or a plurality of appropriate ones of the high frequency band directional detection antenna 4, the middle frequency band directional detection antenna 5, and the low frequency band directional detection antenna 6 are used.

(4) When the wind pressure resistance is acceptable, the auxiliary antenna 3 for the high / medium frequency band, that is, the discone antenna forming the top antenna is not a linear type, but the upper antenna element is a disk and the lower side is The antenna element is composed of a plate-shaped one formed of a conical tubular plate, and the auxiliary antenna 7 for the medium and low frequency bands, that is, the fan-shaped dipole antenna is also composed of a plate-shaped one formed of a fan-shaped plate.

(5) As shown in FIG. 12, make the grounding support 2A straight up to the support 1C and connect it directly to the support 1C, and connect the grounding conductor 10A to the support 1C.
Or the column 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 column 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, a part or all of the stud 1E, the pillar 1C, and the pillar 4C are made of metal, for example, aluminum material.

〔The invention's effect〕

According to the present invention, for the high frequency band direction detection for detecting a particularly high frequency by the top side direction detection antenna arrangement means and the second top side direction detection antenna arrangement means in the above-mentioned first configuration. Since the center of the antenna is aligned with the center of the column and it is placed on the top side of the column, it is possible to balance the capacitive coupling with other parts such as the column evenly as in the conventional case, so it is possible to detect the direction. The error can be reduced.

In addition, the intermediate frequency band direction detecting antenna for detecting a relatively high frequency by the intermediate position direction detecting antenna arranging means in the above-mentioned second structure is used, and the supporting arm of each antenna is connected to the joint of the partial columns. By adopting a new configuration in which it is passed between the studs that have been placed, it is possible to balance the capacitive coupling with other parts such as supports evenly even though it is placed in the middle part of the stanchion. The detection error can be reduced.

Further, in the low frequency band direction finding antenna that detects a low frequency by the lower direction detecting antenna arranging means in the first configuration and the lower direction detecting antenna arranging means in the second configuration, Even if the capacitive coupling with other parts such as stanchions is a little unbalanced, it does not significantly affect the direction detection error, so the center of the supporting arm that supports each antenna is eccentric from the center of the stanchion. By placing the pillars between the parts near the side, the strength of the pillars, which bear a large weight in the upper part, is not impaired, so it is possible to avoid strong winds such as typhoons or earthquakes such as earthquakes. It can be configured to be fully durable.

On the other hand, by the lower direction auxiliary detection antenna arranging means in the above-mentioned first configuration, the low frequency band direction detection auxiliary antenna with respect to the low frequency band direction detection antenna is provided vertically to the lowermost part of the support pillar in parallel with the support pillar. The low frequency band direction finding antenna is placed directly above the low frequency band direction finding antenna so that the low frequency band direction finding auxiliary antenna can be prevented from interfering with the high and mid frequency band direction finding antennas. Provided is a direction finding antenna device having features such that a long antenna can be obtained by avoiding interference with a frequency band auxiliary direction finding antenna, and the reception output required for the auxiliary antenna can be sufficiently received. be able to.

Further, when the high frequency band directional detection antenna 4, the middle frequency band directional detection antenna 5 and the low frequency band directional detection antenna 6 are all arranged at the center of the support column 1, For the maintenance work of the main part 6C of the frequency band direction finding antenna 6, a large-scale work of disassembling and removing the upper part from the location is required, and the studs are also used at the joint between the columns 1A and 1B. Since the same structure as 1E will be provided, the seismic strength of the base side of the pillar 1 will be weakened.

On the other hand, in the present invention, since only the low frequency band direction finding antenna 6 is arranged eccentrically from the center of the support, maintenance work of the backbone 6C can be performed without performing such disassembly work. Since the joint between the pillar 1A and the pillar 1B can be directly connected by, for example, a flange without interposing a stud, the joint can be strong in terms of earthquake resistance.

Since the wavelength of the high frequency band direction detecting antenna 4 and the medium frequency band direction detecting antenna 5 is short, the height and size thereof are relatively small.
When removing the upper part from the pillar 1C, a relatively light work is required.Because these parts are arranged relatively on the tip side of the pillar, in terms of seismic structure, the strength is as strong as the root side. Since it is not necessary, a simple structure may be sufficient.

Therefore, according to the present invention, there are features such as that it is possible to provide a direction-finding antenna device which is easy to perform maintenance work and is strong in earthquake resistance.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show embodiments, FIG. 1 is a front view, FIG. 2 is a side view, FIG. 3 is a longitudinal sectional view, FIG. 4 is a plan view, and FIGS.
The figure is a lateral cross-sectional view of an essential part, and FIGS. 8 to 11 are longitudinal sectional views of an essential part. 1 ... Prop 2 ... Lightning rod 3 ... Auxiliary antenna for high / middle frequency band 4 ... Antenna for direction detection in high frequency band 5 ... Antenna for direction detection in middle frequency band 6 ... Direction detection in low frequency band Antenna 7 ... Auxiliary antenna for middle and low frequency bands

Claims (2)

[Claims] 1. A direction in which a plurality of direction-finding antennas and a direction-finding auxiliary antenna for performing radio direction finding by dividing a frequency in a wide band into a plurality of frequency bands are arranged at the essential points of one vertical support. An antenna device for detection, wherein on the top side of the vertical support formed in a vertical straight line, the center of the vertical support, the direction detection antenna used in the highest frequency band of the frequency band (hereinafter, A top side direction finding antenna arranging means for arranging the center of a high frequency direction finding antenna) to coincide with the center, and the direction finding antenna used in the lowest frequency band of the frequency bands (hereinafter, low range). The direction finding auxiliary antenna for the frequency band direction finding antenna (hereinafter referred to as the low frequency band direction finding auxiliary antenna),
An auxiliary antenna locating means for downward direction detection, which is composed of a fan-shaped dipole antenna, and is arranged in the vertical direction parallel to a part of the vertical stanchion on the lowermost side of the vertical stanchion; At the position directly above the auxiliary antenna, the center of the low frequency band directional detection antenna is arranged eccentrically from the center of the vertical support, and a support arm for supporting each antenna of the low frequency band directional detection antenna is provided. A direction-finding antenna device comprising: a lower-side direction-finding antenna arranging unit, which is arranged between parts on the side close to the trunk part through the part of the vertical column. 2. A direction in which a plurality of direction-finding antennas and direction-finding auxiliary antennas for performing radio direction finding by dividing a frequency in a wide band into a plurality of frequency bands are arranged at the essential points of one vertical support. An antenna device for detection, wherein a plurality of partial struts are arranged in a vertical straight line to form the vertical struts (hereinafter referred to as plural vertical struts) on the top side, and the center of the plural vertical struts, A top side direction finding antenna arranging means for arranging the direction finding antenna used in the highest frequency band of the frequency bands (hereinafter, referred to as high frequency band direction finding antenna) so as to coincide with each other; On the lower side of the vertical support, the center of the direction detection antenna used for the lowest frequency band of the frequency bands (hereinafter, referred to as low frequency band direction detection antenna), the center of the plurality of vertical support For locating in a downward direction, the eccentric arrangement is performed and one of the vertical columns is provided between the portions of the supporting arms supporting the respective antennas of the low frequency band direction detecting antenna that are close to the trunk portion. The antenna placement means and the center of the direction finding antenna used for an intermediate frequency band of the frequency bands (hereinafter, referred to as mid-range frequency band direction finding antenna) are arranged so as to coincide with the centers of the plurality of vertical columns. Along with, the position of the height of the high frequency band direction detection antenna and the position of the height of the low frequency band direction detection antenna located at the middle of the height of the antenna to be placed in the joint of the partial columns. And an intermediate position direction finding antenna arranging means arranged through each supporting arm that supports each antenna of the intermediate frequency band direction finding antenna between each of the plurality of studs. Direction finding antenna apparatus characterized.