JPH066568Y2 - Folding antenna for direction finding - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direction-finding foldable antenna suitable as an antenna for a land-based radio direction finder or the like.

[0002]

2. Description of the Related Art As an antenna for a direction finder, there is a circumferential array antenna having a structure in which tablet type antennas as shown in FIG. 12 are equidistantly arranged on the circumference. This antenna has a central conductor 2 for an omnidirectional antenna, which is erected on the upper part of the central seat 1 so as to be aligned with the longitudinal axis of the central seat 1 (hereinafter referred to as the axial center), and radially around the outer circumference of the central seat 1. a plurality of support arms 3W ₁ ~3W ₈ mounted, the respective support arms 3W ₁ ~3W ₈
Spaced conductors 4A ₁ , 4A ₂ , 4B for directional antennas supported at the respective ends of the antenna in a direction parallel to the axis of the central seat 1.
₁ , 4B ₂ , 4C ₁ , 4C ₂ ... 4H ₁ , 4H ₂ .

Spaced conductors for directional antennas are one to the other.
Conductors facing each other by 80 °, such as 4A ₁ , 4A ₂ and 4E ₁ ,
If 4E ₂ is selected and connected to the power feeding circuit for reception, it becomes an adcock type direction finding antenna and obtains an 8-shaped directional characteristic. Further, if the configuration is such that it is connected to the power feeding circuit for reception while sequentially switching in a circular form, it becomes a Doppler type direction finding antenna and obtains a sinusoidal phase or frequency shift characteristic. These connections are made inside the center seat 1 or by a connection circuit provided at the base of each spaced conductor (the tip of each support arm).

[0004]

[Problems to be Solved by the Invention] The conventional circumferentially arrayed antenna shown in FIG. 12 has conductors 4A ₁ , 4A ₂ ... 4 arranged at intervals.
H ₁ and 4H ₂ are respectively supported on the tip ends of the support arms 3W _{1 to} 3W ₈ , and the center conductor 2 is also insulated and fixed to the upper end of the center seat 1 by screwing or the like. Such an antenna device can be used as a fixing device, but when the installation place is frequently moved, even if the reception frequency is 25 to 150 MHz, each support arm 3W ₁ to.
3W ₈ has a size of about 60 cm, that is, the spaced conductor 4
The diameter of the circle where A ₁ ... 4H ₂ is arranged is about 1.2 m, which is quite large and is inconvenient to carry.

Assuming that the central conductor 2 and the spaced conductors 4A ₁ ...
… Even if the 4H ₂ screwed-in part is removed and transported, it takes time to reassemble it at the installation site, and there is a problem that it cannot make time for measurements in an emergency.

[0006]

According to the present invention, a center conductor serving as an omnidirectional antenna conductor is mounted in a vertical posture on the upper surface of a center seat whose planar shape is polygonal, and the center conductor is attached to each polygon surface of the center seat. A support arm composed of an insulating pipe is supported in a radial direction, and the direction detection is formed by supporting a pair of directional antenna spaced conductors while holding a vertical posture at each tip of the support arm. In the folding antenna for use, a first hinge is interposed between each polygonal surface of the central seat and one end of the support arm so that the free end of the support arm can be turned upward, and a conductor arranged with a space between the support arm. A second hinge interposed between the tip of the support arm and each end of the spacing conductor so as to be folded in a parallel posture, and a second hinge provided on the rotation fulcrum side of the spacing conductor. Placed conductor is up and down at the tip of the support arm When it is in an overhanging position, it has a protrusion protruding from the tip surface of the support arm in a direction parallel to the axis of the support arm, and a piece formed of a flexible plate and protruding from the tip surface of the support arm. A lock plate that has a hole that engages with the protrusion on one side and that keeps the spacing conductor in an upright position by engaging the protrusion with this hole, and horizontally extends to the upper end side of the center conductor. The supported support plate, the number of recesses formed on the periphery of the support plate equal in number to the support arms, and the lock plate provided corresponding to the recesses and attached to the tip end surface of the support arm. The structure is provided with a protrusion that engages with the formed hole and holds the folding position of the support arm.

[0007]

According to the structure of the present invention, the mounting bases of the respective spaced conductors are folded inward by the second hinge in parallel with the support arm, and then the support arm is centered by the first hinge by utilizing the slack of the internal feeder. It can be folded upwards parallel to the conductor.

[0008]

【Example】

FIG. 1 shows the external structure of a direction-finding folding antenna according to the present invention. In the figure, the broken line shows the folded state. FIG. 2 is a plan view showing a state in which the support arms and the conductors arranged at intervals are expanded. The central seat 1 has a head 1A made of an insulating material as shown in FIG.
It is composed of a tubular portion 1B made of metal.

[0009] implanted in the head 1A of the center seat 1 to the center conductor 2 (hereinafter, simply referred to as a hinge) first hinge to the outer circumferential surface of the cylindrical portion 1B 5 radially supporting arm 3W ₁ ~3W ₈ via Install. As shown in FIG. 2, the cylindrical portion 1B has support arms 3W ₁ to 3W.
It has a polygonal shape with mounting surfaces C of the number W ₈ . Hinge 5 is provided on the upper side of the mounting surface, refracted freely supporting the support arm 3W ₁ ~3W ₈ upwardly through the hinge 5.

Planting structure of the central conductor 2 and supporting arms 3W ₁ ...
Figure 3 shows the details of the 3W ₈ mounting structure. As shown in FIG. 3, the head portion 1A of the central seat 1 is made of a short columnar insulating material a, and a central terminal body 6 made of a conductive material penetrates and is embedded in the axial center thereof. The central terminal body 6 has a female screw hole 6A on the upper end side, and the lower end of the central conductor 2 is screwed into the female screw hole 6A, so that the central conductor 2 extends along the axial center 1C of the tubular portion 1B. It will be planted on an upward extension line.

The lower end of the center terminal body 6 has a cylindrical portion 1 of the center seat 1.
It is introduced into the chamber b formed by B, and the connector 7
It is taken in through the circuit box 8 which houses the connection circuit for switching. Circuit box 8 is printed wiring board 9
It is fixedly supported inside the central seat 1 via. A hinge 5 is provided on each upper side of each mounting surface c of the tubular portion 1B. The supporting arms 3W _{1 to} 3W ₈ are supported by the hinge 5. Since the hinge 5 is provided on the upper side, the antenna support arms 3W _{1 to} 3W
₈ are each allowed to be bent in an upward direction only, and from the state of the horizontal radial direction orthogonal to the axial center of the tubular portion 1B,
1 can be folded up in the axial direction of FIG.

A hole 11 is formed in each mounting surface c of the cylindrical portion 1B, and a bowl-shaped lid 12 is fitted in the hole 11 in a concave shape. The lid 12 is made of a flexible material such as neoprene rubber, and is fitted to the peripheral edge of the hole 11 provided near the center of the mounting surface c. By fitting the lid 12, the peripheral edge on the opening side of the lid 12 is projected as an annular protrusion on the peripheral edge of the hole 11 to form a packing. The flange surface 13 of the hinge bracket 22 which is fitted fixed to the base end side of the support to the protruding portion 12A of the lid 12 arm 3W ₁ ~3W ₈ is pressed against the support arm 3W ₁ ~3W
_{Although the} hole 11 is waterproof when ₈ is expanded horizontally, the periphery of the hole 11 is in contact with the flange surface 13 to electrically shield the flange surface 13. Lock handle 14 is a lock of the handle for securing the flange surface 13 on state is pressed against to the peripheral edge support arm 3W ₁ ~3W ₈ was horizontally projecting protrusions 12A and the hole 11 of the lid 12, the lock handle As shown in FIG. 4, 14 is a "lever" having a hook portion 14A on the tip end side and a handle on the other end side with a fulcrum pin 14C fixed on the outer side of the lower side of the flange surface 13 as a fulcrum. The hook portion 14A is engaged with the engaging pin 15 provided on the lower portion of the mounting surface c to perform a forced tightening stop for waterproofing and electrical shielding. A roller 15A is fitted to the engagement pin 15 in order to facilitate the operation of the forced tightening stop. Further, as will be described later, the feeder 16 for guiding the reception output of the spaced conductors 4A ₁ ... 4H ₂ guided into the supporting arms 3W _{1 to} 3W ₈ is a spiral curl 16A made of plastic having good sliding property. Protected by the central hole 12 of the lid 12
It leads to a connector 9A provided on the printed wiring board 9 through C.

A pole coupling portion 17 is provided at the lower end of the center seat 1. This pole coupling portion 17 is a metal cylindrical body 17C.
And a flange 17A at the upper end, and this flange 17A is coupled to the cylindrical portion 1B of the central seat 1. The lower end of the cylindrical body 17C has a tightening portion provided with a slit S, and the outer periphery of this portion is inserted into the pole coupling portion 17 from below by a tightening handle 17B and a screw 17C with this tightening handle. The outer peripheral surface of the pipe-shaped pole 18 is tightened to fix the central seat 1 to the upper end of the pole 18. A cable 100A between the detection device body (not shown) and the antenna is a connector 1 also provided as a waterproof ground provided on the side of the cylindrical body 17C.
It is led out of the pole coupling part 17 via 7E.

Next, the internal structure of the support arms 3W _{1 to} 3W _{8 and} the support structure of the spaced conductors 4A ₁ , 4A ₂ ... 4H ₁ and 4H ₂ will be described with reference to FIGS. 5 to 8. Support arm 3
W _{1 to} 3W ₈ are insulating pipes in which the outer pipe body 21 is formed of, for example, reinforced plastic (FRP),
A hinge 5 and a hinge fitting 22 having a flange surface 13 are fitted to one end of the outer pipe 21. The hinge fitting 22 is a tubular body with one end closed, and forms the outer peripheral flange surface 13, the hinge 5 above the flange surface, and the boss 23 for the fulcrum pin 14C of the lock handle 14 below. I am doing it.

A feeder support fitting 24 made of a good conductor such as aluminum is fitted inside the closed surface g of the hinge fitting 22, and the feeder support fitting 24 allows the outer pipe 2 to be attached.
1 is a feeder pipe 26 which is installed in the center while supporting an earth pipe 25 which is vertically installed in the 1 and is screwed and supported.
Was through the support, the respective antenna support the center hole h of the feeder 16 closing surface g through the feeder tube 26 the arm 3W ₁ ~
It has led to the outside of 3W _8. Both the feeder pipe 26 and the earth pipe 25 are made of a good conductor such as an aluminum pipe.

The spiral curl 16A for protecting the fed-out feeder 16 is fixed to the feeder tube 26 protruding from the closed surface g by a crushing ring j. Further, the outer pipe 21 fitted with the ring packing k is fitted on the inner edge of the open end of the tubular portion n of the hinge fitting 22, and then the open end and the outer pipe 21 are adhered and fixed by the putty-like self-curing adhesive m. As shown in FIG. 6, a reinforcing cylinder 27 formed of an insulating resin material is fitted to the tip end side of the outer pipe 21, and the fixed element terminals 28A and 28B are supported via the reinforcing cylinder 27. The fixed element terminals 28A and 28B are positioned on the upper surface side and the lower surface side in the vertical direction (axial direction of the central seat 1) orthogonal to the insulating pipe 21 and are provided by waterproof adhesion and screw fixing.

The fixed element terminals 28A and 28B have a hinge portion r protruding from the outer peripheral surface of the reinforcing cylinder 27, and the movable element terminals 29A and 29B are connected to the hinge portion r by a pin t. Due to this hinge connection, the movable element terminals 29A and 29B support the space-arranged conductors (for example, 4A ₁ and 4A ₂ ) screwed and fixed to the movable element terminals 29A and 29B so that they can be folded down in the direction parallel to the axis of the outer pipe 21.

An upper and lower pair of the spaced conductors 4A _{1 to} 4H ₂ , for example, 4A ₁ and 4A ₂ are located outside the second hinges (hereinafter simply referred to as hinge portions) r of the movable element terminals 29A and 29B. By installing it at a right angle to
It is planted in an L-shape with respect to the hinge portion r and is supported in a direction perpendicular to the axis of the outer pipe 21 in a direction perpendicular to the axis.
As a result, the spacing conductors 4A ₁ and 4A ₂ are expanded from the state in which they are expanded in the direction perpendicular to the axis of the outer pipe 21 as shown by the solid line in FIG.
It can be folded in a state parallel to the axis of the outer pipe 21.

The movable element terminals 29A and 29B are provided with protrusions 31 on their outer ends, and the open end side of the reinforcing cylinder 27 is screwed to the outside of a cover plate 33 made of an insulating resin material which is screwed and closed via a packing u. The protrusion 31 is formed in the hole 32A formed in the lock piece 32 made of a flexible insulating resin material that is fixed and fixed.
Are engaged with each other so that the space-arranged conductors 4A ₁ and 4A ₂ can be retained and held in a state of being expanded in the vertical direction. This side surface state is shown in FIG.

A set screw 29B provided at the inner end of each fixed element terminal 29A, 29B slightly protruding inside the outer pipe 21 is used to set a flat portion of the tip of the earth pipe 25 and the conductors 4A ₁ , 4A arranged at intervals. _{The second} output take-out lug plates x ₁ and x ₂ are electrically connected and fixed. On the tip side of the feeder tube 26, a bag tube portion 26 made of the same material as the thick tube and having a thick tube shape.
A is provided, in which a printed wiring board y for electric circuit such as a balun (transformer for takeout) is housed, and lug boards x ₁ , x
_The input line of ₂ and the output line of the feeder 16 of the coaxial cable are wired.

A flange 26B made of an insulating resin material fixed with a fitting screw is provided on the outer side of the tubular bag portion 26A, and a support hole for the earth pipe 25 is provided above and below the flange 26B to provide an earth connection.
The pipe 25 is insulated and supported with respect to the feeder pipe 26, and a support piece 25B made of an insulating resin material is provided at a proper position in the outer pipe 21 to similarly insulate and support. Further, the upper and lower ground pipes 25 and the central feeder pipe 26 are connected to the conduction piece 25A at a proper position near the central seat 1 as shown in FIG.
A conductive line is fixed by a short circuit, and a trap line is formed to reduce the electrical impedance between the upper and lower spaced conductors 4A ₁ and 4A ₂ at the time of a lightning strike.

For this reason, the position of the conductive piece 25A is electrically adjusted and fixed to the best position. As shown in FIG. 10, the conduction piece 25A and the support piece 25B are divided into two parts, and the feeder tube 26 and the earth pipe 25 are sandwiched and fixed by tightening the screw p, and the outer diameter thereof is set to the inner diameter of the outer pipe 21. It can be fitted together. Then the structure portion holding the folded in the direction along the antenna support arm 3W ₁ ~3W ₈ to the center conductor 2 will be described with reference to FIGS.

Each of the support arms 3W _{1 to} 3W ₈ can be folded upward when the hook portion 14A of the lock handle 14 is disengaged from the engagement of the pin 15. Folded support arm 3 on the central conductor 2
W ₁ ~3W support ₈ is provided a support plate 34. The support plate 34 is fixed to the central conductor 2 via a boss 35 fitted to the central conductor 2. The support plate 34 has support arms 3W _{1 to} 3 on its outer circumference.
The recessed portions 36 that engage with the distal end portion of W ₈ are formed in the direction at equal intervals of the number of support arms, in this example 8 directions (see FIGS. 2 and 10), and the support arms 3W _{1 to} 3W ₈ are folded. in a state, to engage the outer peripheral surface of the distal end portion of each support arm 3W ₁ ~3W ₈ to the concave portion 36. The projection 37 is planted on the axial center 1C side of each recess 36. By engaging the ones on the projection 37 of the upper side of the locking plate 32 of the hole 32A attached to the tips of the support arms 3W ₁ ~3W _8, the support arms 3W ₁ ~3W ₈ in a folded state, respectively You can hold and lock it.

FIG. 11 shows an example of a pole that supports the above-mentioned folding antenna. The pole shown here has a structure in which the antenna is automatically expanded by compressed air and the antenna can be temporarily installed in a short time. In FIG. 11, 100 is a base end pipe, 200 is a telescopic pipe, and 300 is an upper end pipe. The base end pipe 100, the expansion pipe 200, and the upper end pipe 300 are made of aluminum to reduce their weight. The lower end of the base pipe 100 is closed to form an airtight structure, and an air inlet 101 is provided near the lower end.
To provide. Reference numeral 400 denotes a tripod attached to the base pipe 100. The tripod 400 supports the base pipe 100 in a vertical posture with respect to the ground.

The telescopic pipe 200 has an outer diameter slightly smaller than the inner diameter of the proximal pipe 100 and is inserted into the hollow portion of the proximal pipe 100. The upper end pipe 300 has an outer diameter slightly smaller than the inner diameter of the telescopic pipe 200 and is inserted into the hollow portion of the telescopic pipe 200. Lids 201 and 301 are provided on the upper ends of the expandable pipe 200 and the upper end pipe 300, respectively. The lid 301 provided on the upper end pipe 300 is completely sealed to prevent air from leaking. On the other hand, the lid 201 provided on the telescopic pipe 200 has a hole 20 at the axial center position.
2 through which compressed air is introduced into the hollow portion of the expandable pipe 200.

Valves 203 and 303 are provided on the lower sides of the lids 201 and 301, respectively, between the inner wall surface of the proximal pipe 100 and the outer wall surface of the telescopic pipe 200, and the telescopic pipe 200.
The inner wall surface and the outer wall surface of the upper end pipe 300 are airtightly maintained. By applying compressed air from the air inlet 101 by this airtight structure, the pressure in the hollow portion of the proximal end pipe 100 rises, and the rise in pressure pushes the expandable pipe 200 upward. At the same time, the compressed air enters the hollow part of the expandable pipe 200 through the hole 202 and increases the pressure in the hollow part of the expandable pipe 200. As a result, the upper end pipe 300 also extends upward.

Reference numeral 500 represents a limiting means constituted by, for example, a metal wire or a chain. The restricting means 500 limits the upward expansion amount of the expansion pipe 200 and the upper end pipe 300 to prevent the expansion pipe 200 and the upper end pipe 300 from coming out of the lower pipes. Reference numeral 600 represents a fastener. The fasteners 600 are provided at the upper ends of the proximal pipe 100 and the telescopic pipe 200, respectively, and the upper pipe 300 and the telescopic pipe 20 are extended when the telescopic pipe 200 and the upper pipe 300 extend up to the restricted position.
Fixed between 0, telescopic pipe 200 and proximal pipe 10
Fix between 0 and all pipes 100, 20
Fix 0,300 in the stretched state. If it is fixed by the fastener 600, the pole is maintained in the extended state even if the supply of compressed air is interrupted.

By using the pole that extends by compressed air as described above, the antenna can be easily temporarily installed above the sky. Tripod 400 to stand the pole
Since it suffices if there is a place to install the antenna, the antenna can be easily installed temporarily even in a small space.

[0029]

As described above, according to the direction-finding folding antenna according to the present invention, the supporting arm 3W in the folded state is used.
_{1 to} 3W ₈ and spaced conductors 4A ₁ , 4A ₂ ... 4
It is possible to fold and store all of H ₁ and 4H ₂ in a state parallel to the central conductor 2. Therefore, it becomes almost rod-shaped as a whole and is convenient to carry. Therefore, there is an advantage that the direction finding device can be freely moved and installed.

Further, the assembly is carried out by simply supporting arms 3W _{1 to} 3W ₈
Since the assembly is completed only by unfolding and expanding the space-arranged conductors 4A ₁ , 4A _2, ... 4H ₁ , 4H ₂ , the time required for assembly is short. Further, the total number of the spaced conductors 4A ₁ , 4A ₂ ... 4H ₁ , 4H ₂ is 8 × 2 in the embodiment, and the number is large in the prior art, and the antenna could be stood up without being attached. The folding antenna according to the present invention comprises the conductors 4A ₁ , 4A ₂ ... 4 arranged at intervals.
Since H ₁ and 4H ₂ are already attached to each support arm, there is no risk of rubbing.

Further, when the telescopic pole shown in FIG. 11 is used, it is possible to obtain the advantage that the temporary installation of the antenna can be performed more easily.

[Brief description of drawings]

FIG. 1 is an external side view of an antenna in a folded state and a deployed state.

FIG. 2 is a plan view of a developed state.

FIG. 3A is a side half sectional view of a central portion, and FIG. 3B is a lateral sectional view of a pole mounting portion.

FIG. 4 is a bottom view of the support arm on the base end side.

FIG. 5 is a side sectional view of the support arm on the base end side.

FIG. 6 is a side sectional view of the support arm on the distal end side.

FIG. 7 is a side view of the outer appearance of the support arm on the distal end side.

FIG. 8 is a front view of the front end side of the support arm.

FIG. 9 is a half cross-sectional view of a tip side surface of the support arm in a folded state.

FIG. 10 is a plan half sectional view of the support arm in a folded state.

FIG. 11 is a side sectional view of an example of an antenna support pole.

FIG. 12 is an external perspective view of a conventional antenna.

[Explanation of symbols]

1 Center Seat 2 Center Conductor 3W _{1 to} 3W ₈ Support Arms 4A ₁ , 4A ₂ ...... 4H ₁ , 4H ₂ Spacer Conductor 5 1st Hinge r 2nd Hinge 6 Center Terminal 7 Connector 8 Circuit Box 9 Printed Wiring Board 11 Hole 12 Lid 13 Flange surface 14 Lock handle 15 Pin 16 Feeder 17 Pole coupling part 18 Pole 21 Outer pipe 22 Hinge fitting 23 Boss 24 Feeder support fitting 25 Earth pipe 26 Feeder tube 27 Reinforcing cylinder 28A, 28B Fixed element terminal 29A, 29B Movable element terminal 31 Protrusion 32 Lock plate 33 Lid plate 34 Support plate 35 Boss 36 Recessed portion 37 Protrusion

Claims (2)

[Scope of utility model registration request] 1. A. A center conductor serving as an omnidirectional antenna conductor is mounted in a vertical posture on the upper surface of the center seat having a polygonal shape in plan view, and a support arm composed of an insulating pipe is radially supported on each polygon surface of the center seat. A direction-finding foldable antenna constructed by supporting a pair of directional antenna spaced-apart conductors while maintaining a vertical posture at each tip of the support arm. A first hinge 5 inserted between each polygonal surface of the central seat and one end of the support arm so that the free end of the support arm can be rotated upward; A second hinge r interposed between the tip of the support arm and one end of each of the spaced conductors so that the spaced conductor can be folded in a posture parallel to the support arm; When the spacing conductor is provided on the rotation fulcrum side of the spacing conductor, and the spacing conductor is in the posture of projecting in the vertical direction at the tip end portion of the support arm, the support arm moves in a direction parallel to the axis of the support arm. A protrusion 31 protruding from the tip surface, and E. It has a piece portion formed of a flexible plate and protruding from the tip end surface of the support arm, and has a hole 32A that engages with the projection 31 in this piece portion, and engages the projection 31 with the hole 32A. A lock plate 32 for maintaining the above-mentioned spaced conductors in a posture of projecting in the vertical direction; A support plate 34 which is horizontally extended and supported on the upper end side of the center conductor; The number of recesses 36 formed on the periphery of the support plate 34 and equal to the number of the support arms, A protrusion 37 which is provided corresponding to the recessed portion 36 and which is engaged with a hole 32A formed in the lock plate 32 attached to the tip end surface of the support arm to hold the folding position of the support arm.
A folding antenna for direction finding, characterized by being provided with. 2. The folding antenna for direction finding according to claim 1, wherein the center seat is composed of a cylindrical portion made of metal, and a head made of an insulating material attached to the upper portion of the cylindrical portion. , A folding antenna for direction finding of a structure in which a central conductor is insulated and supported on the head.