JPH08125428A - Antenna system - Google Patents

Abstract

PURPOSE: To realize the antenna system in which a mount/dismount structure of a sheet shaped radome is simplified and which is handled and operated simply and easily at a low cost. CONSTITUTION: A ring shaped shield plate 3 is fitted to a front face of a ring shaped support frame 2 fitted to a circumferential ridge of an opening of a parabolic reflecting mirror 1 with a hinge metallic fixture 4 and locks 51 -53 . When the locks 51 -53 are unlocked, the shield plate 3 is turnable around a support shaft of the hinge metallic fixture 4. The shield plate 3 is fixed to the circumferential ridge of the support frame 2 by making a circumferential ridge of a rear part of the shield plate 3 in close contact with the circumferential ridge of the support frame 2 and locking the locks 51 -53 . A ring shaped groove 7 is made to an inner side of the circumferential ridge of the front part of the shield plate 3, a circumferential part of a radome 6 is inserted between a bottom wall and a side wall of an elastic linear metallic retainer 8 and the groove 7, and a wedge shaped metallic fixture 9 is inserted between a gap at both ends of the metallic retainer 8 and fixed by a tightening screw 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device suitable for, for example, millimeter wave communication, and more specifically, to a red-radiator for preventing adhesion of dust, raindrops or snowfall on a primary radiator and a reflecting mirror surface. The present invention relates to a mounting structure for a frame and a mounting structure for a sub-reflecting mirror.

[0002]

2. Description of the Related Art FIG. 3 (a) is a side view showing an example of a conventional antenna device having a partial cutout portion, and FIG. 3 (b) is an enlarged view of the cutout portion in FIG. 3 (a). Is a parabolic reflector, 2 is a ring-shaped support frame provided on the periphery of the opening of the parabolic reflector 1, 3 is a ring-shaped shield plate attached to the ring-shaped support frame 2, and 6 is a sheet-shaped lens. -A collar part whose peripheral part is provided on the front peripheral edge of the ring-shaped shield plate 3
3 sandwiched between the ₁ and the ring-shaped retainer member 18 by bolts 19 _n and the nut 20 _n provided suitable number at a suitable interval in the circumferential direction of the flange portion 3 ₁ and the ring-shaped retainer member 18, sheet - DOO shaped Toledo - mounting of arm 6 - DOO shaped Toledo - sheet by fixing the flange portion 3 ₁ of the field plate 3 - peripheral portion of the arm 6 and the ring-shaped retainer member 18 the ring-shaped sheet It is configured to do.

FIG. 4 (a) is also a side view having a partially cutaway portion showing an example of a conventional antenna device, and FIG. 4 (b) is
In the enlarged view of the cutout portion in FIG. 4 (a), 21 _n is an L-shaped support metal fitting which is attached to the ring-shaped support frame 2 at an appropriate interval in the circumferential direction, and 22 _n is a J-shaped bolt. , L-shaped support fitting 21 _n is slidably inserted into a through-hole (a through-hole having an inner diameter appropriately larger than the shaft diameter of the J-shaped bolt 22 _n ) formed between the bolt 23 _n and the L-shaped support fitting 21 _n . The J-shaped bolt 22 _n is always pulled to the left side in the drawing by the elastic force of the spring 24 _n interposed therebetween. twenty five
_n is a support rod inserted and supported in the curved portion of the J-shaped bolt 22 _n ,
26 _n is a support cord, one end of which is fixed to a plurality of places in the peripheral portion of the sheet-shaped red dome 6 at appropriate intervals in the circumferential direction, and is supported by a ring-shaped portion formed at the other end. Stick 25 _n is inserted. The support cord 26 _n is a sheet-shaped red dome 6.
Two pieces are attached to the fixed portions in the peripheral part of the, and the curved portion of the J-shaped bolt 22 _n is interposed between the two ring-shaped portions when inserting the support rod 25 _n into the ring-shaped portion formed at each other end. It is combined as follows.

FIG. 5 (a) is also a side view having a partially cutaway portion showing an example of a conventional antenna device, and FIG. 5 (b) is
Figure 5 an enlarged view of a notch in (a), in the antenna device, a ring-shaped sheet - shield plate 3 of the flange portion 3 ₂ a ring-like supporting frame 2 of the flange portion 2 ₁ projecting to the rear peripheral edge On bolt 27
fixed with _n and nuts 28 _n, ring-shaped sheet - sheet between the flange portion 3 ₁ and the ring-shaped retainer member 18 projecting from the front peripheral edge of the shield plate 3 - DOO shaped Toledo - near arm 6 The parts are sandwiched and fixed with bolts 19 _n and nuts 20 _n .

FIG. 6 (a) is also a side view having a partially cutaway portion showing an example of a conventional antenna device, and FIG. 6 (b) is
An enlarged view of a notch in FIG. 6 (a), the in the antenna device, a ring-shaped sheet - a flange portion which protrude to the rear peripheral edge of the shield plate 3 3 ₂ and the peripheral portion of the reflector 1, a butterfly screw 29 _n, space - Sa 30 _n, joined by the packing 31 _n and retainer member 32 _n, ring-shaped sheet - between the flange portion 3 ₁ and the ring-shaped retainer member 18 projecting from the front peripheral edge of the shield plate 3 The peripheral portion of the sheet-shaped red dome 6 is sandwiched between and fixed by bolts 19 _n and nuts 20 _n .

FIG. 7 (a) is also a side view having a partially cutaway portion showing an example of a conventional antenna device, and FIG. 7 (b) is
An enlarged view of a notch in FIG. 7 (a), in the antenna device, a ring-shaped sheet - a flange portion which protrude to the rear peripheral edge of the shield plate 3 3 ₂ and the peripheral portion of the reflector 1, a relatively Large J
A collar portion which is connected to the bolt 33 _n by a relatively large nut 34 _n and projects on the front peripheral edge of the ring-shaped shield plate 3.
Between 3 ₁ and the ring-shaped retainer member 18 - DOO shaped Toledo - sandwiching a peripheral portion of the arm 6, it is secured by bolts 19 _n and the nut 20 _n.

Incidentally, in FIG. 3 to FIG. 7, the bolt 19
_n , nut 20 _n , L-shaped support bracket 21 _n , J-shaped bolt 22
_n , nut 23 _n , spring 24 _n , support rod 25 _n , support cord
26 _n , bolt 27 _n , nut 28 _n , thumbscrew 29 _n , spacer
30 _n , packing 31 _n , press fitting 32 _n , relatively large J
The mold bolt 33 _n , the relatively large nut 35 _{n, and the} like include the reflecting mirror 1, the ring-shaped support frame 2, and the ring-shaped shield plate 3.
Etc., a plurality of them are provided around each of them, and each of these should be given a reference numeral with a numeral representing a number of 1 to a plurality of numbers as a subscript. That is, in the enlarged view of the partly cutaway portion, it is typically represented by a symbol with n as a subscript.

FIG. 8A is also a sectional view showing an example of a conventional antenna device, 1 is a parabolic reflector, 2 is a ring-shaped support frame, 3 is a ring-shaped shield plate, and 6 is a shield. -A red dome, 11 is a primary radiator, and 35 is a pedestal metal, and a screw is carved on the outer peripheral surface. Reference numeral 36 denotes a sub-reflecting mirror, and a screw is carved on the outer peripheral surface of the base of the sub-reflecting mirror 36 as shown in an enlarged sectional view in FIG. Reference numeral 37 denotes a support cylinder for the sub-reflecting mirror 36, which is made of a suitable solid dielectric material and has an enlarged sectional view as shown in FIG.
Screws are engraved on the inner peripheral surfaces of the upper end and the lower end of the support cylinder 37, and the screws engraved on the inner peripheral surface of the lower end of the support cylinder 37 are attached to the outer peripheral surface of the base washer 35, as shown in FIG. 8A. The sub-reflecting mirror 36 is screwed with the screw engraved on the inner peripheral surface of the upper end of the support tube 37 and the screw engraved on the outer peripheral surface of the base of the sub-reflecting mirror 36, so that the sub-reflecting mirror 36 is located at a desired position. It is attached to.

[0009]

In the conventional antenna device shown in FIGS. 3 to 7, a large number of bolts 19 _n and nuts are used to mount the sheet-shaped red dome 6.
20 _n (Fig. 3), multiple L-shaped support brackets 21 _n , J-shaped bolts
22 _n , nuts 23 _n , springs 24 _n , support rods 25 _n and support strings 26 _n (FIG. 4), many bolts 19 _n , 27 _n and nuts 20 _n , 28 _n (FIG. 5), many bolts 19 _n , Nut 20
_n , thumbscrew 29 _n , spacer 30 _n , packing 31 _n, and press fitting 32 _n (FIG. 6), many bolts 19 _n , nuts 20
_n , a relatively large J-shaped bolt 33 _n and a relatively large nut 34 _n (FIG. 7) are required, so that the structure is complicated. Since it takes a lot of time and labor to connect and disassemble the respective parts, it is inevitable that the cost becomes high. Further, in the conventional antenna device shown in FIG. 8, a support cylinder 37 made of a solid dielectric is used to mount the sub-reflecting mirror 36 at a required position. However, if the wall pressure of the support cylinder 37 is increased, Support tube 37
The attenuation of the reflected wave from the sub-reflecting mirror 36 becomes large due to the dielectric loss in the above, and the attenuation of the reflected wave is reduced if the wall pressure of the support tube 37 is reduced, but the support tube 37 is finished to the required size. When processing and screwing the inner peripheral surface of the upper end and the lower end, etc., the support cylinder is likely to be damaged,
It is extremely difficult to process and inevitably comes at a high cost.

[0010]

SUMMARY OF THE INVENTION The present invention is directed to a ring-shaped support frame attached to the periphery of the opening of a parabolic reflector, a ring-shaped shield plate provided on the front surface of the ring-shaped support frame, and a ring-shaped support plate. And a sheet-shaped red dome provided on the front surface of the shield plate, and around the rotation axis of the hinge fitting mounted between the ring-shaped support frame and the ring-shaped shield plate. The ring-shaped shield plate is rotatable, and a ring-shaped lock is installed between the ring-shaped support frame and the ring-shaped shield plate at an appropriate number at an appropriate interval in the circumferential direction. The shield plate is fixedly attached to the front surface of the ring-shaped support frame, and the peripheral portion of the sheet-shaped red dome is inserted in the groove provided inside the front portion of the ring-shaped shield plate. Insert it, and use the elastic linear retainer and the inner bottom and inner wall of the groove. Sheet - DOO shaped Toledo - by realizing configured antenna device to secure the periphery of the arm, it is intended to Nozoko the shortcomings of conventional antenna device.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1A is a side view showing an embodiment of the present invention (side view showing a partly cutaway portion), and FIG. 1B is a front view thereof (showing a partly cutaway portion). Front view), FIG. 1 (c)
Is an enlarged cutout view of the cutout portion shown in FIG.
(D) is an enlarged cutout view of the cutout portion shown in FIG. 1 (b), and 1 is a parabolic reflector, which is not shown in the figure,
The primary radiator is attached to the focal point of the reflecting surface of the reflecting mirror 1,
The radiated wave is reflected by the reflecting surface of the reflecting mirror 1 and is radiated from the opening surface of the reflecting mirror 1 as a substantially plane wave, or the radiating wave of the primary radiator is reflected by the sub-reflecting mirror, and the reflected wave is reflected by the reflecting mirror 1.
This is the same as in the prior art in that the light is reflected again by the reflecting surface and is emitted as a substantially plane wave from the opening surface. Reference numeral 2 is a ring-shaped support frame fixedly attached to the opening edge of the reflecting mirror 1, 3 is a ring-shaped shield plate, 4 is a hinge fitting, and the ring-shaped support frame 2 and the ring-shaped shield are shown. It is attached between the plates 3. 5 ₁ to 5 ₃ by opening and closing the lock, at a suitable interval in the circumferential direction, the ring-shaped support frame 2 and the ring-shaped sheet - is mounted between the shield plate 3. Although the figure shows an example in which three locks 5 ₁ to 5 ₃ are provided, the number may be increased or decreased as appropriate depending on the size of the antenna, such as 2 or 4, for example. 6 is a sheet-shaped red
, 7 is a ring-shaped groove provided inside the front part of the ring-shaped shield plate 3, 8 is a linear pressing metal fitting with high elasticity, 9 is a wedge-shaped metal fitting, and 10 is a tightening screw. .

When the locks of the locks 5 ₁ to 5 ₃ are broken and the ring-shaped shield plate 3 is rotated around the support shaft of the hinge fitting 4, the inside of the ring-shaped shield plate 3 is exposed. In that state, as shown in FIG. 1C, the peripheral portion of the sheet-shaped red dome 6 is provided inside the front portion of the ring-shaped shield plate 3. When the linear pressing metal fitting 8 having a high elasticity is inserted into the ring-shaped groove 7 and mounted in the groove 7, the peripheral portion of the sheet-shaped red dome 6 becomes a linear pressing metal fitting 8. It is sandwiched between the inner bottom and the inner wall of the ring-shaped groove 7, and as shown in FIG. 1D, a wedge-shaped metal fitting 9 is inserted between the opposing gaps of both ends of the linear pressing metal fitting 8. Then, when the tightening screw 10 is tightened, the wedge-shaped metal fitting 9 is deeply inserted into the facing gap of the both ends of the linear pressing metal fitting 8 to form the linear pressing metal. Ingredients 8 starve - DOO shaped Toledo - by pressing strongly periphery of arm 6, shea - DOO shaped Toledo - securely fixing the peripheral portion of the arm 6 in the ring-shaped groove 7. After the above work is completed, the ring-shaped shield plate 3 is rotated around the support shaft of the hinge metal fitting 4 so that the rear peripheral portion of the ring-shaped shield plate 3 is in front of the ring-shaped support frame 2. Close and lock the lock on the periphery 5 ₁
To by the lock 5 _3, shea - DOO shaped Toledo -
The installation of frame 6 is completed.

FIG. 2 (a) is also a sectional view showing an embodiment of the present invention, in which 1 is a parabolic reflector, 2 is a ring-shaped support frame fixedly attached to the peripheral edge of the opening of the reflector 1, 3 Is a ring-shaped shield plate, and 6 is a sheet-shaped red dome having the same construction as that shown in FIG. 11 primary radiator, 12 is the base metal, 13 subreflector, 14 ₁ to 14 ₃ in support legs, an enlarged side view of a main portion in FIG. 2 (b), of a main portion in FIG. 2 (c) As shown in the plan view, the upper ends of the support legs 14 ₁ to 14 ₃ are respectively provided on the projections 15 ₁ to 15 ₃ provided on the outer surface of the sub-reflecting mirror 13 at positions approximately equally divided in the circumferential direction. Attached rotatably around the attached support shaft, supporting legs 14 ₁ to
14 ₃ each lower end by cap nuts 16 ₁ to 16 ₃
Removably attach to the bolts 17 ₁ to 17 ₃ attached to the reflecting surface of the reflector 1, adjust the tightening degree of each cap nut 16 ₁ to 16 ₃ and adjust each length of the support legs 14 ₁ to 14 _3. Then, the sub-reflecting mirror 13 is moved to a desired position and attitude, that is, the electromagnetic wave emitted from the primary radiator 11, reflected by the sub-reflecting mirror 13 and re-reflected by the reflecting mirror 1 is almost a plane wave from the opening surface of the reflecting mirror 1. The sub-reflecting mirror 13 is configured so as to maintain a desired posture at a desired position so as to be emitted as.

[0014]

In the antenna device of the present invention, the structure for attaching and detaching the ring-shaped shield plate to and from the ring-shaped support frame and the sheet-shaped red dome on the front surface of the ring-shaped shield plate are provided. The attachment / detachment structure is simple, the handling operation is extremely easy and easy, and the cost can be reduced. Also, the sub-reflector is mounted using a support cylinder made of a solid dielectric that is extremely difficult to process as in the past. In addition, since the structure, the manufacture and the handling are simple and easy, and the three supporting legs are used, which has almost no adverse effect on the radiation characteristics of electromagnetic waves, it is possible to reduce the cost of stretching.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing an example of the present invention.

FIG. 3 is a diagram showing a conventional antenna device.

FIG. 4 is a diagram showing a conventional antenna device.

FIG. 5 is a diagram showing a conventional antenna device.

FIG. 6 is a diagram showing a conventional antenna device.

FIG. 7 is a diagram showing a conventional antenna device.

FIG. 8 is a diagram showing a conventional antenna device.

[Explanation of symbols]

1 Parabolic reflector 2 Ring-shaped support frame 2 ₁ Collar part 3 Ring-shaped shield plate 3 ₁ , 3 ₂ Collar part 4 Hinge metal fittings 5 _{1 to} 5 ₃ Open / close lock 6 Sheet-shaped red dome 7 Ring -Shaped groove 8 Wire holding metal fitting 9 Wedge-shaped metal fitting 10 Tightening screw 11 Primary radiator 12 Base washer 13 Sub-reflector 14 ₁ ~ 14 ₃ Support leg 15 ₁ ~ 15 ₃ Protrusion 16 ₁ ~ 16 ₃ Cap nut 17 ₁ ~ 17 ₃ Bolts 18 Ring-shaped holding fittings 19 _n Bolts 20 _n Nuts 21 _n L-shaped support fittings 22 _n J-shaped bolts 23 _n Nuts 24 _n Springs 25 _n Support rods 26 _n Support strings 27 _n Bolts 28 _n Nuts 29 _n Butterfly screws 30 _n Spacer 31 _n Packing 32 _n Holding bracket 33 _n J-shaped bolt 34 _n Nut 35 Base washer 36 Sub-reflector 37 Support tube

Claims (2)

[Claims] 1. A ring-shaped support frame attached to the periphery of an opening of a parabolic reflector, a ring-shaped shield plate provided on the front surface of the ring-shaped support frame, and a ring-shaped shield plate. A sheet-shaped red dome is provided on the front surface, and the ring-shaped support frame and the ring-shaped shield plate are provided around the rotation axis of the hinge metal fitting mounted between the ring-shaped shield plate. The shield plate is rotatable, and the ring-shaped support frame and the ring-shaped shield plate are closed by an appropriate number of locks attached at appropriate intervals in the circumferential direction. Of the sheet-shaped red plate is fixedly attached to the front surface of the ring-shaped support frame, and the sheet-shaped red dome is placed in a groove provided inside the front part of the ring-shaped shield plate. Inserting the peripheral part, the elastic linear pressing metal fitting and the groove An antenna device characterized in that a peripheral portion of the sheet-shaped redom is fixed by an inner bottom and an inner wall. 2. A primary radiator provided on the inner bottom of the parabolic reflector, and a sub-reflector provided on the front surface of the primary radiator so that its reflective surface faces the reflective surface of the parabolic reflector. An antenna device, wherein each of the lower end portions is configured to support the sub-reflecting mirror by the upper end portions of three supporting legs attached to the reflecting surface of the parabolic reflecting mirror.