JPS6046602A - Parabolic antenna - Google Patents

Abstract

PURPOSE:To improve receiving efficiency and water-proof property by fitting a pair of dipole antennas to both the sidewalls of the case of a power supply part through a water-proof packing in a primary radiator constituting parabolic antenna. CONSTITUTION:The power supply case 15 is fixed on a carrying cylinder 8 by a brazing means in the primary radiator 14 constituting the parabolic antenna. The dipole elements 24 are fitted to the power supply case 15 through the packing 23. Since arriving microwaves are reflected by a reflector 1 and received by a pair of dipole elements 24, the receiving efficiency can be improved. The water-proof packing 23 can prevent water leakage into the power supply case 15.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a parabolic antenna for receiving microwave radio waves, and more particularly to the structure of a primary radiator in a parabolic antenna.

The purpose of this is that in the state of use,
To provide a parabolic antenna that can efficiently receive microwaves and has a structure that is durable against rain.

The drawings showing the embodiments of the present application will be described below.

Reference numeral 1 denotes a well-known reflecting mirror, the front surface of which is concave. 2
is a reinforcing frame along the back surface of the reflector 1, and its peripheral edge 2a
and the center portion 2b are both in contact with the back surface of the reflecting mirror 1. 3 is installed at the center (or an eccentric position is OK) of the reflecting mirror l (
A hollow primary radiator support made of metal material. Note that this is not limited to a conductive material, but may be formed of an insulating material. In this support body 3, numeral 4 denotes a substrate, which is placed against the front surface of the reflecting mirror l. Reference numeral 5 denotes a tightening plate, which is placed against the back of the reinforcing frame 2 and connected to the board 4 with an upper mounting bolt 6, so that the reflector 1 and the reinforcing frame 2 are connected between the board 4 and this tightening plate (Q plate 5). Numeral 07 indicates a supporting portion, which is formed into a cylindrical shape as shown in the figure. Numeral 08 is a holding tube made of a material having sufficient strength, such as a brass tube. It is fixed to the support part 7 by a multistage rear opening of the insert.The part consisting of the take-out cylinder 8 and the support part 7 is also referred to as the support cylinder 9 in this specification. Reference numeral 9 is for keeping the primary radiator at a constant distance and position from the reflecting mirror. Reference numeral 10 is a stop tube protruding from the substrate 4 to the back side of the reflecting mirror 1, and the tightening nut 11 is screwed into the stopper. In addition, there is a seal 1 between the stepped portion 10a provided on the locking tube 10 and the tip of the tightening nut 11.
2 (For example, an elastic body such as chloroprene rubber is used)
is mediated. This packing ν is expanded inward by tightening the tightening nut 11 and is crimped onto the outer peripheral surface of the cable bundle, which will be described later.

Next, a primary radiator 14 attached to the tip of the take-out tube 8
Q (dipole type with reflector) is a power supply case, which is hollow and made of a metal material with good conductivity, such as brass, for shielding purposes. (Note: Regarding the directions of "front" and "rear," in this specification, the front direction of the reflective shield, that is, the right side in Figures 3 and 3, is referred to as the front, and the opposite direction is referred to as the rear.) )
A through hole formed in the opening is placed over the tip of the carrying tube 8. Incidentally, in this covering part, the take-out tube 8 and the case b are fixed by brazing means.

17, 17 are a pair of opposing side walls L of the case, respectively.
5a and 1.5a are mounting holes, which are configured with screw holes. The 18Fi window hole is bored in another side wall between the pair of side walls 15a, 15a in the case. This window hole also has a screw hole. The main part is an insulating seat, which consists of a flange part M and a threaded part η, and the threaded part η is screwed into the mounting hole 17. This insulating pad is made of an insulating material that is resistant to heat and has low dielectric loss, such as fluororesin. The illusion is a patch, which is interposed between Tsuba Sae and the side wall 15a of the case. A material with sufficient elasticity, such as chloroprene rubber, is used as the seal. Even if the dielectric loss of the material used is large, this packing illusion does not have much of an effect because the size of the packing n is small. Sae is a dipole element and is made of a material with good conductivity, such as a brass rod. This element pair may be hollow or solid. In this element example, 241L is a main body, and 5 is a small-diameter penetrating portion, which is a through hole of the insulating seat.

It is press-fitted into 20a. Further, the tip of the penetrating portion serves as a connecting portion 25&, and the connecting portion 25a is exposed to the hollow case 15 side. The hood is a stepped portion formed around the portion of the main body 24a from which the penetrating portion 5 protrudes, and a gasket I is interposed between this stepped portion and the flange portion 21 in front of the insulating seat. As this packing η, the same one as in the above-mentioned packing is used. The cap is a waterproof cap that is tightly adhered to the outer periphery of the dipole element. Also case 15
The side end is brought into contact with the side wall 15a at the case location. This cap 3 includes the insulation seat and packing cap, 27
It was used to prevent deterioration due to ultraviolet rays. The cap Z is made of a material with low dielectric loss, such as acetal resin. Next, Shio shows a locking connection provided on the front wall 15b of the case b, which is integrally formed with the case b. In this fastening connection 9, numeral 9 indicates a spacer portion, which is a portion for maintaining the distance between the dipole element and the reflector plate. Reference numeral 31 denotes a penetrating portion, which is formed into an oval shape in the form of a ladder as shown in FIG. B indicates a step for positioning, and the wings indicate screw holes. Next is a reflective plate, which is made of a metal material with good conductivity, such as an aluminum plate.

This reflector barb is applied to the positioning step wing with the penetrating portion 31 passing through a through hole provided in the shape of the reflective plate (a through hole having a shape corresponding to the penetrating portion J). By tightening the screw hole in this state, it is fixed in the four-way position.

The fin is a well-known washer and is interposed between the reflector plate and the head of the screw head 5. Next, there is a lid, which is provided to cover the window hole of the power supply part case opening, and is made of a material with good conductivity (for example, iron or iron) for shielding. It is removably screwed into the window hole. The blade shows the well-known Patsukin.

Next, reference numeral 40 denotes an alignment member provided so as to extend from the inside of the tip of the take-out tube 8 to the inside of the power supply case. In this case, 41 is a tubular body made of a material with good conductivity, such as a brass tube.

In this tubular body 4, reference numeral C denotes a matching portion, and axially long strings (43, 43) are formed at two surrounding locations to form a split coaxial balun. 42a.

42a indicates two matching elements separated by 43.43. nb and ab are the tips of each element aa and 42a, and serve as dipole element connection parts. Note that a through hole 42C is formed here. The length of the slit is approximately equal to the wavelength of the received signal.

The mark indicates a step for positioning. The chrysanthemum indicates a retaining part, which is formed to have a small diameter as shown in the figure, and a retaining part with a slightly larger diameter is formed at the opposite end of the retaining part from the matching part C. It is. Reference numeral C denotes an insulating cylinder provided around the matching member, the inner diameter of which is approximately equal to the outer diameter of the matching part C, and the outer diameter of which is approximately equal to the inner diameter of the bringing-out cylinder 8. This is to prevent large wobbling from occurring between the cylinder C1 and the matching portion θ. Further, in this insulating cylinder 4, the north side is a retaining part, which engages with the step part 44 for positioning to achieve positioning with respect to the matching part C. The insulating tube 47 is made of a material with low dielectric loss, such as fluororesin, and its length is determined as follows. That is, the area of the matching member that shields the slit is designed to optimize impedance conversion of the split coaxial balun. Furthermore, this insulating tube C is formed to have the above-mentioned thickness so as to hold the tube body 4 at the center (axial center position) of the take-out tube 8. Next, dan is a well-known cable, ■ is the center conductor, ken is the inner insulator, yoshi is the outer conductor, and yoshi is the outer sheath. Note that a jθΩ type coaxial cable (for example, 5n, 2w) is used as the cable group. 5 indicates a crimping ring for fixing.

Next, the assembly of the above structure will be explained. First, the primary radiator 14 is assembled by passing the threaded part η of the insulating seat through the gasket, and then screwing it into the mounting hole 17 of the power supply part case part. After that,
After the base part of the dipole element row, that is, the penetration part 5 is inserted into the packing I, it is press-fitted into the through hole 20B of the insulation seat. Such operations are also performed for the other dipole element example. Furthermore, attach the reflector plate to the retainer 4 using the threaded rod 5 and washer 5. In this way, the assembly of the second radiator 14 is completed. may be performed prior to screwing the threaded portion η into the mounting hole 17). Further, the reflection plate array may be attached prior to attaching the dipole element example.

Next, the cable and the matching member 40 are connected.

For this connection, first, the tip of the cable ω is stripped in layers as shown in Fig. g. Next, cover the tube d with the insulation m47 (=I) in the matching member. Then, insert the tip of the stepped cable group into the inside of the tube d. In this case, the center conductor group is The external conductor group is exposed from the tip of the stopper and covers the outer periphery of the fastening part 6. After that, swage the caulking ring to fasten the outer conductor to the +j part 6 (q
At the same time, the center conductor is soldered to the tip of one element 42a in each alignment part. This completes the connection between the cable ω and the matching member ω as shown in FIG.

Next, the connection between the matching member and the primary radiator 14 will be explained. By sweeping as described above, the interconnected cables ω and matching member 1, as shown in FIG. 9, are removed from the 70th
As shown in the figure, the retaining tube 1 on the primary radiator support 3
0 and insert it into the take-out cylinder 8. And two elements 42a, 42a of the matching part C of the matching member.
enters into the power supply case 15 through the through hole 16 as shown in FIG. In this case, element 42a as shown in FIG.

The tips of 42a, that is, the connecting portions 42b, 42b are arranged along the connecting portions 25B, 25a of each dipole element example 24. In this way, the element 5 of the alignment member is connected to the connecting portion 25a.
The operation of aligning the tips 42b, 42b of B, 42& is as follows:
This can be easily done by looking through the window. After that, the connecting member S is inserted into the inside of the case through the window hole slide, and the connecting part 25a and the element 4 are connected.
2a (connecting portion 42b) are mutually connected. For example, solder is used as the connection member. This operation can be easily and accurately performed by inserting a soldering iron into the case 15 through the window hole and applying the soldering iron to the shielded portion between the connecting portion 25a and the connecting portion 42b. can. In the case of this soldering, since a through hole 420 is formed in the connection part 42b, the heat from the solder flows through the through hole 4.
You can concentrate on the circumference of 2e and easily perform soldering work. Once the above connections are completed, screw N38 into the window hole and seal the case. On the other hand, in the case of E attachment 110, the inner circumferential surface of the seal ν is pressed against the outer circumferential surface of the cable ω by screwing in the tightening nut n to prevent the cable from rotating unnecessarily.

Next, the primary radiator support 3 is assembled to the reflector 1. This operation is performed by inserting the cable bundle into the through holes of the reflector 1 and reinforcing frame 2, as shown in FIG. Connection can be made by tightening.

The parabolic antenna assembled as described above is installed, for example, outdoors on a roof or on the ground using a well-known support device not shown. In this state, microwave radio waves sent from a microwave transmission equipment such as a geostationary satellite constellation (for example, /1 from Himawashi 2,
AM-FM modulated and linearly polarized radio waves)
The light is reflected by the reflecting mirror 1 and focused toward the primary radiator 14 . The focused radio waves are reflected by a reflector and received by an example of a dipole element as is well known. The received signal is taken out to the cable with good matching through the matching section 40, and then sent to the subsequent equipment (converter, receiver, burner computer, etc.) via the cable ω. be guided.

Next, Fig. 1 shows a different embodiment of the present application, and shows an example in which two window holes are formed in the power supply case so that the base of the dipole element and the matching member can be connected more reliably. It shows. In the figure, the window holes 18e are formed in the other two side walls of the power supply case 15e between the side walls L5ae and 15ae to which the dipole element 24e is attached.
The connecting portion 25ae of the element 42ae and the connecting portion 42 b e
are connected by a connecting member 57e.

In addition, in this invention, the parts that are considered to have the same or equivalent configuration as those in the previous figure in terms of function are given the same symbols as in the previous figure, and alpha or higher. (a) When receiving microwaves, incoming The microwave is reflected by a reflecting mirror 1, and then reflected by a pair of dipole elements,
24, which has the effect of efficiently receiving microwaves.

(b) Moreover, since a gasket is interposed between the base of the pair of dipole elements u and 24 and the side wall of the power feeding unit case, even if it rains during use, the water will be absorbed into the case L.
5 can be prevented and stable reception can be achieved.

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and FIG. 1 is a perspective view showing the state of microphone solar wave reception, FIG. 2 is a partial perspective view showing the state in which the primary radiator support is assembled to the reflector, and FIG. Figure 3 is a partially cutaway view of the parabolic antenna, Figure 3 is a partial view of the parabolic antenna cut away in a different direction from Figure 3, and Figure 5 shows the state with the lid removed. FIG. 6 is a sectional view taken along the line Vl-Vl, FIG. 7 is an exploded perspective view for explaining the related structure between the power feeding case, dipole element, and lid, and FIG. Figure 2 is an exploded perspective view to show the relationship with the matching member, Figure 2 is a perspective view showing the state in which the cable and matching member are connected, and Figure 1θ is a set of matching members for the primary radiator (to explain one piece). Fig. 11 is a perspective view similar to Fig. 6 showing a different embodiment.l...reflector, 9...support tube, 14...-order radiator, radiator...4...power supply Case, Separate...Dipole element, 40...Matching member, ■...Window hole, A...Lid.

Claims (1)

[Claims] It consists of a reflector and a primary radiator placed in front of it.
The negative-order radiator has a power supply case and a pair of dipole elements whose bases are fixed to both side walls of the case, and between the side walls of the case and the bases of the dipole elements, there is a waterproof A parabolic antenna characterized by having an intervening antenna.