JPS6027202A - Parabolic antenna - Google Patents

Abstract

PURPOSE:To receive radio waves properly with easy operation independently of the turning direction of a circularly polarized waveby constituting the titled parabolic antenna by a reflector and a primary radiator, and even if an arriving radio wave is a circularly polarized wave, converting the received wave into a linearly polarized wave to receive the radio wave properly. CONSTITUTION:At the reception of an arriving radio wave, the radio wave is reflected by the reflector 4, converged and inputted to the primary radiator 9. Even if the arriving radio wave is a circularly polarized wave, the circularly polarized wave can be converted into a linearly polarized wave and transmitted to a rectangular connection port 14 because a phase difference plate 20 is arranged, so that proper reception can be attained. In addition, the phase difference plate 20 is fitted to a holding cylinder 18 allowed to change its turning direction around the body 11 of the antenna optionally, so that the phase difference plate 20 can be positioned in a proper direction to the connection port 14 even if the turning direction of the circularly polarized wave is left- handed or right-handed. Thus, the convertion of the circularly polarized wave can be properly attained. Since positioning engagement parts are set up on the body 11 and the holding cylinder 18, the circularly polarized wave can be properly received even if its turning direction is right-handed or left-handed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a parabolic antenna adapted to receive 8HF radio waves, and more particularly to a primary radiator in the parabolic antenna.

The purpose of this is to be able to convert incoming radio waves into linearly polarized waves for proper reception even if they are circularly polarized waves, and to be able to receive them properly even if the incoming radio waves are circularly polarized waves. To provide a parabolic antenna which can be brought into a state where it can properly receive signals by easy operation even when the antenna is rotated to the left or left.

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

In FIG. 1 showing a well-known parabolic antenna, 1 is a column, 2 is a parabolic antenna, and a mounting body 3 is used to attach the column l.
It is installed on. In this parabolic antenna 2, 4
is a reflector, 5 is a support arm, 6 is a horizontal support rod, 7 is a wave receiving device,
It consists of a converter 8 and a primary radiator 9 attached to it.

Next, in FIGS. 2 to 6 which show the structure of the above-mentioned -order radiator 9 in detail in relation to the converter 8, 10 is a case of the converter 8, and a case 10 is made of a material having good conductivity, such as aluminum. It is shaped like a reed and has a converter circuit inside. Next, in the primary radiator 9, a cylindrical main body 11 is formed using a metal material with good conductivity such as copper, brass, or aluminum.

The branch is a flange provided at one end of the main body H, and is attached to the case 10 using a set screw B. Reference numeral 14 denotes a connection port, which is formed in a rectangular shape on the ladder constituting the rectangular waveguide, and is connected to the case 10.
It is polymerized with the connection port 10a in . Reference numeral 15 denotes a connecting portion, which is formed with a male thread. 16 indicates the packing receiving surface. Reference numeral 17 denotes a step-up adapter, which is used as is well known to align a rectangular waveguide and a circular waveguide, and is made of a metal material with good conductivity. On the other hand, it is integrally fixed with adhesive to form a ladder that forms part of the main body. Next, the yoke is a holding cylinder, which is made of a metal material with good conductivity similar to that of the main body U.
1, it is formed into a cylindrical shape that can be freely inserted and removed and rotated. 1
Reference numeral 9 denotes a packing receiving surface on the holding cylinder, which is formed into a tapered shape as shown in the figure. Additionally, there is a retardation plate, which is fixed to the inner surface of the holding cylinder. This retardation plate material is made of polystyrene, polystyrene, etc., which has a dielectric constant of 2. Hiroj-
At 2,63, -S is /~3x/θ-4 (in sales)
Moreover, it is formed into a plate shape using a material that is easy to process and has good high frequency characteristics. Incidentally, for example, an adhesive is used for the fixing. Next, a pair of retaining portions provided between the holding cylinder and the main body 11 (the stethoscope lifter 17) will be described. (2) is a protrusion (pin) exemplified as a retaining portion provided on the holding cylinder, and a spring wave pin is used. Note that any other metal pin may be used as the protruding piece 21. 22. Reference numeral Z3 denotes four retaining parts provided on the step-up adapter 17, which are formed to a size that allows the protruding piece 4 to fit therein.

Also these engagement four parts.

When the projecting piece 21 is engaged with the engagement recess η, the retardation plate has the shuttle positional relationship shown in FIG. In addition, when the protruding piece 21 is engaged with the engaging recess n, the retardation plate is aligned with the connection port 14 in the correct position as shown in FIG. The antenna should be formed in a location that is oriented in a direction suitable for receiving radio waves. Next, reference numeral 5 denotes a fixture, which is formed into a cylindrical shape using a metal material with good conductivity. In addition to this fixture part, there is a connecting part, which is formed with a female thread that engages with the connecting part 15. 27
indicates the packing pressing part, and the bottom indicates the inner flange-shaped holding part. Numeral 4 is a gasket, which is made of rubber or other material with good elasticity, and is sandwiched between the receiving surface 16 and the suppressing portion I. (9) is a packing made of the same material as the packing 4. The reference numeral 31 indicates a flat plate-like plate made of a conductive material. As the electrocardiographic material, for example, silicone rubber mixed with metal powder having good electrocardiographic properties, such as iron, is used. This packing 31 is used to ensure waterproofness and to reconcile electrical discontinuities within the holding cylinder 18. The wings are closed bodies and are used to make the main body 11 or the inside of the holding cylinder waterproof and dustproof.Even though they are thin, they have strong mechanical strength and are difficult to deform, and they also have good high frequency characteristics (transmission of radio waves). For example, material with good properties/2
A polyimide plate material with a thickness of approximately J microns is used. Moreover, this closing body 32 is made of brown color, so that the weather resistance of various members provided inside the closing body 32 is enhanced. In addition, the above-mentioned closed body wings are made of mica plate, which is good.

In the case of the above configuration, as shown by arrow A in Fig. 1, the S
The circularly polarized radio waves are reflected by the reflecting mirror 4 as shown by arrow B and converge toward the -eg radiator 9. This radio wave passes through the perforation field of the identification tool δ in the primary radiator 9 and enters the holding cylinder J8.

As the radio waves pass through the holding cylinder, the circularly polarized waves are converted into linearly polarized waves, and the converted radio waves pass through the step-up adapter 17 to the connection port 4, and then from the connection port 14. It enters the Kosoverter 8 through the connection port 10B. The radio wave that entered the converter 8 is converted into a UHF or VHF signal, and the converted signal is
The information is sent to a receiving device (for example, a television receiver) not shown through a well-known transmission line (for example, a coaxial cable) not shown.

Next, when the rotation direction of the circularly polarized wave and the orientation of the phase difference Iida with respect to the connection port 14 are closely matched, the orientation of the phase difference Iida is changed as follows. Such a change may occur if the direction of rotation of the radio waves of multiple TV channels sent from one broadcasting satellite is different for each channel, such as clockwise or counterclockwise, or if multiple TV channels are transmitted from multiple broadcasting satellites. This is done when radio waves are sent in a right-handed or left-handed state, respectively, and you want to receive a left-handed radio wave after receiving a right-handed radio wave, or vice versa. When performing this change operation, for example, when changing from the state of receiving right-handed radio waves as shown in Figure 5 to the state of receiving left-handed radio waves as shown in Figure 6, first remove the fixing device. 5 and remove it from the main body ■. After that, as shown in Fig. 3, hold the holding tube with your fingertips and adjust the holding tube to the main body U with a slight dimension, that is, the protrusion 4.
Pull out the holding tube by a length that removes it from the engagement recess B, and then rotate the holding tube by θ° to the right or left.

As a result, the protruding piece 4 is placed in a state where it faces the engagement recess η.

Then, from that position, the holding cylinder k is pushed into the main body 11 again. In this case, even if the protruding piece 21 does not face the engagement recess η correctly, the protruding piece can be easily removed by slightly rotating the holding cylinder left and right while pushing the holding cylinder towards the inside of the main body H. can be engaged with the retaining portion n. After changing the orientation of the holding cylinder 18 to this shuttle, the fixture z5 is again screwed onto the main body 11 in the loose state shown in FIG. This allows the conversion operation to be completed.

In addition, when changing from a left turn to a right turn, the same operations as above can be used.

Next, the pair of engaging portions 21. Regarding the structure of the engaging portions η and 23, the holding tube can be inserted and removed from the main body H at the position where the holding tube is turned clockwise or counterclockwise by θ degrees, respectively, and the holding tube can be inserted into and removed from the main body H. In addition to the loose structure shown in the drawings, any other arbitrary structure may be used as long as it has a suitable structure that allows rotational positioning in a closed state. That is, for example, on the outer circumferential surface of the holding tube 8, two grooves parallel to the axis of the holding tube are mutually aligned with respect to the axis.

It is formed parallel to the closed position, and on the inner circumferential surface of the main body 11 (
A single protrusion may be formed that selectively engages the two grooves, and in the engaged state, allows the holding cylinder 18 to be inserted and removed, but prevents rotation. Alternatively, the cross-sectional shapes of the inner surface of the main body 11 and the outer surface for the holding cylinder (cross section in a plane perpendicular to the axis of the holding cylinder) may be formed into corresponding equilateral shapes.

Next, FIG. 7 shows a different embodiment of the present invention, and shows an example of a taper packing in which the gasket 31 and the gasket 31 are integrated into one body. In this case, the packing material is preferably made of the same material as the packing material 31.

As described above, in this invention, (a) When receiving an incoming radio wave, the radio wave can be reflected by the reflecting mirror 4, converged, and manually transmitted to the primary radiator 9, and can be received with high gain. There is an effect that can be done.

(b) Moreover, in the case of the above reception, since the phase difference plate is provided, even if the incoming radio wave is a circularly polarized wave, it can be converted into a linearly polarized wave and transmitted to the rectangular connection port 14, This has the effect of allowing proper reception.

(c) Furthermore, in the above case, since the phase difference Iida is fixed to the holding barrel which can be freely repositioned in the rotational direction with respect to the main body 11, even if the rotation direction of the circularly polarized wave is left-handed, Alternatively, even in the case of right rotation, the phase difference Iida can be positioned in a suitable direction with respect to the connection port 14, which has the effect of appropriately performing the conversion.

2) Furthermore, since the main body ■ and the holding unit are equipped with an engaging part for positioning, if you try to receive left-handed radio waves after receiving right-handed radio waves, or In the opposite case, simply pull out the holding cylinder 18 from the main body 11, rotate it, and push it in again to achieve the state shown in (c). Proper reception of (b) can be achieved with easy operation. It has the effect of

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and Fig. 1 is a side view of a disassembled antenna, Figs. 2 and 2 are longitudinal sectional views of the primary radiator, and Fig. 3 is a partially cutaway perspective view of the primary radiator. , Figure 5 is a perspective view showing the situation of the changing operation, Figures 5 and 6 are right rotation, respectively.
1 wave of left-handed circularly polarized wave is transferred to 4...Reflector, 9...-order radiator, ■...Main body, Moon...Holding cylinder, W...Retardation plate, Mu. η, 23...Engagement part. Figure 1 Figure 2 Figure 4 Figure 5 Figure 6' Figure r7

Claims (1)

[Claims] Consisting of a reflector and a primary radiator placed in front of it,
Radio waves arriving from the front of the reflector toward the reflector are reflected by the reflector, converged in the primary radiator, input from the opening of the -order radiator, and transmitted into the -order radiator. In a parabolic antenna that transmits data to the next stage through a rectangular connection port, the opening side of the secondary radiator has a cylindrical main body, which can be freely inserted into and removed from the main body, and which rotates in the direction of rotation with respect to the main body. The retardation plate is fixed to the inside of the holding tube, and the connection between the main body and the holding tube is fixed to the inside of the holding tube. The orientation of the retardation plate relative to the mouth can be adjusted to suit receiving left-handed radio waves and right-handed radio waves, and the holding tube can be inserted into and removed from the main body, respectively. A parabolic antenna characterized in that it is provided with a pair of retaining parts that can be positioned in a rotational direction while being inserted.