JPH036003Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Technical Field] The present invention relates to a satellite receiving device used, for example, as a primary radiator of a parabolic antenna for receiving DBS.

[Prior Art and Its Disadvantages] Generally, a parabolic antenna includes a primary radiator for inputting received radio waves reflected and focused on a reflecting mirror surface. 3A and 3B show the side and front configurations of the parabolic antenna, respectively. In the figures, 11 is a reflecting mirror surface that receives and focuses satellite radio waves, 12 is a radiator that inputs the focused received radio waves, and 13 is a low noise block converter (LNB), and a primary radiator consisting of a radiator 12 and a converter 13 is attached to the reflecting mirror surface 11 via a support arm 14 and a stay 15. Reference numeral 16 designates a mounting bracket for the reflective mirror surface 11, 17 an elevation angle adjustment knob, 18 an azimuth adjustment knob, and 19 an azimuth adjustment bracket. That is,
In this parabolic antenna, the radiator 1
By making the radio wave input direction of No. 2 coincide with the focal direction x of the reflective mirror surface 11, it becomes possible to receive satellite radio waves corresponding to the radio wave reception range l.

However, in the primary radiator configured as described above, its longitudinal direction is the same as the input direction of the received radio waves, so this radio wave input direction is
1, the primary radiator will inevitably be fixed horizontally in space,
For example, when used in a snowy area, the entire primary radiator is covered with snow S, as shown in FIG. 4, which shows the area surrounded by the broken line a in FIG. If snow adheres to the radio wave input section, reception sensitivity will decrease and there is a risk that reception may become impossible.

Furthermore, as shown in FIG. 5, this primary radiator has a die-cast primary horn part 21 and a circularly polarized wave generator 22 on the radiator 12 side, and a metal housing 24 containing a converter part 23 on the converter 13 side. Since the radiator 12 side and the converter 13 side are connected via a waveguide flange, they are easily affected by flooding, crosswinds, vibrations, etc., and require high precision machining. The disadvantage is that it is required and costly.

[Purpose of the invention] The present invention was developed in view of the above-mentioned drawbacks, and even in snowy areas, the input part of the received radio waves is not covered by snow, thereby preventing the reception sensitivity from decreasing, and also preventing the reception from flooding, crosswinds, vibrations, etc. The purpose is to provide satellite receiving equipment that is less susceptible to interference.

[Key Points of the Invention] In other words, the satellite receiving device according to the present invention includes a patch-type printed horn section that receives satellite radio waves that are reflected and focused by a reflecting mirror surface of a parabolic antenna;
A flexible coaxial tube connects the input/output terminals of the patch-type printed horn section and the low-noise block converter board by making the angle of incidence of radio waves on the horn section variable. and a casing which integrally accommodates the low-noise block converter board and is erected substantially parallel to the reflective mirror surface of the parabolic antenna with the side surface facing the direction of incidence of the satellite radio waves.

[Embodiment of the invention] An embodiment of the invention will be described below with reference to the drawings.

Fig. 1 shows its configuration. In the figure, 31 is a patch-type printed horn section, and 32 is a patch-type printed horn section.
SHF low noise block converter board,
The patch type printed horn section 31 and the SHF low noise block converter board 32 are installed with their respective ground planes facing each other, and each input/output terminal is connected by a flexible coaxial tube 33. Here, the outer conductor surface of the flexible coaxial tube 33 and the ground surfaces of the horn portion 31 and the converter board 32 are firmly connected and fixed by soldering, and each ground surface is completely grounded.

34 is an IF amplification section, 35 is a chassis section,
A patch type printed horn section 31, a low noise block converter board 32, a flexible coaxial tube 33, which are integrated using this chassis section 35 as a base,
The IF amplifying section 34 is housed all together in a rectangular parallelepiped die-cast case 36.
An output terminal 37 is provided on the lower end surface of the. An opening for receiving radio waves is formed on the side surface of the case 36 corresponding to the patch pattern surface of the patch type printed horn section 31, and this opening is closed with a plastic window section 38 having a low dielectric constant.

That is, when using the satellite receiving device with the above configuration as the primary radiator 30 of a parabolic antenna, first, as shown in FIG. The parabolic antenna is erected so that the incident direction, that is, one side surface on which the plastic window portion 38 is provided, is substantially parallel to the reflecting mirror surface 11 of the parabolic antenna. Here, the angle of incidence of the received radio waves by the patch-type printed horn section 31 is made to coincide with the focal direction x of the reflecting mirror surface 11 in advance by adjusting the flexible coaxial tube 33. In this state, the primary radiator 30
This means that the horizontal surface area of the die-cast case 36 is minimized, and the direction of radio wave incidence on the patch-type printed horn section 31 is adjusted. 42 is a pillar, 43
is the basis of antennas.

In other words, it is incident from the satellite direction y, and the reflecting mirror surface 11
The received radio waves reflected and focused in Case 36
The light enters the patch pattern surface of the patch type printed horn section 31 through the plastic window section 38 on the side surface,
The signal is taken out from the output terminal 37 via the flexible coaxial tube 33, the low noise block converter board 32, and the IF amplification section 34. In this case, the patch-type printed horn section 31 and the low-noise block converter board 32 are completely grounded and connected by soldering via the flexible coaxial tube 33, so that the radiation loss can be suppressed to a minimum.

Therefore, according to the satellite receiving device having the above configuration, even if the radio wave incident direction of the patch-type printed horn section 31 is made to match the focal direction x of the reflecting mirror surface 11,
Since the radio wave input section of the die-cast case 36 is configured to be substantially perpendicular to the ground, the radio wave input section will not be covered with snow even in a snowy area, and there is no risk of deterioration of reception sensitivity.
In addition, a patch-type printed horn section 31 is used in place of the conventional primary horn section, and the patch-type printed horn section 31 and the low-noise block converter board 32 are connected by soldering via a flexible coaxial tube 33. An assembled structure can be obtained and a significant cost reduction can be achieved. Furthermore, by integrally incorporating the horn part 31 and the converter board 32 into one die-cast case 36, a highly airtight housing structure can be obtained, and the primary radiator is less susceptible to the effects of flooding, crosswinds, vibrations, etc. can be realized.

[Effects of the invention] As described above, according to the invention, there is a patch type printed horn section into which satellite radio waves reflected and focused by the reflecting mirror surface of a parabolic antenna are input, and a patch type printed horn section and a low noise block converter board. A flexible coaxial tube that connects the input and output terminals by making the angle of incidence of radio waves of the horn section freely variable, and a patch-type printed horn section and a low noise block converter board connected through the flexible coaxial tube are integrally housed in the above parabolic antenna. The structure includes a housing that stands approximately parallel to the reflective mirror surface of the satellite with the incident direction of the satellite radio waves on the side, so that even in snowy areas, the input part of the received radio waves will not be covered by snow, allowing reception. It is possible to provide satellite receiving equipment that prevents a decrease in sensitivity and is less susceptible to the effects of flooding, crosswinds, vibrations, etc.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing a satellite receiving device according to an embodiment of the present invention, FIG. 2 is an arrangement configuration diagram showing a case where the satellite receiving device in FIG. 1 is used as a primary radiator of a parabolic antenna, and FIG. 3 A and B are a side view and a front view, respectively, showing a parabolic antenna equipped with a conventional primary radiator, Figure 4 is a diagram showing the primary radiator in Figure 3 covered with snow, and Figure 5 is a converter. FIG. 2 is an external configuration diagram showing a conventional primary radiator using a primary horn part that requires a waveguide flange for connection with the main part. 11...Reflecting mirror surface, 31...Patch type printed horn section, 32...Low noise block converter board, 33...Flexible coaxial tube, 35...
Chassis portion, 36...Die-cast case, 37...
...Output terminal, 38...Plastic window, 41...
...Support arm, x...Reflector focal point direction.

Claims (1)

[Scope of utility model registration request] A patch-type printed horn section receives satellite radio waves reflected and focused by a reflecting mirror surface of a parabolic antenna, and a radio wave incident angle of the horn section is made variable between the input and output terminals of the patch-type printed horn section and a low noise block converter board. A flexible coaxial tube connected via the flexible coaxial tube, a patch-type printed horn section and a low-noise block converter board connected via the flexible coaxial tube are integrally housed, and the satellite radio wave incident direction is placed on the side of the reflecting mirror surface of the parabolic antenna. 1. A satellite receiving device comprising: a casing erected in parallel;