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Primary radiator, low noise block down-converter, and parabolic antenna apparatus

A parabolic antenna, low-noise block technology, applied in antennas, radiating element housings, waveguide horns, etc., can solve the problems of difficult bandwidth to suppress VSWR, and it is difficult for antennas to obtain cross-polarization characteristics, achieve good cross-polarization characteristics, and achieve small The effect of increasing and increasing the radiation angle

Inactive Publication Date: 2009-03-04
SHARP KK
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the above-mentioned conventional primary radiator 110 for a horn antenna, although the VSWR can be suppressed for frequencies with a bandwidth of about 500 to 800 MHz, there is a problem that it is difficult to suppress the VSWR for a bandwidth up to 1050 MHz.
Moreover, if good characteristics of suppressing VSWR cannot be obtained, there is also the problem that it is difficult to obtain cross-polarization characteristics of 23dB or more for the antenna as a whole

Method used

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  • Primary radiator, low noise block down-converter, and parabolic antenna apparatus
  • Primary radiator, low noise block down-converter, and parabolic antenna apparatus
  • Primary radiator, low noise block down-converter, and parabolic antenna apparatus

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Embodiment Construction

[0031] Next, Embodiment 1 of the present invention will be described with reference to FIG. 1 . In FIG. 1, a primary radiator 10 for a parabolic antenna according to Embodiment 1 is constructed as follows. The horn antenna main body 11 is formed in a cylindrical shape, and the horn cap 12 is attached to the conically expanding front end opening 11a by press-fitting. A waterproof O-ring 13 is fitted between the front end opening 11 a of the horn antenna main body 11 and the horn cap 12 .

[0032] On the inner wall surface of the horn cap 12, a protruding portion 15 including two cylindrical portions 16, 17 made of electrolyte is provided. on the axis concentric with the central axis. Furthermore, the height of the inner cylindrical portion 16 from the inner wall surface of the horn cap 12 is formed higher than that of the outer cylindrical portion 17 .

[0033] With such a structure, the outer low cylindrical portion 17 can suppress high-frequency VSWR, and the inner high cy...

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Abstract

A primary radiator for a parabolic antenna includes a cylindrical horn antenna body (11) widened towards an end opening in a cone shape, a horn cap (12) provided at the end opening of the horn antenna body, and a plurality of cylindrical protruding portions (15) formed of a dielectric. The protruding portions (15) are provided on the inner wall surface of the horn cap (12), concentric with a central axis of the horn antenna body (11), and concentrically arranged with each other, and the height of an inner one is determined to be higher than an outer one. According to such a configuration, a primary radiator for a parabolic antenna configured to favorably suppress the VSWR up to a bandwidth of 1050 MHz can be provided.

Description

technical field [0001] The present invention relates to a primary radiator for a parabolic antenna, a low-noise block down-converter (hereinafter referred to as "LNB" (Low Noise Block down-converter)), and a parabolic antenna device for satellite broadcasting using these, and particularly relates to improvement in standing The structure of the primary radiator for VSWR (Voltage Standing Wave Ratio). Background technique [0002] Figure 9 A simplified diagram of a general parabolic antenna is shown in , Figure 10 A sectional view of a conventional primary radiator for a parabolic antenna is shown in . Reception of satellite broadcasting using parabolic antennas such as Figure 9 As shown, the signal S in the frequency band of about 12 GHz reflected by the antenna unit 1 is concentrated on the opening of the primary radiator 110 . Then, use LNB2 to convert the frequency of the signal passing through the primary radiator 110 from the 12GHz frequency band to the 1GHz frequen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q13/02H01Q19/12
CPCH01Q19/132H01Q1/42H01Q13/02H01Q19/08
Inventor 下井浩奥利明
Owner SHARP KK
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