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Low nose block frequency changer having multiple local oscillator

A technology of local oscillators and low-noise blocks, applied in resonators, waveguide devices, active electrical relay systems, etc., can solve problems such as difficulty in reducing the size of the metal shielding box 40, and achieve a compact size

Inactive Publication Date: 2004-05-19
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to reduce the size of the metal shielding box 40, thereby reducing the size of the low-noise block down-converter

Method used

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  • Low nose block frequency changer having multiple local oscillator
  • Low nose block frequency changer having multiple local oscillator
  • Low nose block frequency changer having multiple local oscillator

Examples

Experimental program
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Embodiment Construction

[0019] exist figure 1 Among them, a satellite receiving system according to an embodiment of the present invention includes a broadcasting satellite 1 , an antenna 2 , an LNB 3 , an IF (Intermediate Frequency) cable 4 , a DBS (Direct Broadcast Satellite) tuner 5 , and a TV set 6 .

[0020] The following will figure 1 The operation of the shown satellite receiving system is described. The 12 GHz band radio waves (10.70-12.75 GHz) emitted from the broadcasting satellite 1 are received by the antenna 2 . The received radio waves are frequency-converted by the LNB 3 mounted on the antenna 2 to become an intermediate frequency signal in the 1 GHz band (950-2150 MHz), and low-noise amplification is performed by it. The IF signal output by the LNB3 is introduced into the room through the IF cable 4 , and is demodulated by the DBS tuner 5 into a video signal and an audio signal, and then transmitted to the TV set 6 .

[0021] exist figure 2 The general LNB3 includes a waveguide...

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Abstract

In the low noise converter (3), a shield chamber (20a) in a metallic shield box (20) contains two local oscillators (13a, 13b), and a conductor rod (25) is placed between two dielectric resonators (21a, 21b) included in the local oscillators (13a, 13b). The conductor rod (25) prevents electromagnetic field coupling between the two dielectric resonators (21a, 21b). Thus, the converter can be downsized more in comparison with those of the low noise converters of prior arts wherein two local oscillators (13a, 13b) are completely separated by a metallic wall (40c).

Description

technical field [0001] The present invention generally relates to a low noise block downconverter. More specifically, the present invention relates to a low noise block downconverter for satellite reception systems. Background technique [0002] In a conventional low noise block downconverter with multiple local oscillators (hereinafter referred to as "LNB"), each local oscillator is completely isolated from the other oscillators by a metal barrier, thereby to prevent electromagnetic coupling between the dielectric resonators in each local oscillator and the dielectric resonators in other local oscillators. [0003] Figure 7A and Figure 7B The sectional view in represents the main part of a normal LNB. Figure 7A is along Figure 7B sectional drawing made on line VIIA-VIIA in , and Figure 7B along the Figure 7A A cross-sectional view taken along the line VIIB-VIIB in . [0004] exist Figure 7A and Figure 7B , the two local oscillators 41a and 41b of the LNB are r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/20H01P1/208H01P7/10H01Q1/24H04B1/00H04B1/16H04B1/18H04B7/15
CPCH01Q1/247H01P1/2084
Inventor 本山幸次
Owner SHARP KK