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Low-noise frequency-converter

A low-noise, low-noise amplification technology, applied in the field of low-noise frequency conversion devices, can solve problems such as area enlargement, circuit scale enlargement, and degree of freedom decrease

Inactive Publication Date: 2004-12-22
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the number of coupling circuits increases, the area for constructing the coupling circuits on the circuit board increases, the degree of freedom in the circuit diagram of circuit components becomes smaller, and the circuit scale increases

Method used

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Embodiment Construction

[0051] Hereinafter, three embodiments of the present invention will be described with reference to the drawings. First, the first embodiment among them will be described. Figure 4 The structure of the first embodiment is shown.

[0052] in Figure 4 Among them, reference numerals 11 and 12 indicate current feeding devices for receiving signals from one satellite, and 13 and 14 indicate current feeding devices for receiving signals from another satellite. Two satellites located in adjacent positions on a geostationary satellite orbit use a frequency band such as 12 GHz to transmit radio waves with horizontally polarized waves and vertically polarized waves. A parabolic antenna receives radio waves from two satellites.

[0053] Between receiving and outputting, a signal from a satellite is input to the current feeding devices 11 and 12, and the horizontally polarized wave and vertical polarized wave reception signals of one satellite are extracted from the current feeding devices 1...

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Abstract

Radio waves from a plurality of satellites can be received by one antenna, thereby realizing a miniaturization and a reduction of costs. A reception signal of a horizontally polarized wave and a reception signal of a vertically polarized wave from one satellite are amplified by low noise amplifiers 21 and 22. A reception signal of a horizontally polarized wave and a reception signal of a vertically polarized wave from another satellite are amplified by low noise amplifiers 23 and 24. One of the low noise amplifiers 21 to 24 is selected in accordance with the polarized wave and the satellite and the signal from the selected low noise amplifier is supplied to a low noise amplifier 4 through a coupling circuit 3. An output of the low noise amplifier 4 is frequency converted by a local oscillator 7 and a mixer 6. In this manner, a plurality of coupling circuits needed in a conventional apparatus are constructed by one coupling apparatus 3, thereby realizing the miniaturization.

Description

Technical field [0001] The present invention relates to a low-noise frequency conversion device, which is suitable for use in situations such as receiving radio waves from multiple satellites by a parabolic antenna. Background technique [0002] A satellite broadcasting receiving system is equipped with a low-noise frequency converter (called LNB), which is used to convert signals in a frequency band such as 12GHz received by a parabolic antenna into an intermediate frequency signal in a frequency band such as 1GHz, and connect it through a connecting cable. The signal is sent to an indoor IRD (Integrated Receiver Decoder) or a receiver such as a television receiver, VTR, or similar device with a satellite broadcast reception tuner. figure 1 Shows an example of such a conventional low-noise inverter. [0003] in figure 1 In, reference numerals 111 and 112 denote current feed devices, and a satellite located in a geostationary orbit uses radio waves having an orthogonal relation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q1/24H01Q5/00H01Q5/45
CPCH01Q1/247H01Q5/0079H01Q5/45
Inventor 平林克己田中正幸
Owner SONY CORP
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