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Method for shielding signals of mobile phone and portable wireless instrument for emitting multitone jamming

A signal, intermediate frequency signal technology, applied in the field of communication, can solve the problems of restricting the use range of the instrument, large size, inconvenient movement, etc., and achieve the effect of reducing electromagnetic radiation pollution, saving radio frequency energy, and expanding the scope of use

Inactive Publication Date: 2009-09-23
北京嘉德宝业科技发展有限公司
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Problems solved by technology

[0002] At present, the public security and other departments use the method of shielding all kinds of mobile phone signals, which is to use the continuous scanning method to interfere in all the known frequency bands of the mobile phone. This method requires high-power radio frequency energy, large volume and heavy weight. , it is inconvenient to move in an explosion-proof and explosion-proof environment, which restricts the scope of use of the instrument. Continuous work for a long time, strong microwave radiation to the human body, is harmful to human health and electromagnetic radiation pollution to the surrounding area, and will also interfere with some civilian broadcasting frequency bands

Method used

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  • Method for shielding signals of mobile phone and portable wireless instrument for emitting multitone jamming

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Embodiment Construction

[0017] The specific structure of the portable wireless transmitting multi-frequency jammer of the present invention is shown in the accompanying drawings, which is composed of a signal acquisition part and a transmitting part. The signal acquisition mainly includes an antenna ANT1, a signal filter BPF1, a signal front-end processor U1, a reference oscillator VCO1, a receiving Local oscillator phase-locked loop U4, direct frequency synthesizer U5, intermediate frequency filter BPF2, intermediate frequency demodulation U2, central processing unit U3;

[0018] The central processing unit U3 is connected to the local oscillator phase-locked loop U4 through the data bus, and the receiving local oscillator phase-locked loop U4 is connected to the reference oscillator VCO1 through the resistor R3 to output the reference frequency, and connected to the direct frequency synthesizer (DDS) U5 through the capacitor C5 , while connecting to the front-end processor U1 through the capacitor C...

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Abstract

A method for shielding signals of a mobile phone and a portable wireless instrument for emitting multitone jamming, which is characterized in that within known working bandwidth, practically effective working frequency points and frequencies of the mobile phone are scanned and collected so as to save radiofrequency energy; the analysis and control are carried out by a central processing unit so as not to jam the remained frequency points and frequency bands non-complying with the requirements. Within the equal distance with the interference effect ensured, the radiation of the microwave to human is greatly reduced, the electromagnetic radiation pollution to the circumference is relieved, and the design with reduced power dissipation, lightened weight and reduced volume lightens the instrument, thus enlarging the application scope of the instrument.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to a wireless transmitting multi-frequency jammer and a method for shielding mobile phone signals. Background technique [0002] At present, the public security and other departments use the method of shielding all kinds of mobile phone signals, which is to use the continuous scanning method to interfere in all the known frequency bands of the mobile phone. This method requires high-power radio frequency energy, large volume and heavy weight. , It is inconvenient to move in an explosion-proof and explosion-proof environment, which restricts the scope of use of the instrument. Continuous work for a long time, strong microwave radiation to the human body, is harmful to human health and electromagnetic radiation pollution to the surrounding area, and will also interfere with some civilian broadcasting frequency bands. content of the invention; [0003] The purpose o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/00H04K3/00
Inventor 陆贻东魏伟
Owner 北京嘉德宝业科技发展有限公司
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