Micropower intelligent digital directional cellphone signal shielding device

Abstract

The invention discloses a micropower intelligent digital directional cellphone signal shielding device, which comprises a programmable logic array, a digital-to-analog converter, at least one channel, an attenuation circuit, a mixing module, a filtering module, an amplifying module and a directional antenna, wherein the programmable logic array is used for generating a baseband modulation signal; the digital-to-analog converter is connected with the programmable logic array, and is used for converting the digital baseband modulation signal generated by the programmable logic array into an analog signal; the at least one channel is connected with the digital-to-analog converter; each channel comprises the attenuation circuit connected with the digital-to-analog converter and the mixing module connected with the attenuation circuit, a local oscillation signal is generated by means of a phase-locked source and a voltage-controlled oscillator and is sent to the mixing module, and the mixing module is used for converting the frequency of an intermediate frequency signal converted by the digital-to-analog converter into a required channel; the filtering module connected with the mixing module is used for filtering the signal generated by the mixing module; the amplifying module connected with the filtering module is used for amplifying the signal filtered by the filtering module; and the directional antenna connected with the amplifying module is used for transmitting channel power. The micropower intelligent digital directional cellphone signal shielding device has the advantages of good shielding effect, low radiation and the like.

Description

technical field [0001] The invention relates to the technical field of mobile communication and shielding, and more specifically relates to a micro-power intelligent digital directional mobile phone signal shielding device. Background technique [0002] In recent years, mobile communication technology has developed rapidly, from 2G and 3G to 4G. The development of mobile communication technology has greatly promoted the penetration rate of smart phones. The popularization of smart phones has brought great convenience to people's life, but at the same time, in some special occasions, these smart phones have also become A tool for leaking secrets and cheating is hard to guard against. Therefore, in these special neighborhoods, the application of shields is very necessary. [0003] The working principle of the jammer is: in the channel where the mobile phone works, an interference signal is generated, making it impossible to recognize the normal signal of the base station, so...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages. First, at the same time, only one point in the working channel is interfered. For spread spectrum communications such as WCDMA and LTE, the interference effect is extremely poor and cannot meet the application requirements; second, even GSM, etc. Narrowband signals also need to generate higher power to achieve the shielding effect. Too high power radiation will also have adverse effects on the human body; third, due to the change of VCO and other analog devices with temperature, there will be temperature drift, resulting in frequency fluctuations. Accurate, so that the interference effect cannot be achieved; Fourth, because this method requires relatively large radiation power, power amplifiers, power supplies and other power devices work at full load for a long time, the stability is extremely poor, and they are easy to be damaged. Once damaged, it will not be able to achieve Interference effect, causing maintenance inconvenience and high cost

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