CN207283566U

CN207283566U - Cellular phone signal shielding device

Info

Publication number: CN207283566U
Application number: CN201720581757.3U
Authority: CN
Inventors: 李胜朝; 王利强
Original assignee: Hangzhou Bai Leni Communication Equipment Co Ltd
Current assignee: Hangzhou Niman Communication Co., Ltd
Priority date: 2017-05-18
Filing date: 2017-05-18
Publication date: 2018-04-27
Anticipated expiration: 2027-05-18

Abstract

The utility model provides a kind of cellular phone signal shielding device, belongs to field of communication technology.It solves the problems, such as that the prior art is high there is use cost.This cellular phone signal shielding device includes the internal housing for cavity, there is receiving module, sending module, clock module, CPU control modules, storage forwarding module and power module in the housing, above-mentioned clock module is used to provide the required clock of work to receiving module, sending module, storage forwarding module, above-mentioned receiving module is used to receive each mobile communication frequency range circulation of existing net and is converted into digital signal, and above-mentioned storage forwarding module is used to be filtered the data of digital signal and handle its storage.This cellular phone signal shielding device small power consumption and to base station disturb it is small.

Description

Cellular phone signal shielding device

Technical field

The utility model belongs to field of communication technology, is related to a kind of cellular phone signal shielding device.

Background technology

For existing traditional cellular phone signal shielding device mostly using simulation frequency sweep scheme, basic principle is to use signal oscillating Device produces the signal of mobile communication frequency range, and the shielding to mobile phone signal is realized by the method for high-power compacting.

Hardware configuration includes sawtooth wave generating circuit, voltage controlled oscillator, frequency band filter, signal amplifier and transmitting day Line.This method realizes the mode of mobile phone shielding, it usually needs the power ratio that shielding device is sent shows net signal greatly at least 20dB It can achieve the purpose that effectively to disturb.The radiation of this method is big, and power consumption is big, big to human injury, with of high cost in shield ranges, together When have very big interference to base station.

Utility model content

The purpose of this utility model is in view of the above-mentioned problems existing in the prior art, there is provided one kind interference is strong and cost compares Low cellular phone signal shielding device.

The purpose of this utility model can be realized by following technical proposal：

A kind of cellular phone signal shielding device, including the internal housing for cavity, it is characterised in that have in the housing and receive Module, sending module, clock module, CPU control modules, storage forwarding module and power module, above-mentioned clock module are used to give Receiving module, sending module, storage forwarding module provide the required clock of work, and above-mentioned receiving module is used for each of existing net A mobile communication frequency range circulation receives and is converted into digital signal, and above-mentioned storage forwarding module is used for the number of digital signal According to being filtered and handle its storage, above-mentioned storage forwarding module stores digital signal to setting under the action of clock module Retransmited after fixing time to sending module, above-mentioned sending module is used for the digital signal after keeping in and is modulated after digital-to-analogue conversion To radio frequency and send, above-mentioned sending module with some sendaisles and each sendaisle with corresponding signal band, on State the configuration that CPU control modules are used to control sendaisle in sending module.

Receiving module circulation receives the downlink mobile phone signal of different frequency range, when storage forwarding module store one section Between, it is then forwarded to sending module.Clock module is used for providing work institute to receiving module, sending module, storage forwarding module The clock needed.The configuration of CPU module control sending module and working method, power module part are used for changing modules work Make required voltage.

In above-mentioned cellular phone signal shielding device, the receiving module include be connected in turn reception antenna, Six select a RF switch, dielectric filter, low-noise amplifier, rf gain adjuster, frequency mixer and analog-digital converter.

In above-mentioned cellular phone signal shielding device, the sending module digital analog converter, modulator, fader, Gain-adjusted amplifier, power amplifier, duplexer and transmission antenna.

In above-mentioned cellular phone signal shielding device, the quantity of the sendaisle is six.

In above-mentioned cellular phone signal shielding device, the clock module includes clock reference crystal oscillator, phase-locked loop chip, GPS Chip and VCXO chips.

In above-mentioned cellular phone signal shielding device, the storage forwarding module includes SDRAM storage chips and Base-Band Processing Chip.

In above-mentioned cellular phone signal shielding device, the downlink mobile phone letter for receiving different frequency range is circulated with receiving channel all the way Number, six road sendaisles are forwarded to after baseband processing module is stored, the mobile phone shielding signal of above-mentioned forwarding is more than original Signal.

Compared with prior art, this cellular phone signal shielding device receives existing net signal, is sent after storing a period of time Go out, so as to fulfill mobile phone signal normally decoded purpose is upset.It is moreover, big by the mobile phone shielding signal that this shielding device forwards In original signal, so as to achieve the purpose that the mobile phone shielding signal of forwarding is more than original signal and can be achieved effectively to shield.

Meanwhile it is the small, small power consumption of this shielding device radiation, weak to human injury, and cost is shielded than relatively low, while to base station Disturb smaller.

Brief description of the drawings

Fig. 1 is the system block diagram of this cellular phone signal shielding device.

Fig. 2 is receiving module hardware structure diagram in this cellular phone signal shielding device.

Fig. 3 is sending module hardware structure diagram in this cellular phone signal shielding device

Fig. 4 is storage forwarding module hardware structure diagram in this cellular phone signal shielding device

Fig. 5 is clock module hardware structure diagram in this cellular phone signal shielding device.

Embodiment

As shown in Fig. 1 and Fig. 2 and Fig. 3 and Fig. 4 and Fig. 5, this cellular phone signal shielding device includes the internal housing for cavity, institute Stating in housing has receiving module, sending module, clock module, CPU control modules, storage forwarding module and power module, on Clock module is stated to be used to provide the required clock of work, above-mentioned reception mould to receiving module, sending module, storage forwarding module Block is used to receive each mobile communication frequency range circulation of existing net and is converted into digital signal, and above-mentioned storage forwarding module is used In being filtered the data of digital signal and handling its storage, above-mentioned storage forwarding module will under the action of clock module Digital signal is retransmited to sending module after storing to setting time, and above-mentioned sending module is used for the digital signal after keeping in and passes through Be modulated to radio frequency after crossing digital-to-analogue conversion and send, above-mentioned sending module with some sendaisles and each sendaisle with pair The signal band answered, above-mentioned CPU control modules are used for the configuration for controlling sendaisle in sending module.

The receiving module include be connected in turn reception antenna, six select a RF switch, dielectric filter, Low-noise amplifier, rf gain adjuster, frequency mixer and analog-digital converter.

Reception antenna receives the downlink signal now netted, and selects a RF switch to be switched to different frequencies by the six of FPGA controls Existing net (is divided into six frequency ranges, be respectively 800,900,1800,2100,2300,2600) by section, by taking GSM passages as an example, works as needs When receiving now net GSM signals, six select a RF switch to be switched to GSM passages.

Since existing net signal is more complicated, so the Channel front end in GSM has dielectric filter, the band of GSM passages is filtered out External signal, is amplified by low-noise amplifier LNA and two stage gains of amplifier GAIN, then by level-one band-pass filter, The GSM of reception is allowed to show the signal-to-noise ratio that net signal possesses higher, the signal being filtered enters rf gain adjuster (radio frequency VGA), A RF switch is selected to be sent into the frequency mixer of common port by six again, the function of frequency mixer is to be transformed to radio frequency rf signal to be adapted to A/ D sampling intermediate-freuqncy signal, by A D conversion chips be changed into digital signal after give FPGA.This is one and receives the complete of GSM signals Journey is had suffered, is handled for remaining 5 class signal also by same mode, FPGA can control six according to the demand of digital processing Select a switching value.Analog-digital converter is used to above-mentioned signal being converted to digital signal.

The sending module includes digital analog converter, modulator, fader, gain-adjusted amplifier, power amplifier, double Work device and transmission antenna.

A total of six sendaisles of sending module, correspond to six class signal bands respectively.The hardware knot of six road sendaisles Structure is all consistent.

By taking one of passage as an example, FPGA first by the signal of digital processing be sent to D A chips (i.e. digital-to-analogue turn Parallel operation), it is transformed into analog signal output, gives modulator, the analog signal that the analog-signal transitions of intermediate frequency are radio frequency is passed through After fader (radio frequency VGA), due to by A after D conversions and modulation signal can produce it is many spuious, so in gain tune Need to be filtered after section amplifier, the band stray for sending signal is filtered out, to ensure signal-to-noise ratio.Filtered signal is through work( Put and send low level signal amplification for big signal, in order to reduce the quantity of transmission antenna, six sendaisles are passed through into a combining Transmission antenna is given after device (POI) (i.e. duplexer) combining.

The quantity of the sendaisle is six.

The clock module includes clock reference crystal oscillator, phase-locked loop chip, GPS chip and VCXO chips.

The major function of clock module is to provide sampling clock to modules such as analog-to-digital conversion, digital-to-analogue conversion, FPGA etc..

Specifically, these parts constitute the phase-locked loop circuit of a standard, use clock for producing AD, DA is adopted The work clocks such as sample clock, frequency mixer reference clock, modulator reference clock, FPGA work clocks.

The storage forwarding module includes SDRAM storage chips and baseband processing chip.

FPGA (i.e. SDRAM storage chips) and DDR3 (i.e. baseband processing chip) two parts, FPGA is by connecing after digitlization A number storage of collecting mail is read again to DDR3 after for a period of time, is then passed to corresponding sendaisle.

The downlink mobile phone signal for receiving different frequency range is circulated with receiving channel all the way, is stored in baseband processing module After be forwarded to six road sendaisles, the mobile phone shielding signal of above-mentioned forwarding is more than original signal.So as to reach the Mobile phone screen of forwarding Cover the purpose that signal can be achieved effectively to shield more than original signal.

Claims

1. a kind of cellular phone signal shielding device, including the internal housing for cavity, it is characterised in that have in the housing and receive mould Block, sending module, clock module, CPU control modules, storage forwarding module and power module, above-mentioned clock module is for being connect Receive module, sending module, storage forwarding module and the required clock of work is provided, above-mentioned receiving module is used for each of existing net The circulation of mobile communication frequency range receives and is converted into digital signal, and above-mentioned storage forwarding module is used for the data of digital signal It is filtered and handles its storage, above-mentioned storage forwarding module stores digital signal to setting under the action of clock module Retransmited after time to sending module, above-mentioned sending module is used for the digital signal after keeping in and is modulated to after digital-to-analogue conversion Radio frequency is simultaneously sent, and above-mentioned sending module is with some sendaisles and each sendaisle is with corresponding signal band, above-mentioned CPU control modules are used for the configuration for controlling sendaisle in sending module.

2. cellular phone signal shielding device according to claim 1, it is characterised in that the receiving module includes being sequentially connected Reception antenna together, six select a RF switch, dielectric filter, low-noise amplifier, rf gain adjuster, frequency mixer And analog-digital converter.

3. cellular phone signal shielding device according to claim 1, it is characterised in that the sending module digital analog converter, Modulator, fader, gain-adjusted amplifier, power amplifier, duplexer and transmission antenna.

4. cellular phone signal shielding device according to claim 1, it is characterised in that the quantity of the sendaisle is six.

5. cellular phone signal shielding device according to claim 1, it is characterised in that it is brilliant that the clock module includes clock reference Shake, phase-locked loop chip, GPS chip and VCXO chips.

6. cellular phone signal shielding device according to claim 1, it is characterised in that the storage forwarding module includes SDRAM Storage chip and baseband processing chip.

7. cellular phone signal shielding device according to claim 1, it is characterised in that received not with the circulation of receiving channel all the way With the downlink mobile phone signal of frequency range, six road sendaisles, the hand of above-mentioned forwarding are forwarded to after baseband processing module is stored Machine shielded signal is more than original signal.