CA2782932A1 - Mobile phone shielding device - Google Patents
Mobile phone shielding device Download PDFInfo
- Publication number
- CA2782932A1 CA2782932A1 CA 2782932 CA2782932A CA2782932A1 CA 2782932 A1 CA2782932 A1 CA 2782932A1 CA 2782932 CA2782932 CA 2782932 CA 2782932 A CA2782932 A CA 2782932A CA 2782932 A1 CA2782932 A1 CA 2782932A1
- Authority
- CA
- Canada
- Prior art keywords
- mobile phone
- shielding device
- phone shielding
- local oscillator
- unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000001514 detection method Methods 0.000 claims 1
- 238000010295 mobile communication Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- VJYFKVYYMZPMAB-UHFFFAOYSA-N ethoprophos Chemical compound CCCSP(=O)(OCC)SCCC VJYFKVYYMZPMAB-UHFFFAOYSA-N 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
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- Noise Elimination (AREA)
Abstract
The present invention relates to a mobile phone shielding device, which comprises a local oscillator signal generating circuit, a mixer, a low-noise amplifier, and an antenna connected in this order. The local oscillator signal generating circuit includes a signal detecting unit, a frequency phase-locked unit, a band pass filter unit and a voltage-controlled unit connected in this order.
The mobile phone shielding device of the present invention only interferes with the downlink signal in several frequency bands while not affecting the uplink signal in the mobile communication. The present invention is advantageous in that it can interfere with several bands simultaneously by one device and is electromagnetic environment friendly.
The mobile phone shielding device of the present invention only interferes with the downlink signal in several frequency bands while not affecting the uplink signal in the mobile communication. The present invention is advantageous in that it can interfere with several bands simultaneously by one device and is electromagnetic environment friendly.
Description
MOBILE PHONE SHIELDING DEVICE
TITLE OF THE INVENTION
[0001] Mobile Phone Shielding Device CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The present patent application claims the benefits of priority of Chinese Utility Model Application no. 201220307115.1, entitled "Mobile Phone Shielding Device" and filed at the China Patent Office on June 28, 2012.
FIELD OF THE INVENTION
TITLE OF THE INVENTION
[0001] Mobile Phone Shielding Device CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] The present patent application claims the benefits of priority of Chinese Utility Model Application no. 201220307115.1, entitled "Mobile Phone Shielding Device" and filed at the China Patent Office on June 28, 2012.
FIELD OF THE INVENTION
[0002] The present invention relates to interference and electronic countermeasures in communication field, particularly to a mobile phone shielding device.
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION
[0003] A mobile phone shielding device makes a mobile phone incapable of normally receiving signals sent from a base station and thus incapable of establishing connection with the base station by scanning from low frequency to high frequency of the forward channel so as to form random codes in and interfere with the message received by the mobile phone. The mobile phone will keep searching network, can not receive any signal or connect to any service - -system and so on. The mobile phone shielding device in the prior art achieves signal shielding effect mainly by using a scanning source or a noise source to modulate the frequency sweeping signals output from a VCO (voltage controlled oscillator) so as to produce covering signals in a certain frequency band which interfere with the downlink signals of the base station and render the mobile phone incapable of detecting the downlink signals. The mobile phone shielding device in the prior art suffers from the temperature characteristics of the VCO.
Specially, the preset frequency point of the VCO will vary with the temperature, which results an offset of the covering band output from the shielding device.
Therefore, the mobile phone shielding device in the prior art need to output a frequency band wider than the frequency band to be shielded, so that it still covers the band to be shielded even if temperature drift occurs in the VCO.
SUMMARY OF THE INVENTION
Specially, the preset frequency point of the VCO will vary with the temperature, which results an offset of the covering band output from the shielding device.
Therefore, the mobile phone shielding device in the prior art need to output a frequency band wider than the frequency band to be shielded, so that it still covers the band to be shielded even if temperature drift occurs in the VCO.
SUMMARY OF THE INVENTION
[0004] In order to overcome the deficiency of the prior art mentioned above, the present invention provides a mobile phone shielding device, which comprises a local oscillator signal generating circuit, a mixer, a low-noise amplifier, and an antenna connected in this order. The local oscillator signal generating circuit includes a signal detecting unit, a frequency phase-locked unit, a band pass filter unit and a voltage-controlled unit connected in this order.
[0005] The mobile phone shielding device of the present invention only interferes with the downlink signal in several frequency bands while not affecting the uplink signal in the mobile communication. The present invention is advantageous in that it can interfere with several bands simultaneously by one device and is electromagnetic environment friendly. Furthermore, the built-in antenna makes it possible to achieve PnP (Plug and Play) and avoid misoperation.
The built-in antenna can rotate from 0 to 360 degree and select a targeted shielding range.
BRIEF DESCRIPTION OF THE DRAWINGS
The built-in antenna can rotate from 0 to 360 degree and select a targeted shielding range.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] Fig. 1 is a diagram illustrating the structure of the mobile phone shielding device according to the present invention;
[0007] Fig. 2 is a diagram illustrating the structure of the local oscillator signal generating circuit.
DETAILED DESCRIPTION OF THE INVENTION
DETAILED DESCRIPTION OF THE INVENTION
[0008] As shown in Fig. 1 that is a diagram illustrating the structure of the mobile phone shielding device according to the present invention, the mobile phone shielding device comprises a local oscillator signal generating circuit, a mixer, a low-noise amplifier, and an antenna connected in this order. Fig. 2 is a diagram illustrating the structure of the local oscillator signal generating circuit.
The local oscillator signal generating circuit includes a signal detecting unit, a frequency phase-locked unit, a band pass filter unit and a voltage-controlled unit connected in this order.
The local oscillator signal generating circuit includes a signal detecting unit, a frequency phase-locked unit, a band pass filter unit and a voltage-controlled unit connected in this order.
[0009] The signal detecting unit detects and collects signals from a mobile phone through six channels and transmits the signals to the frequency phase-locked unit.
The voltage-controlled unit produces a local oscillator signal at a predetermined frequency provided by the frequency phase-locked unit under the control of the band pass filter unit. The local oscillator signal produced by the local oscillator signal generating circuit is transferred to the mixer and then amplified by the low noise amplifier. The amplified signal is transmitted by the antenna.
The voltage-controlled unit produces a local oscillator signal at a predetermined frequency provided by the frequency phase-locked unit under the control of the band pass filter unit. The local oscillator signal produced by the local oscillator signal generating circuit is transferred to the mixer and then amplified by the low noise amplifier. The amplified signal is transmitted by the antenna.
[0010] The mobile phone shielding device can select mobile phone signals in several frequency bands and only interferes with the downlink signal in several frequency bands. Therefore, it does not affect the uplink signals in the mobile communication and achieves the effect of interfering with several frequency bands simultaneously by one device.
[0011] While illustrative and presently preferred embodiments of the invention have been described in detail hereinabove, it is to be understood that the inventive concepts may be otherwise variously embodied and employed and that the appended claims are intended to be construed to include such variations except insofar as limited by the prior art.
Claims (2)
1. A mobile phone shielding device comprising a local oscillator signal generating circuit, a mixer, a low-noise amplifier, and an antenna connected in this order.
2. The mobile phone shielding device of claim 1, wherein the local oscillator signal generating circuit includes a signal detection unit, a frequency phase-locked unit, a band pass filter unit and a voltage-controlled unit connected in this order.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220307115.1 | 2012-06-28 | ||
| CN201220307115 | 2012-06-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2782932A1 true CA2782932A1 (en) | 2013-12-28 |
Family
ID=49775779
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2782932 Abandoned CA2782932A1 (en) | 2012-06-28 | 2012-07-09 | Mobile phone shielding device |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2782932A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103713540A (en) * | 2014-01-13 | 2014-04-09 | 泉州市华众电子科技有限公司 | Control device of mobile phone signal shielding device |
| CN105406936A (en) * | 2015-11-30 | 2016-03-16 | 惠州学院 | Mobile phone signal shielding instrument |
-
2012
- 2012-07-09 CA CA 2782932 patent/CA2782932A1/en not_active Abandoned
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103713540A (en) * | 2014-01-13 | 2014-04-09 | 泉州市华众电子科技有限公司 | Control device of mobile phone signal shielding device |
| CN103713540B (en) * | 2014-01-13 | 2016-08-17 | 泉州市华众电子科技有限公司 | A kind of control device of cellular phone signal shielding device |
| CN105406936A (en) * | 2015-11-30 | 2016-03-16 | 惠州学院 | Mobile phone signal shielding instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |
Effective date: 20150709 |