This document discusses cell phone jammers. It begins with an introduction that explains cell phone jammers create temporary dead zones for cell phone signals. It then describes how jammers work by transmitting frequencies that disrupt communication between phones and towers. The document outlines different types of jamming techniques and provides block diagrams of jammer components. It discusses applications of jammers and the future scope of jamming technology. In conclusion, it states that while jammers can be useful, how the technology is used is important.

1. Cell Phone Jammer
By
Sameer gupta
B.TECH (ECE)
2010 to 2014
Department of Electronics & Communication Engineering
Amity university rajasthan
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2. Contents
• Introduction
• How Cell Phone Jammer Works
• Types of Jamming techniques
• Design Parameters/ Specification Types of jammer
device
• Block Diagram
• Types Of Jammer Device
• Applications of Jammer
• Future scope of Jamming Technology
• Conclusion
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3. Introduction
Cell phone jammers are devices that create a
temporary "dead zone" to all cell phone
traffic in their immediate proximity
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4. How cell phone jammer works
A jamming device transmits - same radio frequencies of
greater power as the cell phone, disrupting the
communication between the phone and the cell-phone
base station in the tower. It's a called a denial-of-service
attack.
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5. • This causes interference with communication of cell
phones and towers to render the phones
unusable. On most phones, the network would be
out of range.
• So Jammers work by either disrupting phone to
tower freq.. or tower to phone frequencies.
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6. Jamming techniques
• Type "A" Device: JAMMERS
• Type “B” Device: INTELLIGENT CELLULAR DISABLERS
• Type “C” Device: INTELLIGENT BEACON DISABLERS
• Type “D” Device: DIRECT RECEIVE & TRANSMIT JAMMERS
• Type “E” Device: EMI SHIELD - PASSIVE JAMMING
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7. Jamming techniques
1. Type "A" Device: JAMMERS
This type of device comes equipped with several
independent oscillators transmitting ’jamming
signals’ capable of blocking frequencies used by
paging devices as well as those used by cellular
systems control channels for call establishment.
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8. Jamming techniques
2.Type “B” Device: INTELLIGENT CELLULAR DISABLERS
Unlike jammers, Type ”B” devices do not
transmit an interfering signal on the control
channels. The device, when located in a
designated ’quite’ area, functions as a
’detector’. It has a unique identification
number for communicating with the cellular
base station.
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9. Jamming techniques
3. Type “C” Device (Intelligent Beacon Disablers)
Unlike jammers, Type C devices do not transmit an interfering
signal on the control channels. The device, when located in a
designated ’quiet’ area, functions as a ’beacon’ and any
compatible terminal is instructed to disable its ringer or
disable its operation, while within the coverage area of
beacon.
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10. Jamming techniques
4. Type “D” Device (Direct Receive & Transmit Jammers)
This jammer behaves like a small, independent and portable
base station, which can directly interact intelligently or
unintelligently with the operation of the local mobile phone.
The jammer is predominantly in receive mode and will
intelligently choose to interact and block the cell Phone
directly if it is within close proximity of the jammer.
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11. Jamming techniques
5. Type E Device (EMI Shield - Passive Jamming)
This technique is using EMI suppression techniques to make a room
into what is called Faraday cage. Although labor intensive to
construct, the Faraday cage essentially Blocks or greatly attenuates,
virtually all electromagnetic radiation from entering or leaving the
cage - or in this case a target room.
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12. Design Parameters/ Specification
The frequency bands
Distance to be jammed (D)
Free space loss {F}= Path Loss (dB)= 32.44 + 20 log D(km) + 20log f(MHz)
Power calculations
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13. Block Diagram
Jamming
Power supply If section Rf section
signals
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14. Power supply
Transformer
Rectifier filter Regulator
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15. IF section
Triangular wave
Mixer summer
generator Noise generator
“Summer”
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16. IF section

17. RF section
Voltage
Controlled Power Amplifier Antenna
Oscillator
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18. RF section

19. Contd.
Cell Phone Jammer
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20. Types of jammer device
Types of cell phone jammer device
There are many types of cell phone jammer device which is used in
our daily life .as we take a example of class room ,where we does not
want to use of cell phone than there we can use cell phone jammer
device .by this we can produce the interface between the cell phone
base station and cell phone . resulting it disconnect the cell from base
station .and we can not receive the any calls from base station.
For this there are many types of cell phone jammer devices which is
given as below:
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21. • Remote Control cell phone jammer
• Adjustable cell phone Jammer
• School &Prison Phone Jammer
• Explosion – Proof cell phone jammer
• Police & Mila try Phone Jammer
• Portable Cell Phone Jammer
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23. Application
• To maintain the complete silence in library and
lecture hall
• To avoid fraud in examination hall
• To avoid disturbance in class room
• For providing security in business conference,
board of directors rooms, seminars, etc.,
• For providing calm and peaceful atmosphere in
Hospitals
• Church/Mosques/Cathedral/Temple/Religious
establishment
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24. Future scope of Jamming Technology
• While the law clearly prohibits using a device to
actively disrupt a cell-phone signal, there are no rules
against passive cell-phone blocking.
• Companies are working on devices that control a cell
phone but do not "jam the signal.
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25. Conclusion
• Every technology has good aspect as well as bad aspect
the important thing is ,how we are using it.
• Cell phone jammers are very useful to the society from
the anti-social elements. We can save our national
leaders. we can restrict the communication network
between the anti-social elements by using the cell phone
jammers. Cell phone jammers prevent the students from
carrying cell phones to the colleges. As every thing goes
fine, it is very necessary to implement in all the colleges
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26. Bibliography
• en.wikipedia.org/wiki/Mobile_phone_jammer
• Multitopic Conference, 2008.INMIC 2008.IEEE
International
• www.HowStuffWork.com/
• Ahmed Jisrawi, "GSM 900 Mobile Jammer", undergrad
project, JUST, 2006.
• Sami Azzam, Ahmad Hijazi, Ali Mahmoudy. ”Smart
Jammer for mobile phone systems”
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27. Contd.
Bibliography
• Mobile & Personal Communications Committee of
• the Radio Advisory Board of Canada, “Use of
• jammer and disabler Devices for blocking PCS,
• Cellular & Related Services”
• "Zone of silence [cell phone jammer]," Spectrum,
IEEE , vol.42, no.5,
18, May 2005
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28. THANK YOU
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