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A Term Paper
On
CELL PHONE JAMMER
Submitted by:
Sameer Gupta B.Tech (E&C), III Semester
Under the Guidance of
Ms. Sally Goyal
Amity School of Engineering
AMITY UNIVERSITY RAJASTHAN
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CERTIFICATE
This is to certify that the Report entitled Cell Phone jammer
submitted by Sameer Gupta with Enrolment No.A20405110036
on October 2011 is his own work and has been carried out under
my supervision. It is recommended that the candidate may now
be evaluated for his work by the University.
(STUDENT) (GUIDE) Signature: Signature:
Designation:
Date:
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ACKNOWLEDGEMENT
The completion of any task is not only the reward to the persons actively
involved in accomplishing it, but also the people involved in inspiring,
guiding and helping those people.
I take opportunity here to thank all those who have helped me in the completion of
this seminar, without whom the seminar indeed would have been, quite a difficult
task.
I would like to express my deepest gratitude to my Mentor,
Ms. Sally Goyal for his able guidance during the course of preparation of this
seminar.
B.Tech.
Second Year
Electronics and communication Engg.
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------------Index------------
1. Abstract-----------------------------------------------------5
2. History------------------------------------------------------6
3. Introduction to cell phone jammer---------------------8
4. Cell phone jamming basics------------------------------8
5. Cell phone jammer device-------------------------------8
6. Design Parameters----------------------------------------9
7. Component cell phone jammer-------------------------11
7.1 Power supply--------------------------------------11
7.2 Circuitry--------------------------------------------12
7.3 Antenna---------------------------------------------12
8. How cell phone jammer work---------------------------12
9. jamming techniques---------------------------------------13
10. Types of cell phone jammer device---------------------14
11. Cell phone jammer applications-------------------------19
12. Cell phone jammer legal issues--------------------------20
13. Alternatives to cell phone jamming---------------------21
14. Conclusion--------------------------------------------------22
15. Bibliography------------------------------------------------23
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1. Abstract
The last few years have witnessed a dramatic boom in the wireless communications industry,
hence increasing the number of users of mobile communication devices. This magnified the need
for a more efficient and reliable signal scrambler. This paper deals with the Mobile Jamming
Technology. The concept of jamming technology is studied in a step-by-step approach. The
mobile jammer in the frequency range of 890MHz to 960MHz (GSM) is developed. Its circuit
analysis simulation is performed using Speace-spice Software. Antenna simulation is done by
using IE3D software [8]. The jammer circuit is designed with minimum cost and high efficiency.
The jammer jams the signal within five meter effective radius. Index terms Antenna, Jammer,
Wide band frequency.
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2. History
The rapid proliferation of cell phones at the beginning of 21st century to near ubiquitous status
eventually raised problems such as their potential use of invade privacy or contribute to rampant
and egregious academic cheating. In addition public black lash privacy or contribute to rampant
The rapid proliferation of cell phones at the beginning of the 21st century to near
ubiquitous status eventually raised problems such as their potential use to invade privacy or
contribute to rampant and egregious academic cheating. In addition public backlash was growing
against the intrusive disruption cell phones introduced in daily life. While older analog cell
phones often suffered from chronically poor reception and could even be disconnected by simple
interference such as high frequency noise, increasingly sophisticated digital phones have led to
more elaborate counters. Cell phone jamming devices are an alternative to more expensive
measures against cell phones, such as Faraday cages, which are mostly suitable as built in
protection for structures. They were originally developed for law enforcement and the military to
interrupt communications by criminals and terrorists. Some were also designed to foil the use of
certain remotely detonated explosives. The civilian applications were apparent, so over time
many companies originally contracted to design jammers for government use switched over to
sell these devices to private entities. Since then, there has been a slow but steady increase in their
purchase and use, especially in major metropolitan areas.
http://en.wikipedia.org/wiki/Faraday_cage
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Cell phone jammer
Device
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3. Introduction to cell phone jammer
Cell phones are everywhere these days. According to the Cellular Telecommunications
and Internet Association, almost 195 million people in the United States had cell-phone service
in October 2005. And cell phones are even more ubiquitous in Europe.
It's great to be able to call anyone at anytime. Unfortunately, restaurants, movie theaters,
concerts, shopping malls and churches all suffer from the spread of cell phones because not all
cell-phone users know when to stop talking. Who hasn't seethed through one side of a
conversation about an incredibly personal situation as the talker shares intimate details with his
friend as well as everyone else in the area?
While most of us just grumble and move on, some people are actually going to extremes
to retaliate. Cell phones are basically handheld two-way radios. And like any radio, the signal
can be disrupted, or jammed.
4. Cell Phone Jamming Basics
Disrupting a cell phone is the same as jamming any other type of radio communication.
A cell phone works by communicating with the service network through a cell toweras base
station. Cell towers divide a city into small areas,or cells. As a cell phone user drives down the
street, the signal is handed from tower to tower. Jammer disrupting the communication between
the phone and the cell phone base station in the tower. Its called denial-of-service attack.
The jammer denies service of the radio spectrum to the cell phone users within range of
the jamming device as shown in figure bellow.
5. Cell Phone Jamming Device
Jamming devices overpower the cell phone by transmitting a signal on the same
frequency and at a high enough power that the two signals collide and cancel each other out.
http://www.ctia.org/http://www.ctia.org/
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Cell phones are designed to add power if they experience low-level interference, so the
jammer must recognize and match the power increase from the phone.
Cell phones are full-duplex devices, which means they use two separate frequencies, one
for talking and one for listening simultaneously. Some jammers block only one of the
frequencies used by cell phones, which has the effect of blocking both. The phone is tricked into
thinking there is no service because it can receive only one of the frequencies.
Less complex devices block only one group of frequencies, while sophisticated jammers
can block several types of networks at once to head off dual-mode or tri-mode phones that
automatically switch among different network types to find an open signal. Some of the high-end
devices block all frequencies at once, and others can be tuned to specific frequencies.
To jam a cell phone, all you need is a device that broadcasts on the correct frequencies.
Although different cellular systems process signals differently, all cell-phone networks use radio
signals that can be interrupted. GSM, used in digital cellular and PCS-based systems, operates in
the 900-MHz and 1800-MHz bands in Europe and Asia and in the 1900-MHz (sometimes
referred to as 1.9-GHz) band in the United States. Jammers can broadcast on any frequency and
are effective against AMPS, CDMA, TDMA, GSM, PCS, DCS, iDEN and Nextel systems. Old-
fashioned analog cell phones and today's digital devices are equally susceptible to jamming.
The actual range of the jammer depends on its power and the local environment, which
may include hills or walls o
