Tri-Band RF Jamming System Team: Sadeq AlKhalifah – Mohammad AL-Khulaif – Ali Al-Turaifi Advisor: Dr. Oualid Hammi Objectives Design Methodology Noise Generator One of the splitter outputs represents the noise signal that is ready for transmission in the 900 MHz band. The designed RF jammer consists of mainly two parts: a Noise generator is based on the noise generated by the The remaining two signals are modulated to their low frequency noise generator, and an RF front end. Zener breakdown phenomenon. The circuit of the noise targeted carrier frequencies (1.8 GHz and 2.4 GHz). The noise source generates a low frequency random generator where the zener diode is reversely connected The three RF signals are then combined and fed to the which noise. In the RF front end part, the noise signal is to 14V-DC source from one terminal and the other antenna for transmitting. can jam RF communication signals transmitted by amplified and up-converted to each of the three terminal is connected to a 100 kΩ resistor and a 720 pF base stations in the 900MHz, 1800MHz and frequency bands which they 900MHz, 1800MHz and 2.4 capacitor where the output is taken from. After 2400MHz frequency bands as three frequency GHz. The three noise signals centered in the middle of constructing the noise circuit and measuring its spectrum The tests and power measurements were done using using a spectrum analyzer, it was found that it has a a bandwidth of almost 60MHz centered at approximately Analyzer N901A) . These measurements were taken at 50MHz with a power of -75dBm. four stages: before and after the amplification stage, Defining the RF jamming system and showing the importance and need of using it in many places. Giving a complete RF jamming system design based on commercial of the shelf circuit bands used in Saudi Arabia for mobile & wireless. Implementation and testing the design by the targeted frequency bands are then combined and sent through a multi-band antenna. using : Testing computerized spectrum analyzer (EXA Signal and right after each up-converting stages. Then, the - Advanced Design System Software ADS. readings have been compared to the estimated ones - Available components (hardware). by the ADS. Finally, the project has successfully If time permits, improving the project to satisfy low jammed the three targeted bands. cost and low power consumption. Introduction Radio frequency (RF) Jamming System ADS Simulation refer to a set of radio frequency equipments that RF Front-End produce a RF signal to disturb a targeted communication In this stage four amplifiers of the Two types of ZFL- established. This can be applied for instance for 1000LN+ and the ZX60-3018G+ were used, each has a cell The Tri-Band RF Jamming System that can jam RF gain of 23 dB and 22 dB respectively which result in a Jamming results in blocking the signal from the GSM signals at 900 MHz and 1800 MHZ, and Wi-Fi gain of around 90 dB in low frequency. signal at frequency 2.4 GHz can be designed based on receiver point view that would be no service to Frequency up-conversion commercial of-the-shelf components.. This system can The up-converting was done in two stages. In the first be achieved by building a noise generator produces stage, the amplified noise signal obtained at the output noise with low frequency and a known power level. of the amplification stage is modulated to the center Then to amplify this noise to an amount of power frequency of 920MHz. In the second stage, takes the more than the power of the aimed signals and up- amplified and modulated noise generated at the output converted to their frequency and transmitted using an of the first up-conversion stage is fed into a 3-way antenna. or prevent other it wireless from Conclusion being phone and Amplification stage: applications. cell phone and wireless networks within the effective radius of the jammer. Cell phones work by communicating with a service network through the utilization of cellular towers or base stations. In Saudi Arabia, wireless communication providers use the 900 MHz and 1800 MHz frequency bands for mobile communications, where as (Wi-Fi) signals are in the 2400MHz frequency band. These three bans are the targeted ones. Advanced Design System (ADS) is the used software in this project. The simulation schematic is presented for the 900 MHz, and for the two band which are 1800MHz and 2.4GHz. The noise source was replaced by a single-tone (continuous wave) generator providing a signal at the center frequency of the noise splitter. Future Work source’s output signal and with the same power level The design should be improved by adding more (-75 dBm). The various components of the front-end applicable amplifiers to reach a higher power levels (such as amplifiers, mixers, combiners, etc…) were that enables the system to increase its coverage area, simulated using their parameters available in the because the further the noise signal from the antenna datasheet. the weaker it became due to the high loss of air.