Presenters:

1. Final Presentation Presenters:

2. Projects Goal • To detect the presence of a working cellular device within a confined room. • To locate the cellular device within the confined space at a 0.5x0.5m accuracy.

3. Solution Steps • Build pre unit. • Build one full unit. • One system builds from three units. • Placed the systems is the room (four systems). • Connect the systems to a computer. • Assumptions: • There will be only one cellular device in the room, there will be no other RF in that room

4. General overview • We placed four systems with in the room (two on each side wall). • Each system consists of three basic units • Every unit is built of a dipole isotropy antenna, filters, gains, mixers, sum, energy detector.

5. Mixers Bank of Filters Gains sum Filter E.D Gains Basic Unit Basic Unit schema:

6. Antenna L.O 1.5Ghz -1db -1db H.Pass 1.7Ghz L.Pass 1.9Ghz 20db 20db Mixer -7db -1db L.Pass 400Mhz 26db 26db Energy Detector Pre Unit • In order to build the entire system we need to build a basic unit for a specific device.

7. Pre system • The pre system is the key to solve the problem. • We build the system wire up, therefore each component will be on "Print" ready for connection. • For testing purposes we use a VCO to simulate a cellular device. • The VCO and the mixer are the main components in the system therefore we designed them in separately.

8. -3db -3db GND GND 3-7 2,5,6,7 1 Vcc V.C.O POS-2000 LO 8 RFout Mixer SRA-220 2 8 V-Tune 1 3 IF RF VCO And Mixer Schema:

9. 8 6 4 2 POS-2000A 7 5 3 1 VCO Pin View:

10. VCO • Operating DC voltage at 8V. • To make sure that the power source is stable we used capacitors. • To protect the Mixer from returning signals we applied 3dB loss in its input, for that we designed a pie net resistors and placed it in the VCO output. • We need different values for Vtune so we use a 24V source with a potentiometer. • To view/test the frequency, as a result of Vtune we placed a test point. • To map the frequency output values Vs Vtune we conducted an experiment.

11. VCO Experiment • Motivation: • The experiment has two main purposes. • Check power and frequency in output/test point. • To examine the frequency output values Vs Vtune.

12. POWER 24V 8V Spectrum Analyzer Out Test 50 Ohm VCO-POS2000 VCO Experiment Schema:

13. VCO Experiment • Conclusions and recommendations: • VCO worked as expected. • There is difference in power output between the datasheet to the actual value. (result of wire and connector losses) • The difference between test pin to the output pin is -21dB. • When needed to know the output frequency you can measure Vtest with a spectrum analyzer. • If Vtest is not used, connection of a resistor of 50 ohm is preferred.

14. Mixer SRA-220 3 1 8 2,5,6,7 Mixer Schema:

15. Finishing steps for the basic unit • Prepare the filters and gains for wire up. • Build (schema in page 19) an energy detector and an antenna. • Connect all the devices and conduct an experiment when the VCO is simulating the cellular device. • Sum the results and conclusions.

16. L.O 1.5Ghz L.O 1.15Ghz -1dB -1dB -1dB -1dB H.Pass 1.7Ghz H.Pass 800Mhz L.Pass 1.9Ghz L.Pass 900Mhz 20dB 20dB 20dB 20dB Mixer Mixer -7dB -7dB -1dB L.Pass 400Mhz 26dB 26dB Energy Detector Antenna sum Full system schema: 3

17. Future plans • Build the test case described in the Basic Unit. • Test the partial design. • Create 1 directional antenna. • Test the complete circuit including a directional antenna and 3 basic units. • Build the system <-> CPU interface. • Test the system.