1. Midterm presentation Midterm presentation Cellular Device Detection Instructor : Yossi Hipsh Performed by: Ari Avitzur Asher Pilai Winter 2008/9 Semesterial Project

2. Inputs – general specifications Room size : 4.6mX2m. 2 Multi-beam antenna at each side of the room for full coverage. The antennas and the cell-phone are placed on shelf in the room The antenna-shelf are 2m high. The cell-phone-shelf is 1.73m high.

3. Antenna AAntenna B 4.6m 2m The room description

4. System description Cellphone Antenna A detectorAmp Computing & Display Unit Amp detector Antenna B ADC

5. Power consideration We use the equation : Pt = 0.1 Watt, Gt = 0dB = 1 R = 2.41m = (wave length) = 0.17m Gr is the gain of the antenna witch is a function of angle Θ.

6. Detection theory The value of as function of X dimension is:

7. Detection theory(continue) To describe as a function of the angle Θ, we use Forier Transform: In order to describe power as function of Θ, we use.

8. Detection theory(continue) Where:

9. Detection theory(continue) The antenna is designed that each beam’s maximum match the other beam’s -9dB point. We need to determine in order to get the right graph.

10. Antenna frequency : Wave length: Definitions and Sizes 4 Dipole Antenna Array: (the sizes are from measurement) D’=35.2cm D=43.7 cm 11.7m 4.25cm

11. Why do we use 2 antennas? In case the shelf is a line (one-dimension), one MBA is enough to determine the exact location. The MBA gives us a-plane, and the meeting of a-plane & a line is a point. is the deviation of the beam from the center.

12. Why do we use 2 antennas? The shelf is Two- dimension, therefore we need two MBA’s, that each one of them gives us a-plane, and the meeting of the two planes & the shelf’s plane gives us the point.

13. Determine ∆Ѳ To manufacture beams that point to different directions we need to change the length of the micro strip lines in the following way:

14. Determine ∆Ѳ(continue…) Let’s observe the first and last dipoles We see that

15. Measurements (done) Amplifier – we have characterized the behavior in a “Output Voltage Vs. Input voltage” graph:

16. Measurements (to be done) Detector – we will characterize it by an Output Vs. Input voltage, similar to the amplifier. Antennas – we will characterize it by an Output voltage Vs. angle from antenna ( ). we will make sure it feet the theory “Sinc” graph, and make adjustments if necessary.

17. Schedule Measure the Power Detectors and new Antennas – 12-3-2009 – 26-3-2009 Build the detecting system – 26-3-2009 – 2-4-2009 Run a simulation 2-4-2009 – 16-4-2009 Present the final presentation and complete the final report ~30-4-2009