Cellular Device Detection Instructor : Yossi Hipsh Performed by: Smadar Katan Gal Mendelson Project Number: D0517 Winter 2007/8 Semesterial Project Midterm Presentation

General specifications Room size : 4mX6m. The tables are 0.7m high. 2 Multi-beam antenna at each side of the room for full coverage.

The Room θ room

General specifications (Continue…) So far there was a solution for one cellular device in the room. Our project deals with two cellular devices in the room The devices are far enough from one another that they will be received in two different pairs of beams.

General specifications (Continue…) Transmission FrequencyCompany MHz MHz MHz MHz Partner MHz MHz MHz MHz Cellcom MHz MHz MHz MHz Pelephone

General specifications (Continue…) Transmission FrequencyCompany MHz MHz MHz MHz Partner MHz MHz MHz MHz Cellcom MHz MHz MHz MHz Pelephone

General specifications (Continue…)- power of Mobile Station GSM 1800GSM 900Mobile Class 30 dbm = 1 Watt1 24 dbm = 0.25 Watt2 36 dbm = 4 Watt3 4 5 Since we are dealing with Cellcom for now we will focus on GSM: Mobile stations can come in different power classes, which define the maximum RF power level that the unit can transmit. For GSM-900 there are five powers classes, for GSM-1800 there are three power classes.

Solution suggestion Our Part

Antenna frequency : Wave length: Definitions and Sizes 4 Dipole Antenna Array: (the sizes are from measurement) d=43cm 57/8 cm 3.8cm 7.8cm

Definitions and Sizes (continue…) The angles are: Where

Beams’ angles

Calculations (continue…) In order to maintain symmetry we will place the antenna as following: Geometry

BFN

The Beams To manufacture beams that point to different directions we need to change the length of the micro strip lines in the following way:

The Beams (continue…) Let’s observe two dipoles We see that L=11.6 cm

The Beams (continue…) Now we can determine:

Computing

Location Drawing 10 Calculation of rotation angle of the antenna : From the "Law of cosine":

Location

Location (continue…)

Time Schedule - Design and manufacture BFN for two beams which includes - BFN for θ angle (manufacturing 2) - Power combiner network 2:1 (manufacturing 8) - Integrating Developing the Simulator Final report and presentation