Texas Instruments TIRIS SCBU025 Reference Manual Download | Manualshive

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Antenna

Reference Guide

November 1996

SCBU025

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Summary of Contents for TIRIS SCBU025

Page 1: ...Antenna Reference Guide November 1996 SCBU025...

Page 2: ...Antenna Reference Guide Literature Number SCBU025 November 1996...

Page 3: ...nna Voltage and Field Strength 21 4 1 Maximum Antenna Voltage Allowed 21 4 2 Maximum Magnetic Field Strength That Can Be Generated 22 4 3 Magnetic Field Strength Boundaries for Countries With RMS Regu...

Page 4: ...8 3 2 Readout Range Vantenna 19 5 1 Maximum Transponder Speed 23 6 1 Antenna Dimensions 28 6 2 Antenna Connector 29 6 3 Mounting a Gate Antenna 29 6 4 Mounting a Stick Antenna 29 A 1 Magnetic Field Di...

Page 5: ...ollowing antennas RI ANT G01C RI ANT G02C RI ANT G03C RI ANT S01C If You Need Assistance Application Centers are located in Europe North and South America the Far East and Australia to provide direct...

Page 6: ...www ti com 6 SCBU025 November 1996 Submit Documentation Feedback...

Page 7: ...elect the best antenna for a specific applications to install it correctly and to optimize its performance Although the main focus is on TIRIS standard antennas the guide also contains some theoretica...

Page 8: ...Voltage and Field Strength A description of the allowed antenna voltages and how to calculate other antenna voltages and what field strengths are generated Chapter 5 Speed Applications A description...

Page 9: ...minimum voltage of 5 V on its capacitor Because the charge up takes place in a fixed time the magnetic field strength of the charging signal is relevant to the maximum readout range see Appendix A Th...

Page 10: ...and a charge up diagram are the same and are independent of noise A readout diagram includes the effects of noise Each antenna has its own specific Isofield pattern The field strength decreases expone...

Page 11: ...sion for higher antenna voltages to be used 2 These voltages cannot be achieved using the RF Module RI RFM 001 It should be possible to achieve these levels if you use the RF Module RI RFM 002 which a...

Page 12: ...igure 2 6A 107 V falls just above the first inner line which represents 100 V 3 Using a ruler line up the 107 V spot with the side axis This shows you that you have a charge up distance of just under...

Page 13: ...on How to Use the Charge Up Diagrams Figure 2 6 Charge Up Diagram for the G02C Antenna Antenna Voltage From 100 V to 730 V in 90 V Steps Peak to Peak Scale in Meters SCBU025 November 1996 How the Syst...

Page 14: ...on How to Use the Charge Up Diagrams Figure 2 7 Charge Up Diagram for the G03C Antenna Antenna Voltage From 20 V to 391 V in 53 V Steps Peak to Peak Scale in Meters 14 How the System Works SCBU025 Nov...

Page 15: ...ation B 90 Orientation How to Use the Charge Up Diagrams Figure 2 8 Charge Up Diagram for the S01C Antenna 361 V 393 V and 650 V Scale in Meters SCBU025 November 1996 How the System Works 15 Submit Do...

Page 16: ...ransponders in order for them to be successfully read The smaller the antenna the smaller the major lobe The smaller the antenna the greater the selectivity The following list shows the TIRIS antennas...

Page 17: ...urces like monitors auto engines other transponders within the field of the antenna switching relays etc close to the readout antenna The readout range can be increased by orientating the readout ante...

Page 18: ...80 V Noise limiting boundary the reading distance over which a proper readout can be achieved taking noise into consideration in Figure 3 2 for the G03C antenna this is between 180 and 950 Vant Vcl 7...

Page 19: ...eadout Range Figure 3 2 gives an indication of the readout range for the standard antennas depending on the antenna voltage Figure 3 2 Readout Range Vantenna SCBU025 November 1996 Noise Characteristic...

Page 20: ...www ti com Noise Characteristics 20 SCBU025 November 1996 Submit Documentation Feedback...

Page 21: ...se allowed is 15 C and for the stick antenna 75 C The maximum temperature rise defines the allowed maximum RMS current for each antenna These currents are Ieff G01C 10 6 A G02C 8 25 A G03C 12 0 A S01C...

Page 22: ...ferent antenna voltage very easily You just divide the antenna voltage by 1000 and multiply the result with the value in Table 4 1 The values above are valid for antenna inductance of 27 H because the...

Page 23: ...is subject to no magnetic field for a short time during this short time if the transponder has built up enough energy it starts to transmit its ID code That transmission may not be completed Then it e...

Page 24: ...ys be lower than that calculated with Equation 4 1 There are two constraints 1 Vcl 5 V 2 Hrms constant Constraint 1 For TX 50 ms Vcl 5 A 1 eTX RxC where R 302777 C 120 nF A 6 689 For TX TXb Where b ti...

Page 25: ...5 ms 1 547 3 5 10 ms 1 862 3 5 ms 2 6 2 24 Example Using Antenna G01C in France The antenna voltage for 50 ms allowed is 688 If TX 90 ms then 688 0 91 626 Vant For short TX pulses and antenna voltage...

Page 26: ...www ti com Speed Applications Detecting Moving Transponders 26 SCBU025 November 1996 Submit Documentation Feedback...

Page 27: ...o the antenna Metal parts larger than the size of your hand disturb the field pattern and cause lower readout range The connection leads can withstand a pull force of 100 newton 22 5 lb in any directi...

Page 28: ...ength of the connecting lead or replacing the connectors affects the inductance and quality factor This can decrease the performance of the system The Figure 6 2 shows the dimensions of the connector...

Page 29: ...i com Connection Leads Figure 6 2 Antenna Connector Figure 6 3 Mounting a Gate Antenna Figure 6 4 Mounting a Stick Antenna SCBU025 November 1996 Mechanical Characteristics 29 Submit Documentation Feed...

Page 30: ...www ti com Mechanical Characteristics 30 SCBU025 November 1996 Submit Documentation Feedback...

Page 31: ...ormation or detail please contact your local TIRIS Application Center When electric current flows through a conductor a circular magnetic field develops around the conductor with its radius perpendicu...

Page 32: ...e conductors are shaped into a coil form called an inductor see Figure A 4 the magnetic field lines are distributed as illustrated Figure A 3 Magnetic Field Distribution Around a Two Parallel Conducto...

Page 33: ...III because the field is spreading out when moving away from the transmitter The field gets less dense Inductor IV shows what happens if the receiver inductor is perpendicular to the transmitter whil...

Page 34: ...www ti com Theory of Coupled Inductors 34 SCBU025 November 1996 Submit Documentation Feedback...

Page 35: ...na the voltage on the readout antenna and the charge up time charge up time TX The time that the readout antenna is transmitting an energizing signal to the transponder CISPR A method of measuring fie...

Page 36: ...readout speed Some utilizations of the system require that a moving transponder be read The speed at which the transponder can be moving and still be read is the readout speed receive time RX The time...

Page 37: ...degrees to the antenna For Ferrite rod transponder in line with the antenna 90 For Gate antenna transponder parallel to the antenna For Ferrite rod transponder at an angle of 90 degrees to the antenna...

Page 38: ...m TI to use such products or services or a warranty or endorsement thereof Use of such information may require a license from a third party under the patents or other intellectual property of the thir...

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