Tham khảo tài liệu 'radio frequency identification fundamentals and applications, design methods and solutions part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 142 Radio Frequency Identification Fundamentals and Applications Design Methods and Solutions Lets. E V1 - V1 E2 V 2 - V 2 E E - denote the components of a small disturbance from the fixed point. To see whether the disturbance grows or decays we need to derive differential equations for E 1 E2. Lets do the equation first. E V f1 V 1 Ỉ1 V 2 ệ2 f 1 V 1 V 2 E f E E f O E 2 E 2 EE E J J v 51 dV1 2 dV2 1-2 2-2 1 2 V. f 1 V 1 V 2 0. Fixed. po int. condition f 1 V2 f 2 V1 K1 V2 K2 dl1 0 f 1 ÕV1 ÕV2 Similarly we can write J2 V2 f 2 V1 E1 V 2 E2 f 2 V 1 V2 E f E f O E2 E2 EE EJ J v 51 3V1 2 2 dV2 1-2 2 -2 1 2 V. f 2 V 1 V 2 0. int. condition f 1 V 2 f 2 V1 K1 V 2 K 2 f K1 K 2 ỔV1 ỔV2 Hence the disturbance E E evolve according to E1E2 E1 l_ E2 J df 1 0V1 df 2 ỠỸĨ df 1 5V2 df 2 0V2 E1 E 2 _ Matrix A df 1 dV 1 df 1 dV 2 df 2 -ỔV1 df 2 d V 2 _I V 1 V 2 RFID TAGs Coil s Dimensional Parameters Optimization As Excitable Linear Bifurcation System 143 1 J df 1 ÕVĨ df 2 õVĩ df 1 dV2 df 2 dV2 1 s. J As we move from one dimensional to two dimensional systems still fixed points can be created or destroyed or destabilized as parameters are varied - in our system RFID global TAG parameters. We can describe the ways in which oscillations can be turned on or off. The exact meaning of bifurcation is if the phase portrait changes its topological structure as a parameter is varied we say that a bifurcation has occurred. Examples include changes in the number or stability of fixed points close orbits or saddle connections as a parameter is varied. 6. RFID TAG with losses as a dynamic system RFID TAG system is not an ideal and pure solution. There are some Losses which need to be under consideration. The RFID TAG losses can be represent first by the equivalent circuit. The main components of RFID TAG simple equivalent circuit are Capacitor in Parallel to Resistor and additional Parallel inductance Antenna Unit . The RFID equivalent circuit Under Losses
