MDirectlyMatchedAntvRBt天线设计.pptVIP

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Proximity Antenna Training for 13.56 MHz M210_Directly-Matched-Ant_V11-RBt -* Philips Semiconductors Directly matched antenna Directly matched antenna RC500 RC400 (or other Reader) EMC- Filter Rx Tx Rx- Circuit Matching Z=700? Antenna Matching Z=700? Directly matched antenna Directly matched antenna 3) Tuning 5) Finetuning 1) Matching 6) Receive Circuit Requirements: load impedance = 700? ! 1) Matching 2) Resonance resonance at 13.56 MHz 2) Resonance 4) Q-factor quality factor ? 35 quality factor ? 100 4) Q-factor 6) Receive Circuit 2) Resonance 3) Tuning 4) Q-factor 5) Finetuning 1) Matching Directly matched antenna Guideline: Design a coil Calculate the parallel capacitance Tune resonance and impedance Connect antenna to the RC500 Tune again Check (and adjust) the Q-factor Finetune resonance and impedance Find the values for Rx-circuit 3) Tuning 4) Q-factor 5) Finetuning 6) Receive Circuit Directly matched antenna Complete antenna Antenna Coil Directly matched antenna Antenna coil La Lb RCoil RCoil @13.56 MHz! L and R of the antenna coil shall be measured at 13.56 MHz (impedance analyser or L-C-R Meter). La+b = L: coil inductance l: length of the conductor circular: l = 2*?*r (r=coil radius) square l = 4*a (a lateral length) d: diameter of the conductor N: number of turns ?: shape factor ? =1.07 for circular coils ?=1.54 for square coils Estimation: Directly matched antenna Antenna coil 0 5 10 15 20 0.5 1 1.5 0 5 10 15 20 1 2 antenna radius [cm] antenna radius [cm] L [μH] N La Lb RCoil RCoil Directly matched antenna Simplification Due to the symmetrical circuitry of the whole antenna the antenna can be simplified: Directly matched antenna Calculate the external resistor Consider the power consumption! MIFARE Q = 35 I*CODE Q = 100 General: Directly matched antenna Calculate the capacitors with Remark: there is an Excel-Sheet available, that supports this calculation. Directly matched antenna Es

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