13.56MHz天线设计.pdf

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13.56MHz Proximity RFID Antenna Principle

Overview

Equivalent Antenna Circuitry

Unsymmetrical Antenna

Symmetrical Antenna

Common Mode Currents

Antenna as Transformer 1

Antenna as Transformer 2

Optimum Antenna Radius

Electromagnetic Induction

Law of Biot & Savat 1

Law of Biot & Savat 2

Operating Magnetical Fieldstrength

Coupling coefficient

Maximum Coupling Coefficient

Simplified Coupling Coefficient

Maximum Operating Distance

Summary

13.56MHz Proximity RFID Antenna Principle Customer Application Support, 2004

Overview Overview Equivalent Antenna Circuit Equivalent Antenna Circuit Electric & Magnetic Antenna Electric & Magnetic Antenna Common Mode Currents Common Mode Currents Antenna as Transformer Antenna as Transformer Estimation of Maximum Operating Distance Estimation of Maximum Operating Distance Electromagnetic Induction Electromagnetic Induction Law of Biot & Savart Law of Biot & Savart Coupling Coefficient Coupling Coefficient Optimum Antenna Radius Optimum Antenna Radius Semiconductors

Equivalent Antenna Circuitry Equivalent Antenna Circuitry Energy is radiated. Environment Near field influence detunes antenna. Zant Semiconductors

Unsymmetrical Antenna Unsymmetrical Antenna Electric Antenna: Magnetic Antenna: Electric Antenna: Magnetic Antenna: (“monopole”: e.g. mobile phone, FM-radio) (“loop”: e.g. , E, H I ) H, E U Z Z Z : complex antenna impedance Z = R(f)+jωX(f) Semiconductors

Symmetrical Antenna Symmetrical Antenna ) H, E Magnetical Antenna: Antenna: Magnetical (e.g. , I I Z Electrical Antenna: Electrical Antenna: (“dipole”: e.g. TV, fm-radio) E, H Z U U Semiconductors

Common Mode Currents Common Mode Currents I I I I IGND = 0 IGND = 0 Semiconductors

Antenna as Transformer 1 Antenna as Transformer 1 PCD Antenna Coil k PICC Coil PCD PICC k Φ L1 L2 C2 R2 energy data k : coupling coefficient k = φ φ 2 1 PCD: Proximity Coupling Device („Reader“) PCD: Proximity Coupling Device („Reader“) PICC: Proximity Chip Card („Card“) PICC: Proximity Chip Card („Card“) Index 1: PCD antenna = design parameters Index 1: PCD antenna = design parameters Index 2: PICC antenna = fixed parameters Index 2: PICC antenna = fixed parameters Semiconductors

Antenna as Transformer 2 Antenna as Transformer 2 PCD Antenna Coil k PICC Coil PCD L1 R1 PICC R2 L2 Φ I1 M V20 energy data V20 = open loop voltage V IM ⋅ 1 ⋅ω= 20 M = mutual inductance kM ⋅= 1 LL ⋅ 2 Semiconductors

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13.56MHz天线设计.pdf

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