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RFID天线设计

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antenna circuit design for rfid applications(microchip)_AN710
Antenna Circuit Design for RFID Applications
Author: Youbok Lee, Ph.D. Microchip Technology Inc.

REVIEW OF A BASIC THEORY FOR RFID ANTENNA DESIGN
Current and Magnetic Fields
Ampere’s law states that current flowing in a conductor produces a magnetic field around the conductor. The magnetic field produced by a current element, as shown in Figure 1, on a round conductor (wire) with a finite length is given by:

INTRODUCTION
Passive RFID tags utilize an induced antenna coil voltage for operation. This induced AC voltage is rectified to provide a voltage source for the device. As the DC voltage reaches a certain level, the device starts operating. By providing an energizing RF signal, a reader can communicate with a remotely located device that has no external power source such as a bat……
RFID天线设计
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