资料介绍
Pcb AntennaAN831
Matching Small Loop Antennas to rfPIC Devices
EQUATION 2:
Author: Jan van Niekerk Microchip Technology Inc.
2 Ploss = I Rloss
Note that we assume that the current I is uniform around the small loop. This assumption is only valid if the loop circumference is smaller than one fifth of a wavelength. For completeness, note that the total power delivered to the antenna is given by the sum of the radiated power and losses. From Equation 1 and Equation 2, we get Equation 3:
INTRODUCTION
In close proximity to the human body, small loop antennas outperform small dipole and monopole antennas [1]. Their size, robustness and low manufacturing cost have made small loops the most popular antenna for use in miniature key fob transmitters. A small loop antenna typically consists of a circular, sq
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