资料介绍
In close proximity to the human body, small loop anten-
nas 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, square or rect-
angular copper trace on a printed circuit board. In some
cases, discrete wires are shaped into loops. AN831
Matching Small Loop Antennas to rfPIC Devices
EQUATION 2:
Author: Jan van Niekerk
2
Microchip Technology Inc. Ploss = I Rloss
INTRODUCTION Note that we assume that the current I is uniform
around the small loop. This assumption is only valid if
In close proximity to the human body, small loop anten- the loop circumference is smaller than one fifth of a
nas outperform small dipole a
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