Small Fractal Antennas
نویسندگان
چکیده
Antennas for hand-held communication devices are necessarily small, and typically use wavelengths λ that are large compared to the size of the antenna. This typically implies that the magnitude of the antenna reactance X (= imaginary part of the antenna impedance) is large compared to that of its radiation resistance Rrad (which is related to the time-average radiated power P and the peak current I0 at the feedpoint by P = I 2 0Rrad/2), so that it is challenging to build an effective impedance matching circuit between the feedline and the antenna. Furthermore, small antennas use small conductors so it may be that the Ohmic resistance ROhm of the antenna is significant compared it radiation resistance, 1 which lowers the antenna efficiency, defined as
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