Abstract
In this paper, the analysis of design, fabrication and measurement of a high gain dual frequency RFID reader antenna, proposed for ISM bands of 2.45GHz and 5.8GHz, is discussed with overall explanations. The antenna is composed of a U-shaped copper strip with unequal arm, a printed rectangular ring and the ground plane. The antenna operates over 2.37GHz to 2.49GHz, of 120MHz for the lower band; while the upper band exhibits good impedance bandwidth of 420MHz (from 5.55GHz to 5.97GHz), where return loss of -10dB is taken as the reference for both bands. The U-shaped feeding strip excites the rectangular ring effectively by providing a good impedance matching with over 98% of efficiency in both the frequency bands and also 9.56 and 10.17dBi gain in the lower and higher frequency band, respectively. Furthermore, the analytical parametric study facilitates more elaboration of the design and optimization processes for the antenna researchers. Copyright (C) 2010 Praise Worthy Prize S.r.l. - All rights reserved.