Chapter 6
Reader Antennas
6.1 Not Just for Insects Anymore 
In Chapter 3, we learned that an antenna is a device to produce a distribution of currents and charges that do not cancel when observed from far away. We also introduced several properties of antennas that bear on their utility in an RFID system:
• Gain and radiation pattern: the extent to which the power radiated from an antenna is concentrated in some directions in preference to others;
• Effective aperture: the equivalent area from which a receiving antenna collects energy;
• Polarization: the orientation of the electric field radiated by the antenna;
There are three other key parameters ...
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