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RFID+ Exam Cram by Robert Sabella, Eva Zeisel, Mark Brown

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Antenna Field Calculations

There are several calculations regarding the antenna field that you may perform to understand the antenna performance based on power input and other variables. In this section, we discuss antenna gain and loss calculations, free space loss, effective radiated power, and field density calculations.

Antenna Gain and Loss

An antenna gain is achieved by focusing the radiated RF into narrower patterns to get more power coming from the antenna in the required direction, as illustrated in Figure 3.4.

Figure 3.4. Antenna gain.

Antenna gain is the relative increase in radiation at the maximum point expressed ...

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