antenna-theory.com

[admin]

The older antenna textbooks don't have any information on the modern antenna measurements, namely TRP, TIS, and SAR.

To try to get this information out, I've added pages on the following topics:

Total Radiated Power (TRP):
http://www.antenna-theory.com/definitions/trp.php

Total Isotropic Sensitivity (TIS):
http://www.antenna-theory.com/definitions/tis.php

Specific Absorption Rate (SAR):
http://www.antenna-theory.com/definitions/sar.php

These measurements are all active measurements in that they are strong functions of not just the antenna, but also the radio and electronics associated with it.

[admin]

I put a whole section on Smith Charts and impedance matching using the Smith Chart here:

http://www.antenna-theory.com/tutorial/smith/chart.php

The Smith Chart is very useful in building real antennas, because you can observe the frequency response of your antenna in a vectorized format (i.e. magnitude and phase of reflection coefficient), which enables more insight than scalar measurements (VSWR, s11, etc).