Need to Know More?
Technical notes: http://www.ti.com/rfid/docs/technotes.shtml
Free space field and loss calculations: http://www.softwright.com/faq/engineering/Free%20Space%20Field%20and%20Loss%20Calculations.html
Calculations: Free Space Loss: http://www.terabeam.com/support/calculations/free-space-loss.php
Free Space Loss Calculations: http://www.maxstream.net/helpdesk/article-13
Effective Isotropically Radiated Power (EIRP): http://www.rfcafe.com/references/electrical/eirp.htm
Effective Isotropically-Radiated Power: http://www.answers.com/topic/effective-isotropically-radiated-power?method=6