Advantech EKI-6322AG Manual do Utilizador descarregar pdf (Página 54)

Appendix

Antenna concepts and Installations

I.1. Basic Terminology

- Transmit Power

The RF power coming out of the antenna port of a transmitter. It excludes the signal loss of the

coaxial cable or the gain of the antenna, and is measured in dBm, Watts or milli-Watts

- Receiver Sensitivity

The weakest RF signal level (usually in negative dBm) that a radio needs to receive in order to

demodulate and decode a data packet without errors.

- Antenna Gain

The ratio of how much an antenna increases the RF signal over a specified low-gain radiator.

Antennas achieve gain by focusing RF energy.

- EIRP

Equivalent Isotropically Radiated Power is the power actually radiated by the antenna element. It

takes into account the antenna gain.

EIRP (dBm), performance of transmitting system

= Total Output Power of device – Cable Loss + Antenna Gain

Free Space Loss (FSL)

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