RF Glossary: E | Terms Starting with E

E-Plane — The plane containing the electric field vector and the direction of maximum radiation in a waveguide or antenna.

EIRP (Effective Isotropic Radiated Power) — The product of transmitter power and antenna gain relative to an isotropic radiator. Represents the total radiated power in the direction of maximum gain.

Electromagnetic Compatibility (EMC) — The ability of electronic systems to operate without causing or being affected by electromagnetic interference.

Electromagnetic Interference (EMI) — Unwanted electromagnetic energy that degrades the performance of electronic equipment or communication systems.

EVM (Error Vector Magnitude) — A measure of modulation quality that quantifies the deviation of received symbols from their ideal positions in the constellation diagram.

Envelope — The boundary of the amplitude variations of a modulated RF signal over time.

Evanescent Mode — A waveguide mode operating below its cutoff frequency where the fields decay exponentially rather than propagating.

Excess Noise Ratio (ENR) — The ratio, in dB, of the noise power produced by a noise source to the thermal noise power of a matched load at a reference temperature.

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