RF Glossary: H | Terms Starting with H

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

Half-Power Beamwidth (HPBW) — The angular width of the main lobe of an antenna pattern measured between the -3 dB points where power is half the peak value.

Harmonic — A signal at an integer multiple of the fundamental frequency, generated by nonlinear behavior in amplifiers, mixers, and oscillators.

Heterodyne — A frequency conversion technique that mixes two signals to produce sum and difference frequencies.

Highpass Filter (HPF) — A filter that passes frequencies above a specified cutoff frequency while attenuating lower frequencies.

Horn Antenna — An antenna formed by gradually flaring the open end of a waveguide to provide a smooth impedance transition to free space.

Hybrid Coupler — A four-port device that divides an input signal into two equal outputs with a specific phase relationship, typically 90 or 180 degrees.

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