H

Harmonic

Sine wave that is multiple of a fundamental frequency.

High-pass filter

A tuned circuit which disallows Frequencies below the cut-off frequency

Holography

The science dealing with three-dimensional optical recording.

Horizontally polarized wave

Electromagnetic wave that has the electric field in the horizontal plane.

Hybrid circuit

Circuit that joins two technologies (passive and active components) onto one microelectronic circuit.

Hysteresis

In respect to Schmitt Trigger circuits, it is the difference between the upper and lower trigger points