The plane of the magnetic field in a rectangular waveguide; frequently attributive, especially designating a T-shaped junction of two rectangular waveguides in which one is joined at the side of the other (so that the stem and crosspiece of the T are in the same plane).
Origin
1940s.
Definition of H-plane in US English:
H-plane
noun
Electricity
The plane of the magnetic field in a rectangular waveguide; frequently attributive, especially designating a T-shaped junction of two rectangular waveguides in which one is joined at the side of the other (so that the stem and crosspiece of the T are in the same plane).