E-plane and H-plane

The E-plane and H-plane are reference planes for linearly polarized waveguides, antennas and other microwave devices.

In microwave circuits, a waveguide with three independent ports is called a TEE junction.

[1] For a linearly-polarized antenna, this is the plane containing the electric field vector (sometimes called the E aperture) and the direction of maximum radiation.

The electric field or "E" plane determines the polarization or orientation of the radio wave.

In the case of the same linearly polarized antenna, this is the plane containing the magnetic field vector (sometimes called the H aperture) and the direction of maximum radiation.

Diagram showing the relationship between the E and H planes for a horizontally polarized directional yagi antenna
Diagram showing the relationship between the E and H planes for a vertically polarized omnidirectional dipole antenna