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# Eplane&Hplane

## Eplane&Hplane

(OP)
hi everybody

I have a problem about underestanding E-plane And H-plane
definition. I will be grateful If anybody can describe it easier for me or  know any website which can be helpful.

tanx

### RE: Eplane&Hplane

Mirok, picture a cartesian coordinate system with the origin on the floor in front of you, the x-axis pointing straight at you, the y-axis perpendiculalry to the right, and the z-axis rising vertically out of the floor.

The H-plane would then be the floor (plane formed by the x and y axes).  The H-plane can be translated in a linear fashion only, up and down the z-axis, by changing the value of z.  It remains "horizontal" to the plane formed by the x and y axes.  It's also like a plane that would slice horizontally through the earth at a fixed lattitude.

The E-plane, on the other hand, would be a vertical wall, perpendicular to the floor, and pivoting about a pole aligned with the z-axis.  The E-plane can be pivoted only (not translated like the H-plane), by changing the reference angle formed between x and y axes.  It would also be like picking a vertical plane to pass from the North pole downwards through opposite lines of longitude (i.e.180 degrees apart at the equator) onwards to the South pole.

The polar equivalent: the H-plane is defined by Theta=pi/2 for all values of Phi (0 to 2pi).  The E-plane is defined by Phi=constant (often a reference angle of zero radians but not necessarily so) and all values of Theta = -pi to pi.

Hope that helps.

Cheers,
DT

### RE: Eplane&Hplane

Another way of looking at it...

The E-plane is the plane of the electric field produced by the antenna elements and it is in the same plane as the elements.  Imagine a dipole antenna with the electric field lines running from one element to the other.

The H-plane is the plane of the magnetic field and it is orthoganal to the E-plane and therefore it is at 90 degrees to the plane of the elements.  Imagine a dipole with the currents in the elements creating rings of magnetic field surrounding them - the rings will be orthogonal to the elements.

### RE: Eplane&Hplane

Further to previous, the term "*The* E-plane" might be confusing at first glance since there are so darn many E-planes around an antenna (one at every possible angle).

But, once you decide on a particular direction of radiation to be considered further, then you've also selected *THE* E-plane.

### RE: Eplane&Hplane

(OP)
The problem is that I cann't  find any relation between the Eplan in horn antenna (which seems to be the reference for our definition)and the Eplane in other antennas like dipole antenna.

### RE: Eplane&Hplane

For your horn antenna, perhaps the old memory aid for waveguide might help:

E - easy to bend
H - hard to bend

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