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Eplane&Hplane
- Thread starter mirok
- Start date
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
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
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.
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.
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.
But, once you decide on a particular direction of radiation to be considered further, then you've also selected *THE* E-plane.
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jbartos
Electrical
- Jan 15, 2000
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