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When a vertical dipole antenna is used in conjunction with a loop antenna for direction finding then the field pattern obtained will be?
Wiki User
∙ 14y ago
Loop antenna generate the same field as electrical dipole, but E and H are exchanged (a proof can be obtained this way: you align an electrical dipole with an axis, say z, and a loop antenna with z - you have to define surface orientation - then you apply duality theorem, calculate far field and you got it).
For instance, in spherical coordinates (r,phi,theta) you have
el. dipole {Etheta,Hphi}
loop ant. {Ephi,Htheta}
So, you can superpose the two fields and see that you have gained polarization independency (if an electrical dipole is aligned with z-axis and has its gap at z=0, it will receive very well Etheta, not at all Ephi (plane z=0), if you put a loop antenna "around" electrical dipole - like a ring around dipole's gap, lying on z=0 plane - it will receive very well Ephi (plane z=0) ).
This is the way to make triaxial sensor, which have to be polarization independent.
Wiki User
∙ 14y ago
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