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Patch Antenna Radiation pattern dilemma

Patch Antenna Radiation pattern dilemma

Patch Antenna Radiation pattern dilemma

(OP)
The book "Antenna Theory & Design" by Stutzmand & Thiele says that in patch antenna maximum radiation happens perpendicular to the patch (along z=0) with the patch lying in the x-y.

My dilemma: The reason I fail to see the radiation coming out perpendicular (top of patch) to the patch (+z direction) is because of the ground under it. Based on image theory the effective E-field will be confined to space between the patch and the ground. Thus I can only imagine that the fringing field (which decouples when charge is cancelled) is responsible for the field pattern.
Please see the attachment for my field pattern drawing.
 
If the gnd underneath patch didn't exist then I do see how the max radiation would be perpendicular to the middle of the patch on both sides of the patch as in a dipole.

Please help resolve my mis-understanding (somewhere). I appreciate your reading.

RE: Patch Antenna Radiation pattern dilemma

there's current on the top of the patch antenna and out on the ground plane that radiates the field.

Mathematically, it's common to describe the two open ends to calculate the radiation patterns, and this could hint there's no current on the top of the patch.

kch

 

RE: Patch Antenna Radiation pattern dilemma

(OP)
Hello Higgler
I don't understand. Could you please elaborate? I have been hoping to see graphical view of E-filds vs time for Patch Antenna but have not seen any yet. Thank you for replying

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