football ground plane

时间：04-12 整理：3721RD 点击：

in some antenna design, small ground was used. So is it possible that a pole plane of gain or radiation patter will be produce at the azimuth plane of ground plane. For GTD, some field will deflect to below ground, so i wonder the field at the azimuth plane theta=90 will not be a pole. Is it right?

Could not understand..can you please rephrase it.

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I had simulated patch antenna with finite GND using IE3D I i get it back I'll surely post it here. The modelling is little bit tricky and tedious and I remember it generated a large 3D mesh and took enough time. As I remember for a patch antenna with a GND of 6h extention at all sides gave me approximately 17 dB front to back ration. I also performed a quick experiment and obtained 14.5 dB front to back ratio. There will be a significant back radiation for both E-plane and H-plane.

In case of the patch antennas used in the mobile phone..many types of antennas are used. They are normaly shorted, with slot to make compact size and suitable for multiband and even sometimes the ground plane is so small the the difference between front and back radiation is smaller than 3 dB.

I also used ie3d for simulation. but the calculated pattern at azimuth plane is null. i think this is a bug of ie3d coz field should be existed at this plane if finite ground(small ground) is used. What do you think?

Bag full of bugz are there in IE3D. And also in radiation pattern calculated by IE3D is _ALWAYS_ buggy for infinity GND microstrip antennas. But in your case I feel some thing gone wrong in your modelling.