Why the fringing field is bended at the edge of the microstrip antenna?

Hi,

Fringing fields are always due to the fringing effects and it is always bended. It is like the coupling fields between two microstrips. It is something like that always exists and you can not answer why it exits! But it is there and it does all the magic.

Also, the better way of explanation is electromagnetic lines extend circularly from the center of the strip and when it is coupled on the edge of the strip it is called as fringing effect and that is always circular.

Thanks