Antenna - Theory .com: The Antenna Site

Antenna Basics Antenna Types Smith Charts Antenna Measurements

antenna-theory.com :: View topic - patch antenna
antenna-theory.com Forum Index antenna-theory.com
Antenna Theory
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

patch antenna
Goto page Previous  1, 2
 
Post new topic   Reply to topic    antenna-theory.com Forum Index -> Questions Related to Antenna Theory
View previous topic :: View next topic  
Author Message
Schubert
Antenna Wizard


Joined: 08 Apr 2009
Posts: 161

PostPosted: Thu Feb 10, 2011 7:00 pm    Post subject: Fringing Fields Reply with quote

Yes, it is because the finite patch above a larger ground plane. Even if they were the same size, you would have fringing fields.

Just think about it. Suppose you had a patch above a ground plane, and suppose there was positive charge on the patch, and the ground below was 0 potential.

The E-field lines must direct directly out from the surface, because there can be no tangential E-field on a good conductor. So directly under the patch, the fields must go straight down.

On the edges, the fields don't abruptly go to zero outside the region of the patch antenna. That is, the E-field exists everywhere due to a point charge. Hence, the E-field points away from the edge of the patch.

Draw pictures and think through it.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    antenna-theory.com Forum Index -> Questions Related to Antenna Theory All times are GMT
Goto page Previous  1, 2
Page 2 of 2

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group