Hi,
Can anybody tell me how to recognize modes by looking at E field/Surface current distribution in the attached figure, is it TM12 ?
Thanks,
Find pictures of the current and field distributions of different modes on the internet, and see which ones look like your results.
I also make the same recommendation, I think in this case it is the mode, TM20.
How many half-wavelengths of current variation do you think there are along the patch?
How many peaks, how many nodes?
It is TM12. As shown clearly in the given figure, the number of half-cycle present in the x-axis is one, and the number of half-cycles present in the y axis is two. As tangential components of electric field present over the surface, it is the transverse magnetic mode.
There seems to be no variation of the electric field along the patch (y), except for end effects, so one mode number is 0. There is one half wave variation across the patch (x), so the other mode number is 1.
From the diagram it appear that That there is two half cycle variation in x-axis direction and there no variation in y-axis direction so the mode excited shell be T20
There are not two half cycles across the x-axis. It goes from a positive maximum at one edge to a negative maximum at the other. This is a half cycle.
From the diagram attached as a PNG file it is clearly visible that number of half cycle variation in x-axis direction is two, having respective vector direction are opposite. and as Malcom White Sir has correctly point out there is some variation in y-axis direction at near the edges corner, but it can not be consider predominate variation. Thus no variation in y-axis direction. Hence excited mode appear to be TM20
Shrivastav a.k.
You are wrong. The boundary condition at the edge of the patch is open circuit. The electric field will be a maximum here. Across the x direction it is a maximum at both edges and zero in the middle. This is ONE half cycle.
Hi
See the below link:
https://www.youtube.com/watch?v=nDWufuhGzOs
Regards;
Mousa
- Badges
- Science topic
- Similar topics
- Philosophy
- Philosophy Of Science
- Reasoning