plz explanation abt loop and probe coupling

[ysenthilece]

plz explanation abt loop and probe coupling

how does these work..more of an intutive explanation required...

and on wat basis ..we have to choose between these

 

[aboozar.hamidipoor]

as you know the magnetic field and electric current are related to each other by the first maxwell equation and also electric feild with magnetic current.

this means that every where a linear time harmonic electric current exist there is a magnetic field around it and vice versa. in fact a linear electric current could be source for a rotative magnetic field and a magnetic field could be source for a linear electric current.

now you suppose you have a closed recangular cavity contains 6 coductive faces it is not possible for outside waves to penetrate to this cavity and so they could not produce any internal cavity modes. but if you place a linear electrical current probe in this cavity it could produces magnetic field modes according to the first maxwell equation.