Date post: | 17-Dec-2015 |
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Normal component of B
Bn1s + Bn2 s = 0
Bn1 Bn2
Normal components of B are continuous
No magnetic monopoles!!
dvB dsB 0
Normal component of D
Dn1s + Dn2 s = s s
Dn1 Dn2
Normal components of D differ by surface charge
density
Electric charge
dvD dsD dvv dss
Tangential component of H
Ht1L + Ht2 L = js L
Ht1 Ht2
Tangential components of H differ by surface current
density
surface current
dsHx dlHdsD
j
t dljs
Tangential component of E
Et1L + Et2 L = 0 Et1 Et2
Tangential components of E are continuous
dsEx dlE
dsB
t0
Tangential components of the electric field intensity are continuous
Normal components of the displacement flux density differ by a surface charge density
Normal components of the magnetic flux density are continuous
Tangential components of the magnetic field intensity differ by a surface current density
Tangential component of Emetal
Et1L + Et2 L = 0 Et1 Et2
Tangential component of E is zero.
but Et2 = 0
dsEx dlE
dsB
t0
images• Charge +Q• Equipotential
contours• Electric field E
• Image charge -Q
• Equipotential contours
• Electric field E
Antenna on top of the ground
• Underneath an antenna is an array of conductors
• This creates a ground plane• This effectively makes the antenna
twice as tall