waves and guides

Simulations:

 rovinna_vlna  Plane wave
 pomala_vlna  Slow wave
 kolmy_odraz  Vertical reflection
 nfo_2_ctvrtvlnna_desticka  Quarter-wave plate
 nfo_2_ctvrtvlnny_rezonator Quarter-wave resonator
 nfo_2_pulvlnna_desticka Half-wave plate
 nfo_2_pulvln_rezon_open  Half-wave resonator (open)
 nfo_2_pulvln_rezon_short  Half-wave resonator (short)
 es10_kruhovy_zavit  circular thread
 es12_nabita_rovina charged plate
 es70_dva_vodice electrical stress between the conductors
 mg06_jeden_zavit one thread carrying a current
 mg08_dva_zavity  two threads
 mg13_6_zavitu long thin coil in the air