I'm a bit confused and I would appreciate it if someone could explain the theory behind this: Say you have a helical antenna, one end of the antenna is connected to a coax cable and the other end is just let loose right? Where's the ground connection for this antenna?
And my second question is, say you had the exact same helical coil antenna but you applied a + and - voltage at both ends. Is this the same thing? I mean, do these two (helical antenna & helical inductor coil) produce the same EM fields and whatnot?
I'm asking this because I think what the guys at MIT did for wireless power transfer is they they used two coils but I'm not sure if they're antennas or simple LC circuits where those giant coils were inductors...
And my second question is, say you had the exact same helical coil antenna but you applied a + and - voltage at both ends. Is this the same thing? I mean, do these two (helical antenna & helical inductor coil) produce the same EM fields and whatnot?
I'm asking this because I think what the guys at MIT did for wireless power transfer is they they used two coils but I'm not sure if they're antennas or simple LC circuits where those giant coils were inductors...