I am curious to know how RF signal is transmitted through wirebonds. I thought that in microwave transmission lines, the energy was stored in electric and magnetic fields inside the dielectric material which stays between two conductors. I imagine that this is the case for coaxial cables and microstrip lines for example.
However, I can't see how wirebonds transfer the RF signal. Where would be the ground plane in this case ?
According to the microwave101, wirebond can be modelled as an inductance element whose impedance depends on the diameter and the length of the wire.
Yet, I still can't see where the energy is stored physically.