This is a consequence of Lorentz reciprocity. For an antenna element  not connected to anything (open circuited) one can write . But for an element  which is short circuited, a current is generated across that short but no voltage is allowed, so the corresponding . This is the case, for instance, with the so-called parasitic elements of a Yagi-Uda antenna where the solid rod can be viewed as a dipole antenna shorted across its feedpoint. Parasitic elements are unpowered elements that absorb and reradiate RF energy according to the induced current calculated using such a system of equations.
This is a consequence of Lorentz reciprocity . For an antenna element not connected to anything ( open circuited ) one can write . But for an element which is short circuited , a current is generated across that short but no voltage is allowed , so the corresponding . This is the case , for instance , with the so - called parasitic elements of a Yagi - Uda antenna where the solid rod can be viewed as a dipole antenna shorted across its feedpoint . Parasitic elements are unpowered elements that absorb and reradiate RF energy according to the induced current calculated using such a system of equations .
What element absorbs and reradiate RF-energy?
What element absorbs and reradiate RF - energy ?
Parasitic
Parasitic