By Douglas B. Miron
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Extra resources for Small Antenna Design (Communications Engineering Series)
At resonance, the power source supplies the resonator losses and the total stored energy is constant. These devices have no easy lumped-element description, so a more general definition of Q that covers all cases to that point was introduced. From [1, p. 269, eq. 13) Power lost per cycle 46 Antenna Fundamentals II The discussion in  above this equation implies that the equation was developed in order to predict the bandwidth in the same manner as with the lumped-element resonators. 14) Paverage Again, this is unloaded Q.
At a given cross-section of the line, the currents are equal in magnitude and opposite in direction. Their radiated fields will likewise be equal in magnitude and opposite in direction at any point in space, providing the wire separation is tiny compared to wavelength. Therefore, the line produces no net radiation. 8(b). The radiated fields from current on these turned-out wires no longer cancel because the currents now have the same space orientation. The current still has to be zero at the open ends of the dipole.
In this case, however, the wave follows the transmission line, and voltage and current waves are generated on the line. The E, H, V, and I waves are as tightly coupled as the E and H waves in space, so that one can’t really say that any one or two cause the rest; they are all caused simultaneously by the applied voltage or current. 7). The less insulation between the wires in twin-lead, the closer v is to c. 7) is replaced by eff, for which various formulas are available. 8) Antenna Fundamentals I The subscripts are “f” for forward, “r” for reverse or reflected.
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