A dipole with a tuned parasitic radiator

The electric field, the front/back ratio, and the input impedance of an antenna with a single, tuned, parasitic radiator at constant power are determined, with the newly available approximate second-order self- and mutual impedances used instead of the previous first-order values, which were much less accurate. Theoretical curves for the field and for the front/back ratio are compared with the experimental data of several investigators and it is shown that, if account is taken of significant factors, theory and experiment are in agreement.