Impedance properties of capacitively loaded dipoles

The input-impedance variation of a centre-fed dipole with frequency can be much reduced by incorporating capacitances in the dipole arms. For a single capacitance a comparison is made between the results of sinusoidal theory and experimental measurements on a monopole. Satisfactory agreement is obtained. For a triply loaded monopole a v.s.w.r. of better than 2.5 is effectively obtained on a 75¿ cable over a frequency range of greater than 2.5:1.