Modification of antenna radiating characteristics with multi-impedance loading

For a radiating linear antenna, the loading of
M + N
appropriate impedances at
M + N
specified locations can lead to: 1) producing
M + N
desired currents at
M + N
specified points along the antenna, 2) producing
M + N
desired radiation fields in
M + N
specified directions, 3) maintaining desired input impedances at
M + N
different frequencies, or 4) any linear combination of cases 1), 2), and 3). With
M + N
pure reactive loadings, only
(M + N)/2
values of antenna characteristics can be specified. A method was developed to solve the nonlinear equations in the analysis.