This letter shows that, by the proper use of time modulation in equispaced linear arrays with uniform excitation distribution, it is possible to maintain the sidelobe zone of the radiated power under certain-previously stipulated-level whereas the undesired harmonics are minimized. In addition to that, the further extension of the technique to nonequispaced arrays permits to obtain broadband response, by simply searching the positions of the elements that reach to the desired power pattern behavior within the required bandwidth.

No abstract

Antenna design specifications do not usually restrict the phase of the radiated field. Antenna synthesis techniques generally exploit this freedom only indirectly, but direct phase perturbation can be fruitful.

As expressed in earlier works, if filled nulls are required in a power pattern generated by a Taylor line source, their corresponding roots must be complex. This leads to a multiplicity of solutions emerged from the fact that the power pattern keeps unaltered if the signs of the imaginary part of the roots are changed. In view of this attribute, the selection of the most favourable roots set -in terms of variability of amplitude excitation distribution, for example-is allowed. It is shown in this paper that, if the pattern is symmetric, a further consideration, never reported so far, can increase the number of available solutions.