Simple microwave holograms and moiré fringes using the ´spinning-dipole´ field-perturbation technique

It is shown, both theoretically and experimentally, that a perturbation method of measuring microwave fields can generate simple zone plates with low-intensity fields. The effective wavelength is shown to be less than that actually used and gives rise to a gain in fringe resolution which is beneficial in the formation of microwave holograms.