Superoscillatory antenna arrays for sub-diffraction focusing at the multi-wavelength range in a waveguide environment

We presented a method of designing a superoscillatory waveform via analogy with superdirectivity. Using this method, we designed a superoscillatory antenna array which forms a sub-diffraction focus within a waveguide, 5 wavelengths away from the source. The subwavelength focus formed has a FWHM of 0.6 times that of the diffraction-limit; both the focal width and the image distance can be further improved with power and sensitivity trade-offs.