Here Fermat spiral is introduced into Greek-ladder sieves to generate multiple different point spread functions along light propagation and further to realize multiplanar anisotropic imaging. Theoretical analysis and experimental results show that this kind of diffractive lenses has trifocal spots on the ...
This paper proposes a new structure called the Fermat spiral array (FSA) to replace the conventional hexagonal or ring array for the sub-aperture arrangement of a multi-aperture imaging system. The point spread function (PSF) and modulation transfer function (MTF) of the imaging system are ...
Reconfigurability in antenna systems is a desired characteristic that has attracted attention in the past years. In this work, a novel class of spherical Fermat spiral multi-port antennas for next-generation wireless communications and radar applications is presented. The device modelling is carried ...
In this work, a novel class of spherical Fermat spiral multi-port antennas for next-generation wireless communications and radar applications is presented. The device modelling is carried out by using a computationally enhanced locally conformal finite-difference time-domain full-wave procedure. In ...
Here Fermat spiral is introduced into Greek-ladder sieves to generate multiple different point spread functions along light propagation and further to realize multiplanar anisotropic imaging. Theoretical analysis and experimental results show that this kind of diffractive lenses has trifocal spots on the ...