Analytical design of inhomogeneous flat lenses for high gain applications in an arbitrary direction

Abstract

To the best of our knowledge, in this paper, a new technique is presented for designing and analyzing inhomogeneous flat lenses. The technique is based on the critical angle theorem. Slab and wedge lenses are presented in this manuscript. The designed lenses are frequency independent, so they operate in the broadband frequency bandwidth. The method presented here can be generalized to all inhomogeneous structures, and the input and output layers of the proposed flat lenses are impedance-matched to the circumference. The proposed lenses are validated with COMSOL multiphysics.

Design and analysis of multi‐layer SIW coupler to use in phased array antenna feed network

“…Only the phase compensation is needed to create a planar wave for the reflection array mode [15,16]. A dielectric-based reflectarray antenna is another way to design inhomogeneous structures [17][18][19]. In this method, the phase distance is compensated by changing the thickness or refractive index of the profile.…”

Broadband inhomogeneous lens with conical radiation pattern

“…There are several methods to have an antenna with broadband and high directivity radiation beam. Planar transmit-arrays and reflectarrays designed based on frequency selective surfaces (FSS) 24 , 25 or homogeneous 26 and inhomogeneous 27 dielectric are some methods to achieve high-gain radiation patterns. The complexity of construction, limited bandwidth, and the realization of multiple separate layers are some of the main drawbacks of metamaterial-based methods.…”