Transformation-optical Fan-beam Synthesis

Abstract

Gradient-index dielectric lenses are generated based on the coordinate transformation by compressing the homogeneous air spaces quasi-conformally towards and outwards the primary source. The three-dimensional modeling is then performed through revolving the prescribed transformational media 180 degrees around the focal point to reach the architecture of barrel-vaults. It is found that all these two- and three-dimensional transformation-optical designs are capable of producing fan-beams efficiently over a broad frequency range with their main lobes possessing the narrow beamwidth in one dimension and the wide beamwidth in the other, while having the great ability of the wide angular scanning. Finally, we propose to construct such four types of fan-beam lenses through multiple-layered dielectrics with non-uniformed perforations and experimentally demonstrate their excellent performances in the fan-beam synthesis.

Homogeneous Multifunction Devices Designing and Layered Implementing Based on Rotary Medium

“…EM field rotator can rotate the internal propagation direction of EM waves and can be used in the antennas and wave-guiding device that provides an approach of polarization transformation 27 . Furthermore, transformation optics has been employed to design communication devices, including beam synthesis/splitters 30 , 31 , antennas 32 , 33 and waveguides 34 . However, it should be noted that most previous works simply investigated the single function of these devices and seldom considered the combining effectives of them.…”

Homogeneous transparent device and its layered realization

“…Besides cloaks, several metamaterial-based functional devices have also been investigated in either theory or experiment. [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] Among various novel applications, transparent devices have recently attracted widespread attention due to their ability to protect the device inside without affecting their performance, and they have shown great potential in antenna protection. By using the compressing or stretching transformation method, a twodimensional (2D) transparent device was first proposed by Yu et al [30] Later, the arbitrarily shaped transparent devices with either conformal or non-conformal boundaries were proposed by Yang et al [31] and Mei et al, [32] and the general expressions of material parameters were developed.…”