Abstract
We have theoretically verified the feasibility of the concept of mantle cloak for very high frequency (VHF) antenna communications. While the applicability of the concept has been demonstrated for an infinitely long cylindrical obstacle and infinitely long electric source [Y.R. Padooru, A.B. Yakovlev, and P.-Y. Chen and Andrea Alù, J. Appl. Phys., 112, 104902, (2012)], the use of this cloak in realistic conditions is not straightforward. In this paper as an electric source we consider a typical VHF monopole antenna mounted on ground plane together with a metallic cylindrical obstacle. The both ground plane and obstacle affect the antenna radiation scattering. Nevertheless, we could show that the mantle cloak can bee successfully applied to restore the radiation patterns of antenna even when the source, the cylindrical metallic obstacle, and the ground plane have finite length. We have studied the antenna adaptation in the presence of the cloaked obstacle and found that the complete radiation system is still functional in the bandwidth that is reduced only by 11%.
Highlights
Very high frequency (VHF) radio wave communications used in variety of applications such as railways, maritime and air traffic control, space research, as well as for very high frequency (VHF) radio and television could be strongly perturbed by complicated environmental conditions
In this work we have used an analytical scattering approach as well as the rigorous numerical solution of Maxwell equations to demonstrate how the invisibility concept can be applied to the practical VHF antenna communications
As an electromagnetic source we chose a monopole VHF antenna that is widely used for variety of applications in public and military services
Summary
Very high frequency (VHF) radio wave communications used in variety of applications such as railways, maritime and air traffic control, space research, as well as for VHF radio and television could be strongly perturbed by complicated environmental conditions. In Ref. it has been demonstrated theoretically that the radiation patterns of infinitely long electric source perturbed by an infinitely long cylindrical obstacle can be completely restored with use of mantle cloak. There is no studies, to the best of our knowledge, that demonstrate that electromagnetic cloak can be applied for the monopole antennas affected by a nearby scatter on a finite ground plane. This type of antennas is widely used in VHF frequency range for variety of applications in public and military services. We complete our study by analyzing how the cloak affects these antenna characteristics
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