Anisotropic fractal metasurface‐based antenna with contrary beams

Abstract

The capabilities of the dual-band bidirectional dipole antenna to couple near-field with the metasurface have been investigated both numerically and experimentally. By properly positioning the radiating element with respect to the metasurface, the proposed antenna can emit in forward or in the backward direction. It is shown that the array of fractal closed ring resonators formed as the anisotropic metasurface can be excited to generate the opposite angular beams even though the reflection coefficient of the metasurface is high with the same value of 0.8. This is due to the fact that the conversion of evanescent to propagation waves from transmitting closely antenna to the far-zone existed. To our knowledge, this is the first report for a metasurface applied to dualband antenna with contrary beams. This proposed metasurface-based antenna concept may present new opportunities in the design of multifunctional antennas. V C 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:715-720, 2017; View this article online at wileyonlinelibrary.com.ABSTRACT: In this article, a simple hexagonal metamaterial is presented. Different from the design method of parameters optimization, the Figure 8 The corresponding dependencies of front-to-back ratio (FBR) as function of the distance k0/N. [Color figure can be viewed at wileyonlinelibrary.com]

Design of a PIN Diode-Based Reconfigurable Metasurface Antenna for Beam Switching Applications

“…Based on these two controllable functions of the proposed metasurface, we then further design a feeding dipole radiator to realize a compact beam switching antenna, and its radiation patterns can be electrically controlled by the applied bias voltage across the PIN diode. In contrast to our previous work on the realization of contrary beams at different frequencies [33], the PIN diode-based metasurface proposed in this paper allows to generate antenna beams in opposite directions at the same operating frequency.…”

A reconfigurable phase gradient metasurface antenna for beam steering

“…But they have drawbacks of bulky structures and high cost 1 . The metasurface enables beam control, 2 using only a single antenna. In addition, different forms of metasurface can achieve lots of different functions, such as radar cross section reduction, 3,4 polarization conversion, 5 gain enhancement, 6 and so on.…”