Metantenna design with one‐dimensional holographic concept

Abstract

In this paper, metasurface antenna (metantenna) with one‐dimensional holographic concept is proposed and an example of producing 50° radiation beam angle at 16 GHz is taken to certify the metantenna operating principle. We first introduce one‐dimensional holographic theory to simplify the metasurface design. By this means, compared with the traditional two‐dimensional metantenna, the integral structure has fewer unit cells, simpler structure and the beam‐tilt is achieved as well. Simultaneously, to feed the metasurface above efficiently, the tapered microstrip line is modified by adding a sloping metal strip as a plane‐wave surface wave launcher, thus obtaining a smooth transition from Quasi transverse electromagnetic wave to transverse magnetic wave and a broad frequency band of impendence matching. A prototype is fabricated and tested at last. The measured radiation beam angle is 49° at 16 GHz, which approximates to the desired beforehand. On the other hand, this metantenna has a beam scanning angle of 24° to 63° from 13 to 17.5 GHz. The gain is about 13 to 15 dBi and the half power beam width is about 9° in the above frequency range. It has features of stable high gain, narrow beamwidth and high radiation efficiency.

Single/ Multi Beam Antenna Using Genus Holographic Surface for MIMO Applications

“…Where P is the period of the hologram cell (AIS) and the direction of radiation beam, 𝜃 is obtained by equation (6). At small values of M, the radiation angle 𝜃 is approximated to equation (7), where 𝜂 𝑜 is the free space wave impedance (377 Ω) [18].…”

“…Two tapered microstrip transmission lines are used one (connected to the source) for exciting the antenna by generating surface wave and the other is connected to a 50 Ω terminal load. A slanted metal strip is placed with the tapered microstrip line for improving the impedance matching by avoiding electric field disorganizing in between surface wave launcher and metasurface [18]. Table I lists the dimensions of feeding.…”

“…For steering the radiated beam from a source to specific direction, the propagation characteristics of surface waves are utilized. The surface impedance modulation procedure is applied on Artificial Impedance Surfaces (AIS) by varying the size of the AIS elements according to a predetermined phase distribution [18]. One dimension (1D) and two dimension (2D) hologram antennas were presented for manipulating the electromagnetic surface wave propagation [16], [18], [19], [20].…”

“…The surface impedance modulation procedure is applied on Artificial Impedance Surfaces (AIS) by varying the size of the AIS elements according to a predetermined phase distribution [18]. One dimension (1D) and two dimension (2D) hologram antennas were presented for manipulating the electromagnetic surface wave propagation [16], [18], [19], [20]. The 1D hologram antennas have a smaller number of unit cells than the traditional 2D hologram antennas that have large number of metasurface with diverse sizes.…”

“…The 1D hologram antennas have a smaller number of unit cells than the traditional 2D hologram antennas that have large number of metasurface with diverse sizes. Consequently, 1D HAs reduces the computational complexity in surface impedance calculation and reduce the antenna size than the 2D HAs [18].…”