Reconfigurability Mechanisms With Scanning Rate Control for Omega-Bianisotropic Huygens’ Metasurface Leaky-Wave Antennas

Abstract

In this paper, different reconfigurability mechanisms are proposed to scan the pointing direction at a fixed frequency of recently-proposed leaky-wave antennas based on omega-bianisotropic Huygens' metasurfaces. The tunability of both the waveguide height and the dielectric permittivity of the substrate filling the waveguide are studied, extracting theoretical expressions to predict the dependence of the beam pointing direction with the design parameters. It is shown that it is possible to control the scanning rate, a challenging task for conventional leaky-wave antennas, leading to different performances: high scanning, radiation pattern stability and backward-to-forward scanning. Additionally, the control of the scanning rate is exploited to reduce the beam squinting when varying the frequency. Simulation results of several designs with both impedance sheets and physical realization to implement the metasurfaces demonstrate the validity of the theoretical predictions and the reconfigurability potential of such a structure.

Wide-Angle Frequency-Scanning Array Antenna Using Dual-Layer Finger Connected Interdigital Capacitor Based CRLH Unit Cell

“…In this paper, the feeding network is designed to scan from −45 • to 45 • as f 1 = 3GHz and f 2 = 9GHz. Using expression (11), it can be calculated that the value of d max should be less than 19.53 mm to avoid grating lobe. So, the distance is chosen as 19.5 mm.…”

“…Additionally, metasurfaces have been used to design LWAs [10]- [13]. In [10] and [11], a novel concept of a leaky-wave antenna is proposed using the Huygens' metasurfaces. With the appearance of CRLH-metamaterial, the LWAs can realize a new function of generating alterable patterns in different frequencies [14]- [17].…”

Physical Implementation of Leaky-Wave Antenna with Engineered Aperture Distribution Based on Bianisotropic Huygens Metasurfaces

“…In [6] it was demonstrated that omega-type bianisotropic Huygens' metasurfaces (BHMSs) only need to satisfy a local power conservation condition between the fields on both sides of the metasurface to achieve arbitrary transformations. In this sense, the use of this type of BHMSs has been studied in previous works from some of the authors in order to transform a guided field into a leaky-wave radiated one [7], [8]. This way, the independent control of both wavenumber components was achieved, along with several degrees of freedom in the LWA parameters selection.…”

Printed planar tunable composite right/left‐handed leaky‐wave antenna based on a tunable polymer‐BST substrate

“…34 There has been growing interest in developing planar LWAs due to several advantages, including narrow and high directive beams, frequency-dependent beam scanning capability, smaller unit cell size, modest feeding network, and easier manufacturing. [35][36][37][38] Among planar LWAs, another approach to enhance the capability of the LWAs is to utilize a composite right/ left-handed (CRLH) unit cell. [39][40][41] By realizing the CRLH transmission line, continuous beam scanning of the LWA from backward to forward is achieved.…”

“…The concept of a metamaterial‐based antenna, such as a leaky wave antenna (LWA), had been previously investigated 34 . There has been growing interest in developing planar LWAs due to several advantages, including narrow and high directive beams, frequency‐dependent beam scanning capability, smaller unit cell size, modest feeding network, and easier manufacturing 35‐38 . Among planar LWAs, another approach to enhance the capability of the LWAs is to utilize a composite right/left‐handed (CRLH) unit cell 39‐41 .…”