TE Surface Wave Resonances on High-Impedance Surface Based Antennas: Analysis and Modeling (original) (raw)
Related papers
Direct Use of the High Impedance Surface as an Antenna Without Dipole on Top
Antennas and Wireless …, 2011
High impedance surfaces (HISs) have been proposed and used as substrate for dipoles for realizing low-profile antennas. Here, we show that HISs can be used directly as low-profile antennas with a single feed point, without any dipole on top. The structure is made of only two metallic layers, the patterned surface and the ground plane below, at a subwavelength distance. We analyze two possible feeding mechanisms of an HIS made of dogbone-shaped conductors, though the ideas proposed here can be applied also to other HIS structures. We show that broadside gain of the order of 7-11 dBi can be obtained. We also explain that radiation of the HIS is in part related to a TM-like leaky wave with attenuation constant that is not as small in contrast to other standard high-gain leaky-wave antennas.
Planar periodic metallic arrays behave as artificial magnetic conductor (AMC) surfaces when placed on a grounded dielectric substrate and they introduce a zero degrees reflection phase shift to incident waves. In this paper the AMC operation of single-layer arrays without vias is studied using a resonant cavity model and a new application to high-gain printed antennas is presented. A ray analysis is employed in order to give physical insight into the performance of AMCs and derive design guidelines. The bandwidth and center frequency of AMC surfaces are investigated using full-wave analysis and the qualitative predictions of the ray model are validated. Planar AMC surfaces are used for the first time as the ground plane in a high-gain microstrip patch antenna with a partially reflective surface as superstrate. A significant reduction of the antenna profile is achieved. A ray theory approach is employed in order to describe the functioning of the antenna and to predict the existence of quarter wavelength resonant cavities.
2009 59th Electronic Components and Technology Conference, 2009
We present a metamaterial substrate designed to act as a high impedance thin slab that can be used to integrated lowprofile (subwavelength thickness) antennas in components or packages. A transverse equivalent network (TEN) model accurately describing the reflection properties of the impedance substrate is also provided to facilitate its design. Then, we develop a low profile planar antenna consisting of a printed dipole located on top of the parallel metamaterial substrate. The high impedance of the substrate permits to locate the metallic dipole very close to the substrate itself without inhibition of the dipole radiation. The substrate prevents radiation from traveling across the substrate, resulting in a low profile antenna with high efficiency, even though the antenna system is integrated on top of a lossy structure. Two possible feed structures for the dipole over the impedance surface are considered, and simulation data are presented to illustrate their respective performance.
Iee Proceedings-microwaves Antennas and Propagation, 2006
New designs of artificial magnetic conductors (AMC), including hard and soft surfaces and dual-polarised high-impedance surfaces are realised by printed dipole/slot frequency-selective surfaces (FSS) implemented on a grounded dielectric slab. Multiband designs of hard and soft surfaces are proposed based on the use of FSS structures with different resonance lengths and orientation of dipoles/slots. In addition, dual-polarised high-impedance surfaces are realised by FSS structures with elements of different shapes (cross, loop), which create high impedance for both TE and TM polarisations. Commercial software EMPiCASSO is used for the fullwave analysis of presented FSS configurations. A printed slot FSS is proposed for design of a low-profile monopole antenna. The simulation and experimental results of return loss and radiation patterns are presented, demonstrating the effect of a high-impedance surface on scattering and radiation characteristics of a low-profile antenna.
Analytical Modeling of Surface Waves on High Impedance Surfaces
NATO Science for Peace and Security Series B: Physics and Biophysics, 2009
In this paper, analytical modeling of natural modes is proposed for the rapid and accurate analysis of various high impedance surfaces (HIS) composed of dense grids of frequency selective surface (FSS) elements printed on an electrically thin grounded dielectric slab. The model is based on the homogenization of grid impedance in terms of effective inductance and capacitance, which are obtained from the full-wave solution of a plane-wave scattering problem in the quasi-static limit via the averaged impedance boundary condition. It takes into account a single Floquet mode and requires modeling only a single unit cell of the periodic FSS grid, resulting in simple analytical expressions. This enables one to accurately capture the physics of surface-wave propagation in the resonance band of HIS structures within the limits of homogenization.
High-Impedance Surface Design Considerations
2019
In this communication, High Impedance Surfaces (HIS) based on patches are considered. The possibility to use the patch width as an additional degree of freedom for antennas is investigated. Within the limitation of a single linear polarization, rectangular patches allow adjusting the surface impedance value while keeping identical the in-phase reflection property of such metasurfaces on the same frequency range. With this approach, a bandwidth of 17% is achieved by using a dipole antenna over a HIS.
Analysis of High Impedance Surface Dimensions on Microstrip Patch Antenna
International Journal of Engineering and Technology, 2012
This paper presents a novel design for the implementation of a patch antenna over a high impedance surface. Due to the growth of the wireless communication market, many applications and communication systems require integrated antennas of small size, low cost, low profile, and with enhanced performance characteristics. Unlike normal conductors, this new surface does not support propagating surface waves, and its image currents are not phase reversed. The geometry is analogous to a corrugated metal surface in which the corrugations have been folded up into lumpedcircuit elements, and distributed in a two-dimensional lattice.
Antenna on Cavity Backed High Impedance Surface
A low profile (0.019 λ), light weight, linearly polarized antenna has been designed for 0.9 GHz application using a double layered via less high impedance surface (HIS). The weight of the antenna is reduced by removing the dielectric layer between the HIS and the ground plane. In order to suppress the back lobe we propose the use of a cavity. Since the entire structure lies below the surface of the ground, the proposed antenna, can be used on moving platforms, especially for airborne applications.
Magnetic properties of novel high impedance surfaces
IET Microwaves, Antennas & Propagation, 2007
Resonant magnetic properties of recently introduced high-impedance surfaces are studied using analytical modelling and numerical simulations (HFSS and IE3D packages). It is found that the new structure can be effectively described as a layer of an artificial magnetic medium (AMM) in two different situations: plane wave reflection and loading of patch antennas. A rather wide frequency band of resonant effective permeability has been demonstrated in both theory and simulations. The resonant band is especially wide when the structure (considered as an AMM) interacts with the field of a patch antenna.