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In this paper, we analyze the characteristics of a printable mid-range one transmitter coil to four small receiver coils wireless power transfer (WPT) system. The size of the transmitter coil is 40.4cm ×40.4cm × 2mm. The four receiver coils is identical and each one has the size of the 13.6cm × 13. 6cm × 1mm. The spacing distance is 80cm between the transmit coil to the surface of the four receiver...
Split-ring resonators (SRRs) and continuous metallic wires were used to realize double negative materials (DNGs). In this paper, we discuss two kinds of DNG structures with different periodic arrangement. One is the conventional model with air separation, and the other is the solid-state structure. Full-wave simulations are used to analyze the effective medium characteristics and the figure of merit...
In this paper, a new multi-functional reflective polarization converter (RPC) is proposed based on an anisotropic metasurface. The metasurface is composed of the periodic array of square patches with truncated corners and a solid ground plane. The RPC is designed based on a single-layer anisotropic metasurface. The reflected magnitude and phase of the anisotropic metasurface are different in two orthogonal...
A reconfigurable electromagnetic band gap (REBG) structure board is analyzed and designed in this paper. It is composed of a mushroom type EBG board, varactor diodes array, chip inductors and a digitally programmable DC controlling circuit. By changing the bias voltage on the varactor diodes, the surface-wave suppressive band gap of the EBG board can be tuned from 1.86 GHz to 6.32 GHz. Furthermore,...
This paper proposes an improved equivalent circuit model for the composite right/left-handed transmission line (CRLH TL) and Dual-CRLH (DCRLH) TL unit cells. A pseudo-inverse technique is first implemented to extract the primary equivalent circuit. By using the conventional filter synthesis technique, the retrieval primary equivalent circuit is further transformed to a typical band-pass/band-stop...
We present the design and performance characterization of a thin metamaterial plate for generation of orbital angular momentum (OAM) modes of a millimeter-wave beam, which can carry independent data streams over the same physical medium. The plate has a thickness of 1.56 mm, and consists of 3.06 × 0.68 mm rectangular apertures with spatial variant orientations. It generates OAM beams l = +1 and l...
A two-dimensional Luneberg lens designed using a symmetrical metamaterial cell to operate a wide frequency band covering 8GHz–12GHz is proposed and studied. The proposed Luneberg lens is composed of an array of complementary circle cells and embedded in a parallel-plate TEM waveguide. Due to high resonant frequency of the complementary circle cell, the equivalent refractive index is nearly constant...
A wideband and low-profile circularly polarized antenna using metasurface for WLAN or satellite communication applications is proposed. The proposed antenna consists of a planar slot coupling antenna with an array of metallic rectangular patches which can be viewed as a metasurface. The metasurface is utilized to adjust axial ratio (AR) for circularly polarized radiation and the slot is angled at...
The near-zero refractive index metamaterials (ZIM) have attracted more and more attentions because of their novel properties. In this paper, a theoretical analysis of a patch antenna with different ZIM superstrates has been given, which gives an insight into the mechanism of directivity enhancement using three different ZIM metamaterials as the antenna's superstrates. It shows that double near-zero...
In this paper, we present a kind of highly sub-wavelength negative refractive index metamaterials for operation at radio frequencies. A dual layer design consisting of planar spiral and meandering line with metallic strips enables the metamaterials with the properties of effective negative permittivity and permeability simultaneously, i.e. negative refractive index. Moreover, its cell size is about...
Two novel wavy electromagnetic bandgap (EBG) structures have been proposed and applied to power/ground plane pairs for ultra-wideband ground bounce noise (GBN) suppression. The proposed two designs have shown good performance. The -40 dB suppression bandwidth of the first design is from 344 MHz to 20 GHz. For the second design, the -49 dB suppression bandwidth is from 304 MHz to 20 GHz. Both results...
In the past decade, left-handed metamaterials (LHMs), which were first named and theoretically discussed by Veselago [1], have been extensively studied throughout the world. They are composed of arrays of split-ring resonators (SRRs) and wires [2], [3] which exhibit negative permittivity and permeability, respectively. The first LHM was constructed and experimentally demonstrated by Smith et al. in...
In this paper, a novel uniplanar compact EBG structure which integrates L-bridged EBG structure with slits is proposed for ultra-wideband GBN suppression in PCBs. The GBN suppression bandwidth is broadened to cover from 432 MHz to 15 GHz without using multilayer and cascading different period structures. The distinctive behavior of the new EBG power plane in ultra-wideband suppression of the GBN is...
In this paper, we report our experimental and numerical results, confirming the phenomenon of dual in-phase reflection, i.e. dual-resonant behavior, for a TM-polarization plane wave oblique incidence on the conventional mushroom-like EBG structures. A modified local resonance cavity (MLRCC) model of EBG structures has been presented to explain the essential features of dual- resonant behavior and...
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