Dual-Frequency Electromagnetic Cloaks Enabled by Lc-Based Metamaterial Circuits

Abstract

Abstract-A dual-frequency cloak based on lumped LC-circuits is proposed. Multiple LC-resonant tanks are employed to satisfy the specific conditions for dual-frequency operations. In this way, the designed cloak features greatly reduce scattering cross sections at the two working frequencies simultaneously. Besides, explicit design equations are derived for the developed circuit systems. Based on these formulas, the range of the realizable frequency ratio of the presented cloak (the ratio between the two operating frequencies) is discussed. To verify the theoretical predictions, full-wave electromagnetic simulations are implemented. Good consistency between the numerical results and the design theories is achieved.

Coupling Effect of Split Ring Resonator and Its Mirror Image

“…Up to now, nearly almost unique phenomena of metamaterial including the negative refraction [1], invisible cloaking [10][11][12], were observed experimentally in a parallel waveguide system, because waveguide system provides quasi mode distribution but also periodic boundaries, especially the latter of which allows few macroscopic metamaterial elements to exhibit the collective behavior of bulk sample. In contrast to previous reports on coupling effect inside SRR array, we investigate experimentally and numerically on the interaction between a physical SRR and its imaged counterpart mirrored by an electric conductor.…”

“…Exotic research aspects including optics transformation have undergone rapid development with great impact on human's realization of artificial engineering structure but also brought new force to the advance of novel devices such as invisible cloak [10][11][12][13][14][15][16][17][18][19][20][21][22], and Hyperlens [23,24], perfect absorber [25][26][27][28][29]. Split ring resonator (SRR), the seminal building block of metamaterial, can oscillate with circular currents under proper excitation, subsequently produce a magnetic component opposite to the incident magnetic field, and result in negative permeability around its resonance frequency [30][31][32][33][34][35][36].…”

Enhanced Nonlinearities in Double-Fishnet Negative-Index Photonic Metamaterials

“…They have been exploited to develop unusual optical materials and devices, such as negative-index materials [2,3] and "invisibility cloaks" [4,5]. Negative-index MMs (NIMs) operating at optical frequencies have recently attracted considerable attention because of their novel properties in optics [6][7][8][9][10][11][12].…”

Improving the Reliability of Frequency Domain Simulators in the Presence of Homogeneous Metamaterials - A Preliminary Numerical Assessment

“…In the recent years, there has been an explosive activity at the research and industrial level [1,2] in the development and testing of metamaterials (MTM s), as it is demonstrated by the the large number of contributions on theoretical [3][4][5][6][7][8] as well as practical [9][10][11][12][13][14][15] aspects of this emerging field. Such an extraordinary interest is actually motivated by the unique capabilities of these artificial materials to modify the propagation characteristics of electromagnetic waves [1,2], which allows the design of innovative applications which were never before thought possible.…”