Mohammad Jakir Hossain

A new miniaturized negative-index meta-Atom for tri-band applications

Abstract In this paper, a miniature negative index meta-atom was designed; simulated, fabricated and measured based on parallel incidence of electromagnetic wave that can maintain a tri-band applications in microwave spectra. Compare to the other multi-band conventional metamaterial, the proposed meta-atom structure allows miniaturization factor and follows better effective medium ratio (EMR). Finite-integration technique (FIT) based computer simulation technology (CST) electromagnetic simulator was adopted to examine the design of the meta-atom. It exhibits tri-band response in conjunction with backward wave property over a certain frequency band in the microwave regime. Furthermore, the effective medium ratio is considerably improved compared to previously reported metamaterial. Moreover, few parametric analyses were done with the meta-atom. The size, scattering parameters and effective medium parameters of the proposed negative index miniaturized meta-atom is appropriate for tri-band applications.

Depiction of a Combined Split P-Shaped Compact Metamaterial for Dual-Band Microwave Application

The paper imparts the architecture of a compact and combined split P-shaped metamaterial unit cell that is felicitous for dual band of microwave frequency, and it shows negative permeability and permittivity at those frequencies. Two split P-shaped resonators are connected to each other by a metal ink to increase the electrical length, and two modified split-ring resonators (SRRs) reside inside each of it. A correlation was made on the performance after the analysis of unit cell and 1 × 1 array structure. A great transmission coefficient of almost 13 GHz with a 500 MHz band gap at the middle is demonstrated for all of these configurations. The resonator covers L, C, X and Ku band separately with double-negative phenomena at X and Ku band. To justify the performance of the proposed resonator, an analogy is conferred. Due to its compact and auspicious design, double-negative characteristics and the proposed metamaterial have potential to be used for dual-band application.

A Multi-band Planar Double-Incidence Miniaturized Double-Negative Metamaterial

In this research, a new planar double-negative (DNG) metamaterial for multi-band operation has been designed and simulated that can work in the microwave region. The proposed metamaterial structure offers DNG properties for normal and parallel incidence means two axes (z and x) electromagnetic (EM) wave propagation through the metamaterial structure. For along the z-axis EM wave propagation, metamaterial exhibits DNG characteristics in the C band. Similarly, for along the x-axis EM wave propagation, it displays DNG characteristics in the L band. Commercially available computer simulation technology electromagnetic simulator was adopted to observe the design of the metamaterial. The metamaterial has exhibited multi-band retaliation in coincidence with the DNG characteristics and miniaturization factor over the certain frequency bands in the microwave spectra.

An Effective Medium Ratio Obeying Wideband Left-Handed Meta-Atom for Multiband Applications

A new wideband left-handed (LH) meta-atom based on planar modified multiple hexagonal split ring resonators is described in this paper. The LH meta-atom was simulated to maintain left-handed properties at 9.40 GHz. Performance and comparison of different structures were analyzed that follow better effective medium ratio (EMR) and wideband (5.54 GHz) for multi-band operations in the microwave spectra. The finite-difference time-domain (FDTD) method-based CST electromagnetic simulator was implemented in order to observe the design of the meta-atom. The meta-atom showed a multiband response in conjunction with wideband and LH properties above the definite frequency band in the microwave spectra and EMR was considerably improved compared to previously reported metamaterials.

Effective medium ratio obeying multiple octagonal split-ring resonators based metamaterial for tri-band applications

A new tri-band metamaterial unit-cell structure designed and simulated that has multiple octagonal metal rings one inside the other in this paper. The each ring of metamaterial structure delivers a resonance at various frequencies. The number of metal ring resonator has created numbers of resonances. In this paper, different analysis has been performed to verify distinct resonance frequencies, effective medium ratio and effective medium parameters simply by changing the design parameters. Finite-difference time-domain (FDTD) method based Computer Simulation Technology (CST) electromagnetic simulator, which is commercially available is utilized to investigate the design of the metamaterial. The tri-band response has been exhibited of the metamaterial in conjunction with left handed material property over the certain period in the microwave regime. The reported structure has become suitable for S-band (weather radar, radio astronomy, mobile phones, wireless LAN, and GPS), C-band (long distance radio communications), and X-band (satellite communication and space communication) applications and has attained efficient electrically small microwave structure.

Multi-band planar miniaturised negative-index metamaterials

Abstract In this paper, a miniaturised negative-index metamaterial (NIM) based on planar concentric split ring resonators was designed, simulated, fabricated and tested that can maintain NIM properties. The offered metamaterial structure showed miniaturisation factor compared with traditional metamaterial unit cells and conformed better effective medium ratio (EMR). Finite-difference time-domain method-based computer simulation technology for the numerical analyses and a vector network analyser (N5227A) was used for the measurements. The proposed metamaterial exhibited multi-band response in conjunction with the NIM property over the certain frequency bands in the microwave spectra and the EMR considerably improved compared to previously reported metamaterials. The measured results revealed good agreement with the simulated results. The distribution of surface current, electric field and equivalent circuit model were verified for the proposed structure. The size, scattering parameters and EMR parameters of the proposed miniaturised NIM is appropriate for multi-band applications.

Multiple hexagonal split-ring resonators based negative index material for multi band applications

In this paper, a new multiband metamaterial structure designed and simulated of unit-cell that has multiple hexagonal concentric metal rings one inside the other. The each ring of metamaterial structure delivers a magnetic resonance at different frequencies. The number of concentric ring resonator has created number of resonances. In this study, different analysis has been performed to verify distinct resonance frequencies, effective medium ratio and electromagnetic transmission properties simply by altering the design parameters. Computer Simulation Technology (CST) electromagnetic simulator which is commercially available is utilized to investigate the design of the metamaterial. The multiband response has been displayed of the metamaterial in conjunction with negative index material property over the certain span in the microwave regime. The proposed structure has become suitable for S-band, C-band, X-band and Ku-band applications and has achieved efficient electrically small microwave structure.

Bird Face Microstrip Printed Monopole Antenna Design for Ultra Wide Band Applications

Abstract In this paper, a novel bird face microstrip printed monopole ultra-wideband (UWB) antenna is investigated. The proposed compact antenna consists of a ring-shaped with additional slot and slotted ground plane on FR4 material. The overall electrical dimension of the proposed antenna is 0.25 λ×0.36 λ×0.016 λ and is energized by microstrip feed line. The Computer Simulation Technology (CST) and the High Frequency Structural Simulator (HFSS) is applied in this analysis. The impedance bandwidth of the monopole antenna cover 3.1–12.3 GHz (9.2 GHz, BW) frequency range. The messurement displayed that the designed antenna achieved excellent gain and stable omnidirectional radiation patterns within the UWB. The maximum gain of 6.8 dBi and omnidirectional radiation pattern makes the proposed antenna that is suitable for UWB systems.