Effect of Rectangular Microstrip Antenna with Cross Metal Patches Based on Near-Zero-Index

2014 ◽  
Vol 602-605 ◽  
pp. 2811-2815
Author(s):  
Yan Rong Zhang ◽  
Ji Jun Wang ◽  
Zhi Pan Zhu ◽  
Lei Lei Gong
Keyword(s):  
Finite Difference Time Domain ◽  
Microstrip Antenna ◽  
Fdtd Method ◽  
Index Of Refraction ◽  
Antenna Effect ◽  
Left Handed ◽  
Simulation Results ◽  
Rectangular Microstrip Antenna ◽  
Difference Time ◽  
Zero Index

In this paper, cross metal patches are inserted inside the conventional rectangular microstrip antenna, and thus it can work at two frequencies. The finite difference time domain (FDTD) method is selected to study effect of this left-handed metamaterial with near-zero-index of refraction. Compared with conventional rectangular microstrip antenna, effect of near-zero-index from positive and negative on conventional rectangular microstrip antenna are studied. Simulation results show this antenna works at two frequencies. Compared with conventional microstrip antenna, near-zero-index can improve antenna’s gain obviously.

scholarly journals New Design of Cylindrical Rectangular Microstrip Antenna (CRMA) By Using The Slots Technique

2020 ◽  
Vol 12 (01) ◽  
pp. 1-8
Author(s):  
Nabeel A. Areebi ◽  
◽  
Zeki A. Ahmed ◽  
Mahmoud M. Aubais ◽  
◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Microstrip Antenna ◽  
Return Loss ◽  
Fdtd Method ◽  
Conformal Antennas ◽  
Matlab Program ◽  
Rectangular Microstrip Antenna ◽  
Difference Time

A conformal antennas are plays an important role due to its multitasking possibilities , which have many opportunities in several applications. In this study, a new design of cylindrical rectangular microstrip antenna(CRMA ) excited at 〖TM〗_01 mode, was achieved in order to operate at the frequency of 5.6GHz. The simulation was done by Finite Difference Time Domain(FDTD) method using MATLAB program. The input impedance , return loss and radiation pattern of antenna were calculated and plotted. By using the slots technique and dual-layers substrate technique , the bandwidth(BW) is increased to 88.88% . Also BW is increased as the dielectric constant value is decreased.

scholarly journals Study on a Composite Patch Antenna Based on Left Handed Material with Near Zero Index

2014 ◽  
Vol 18 (2) ◽  
pp. 70
Author(s):  
Jijun Wang ◽  
Zhipan Zhu ◽  
Yanrong Zhang ◽  
Leilei Gong ◽  
Yuntuan Fang
Keyword(s):  
Finite Difference ◽  
Time Domain ◽  
Patch Antenna ◽  
Finite Difference Time Domain ◽  
Return Loss ◽  
Antenna System ◽  
Composite Patch ◽  
Left Handed ◽  
Difference Time ◽  
Zero Index

In this paper, a composite patch antenna based on lefthanded material (LHM) with near zero index (NZI) is presented.This composite patch antenna is designed by assembling splitresonant rings (SRRs) and metal strips on the substrates. Thismultilayer composite structure results in a metamaterial with NZInear 13.89 GHz. A method of finite difference time domain(FDTD) is used. The results show that the composite antenna’sgain improves 0.61 times, and its bandwidth adds 2.95 timescompared to the conventional antenna’s ones. The results indicatethat this composite patch antenna system can reduce return loss ofthe antenna and increase the gain obviously.

Time-domain analysis of a CRLH coupled-line coupler using the CN-FDTD method

2018 ◽  
Vol 11 (1) ◽  
pp. 94-103 ◽  
Author(s):  
Mahdieh Gholami Mayani ◽  
Shahrooz Asadi ◽  
Shokrollah Karimian
Keyword(s):  
Time Domain ◽  
Finite Difference Time Domain ◽  
Fdtd Method ◽  
Time Domain Analysis ◽  
Step Size ◽  
Dramatic Decrease ◽  
Coupled Line ◽  
Left Handed ◽  
Difference Time ◽  
Good Agreement

In this study, the implicit Crank–Nicolson finite-difference time-domain (CN-FDTD) method is applied to discretize the governing telegrapher's equations of a composite right-/left-handed (CRLH) coupled-line coupler. The unconditionally stable CN-FDTD is compared with the conventional leap-frog (LF) FDTD method. The results obtained from the CN-FDTD scheme show up to 10 times increase in the temporal step size, reflecting in a dramatic decrease in processing time; in addition to having a good agreement with the LF method and the measurements.

Effect of spiral left-handed material with near-zero index on rectangular microstrip antenna

2014 ◽  
Vol 169 (9) ◽  
pp. 808-815
Author(s):  
Yan-Rong Zhang ◽  
Ji-Jun Wang ◽  
Lei-Lei Gong ◽  
Zhi-Pan Zhu
Keyword(s):  
Microstrip Antenna ◽  
Left Handed ◽  
Rectangular Microstrip Antenna ◽  
Zero Index

FDTD Modelling of Triangular Gold Nanoparticle Pairs

2014 ◽  
Vol 703 ◽  
pp. 220-223
Author(s):  
Yang Fan
Keyword(s):  
Electric Field ◽  
Gold Nanoparticle ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Fdtd Method ◽  
Field Enhancement ◽  
Electric Field Enhancement ◽  
Plasmon Resonances ◽  
Simulation Results ◽  
Difference Time

The optical properties of triangular gold nanoparticle pairs are investigated by numerical simulations using Finite-difference time-domain (FDTD) method. The simulation results show the significant red shifts of plasmon resonances as the size of nanoparticle is increased. The large electric field enhancement is also verified by calculating the local electric field distributions.

SEPARATION OF RESONANCE MODES IN NANORING RESONATOR BY A CASCADED SLOT CAVITY

2012 ◽  
Vol 26 (23) ◽  
pp. 1250150 ◽  
Author(s):  
KEFENG SHANG ◽  
LIANSHAN YAN ◽  
KUNHUA WEN ◽  
ZHEN GUO ◽  
YINGHUI GUO ◽  
...  
Keyword(s):  
Finite Difference Time Domain ◽  
Single Channel ◽  
Free Spectral Range ◽  
Fdtd Method ◽  
Resonance Modes ◽  
Mode Separation ◽  
Slot Cavity ◽  
Simulation Results ◽  
Difference Time ◽  
Channel Filter

A mode separation approach in the nanoring resonator by a cascaded slot cavity is proposed and numerically investigated using the finite-difference time-domain (FDTD) method. With the cascaded slot cavity, the specified modes in the nanoring can be separated to realize a wide free spectral range (FSR) or single channel filtering, which provides a free degree to the plasmonic filters design. Simulation results also demonstrate that the full-width at half-maximum (FWHM) of the single channel filter obtained from the cascaded slot cavity can be effectively reduced to meet various requirements.

ENHANCED TRANSMITTANCE AND RESOLUTION OF PHOTONIC CRYSTAL FLAT LENS BY SURFACE-EDGE ENGINEERING

2012 ◽  
Vol 26 (18) ◽  
pp. 1250113
Author(s):  
HAO GUO ◽  
CANCAN WANG ◽  
PEIYUAN ZHANG ◽  
HONGJUN CHEN ◽  
YUN LI ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Cross Section ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Fdtd Method ◽  
Flat Lens ◽  
Simulation Results ◽  
Difference Time ◽  
Reflection Grating ◽  
Method Show

We proposed a novel two-dimensional (2D) photonic crystal (PC) flat lens based on the surface-edge engineering of a PC slab, operating as an n = -1 superlens at λ = 1.55 μm. The cross-section at the truncated edge of the flat lens is similar to an "anti-reflection grating", which is employed to reduce the reflectivity of propagative waves. The PC flat lens with a low reflectance of 1% was realized by the proposed truncated surface-edge for an InP / InGaAsP / InP 2D PC slab. The simulation results obtained with finite-difference time-domain (FDTD) method show that a PC flat super lens with a far-field resolution of 0.41 λ and a high transmittance of 81.9% can be achieved by the engineering of the truncated surface-edge at hetero-interface.

Design and Analysis of 2D Photonic Crystal Waveguides for High Coupling Efficiency

2007 ◽  
Vol 31 ◽  
pp. 27-29
Author(s):  
Ming Wu ◽  
Hai Rong Liu ◽  
Wei Jun Tong ◽  
De Xiu Huang
Keyword(s):  
Photonic Crystal ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Dielectric Waveguide ◽  
Fdtd Method ◽  
Coupling Efficiency ◽  
Photonic Crystal Waveguide ◽  
Photonic Crystal Waveguides ◽  
Simulation Results ◽  
Difference Time

In this paper we have proposed a photonic crystal structure to enhance the coupling efficiency between photonic crystal waveguide (PCW) and the conventional dielectric waveguide. The proposed waveguide characterized with employing the taper structure and varying the holes’ radius in the taper. Two-dimensional (2D) finite-difference time-domain (FDTD) method has been used to analyze the structure. The simulation results show that the coupling efficiency can be achieved as high as 81.6% at the wavelength of 1.55um.

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