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.

scholarly journals A Compact Wideband Stacked Antenna for the Tri-Band GPS Applications

2008 ◽  
Vol 2008 ◽  
pp. 1-4 ◽  
Author(s):  
Maher M. Abd Elrazzak ◽  
M. F. Alsharekh
Keyword(s):  
Finite Difference ◽  
Time Domain ◽  
Patch Antenna ◽  
Finite Difference Time Domain ◽  
Dielectric Materials ◽  
Scattering Parameters ◽  
High Permittivity ◽  
Perfect Matched Layer ◽  
Difference Time ◽  
Stacked Patch Antenna

A compact wideband stacked patch antenna is presented for the applications of GPS systems. This antenna covers the L1, L2, and L5 GPS bands of operating frequencies 1.575, 1.227, and 1.176 GHz, respectively. High permittivity dielectric materials are used to minimize the antenna dimensions. The obtained antenna is of dimensions  mm. To verify the design, the time dependence field distribution, the scattering parameters, and the radiation pattern are presented. The scattering parameters show that the antenna operates at the GPS frequencies with lower than  dB. The finite difference time domain (FDTM) with the perfect matched layer (PML) is used in the present analysis.

Design of narrow band multi-channel optical filters using zero index medium

2018 ◽  
Vol 32 (15) ◽  
pp. 1850188
Author(s):  
N. P. Anusha ◽  
Alok Sharan
Keyword(s):  
Finite Difference ◽  
Optical Thickness ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Narrow Band ◽  
Optical Filter ◽  
Optical Filters ◽  
Difference Time ◽  
Zero Index ◽  
Negative Medium

We propose a design of narrow-band multi-channel optical filter using multiple stacks of unit cell consisting of trilayer of Doubly positive medium (DPS)–Doubly negative medium (DNG)–Epsilon negative medium (ENG). Finite Difference Time Domain (FDTD) technique is used to numerically simulate the effect of optical thickness of DPS, DNG and ENG media on tunability of the transmission spectrum of such a medium. We also demonstrate the control on the number of channels at different frequencies that can be transmitted through such medium.

Sign in / Sign up

Export Citation Format

Share Document