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

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.

Backward-Wave Property in Left-Handed Materials

2014 ◽  
Vol 893 ◽  
pp. 760-764
Author(s):  
Hui Li ◽  
Wen Tao Xia ◽  
Shi Quan Zhang
Keyword(s):  
Microstrip Antenna ◽  
Double Negative ◽  
The Novel ◽  
Left Handed ◽  
Permittivity And Permeability ◽  
Wave Property ◽  
Backward Wave ◽  
Formula Derivation ◽  
Rectangular Microstrip Antenna ◽  
Coaxial Feed

In this paper, we present the backward-wave property in left-handed materials (LHM), where the permittivity and permeability are simultaneously less than zero. This property is theoretical proved by formula derivation. Then we presented a novel T-type structure LHM and its double negative property and backward-wave property are verified. We get the novel LHM and a coaxial feed rectangular microstrip antenna together and achieve the effect of backward-wave property on antenna by simulation. The results indicate that by using the LHM, the length of antenna could shorten.

Dual-layered polarization and frequency reconfigurable microstrip antenna by rotating breach-truncated circular radiator

2017 ◽  
Vol 9 (8) ◽  
pp. 1705-1712
Author(s):  
Haixiong Li ◽  
Yunlong Gong ◽  
Jiakai Zhang ◽  
Jun Ding ◽  
Chenjiang Guo
Keyword(s):  
Reflection Coefficient ◽  
Circular Polarization ◽  
Microstrip Antenna ◽  
Axial Ratio ◽  
Axial Rotation ◽  
Polarization Characteristic ◽  
The Novel ◽  
Test Results ◽  
Left Handed ◽  
Mechanical Rotation

In this study, a dual-layered polarization and frequency reconfigurable microstrip antenna is proposed based on sequential mechanical axial rotation of the circular metal radiator. The antenna can be reconfigured among three different polarized modes, including the linear polarization (LP), left-handed circular polarization and right-handed circular polarization in the band from 4.68 to 4.80 GHz (2.53%). The resonance frequency of the proposed antenna with the same LP mode could also be tuned in the range from 4.70 to 5.03 GHz by mechanical rotation of the breach-truncated circular metal radiator as well as the circular substrate. Furthermore, the polarization characteristic and frequency can be reconfigured, respectively, as the circular radiator is taken an axial rotation with an angle of 360°. The presented antenna in the four different states has been numerically simulated and fabricated for the experimental measurement, the investigated characteristics includes the port reflection coefficient, axial ratio, radiation pattern, gain, and the radiation efficiency. The simulated and test results agreed well with each other. This antenna enriches the novel mechanical reconfigurable method except for the popular electrical approach.

Improved analysis method for broadband rectangular microstrip antenna geometry using E-plane gap coupling

1993 ◽  
Vol 29 (22) ◽  
pp. 1907 ◽  
Author(s):  
Y.K. Cho ◽  
G.H. Son ◽  
G.S. Chae ◽  
L.H. Yun ◽  
J.P. Hong
Keyword(s):  
Microstrip Antenna ◽  
Analysis Method ◽  
Rectangular Microstrip Antenna ◽  
Gap Coupling
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