Free space measurement of the cross-polarized transmission band of a bianisotropic left-handed metamaterial

2008 ◽  
Vol 92 (17) ◽  
pp. 174103 ◽  
Author(s):  
Xiangxiang Cheng ◽  
Hongsheng Chen ◽  
Tao Jiang ◽  
Lixin Ran ◽  
Jin Au Kong
Keyword(s):  
Free Space ◽  
Transmission Band ◽  
Left Handed ◽  
The Cross ◽  
Space Measurement

scholarly journals Long-Distance Free-Space Measurement-Device-Independent Quantum Key Distribution

2020 ◽  
Vol 125 (26) ◽  
Author(s):  
Yuan Cao ◽  
Yu-Huai Li ◽  
Kui-Xing Yang ◽  
Yang-Fan Jiang ◽  
Shuang-Lin Li ◽  
...  
Keyword(s):  
Free Space ◽  
Quantum Key Distribution ◽  
Key Distribution ◽  
Long Distance ◽  
Measurement Device ◽  
Space Measurement ◽  
Measurement Device Independent

scholarly journals Balanced gain for a square metaloop antenna

2019 ◽  
Vol 6 ◽  
pp. 3
Author(s):  
Hisamatsu Nakano ◽  
Ittoku Yoshino ◽  
Tomoki Abe ◽  
Junji Yamauchi
Keyword(s):  
Frequency Response ◽  
Radiation Pattern ◽  
Free Space ◽  
Loop Antenna ◽  
Circularly Polarized ◽  
Left Handed ◽  
The Difference

A square loop antenna implemented using a metamaterial line, referred to as a metaloop, is discussed. The metaloop radiates a counter circularly polarized (CP) broadside beam when the loop circumference equals one guided wavelength. The frequency response of the gain shows two different maximum values: gain G Lmax for a left-handed CP wave at frequency fGLmax and gain GRmax for a right-handed CP wave at frequency fGRmax, where GLmax is smaller than GRmax. In order to increase GLmax, while not affecting the original GRmax as much as possible (i.e. balance the gain), a parasitic natural conducting loop (paraloop), whose circumference is one free-space wavelength at fGLmax, is placed at height Hpara above the metaloop. It is found that the difference in the gains can be reduced by choosing an appropriate Hpara. The radiation pattern at fGLmax is narrowed by the paraloop, while the VSWR is not remarkably affected.

Introducing the new wideband small plate antennas with engraved voids to form new geometries based on CRLH MTM-TLs for wireless applications

2014 ◽  
Vol 6 (6) ◽  
pp. 629-637 ◽  
Author(s):  
Mohammad Alibakhshi
Keyword(s):  
Transmission Line ◽  
Free Space ◽  
Model Parameters ◽  
Transmission Line Model ◽  
Physical Size ◽  
Wireless Applications ◽  
Small Antennas ◽  
Left Handed ◽  
Unit Cells ◽  
Operational Frequency

In this paper, four new wideband small antennas based on the composite right/left-handed transmission line (CRLH-TL) structures are designed, tooled, and made. The proposed antennas are introduced with best in size, bandwidth, and radiation patterns. The physical size and the operational frequency of the antennas depend on size of the unit cells and the equivalent transmission line model parameters of the CRLH-TLs, including series inductance, series capacitance, shunt inductance, and shunt capacitance. To define characteristics of the antennas, the engraved J- and I-formed voids on the radiation patches are used. The physical sizes of the CRLH antennas are 0.45λ0 × 0.175λ0 × 0.02λ0, 0.428λ0 × 0.179λ0 × 0.041λ0, 0. 564λ0 × 0.175λ0 × 0.02λ0, and 0.556λ0 × 0.179λ0 × 0.041λ0 in terms of free-space wavelengths at the 7.5, 7.7, 7.5, and 7.7 GHz, respectively. These metamaterial antennas can be used for frequency bands from 7.5–16.8 GHz, 7.7–18.6 GHz, 7.25–17.8 GHz, and 7.8–19.85 GHz for VSWR < 2, which correspond to 74.4, 82.88, 84.23, and 87.16% practical bandwidths, respectively. Also, the ranges of the measured gains and radiation efficiencies of the recommended antennas are 0.1 dBi < G < 2.1 dBi and 20% < eff < 44.3%, and 0.8 dBi < G < 2.35 dBi and 23% < eff < 48.2%, for J-shaped antennas, whereas 0.1.15 dBi < G < 3.11 dBi and 30.24% < eff < 58.6%, and 1.2 dBi < G < 3.4 dBi and 32.4% < eff < 68.1% for I-shaped antennas, respectively.

Left-Handed Theology and Inclusiveness

Horizons ◽  
1990 ◽  
Vol 17 (2) ◽  
pp. 207-216
Author(s):  
Gordon Jensen
Keyword(s):  
Theology Of The Cross ◽  
Left Hand ◽  
Left Handedness ◽  
Left Handed ◽  
Right Hand ◽  
The Cross ◽  
The Right

AbstractIn the concern for inclusiveness, one area that has been largely neglected is the discrimination against left-handedness. This paper looks briefly at some of the scriptural and social stigmas and implications attached to left-handedness. Using Luther's theology of the cross as its basis, a left-handed theology is introduced. Arguing for the need for a theology which focuses on those who are marginalized, a left-handed theology offers a model whereby God's left hand offers to those who are in “minority” positions grace and solidarity. This is contrasted to the right hand of God, which portrays a God of power, strength, and triumphalism. The hand of God which one chooses to relate to determines, then, how one does theology, and how a theological inclusiveness is developed.

Free-space focused-beam characterization of left-handed materials

2003 ◽  
Vol 82 (15) ◽  
pp. 2535-2537 ◽  
Author(s):  
Kin Li ◽  
S. J. McLean ◽  
R. B. Greegor ◽  
C. G. Parazzoli ◽  
M. H. Tanielian
Keyword(s):  
Free Space ◽  
Left Handed ◽  
Beam Characterization ◽  
Focused Beam
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