scholarly journals Soft surfaces and enhanced nonlinearity enabled via epsilon-near-zero media doped with zero-area perfect electric conductor inclusions

2020 ◽  
Vol 45 (16) ◽  
pp. 4591
Author(s):  
Ehsan Nahvi ◽  
Iñigo Liberal ◽  
Nader Engheta
Keyword(s):  
Perfect Electric Conductor ◽  
Electric Conductor ◽  
Epsilon Near Zero

scholarly journals SAR Reduction Using Integration of PIFA and AMC Structure for Pentaband Mobile Terminals

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Jae-Gon Lee ◽  
Jeong-Hae Lee
Keyword(s):  
Absorption Rate ◽  
Specific Absorption Rate ◽  
Dielectric Film ◽  
Perfect Electric Conductor ◽  
Mobile Terminals ◽  
Magnetic Conductor ◽  
Spreading Effect ◽  
Electric Conductor ◽  
Em Field ◽  
High Band

In this paper, a capacitive grating artificial magnetic conductor (AMC) is presented to reduce the specific absorption rate (SAR) in pentaband mobile terminals. The AMC structure is implemented using a dielectric film with the printed arrays of the metal strips placed at the top and the bottom of the dielectric. It is difficult to design the AMC structure to operate at low (824~960 MHz) and high bands (1710~2170 MHz) simultaneously, because of the limited space available for the antenna. Hence, we have designed the capacitive grating AMC to operate at a high band. Then, we attached a PIFA to the AMC structure to cover low and high bands. As the AMC structure is operated as a perfect electric conductor (PEC) in low band, the radiating branches of the PIFA for the low and high bands should be located on the non-AMC and the AMC structures, respectively. Even though the AMC structure is operated at a high band, the effect against the head could be reduced in the pentaband due to the spreading effect of the electromagnetic (EM) field at lower bands. From measured results, the 1 g SAR in the case of the AMC antenna is significantly lower than that in the case where only the PIFA is present in the pentaband.

scholarly journals Electrostatic theory of rectangular waveguides filled with anisotropic media

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Afshin Moradi
Keyword(s):  
Electrostatic Field ◽  
Perfect Electric Conductor ◽  
Electric Conductor ◽  
Hyperbolic Metamaterials ◽  
Cutoff Frequencies ◽  
Rectangular Waveguides ◽  
Waves Propagation ◽  
And Storage ◽  
Group Velocities ◽  
Electrostatic Theory

AbstractThe electrostatic (or, in a better word, quasi-electrostatic) theory of waves propagation in a long, rectangular waveguide having perfect electric conductor walls that filled with an anisotropic medium (here, a medium of nanowire-based hyperbolic metamaterials) is presented. Some data on characteristics of these waves are prepared. The presented results include electrostatic field configurations (modes) that can be supported by such structures and their corresponding cutoff frequencies, group velocities, power flows and storage energies.

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