scholarly journals Potential Use of Cold Plasma Discharges for Frequency Reconfigurability in a Sievenpiper Mushroom Metasurface

2021 ◽  
Vol 11 (23) ◽  
pp. 11342
Author(s):  
Francisco Pizarro ◽  
Pablo Stuardo ◽  
Ricardo Olivares ◽  
Eva Rajo-Iglesias
Keyword(s):  
Parametric Study ◽  
Cold Plasma ◽  
Collision Frequency ◽  
Plasma Frequency ◽  
Stop Band ◽  
Plasma Discharges ◽  
Electronic Density ◽  
Full Wave ◽  
Insertion Losses ◽  
Potential Use

This article presents a parametric study using full-wave simulations about the potential use of cold plasma discharges to achieve frequency reconfiguration on a Sievenpiper mushroom metasurface. The study was done by inserting plasma tubes in between the patches of the mushroom structure, in three different positions with respect to the top of the metasurface, and varying the electronic density while keeping the plasma collision frequency. The obtained results show that it is possible to shift the stop-band generated by the metasurface around 25% towards lower frequencies for an electron density value inside the tubes of 1014 cm−3, when they are placed in between the top patches of the metasurface. Additional insertion losses are exhibited when operating near the plasma frequency.

Reflexion levels and coupling regions in a horizontally stratified ionosphere

1959 ◽  
Vol 252 (1004) ◽  
pp. 53-68 ◽  
Keyword(s):  
Collision Frequency ◽  
Plasma Frequency ◽  
Wave Theory ◽  
Electron Collision ◽  
Ray Theory ◽  
Radio Waves ◽  
Quartic Equation ◽  
Full Wave ◽  
Electron Collision Frequency ◽  
Full Solution

The propagation of radio waves through a horizontally stratified and slowly varying ionosphere is governed, in the case of oblique incidence, by a quartic equation (Booker 1938). Ray theory breaks down when two roots of this quartic are equal, for then coupling occurs between the characteristic waves, and full wave theory must be used. This paper is concerned with determining the conditions under which the two roots are equal; it is not concerned with the full wave theory. Values of the plasma frequency, and electron collision frequency, which lead to equal roots, are determined, and are exhibited in a set of curves. A full solution of the ‘Booker’ quartic is also given for a case of special interest. It is pointed out that the electric wave-field is unlikely to become very large in a slowly varying ionosphere, so that, if the ionosphere were irregular, scattering cannot be unduly enhanced by a plasma resonance.

Parametric study of a cold plasma jet generated at atmospheric pressure

2013 ◽  
Vol 62 (3) ◽  
pp. 453-458
Author(s):  
Woo Seok Kang ◽  
Min Hur ◽  
Young-Hoon Song
Keyword(s):  
Parametric Study ◽  
Atmospheric Pressure ◽  
Cold Plasma ◽  
Plasma Jet

Grafting of Paper by Silane Coupling Agents Using Cold‐Plasma Discharges

2008 ◽  
Vol 5 (5) ◽  
pp. 444-452 ◽  
Author(s):  
Carla Gaiolas ◽  
Ana Paula Costa ◽  
Mario Nunes ◽  
Manuel José Santos Silva ◽  
Mohamed Naceur Belgacem
Keyword(s):  
Cold Plasma ◽  
Coupling Agents ◽  
Plasma Discharges ◽  
Silane Coupling Agents ◽  
Silane Coupling

Small amplitude transverse wave propagation in a weakly Langmuir turbulent plasma

1969 ◽  
Vol 3 (4) ◽  
pp. 593-601
Author(s):  
N. Bel ◽  
J. Heynaerts
Keyword(s):  
High Frequency ◽  
Small Amplitude ◽  
Cold Plasma ◽  
Plasma Frequency ◽  
Turbulent Plasma ◽  
Distribution Functions ◽  
Isotropic Plasma ◽  
Particle Correlation ◽  
Special Cases ◽  
Corrective Term

The high frequency conductivity tensor of an isotropic plasma is derived taking into account particle correlations at the lowest consistent order in the parameter ωp/ω these correlations describe a weakly Langmuir turbulent plasma. Two special cases are investigated in which the two-particle correlation function is related to the turbulent electrostatic field spectrum. Particular distribution functions and spectra are considered and approximate dispersion relations are derived in both cases in ‘the cold plasma limit’. The importance of the corrective term is discussed in terms of three dimensionless parameters measuring the strength of the turbulence, the shape of the spectrum, and the frequency. The effect could be important for frequencies not too far from the plasma frequency.

Three-Dimensional Full-Wave Propagation Code for Cold Plasma

2004 ◽  
Vol 46 (2) ◽  
pp. 342-347 ◽  
Author(s):  
Pavel Popovich ◽  
W. Anthony Cooper ◽  
Laurent Villard
Keyword(s):  
Wave Propagation ◽  
Cold Plasma ◽  
Three Dimensional ◽  
Full Wave

The theory of radio windows in planetary magnetospheres

1987 ◽  
Vol 412 (1842) ◽  
pp. 1-23 ◽  
Keyword(s):  
Plasma Wave ◽  
Electromagnetic Waves ◽  
Cold Plasma ◽  
Mode Conversion ◽  
Special Method ◽  
Concentration Gradients ◽  
Linear Mode ◽  
Full Wave ◽  
Warm Plasma ◽  
Partial Linear

The theory of radio windows given in two previous papers for a stratified cold plasma is extended to apply in a warm plasma. It is used to investigate one suggested mechanism for the production of non-thermal continuum radiation in magnetospheric cavities. The source is a plasma wave that enters a region where there is a gradient of electron concentration and there undergoes partial linear mode conversion to give ordinary and extraordinary electromagnetic waves and a reflected plasma wave. This theory is needed particularly for the plasmapause and magnetopause where the concentration gradients may be large. It is therefore necessary to use a full-wave integration of the governing differential equations. These are derived for a warm plasma. When they are integrated, the problem of numerical swamping is severe and is dealt with by a special method. Some typical results are presented and discussed.

A band notch UWB bandpass filter using dual-stub-loaded multimode resonator with embedded spiral resonator

2013 ◽  
Vol 6 (2) ◽  
pp. 161-166 ◽  
Author(s):  
Pankaj Sarkar ◽  
Ishita Rakshit ◽  
Sharmili Adhikari ◽  
Manimala Pal ◽  
Rowdra Ghatak
Keyword(s):  
Insertion Loss ◽  
Close Agreement ◽  
Bandpass Filter ◽  
Stop Band ◽  
Ultra Wideband ◽  
Band Edge ◽  
Electromagnetic Simulation ◽  
Transmission Zeros ◽  
Full Wave ◽  
Sharp Band

This paper presents a band-notched ultra-wideband bandpass filter by loading a short stub and an asymmetric step impedance stub in a uniform impedance resonator. The passband extends from 3.04 to 10.8 GHz frequency. The multimode resonator provides a sharp band edge with measured transmission zeros at 2.59 and 13 GHz. The later one is due to source load coupling. The passband insertion loss is within 1.5 dB. The embedded spiral resonator introduces a notch at 5.25 GHz with attenuation of 15 dB. The filter exhibits a wide stop band till 15 GHz. The in band and out of band performance obtained from full-wave electromagnetic simulation and measurement are in close agreement.

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