Of dipole antennas in a magnetized plasma in the resonance frequency band

2011 ◽  
Vol 54 (7) ◽  
pp. 463-473 ◽  
Author(s):  
E. A. Shirokov ◽  
Yu. V. Chugunov
Keyword(s):  
Resonance Frequency ◽  
Frequency Band ◽  
Magnetized Plasma ◽  
Dipole Antennas

Investigation of e-textile dipole antenna performance based on embroidery parameters

2021 ◽  
pp. 004051752110134
Author(s):  
Daniel Agu ◽  
Rachel J Eike ◽  
Allyson Cliett ◽  
Dawn Michaelson ◽  
Rinn Cloud ◽  
...  
Keyword(s):  
Frequency Band ◽  
Impedance Matching ◽  
Dipole Antenna ◽  
Water Soluble ◽  
Wearable Sensor ◽  
Dipole Antennas ◽  
Antenna Performance ◽  
Large Production ◽  
Lower Transmission ◽  
The Ideal

E-textile antennas have the potential to be the premier on-body wearable sensor. Embroidery techniques, which can be applied to produce e-textile antennas, assist in large production volumes and fast production speeds. This paper focuses on the effects of three commonly used embroidery parameters, namely stitch type, conductive thread location, and stabilizer, on the performance of embroidered dipole antennas in order to determine the ideal embroidery combination for optimal antenna performance. Fifty-four dipole antenna samples were fabricated and measured at the industrial, scientific, and medical (ISM) frequency band of 2.45 GHz. The results of this study show that machine-embroidered antenna designs with satin stitches resonate at a lower frequency and exhibit a lower transmission gain compared with those made with contour stiches, and the conductive thread location in the bobbin location plus the use of a water-soluble stabilizer can help improve impedance matching.

Square-shaped metal screens in the infrared to terahertz spectral region: Resonance frequency, band gap, and bandpass filter characteristics

2008 ◽  
Vol 104 (2) ◽  
pp. 023103 ◽  
Author(s):  
O. Sternberg ◽  
K. P. Stewart ◽  
Y. Hor ◽  
A. Bandyopadhyay ◽  
J. F. Federici ◽  
...  
Keyword(s):  
Resonance Frequency ◽  
Band Gap ◽  
Frequency Band ◽  
Spectral Region ◽  
Bandpass Filter

scholarly journals A Dual-Wideband Double-Layer Magnetoelectric Dipole Antenna with a Modified Horned Reflector for 2G/3G/LTE Applications

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Botao Feng ◽  
Weijun Hong ◽  
Shufang Li ◽  
Wenxing An ◽  
Sixing Yin
Keyword(s):  
Double Layer ◽  
Frequency Band ◽  
Lower Layer ◽  
Low Cost ◽  
Impedance Matching ◽  
Ground Plane ◽  
Dipole Antenna ◽  
Dipole Antennas ◽  
Dipole Structure ◽  
Feeding Structure

A novel dual-wideband double-layer magnetoelectric dipole unidirectional antenna with a modified horned reflector for 2G/3G/LTE applications is proposed. Firstly, a double-layer electric dipole structure is presented to provide a dualwideband, whose folded lower layer mainly serves the lower frequency band while the inclined upper layer works for the upper frequency band. In addition, to reduce the size of the antenna and improve impedance matching, a new feeding structure designed with inverted U-shaped and tapered line is introduced. Finally, a modified horn-shaped reflector, instead of a ground plane, is employed to achieve stable and high gains. The antenna prototype can achieve a bandwidth of 24.4% (790 MHz–1010 MHz) with a stable gain of 7.2 ± 0.6 dBi for the lower band, and a bandwidth of 67.3% (1.38 GHz–2.78 GHz) with a gain of 7.5 ± 0.8 dBi for the upper band covering all the frequency bands for 2G/3G/LTE systems. To the best of our knowledge, it is the first double-layer magnetoelectric dipole antenna proposed. Compared with the existing ME dipole antennas, the proposed antenna, which is completely made of copper, can be easily fabricated at low cost and thus is practicable for 2G/3G/LTE applications.

scholarly journals ON THE POSSIBILITIES OF PERMITTIVITY CALCULATION IN A CERTAIN BANDWIDTH FROM SINGLE FREQUENCY RESULTS

2019 ◽  
Author(s):  
Antonio José Lozano-Guerrero ◽  
Juan Monzó-Cabrera ◽  
Alejandro Díaz-Morcillo
Keyword(s):  
Resonance Frequency ◽  
Frequency Band ◽  
Debye Model ◽  
Single Frequency ◽  
Distilled Water ◽  
Frequency Bandwidth ◽  
Polar Liquids

The permittivity of a material can be obtained from resonant measurements in an accurate way [1] at a single frequency (where the resonance occurs). In figure (1) results for the Debye Model at 298K temperature can be seen in the 10MHz-50GHz frequency band for distilled water. In this work we explore the possibilities of obtaining the permittivity of materials from resonant measurements in a certain frequency bandwidth around the resonance frequency. With this purpose a Debye model jointly with a certain conductivity useful for polar liquids [1], are studied to evaluate this possibility jointly with inverse techniques.  

LEFT-HANDNESS IN A FOUR-LEVEL ATOMIC SYSTEM

2009 ◽  
Vol 07 (04) ◽  
pp. 747-754 ◽  
Author(s):  
SHUNCAI ZHAO ◽  
ZHENGDONG LIU
Keyword(s):  
Resonance Frequency ◽  
Frequency Band ◽  
Quantum Coherence ◽  
Atomic System ◽  
Negative Permittivity ◽  
Negative Permeability ◽  
Potential Applications

A scheme is proposed for realizing simultaneous negative permittivity and negative permeability based on quantum coherence in a four-level dense atomic system here. Under some parametric conditions the system shows that simultaneous negative permittivity and negative permeability (i.e. Left-handness) can be achieved in a wider frequency band because of quantum coherence. And the novelty properties of gain and dispersion near the resonance frequency may have some potential applications.

Dipole antennas surrounded with magnetized plasma shells

2005 ◽  
Author(s):  
A.V. Kostrov ◽  
A.I. Smirnov ◽  
M.V. Starodoubtsev ◽  
A.A. Shaykin
Keyword(s):  
Magnetized Plasma ◽  
Dipole Antennas

scholarly journals Damage detection in sluice hoist beams subject to excitation at resonance frequency band based on local primary frequency

2019 ◽  
Vol 28 ◽  
pp. 40-45
Author(s):  
M. S. Cao ◽  
Q. Y. Wei ◽  
W. Xu ◽  
D. Novák ◽  
R. Pukl ◽  
...  
Keyword(s):  
Damage Detection ◽  
Resonance Frequency ◽  
Frequency Band ◽  
At Resonance ◽  
Primary Frequency

Single / Dual-Band Frequency and Polarization Switching Using Frequency Selective Surfaces for Terahertz Applications

2021 ◽  
Author(s):  
Ahmed Mosaad Mabrouk ◽  
Ahmed Abd Elmoneam Ibrahim ◽  
Hesham Fathi Hamed
Keyword(s):  
Frequency Band ◽  
Unit Cell ◽  
Dual Band ◽  
Frequency Selective Surfaces ◽  
Polarization Conversion ◽  
Dipole Antennas ◽  
Band Frequency ◽  
Terahertz Band ◽  
Cell Element ◽  
Terahertz Applications

Abstract This paper presents reconfigurable frequency and polarization FSS-based with photoconductive switches in a single and dual-band operation for antenna applications at the terahertz band. The single band FSS unit-cell element exhibits frequency reconfigurability between 0.62 THz and 0.7 THz. It also converts the LP waves into CP over a frequency band ranging from 0.59 THz to 0.8 THz (30 % 3-dB BW). The dual-band FSS unit-cell element exhibits frequency reconfigurability between (0.42 THz and 1.03 THz) when the switches are turned ON and (0.51 THz and 0.865 THz) when the switches are turned OFF. Moreover, it exhibits polarization conversion over two bands from 0.46 THz to 0.56 THz (20% 3-dB B.W) and from 0.82 THz to 0.91 THz (12 % 3-dB B.W). The dual-band FSS unit-cell element is arranged in a 7 x 7 array and used as a reflector for two dipole antennas (A and B) operating at 0.82 THz and 0.5 THz, respectively. The same dual-band FSS-based surface enhances their gain to about 8.4 dBi and converts their polarization from LP to CP at 0.82 THz and 0.5 THz, respectively.

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