A metamaterial based dual-resonant coil element for combined sodium/hydrogen MRI at 7 Tesla

2017 ◽  
Vol 84 (1) ◽  
Author(s):  
Jan Taro Svejda ◽  
Andreas Rennings ◽  
Daniel Erni
Keyword(s):  
Transmission Line ◽  
Coil Element ◽  
Left Handed ◽  
Field Distributions ◽  
Sodium Hydrogen ◽  
Quarter Wavelength ◽  
Single Coil ◽  
Em Field

AbstractA single coil element based on a composite right/left-handed (CRLH) metamaterial transmission line for combined sodium and hydrogen MRI is presented. It provides the particular feature of equal quarter-wavelength current and electromagnetic (EM) field distributions at the two distinct Larmor frequencies of

Design and Analysis of a New ZOR Antenna with Wide Half Power Beam Width (HPBW) Characteristic

Frequenz ◽  
2017 ◽  
Vol 71 (1-2) ◽  
pp. 41-50 ◽  
Author(s):  
Lin Peng ◽  
Ji-yang Xie ◽  
Xing Jiang ◽  
Cheng-li Ruan
Keyword(s):  
Boundary Conditions ◽  
Transmission Line ◽  
Beam Width ◽  
Unique Characteristic ◽  
Radiation Patterns ◽  
Zeroth Order ◽  
Left Handed ◽  
Field Distributions ◽  
Half Power

Abstract Novel zeroth-order resonator (ZOR) composites epsilon-zero resonance (EZR) and mu-zero resonance (MZR) characteristics was proposed. The proposed resonator was constructed by moving via from centre of the conventional mushroom structure (CMS) to the edge, then, an edge-located via mushroom structure (ELV-MS) was formed. Thus, boundary conditions were transformed from all open-ended to half short-ended and half open-ended. Then, the new ZOR composites EZR and MZR characteristics (called EZR-MZR resonator). Owing to the unique characteristic of the composite EZR and MZR, the proposed ZOR antenna radiates both horizontal-polarized field (uni-directional) and vertical-polarized field (omni-directional). Then, wide half power beam width (HPBW) radiation patterns were realized for the antenna. The deduction and analysis of the proposed EZR-MZR resonator were conducted based on the composite right/left-handed transmission line (CRLH TL) and ZOR theories, and field distributions. The proposed ZOR antenna was investigated with two cases of coupling feeding.

Composite right/left-handed transmission line with array of thermocouples for generating terahertz radiation

2020 ◽  
Vol 92 (2) ◽  
pp. 20502
Author(s):  
Behrokh Beiranvand ◽  
Alexander S. Sobolev ◽  
Anton V. Kudryashov
Keyword(s):  
Transmission Line ◽  
Terahertz Radiation ◽  
Transmission Lines ◽  
Software Package ◽  
Optical Pulses ◽  
Capacitively Coupled ◽  
Voltage Difference ◽  
Left Handed ◽  
Microwave Transmission ◽  
Commercial Software Package

We present a new concept of the thermoelectric structure that generates microwave and terahertz signals when illuminated by femtosecond optical pulses. The structure consists of a series array of capacitively coupled thermocouples. The array acts as a hybrid type microwave transmission line with anomalous dispersion and phase velocity higher than the velocity of light. This allows for adding up the responces from all the thermocouples in phase. The array is easily integrable with microstrip transmission lines. Dispersion curves obtained from both the lumped network scheme and numerical simulations are presented. The connection of the thermocouples is a composite right/left-handed transmission line, which can receive terahertz radiation from the transmission line ports. The radiation of the photon to the surface of the thermocouple structure causes a voltage difference with the bandwidth of terahertz. We examined a lossy composite right/left-handed transmission line to extract the circuit elements. The calculated properties of the design are extracted by employing commercial software package CST STUDIO SUITE.

A Multilayer Compact Solid State Composite Right/Left-Handed Metamaterial Transmission Line

2008 ◽  
Vol 29 (12) ◽  
pp. 1383-1385 ◽  
Author(s):  
Zhirun Hu ◽  
Philip D. Curtis ◽  
Wei Tong
Keyword(s):  
Solid State ◽  
Transmission Line ◽  
Left Handed
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