High-power reflection coefficient measurement of biological material applicable to microwave hyperthermia

2009 ◽  
Author(s):  
Namgon Kim ◽  
Jeonghoon Yoon ◽  
Changyul Cheon ◽  
Youngwoo Kwon
Keyword(s):  
Reflection Coefficient ◽  
High Power ◽  
Biological Material ◽  
Power Reflection Coefficient ◽  
Coefficient Measurement ◽  
Microwave Hyperthermia

The method of determining the metrological performance of unit reference standards of reflection coefficient in waveguides at millimeter waves

2020 ◽  
pp. 59-63
Author(s):  
A.S. Bondarenko ◽  
A.S. Borovkov ◽  
I.M. Malay ◽  
V.A. Semyonov
Keyword(s):  
Reflection Coefficient ◽  
Millimeter Waves ◽  
Primary Standard ◽  
Reference Standards ◽  
Measurement Scale ◽  
Current State ◽  
Coefficient Measurement ◽  
Mathematical Equations ◽  
Electrodynamic Modeling ◽  
Metrological Performance

The analysis of the current state of the reflection coefficient measurements in waveguides at millimeter waves is carried out. An approach for solving the problem of reproducing the reflection coefficient measurement scale is proposed. Mathematical equations, which are the basis of the reflection coefficient measurement equation are obtained. The method of determining the metrological performance of reflection coefficient unit’s reference standards is developed. The results of electrodynamic modeling and analytical calculations by the developed method are compared. It is shown that this method can be used for reproducing the reflection coefficient unit in the development of the State primary standard.

Corner reflector in a stripline in reflection-coefficient measurement

1991 ◽  
Vol 34 (12) ◽  
pp. 1245-1248
Author(s):  
G. A. Vedyushkin ◽  
M. G. Chernyshov
Keyword(s):  
Reflection Coefficient ◽  
Corner Reflector ◽  
Coefficient Measurement

Reflection Coefficient Measurement through the Implementation of Wideband Multi-Port Reflectometer with Error Correction for Microwave Imaging Application of Human Head

2013 ◽  
Vol 64 (3) ◽  
Author(s):  
Rashidah Che Yob ◽  
Norhudah Seman
Keyword(s):  
Reflection Coefficient ◽  
Error Correction ◽  
Human Head ◽  
Correction Method ◽  
Microwave Imaging ◽  
Passive Components ◽  
Power Dividers ◽  
Imaging Application ◽  
Coefficient Measurement ◽  
Design Systems

This article presents the reflection coefficient measurement by using a wideband multi-port reflectometer for microwave imaging application of human head. The configuration of the proposed wideband multi-port reflectometer is formed by passive components, which are four couplers and two power dividers operating from 1 to 6 GHz. The investigation is successfully done through simulation using the Agilent’s Advanced Design Systems (ADS) software and practical measurement in laboratory. An error correction method with three standards of match, open and short load is then applied to the constructed wideband multi-port reflectometer to remove its imperfect characteristics. The wideband characteristics of proposed reflectometer are analyzed and verified across the designated frequency band.  Its operation in reflection coefficient is tested with the chosen device under test (DUT).

Scattering of a Love Wave by the Edge of a Thin Surface Layer

1975 ◽  
Vol 42 (4) ◽  
pp. 842-846 ◽  
Author(s):  
D. A. Simons
Keyword(s):  
Boundary Condition ◽  
Surface Layer ◽  
Reflection Coefficient ◽  
Scattered Field ◽  
Love Wave ◽  
Thin Surface Layer ◽  
Antiplane Strain ◽  
Power Flux ◽  
Power Reflection Coefficient

The antiplane strain problem of the scattering of an incident Love wave by the edge of a thin surface layer is solved. The effect of the layer is represented by a boundary condition applied at the surface of the substrate. In addition, the condition of vanishing traction on the edge of the layer is explicitly enforced. At large distances from the layer’s edge the scattered field is found to consist of a reflected Love wave and a radiated wave. The power flux identity for the problem is derived, and values of the power reflection coefficient are computed. The power flux identity is verified numerically, and the discrepancy which would arise from a failure to satisfy the condition of vanishing traction on the layer’s edge is evaluated.

scholarly journals A Reconfigurable Graphene Nanoantenna on Quartz Substrate

2020 ◽  
Vol 19 (5) ◽  
pp. 379-383
Author(s):  
Yanghua Gao ◽  
Weidong Lou ◽  
Hailiang Lu
Keyword(s):  
Reflection Coefficient ◽  
Radiation Pattern ◽  
High Power ◽  
Quartz Substrate ◽  
Miniaturized Antenna ◽  
Thz Applications ◽  
Scattering Losses ◽  
Dynamic Frequency ◽  
Operation Frequency ◽  
Thz Antennas

In the terahertz (THz) band, conventional metallic antennas are virtually infeasible, due to the low mobility of electrons and huge attenuation. The existing metallic THz antennas need a high power to overcome scattering losses, and tend to have a low antenna efficiency. Fortunately, graphene is an excellent choice of miniaturized antenna in millimeter/THz applications, thanks to its unique electronic properties in THz band. Therefore, this paper presents two miniaturized reconfigurable graphene antennas, and characterizes their performance in terms of frequency reconfiguration, omnidirectional radiation pattern, and radiation efficiency. The proposed graphene antennas were printed on a quartz substrate, and simulated on CST Microwave Studio. The results show that the excellence of the proposed antennas in reflection coefficient, dynamic frequency reconfiguration (DFR), and omnidirectional radiation pattern. The operation frequency of the two antennas varies from 0.74 to 1.26 THz and from 0.92 to 1.15 THz, respectively. The proposed antennas have great prospects in wireless communications/sensors.

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