scholarly journals Two models of the reflection coefficient modulus meter in a wide frequency band using microwave radiometry

2017 ◽  
Vol 20 (4) ◽  
pp. 50-54
Author(s):  
A.V. Filatov ◽  
◽  
N.Ju. Belov ◽  
S.E. Tarasov ◽  
N.A. Filatov ◽  
...  
Keyword(s):  
Reflection Coefficient ◽  
Frequency Band ◽  
Microwave Radiometry ◽  
Wide Frequency Band

scholarly journals Unidirectional Invisibility Induced by Complex Anti-Parity–Time Symmetric Periodic Lattices

2019 ◽  
Vol 9 (18) ◽  
pp. 3808 ◽  
Author(s):  
Hui Cao ◽  
Dong Zhao ◽  
Ming Fang ◽  
Huang Guo ◽  
Yonghong Hu ◽  
...  
Keyword(s):  
Reflection Coefficient ◽  
Parameter Space ◽  
Frequency Band ◽  
Angular Frequency ◽  
Lateral Shift ◽  
The Other ◽  
Wide Frequency Band ◽  
Highly Sensitive ◽  
Highly Sensitive Sensors

Complex anti-parity-time symmetric periodic lattices, in a wide frequency band, can act as unidirectional invisible media. The reflection from one end is suppressed while it is enhanced from the other. Furthermore, unidirectional laser points (ULPs) which correspond to the poles of reflection from one end, arise in the parameter space composed of the permittivity and angular frequency. The phase of the reflection coefficient changes sharply near the ULPs. Subsequently, large lateral shift which is proportional to the slope of phase could be induced for the reflected beam. The study may find great applications in unidirectional invisibility, unidirectional lasers and highly sensitive sensors.

scholarly journals A New Design of a Wideband Miniature Antenna Array

2017 ◽  
Vol 7 (4) ◽  
pp. 1850
Author(s):  
Oulhaj Otman ◽  
Naima A. Touhami ◽  
Mohamed Aghoutane ◽  
Abdelmounaim Belbachir Kchairi
Keyword(s):  
Reflection Coefficient ◽  
Circular Polarization ◽  
Antenna Array ◽  
Frequency Band ◽  
Microstrip Antenna ◽  
Antenna Element ◽  
Wide Frequency Band ◽  
Microstrip Antenna Array ◽  
Miniature Antenna

In this work, we present a new configuration of a new miniature microstrip antenna array having a wide frequency band and with a circular polarization. The bandwidth is about 2GHz for a reflection coefficient under -10dB and centered on the ISM ‘Industrial Scientific Medical’ band at 5.8 GHz. To design such array, we have started the design by validating one antenna element at 10 GHz and after that by using the technique of defected ground, we have validated the antenna array in the frequency band [4 GHz -6 GHz] which will permit to miniature the dimensions. The final fabricated antenna array is mounted on an FR4 substrate, the whole area is 102.48 X 31.39 mm<sup>2</sup>  with a gain of 5dBi at 4GHz.

scholarly journals Physical Principles of a Piezo Accelerometer Sensitive to a Nearly Constant Signal

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3258 ◽  
Author(s):  
Valery Gupalov ◽  
Alexander Kukaev ◽  
Sergey Shevchenko ◽  
Egor Shalymov ◽  
Vladimir Venediktov
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Frequency Band ◽  
Linear Acceleration ◽  
High Sensitivity ◽  
Element Model ◽  
Wide Frequency Band ◽  
Piezoelectric Accelerometer ◽  
The Finite Element Model ◽  
Physical Principles

The paper considers the construction of a piezoelectric accelerometer capable of measuring constant linear acceleration. A number of designs are proposed that make it possible to achieve high sensitivity with small dimensions and a wide frequency band (from 10−5 Hz). The finite element model of the proposed design was investigated, and its output characteristic and scale factor (36 mV/g) were obtained.

scholarly journals Flexible ultrathin metamaterial absorber for wide frequency band, based on conductive fibers

2018 ◽  
Vol 19 (1) ◽  
pp. 711-717 ◽  
Author(s):  
Young Ju Kim ◽  
Ji Sub Hwang ◽  
Bui Xuan Khuyen ◽  
Bui Son Tung ◽  
Ki Won Kim ◽  
...  
Keyword(s):  
Frequency Band ◽  
Metamaterial Absorber ◽  
Wide Frequency Band ◽  
Conductive Fibers

scholarly journals Nonlinearity Measurements Using Alternating Current

1978 ◽  
Vol 5 (2) ◽  
pp. 91-98 ◽  
Author(s):  
Vladimír Ryšánek ◽  
Carlo Corsi ◽  
Arnaldo d'Amico
Keyword(s):  
Frequency Band ◽  
Measurement Technique ◽  
Alternating Current ◽  
Noise Measurement ◽  
Wide Frequency Band ◽  
Semiconductor Structures ◽  
Different Types ◽  
Homogeneous Structures ◽  
Lock In

The nonlinearity measurement technique described uses an adapted conventional lock-in-amplifier. This technique enables us to measure small nonlinearities over a wide frequency band and is more sensitive than the 1/f noise measurement used to detect non-homogeneous structures in conductors, resistors and semiconductor components. Results illustrating uses of this method are presented for different types of resistor and semiconductor structures.

Wide Frequency Band Characterization

2013 ◽  
pp. 603-638
Author(s):  
D. Flandre ◽  
J.-p. Raskin ◽  
V. Kilchytska
Keyword(s):  
Frequency Band ◽  
Wide Frequency Band
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