Low-frequency noise in GaN-based two-dimensional structures

2003 ◽  
Author(s):  
Serguei L. Roumiantsev ◽  
Michael S. Shur
Keyword(s):  
Low Frequency ◽  
Frequency Noise ◽  
Two Dimensional ◽  
Low Frequency Noise

Low frequency noise in two‐dimensional metal‐semiconductor field effect transistor

1996 ◽  
Vol 68 (22) ◽  
pp. 3138-3140 ◽  
Author(s):  
M. E. Levinshtein ◽  
S.‐L. Rumyantsev ◽  
G. S. Simin ◽  
H. Park ◽  
W. C. B. Peatman ◽  
...  
Keyword(s):  
Field Effect ◽  
Field Effect Transistor ◽  
Low Frequency ◽  
Frequency Noise ◽  
Two Dimensional ◽  
Low Frequency Noise ◽  
Effect Transistor

Low frequency noise in two-dimensional lateral GaN/AlGaN Schottky diodes

2016 ◽  
Vol 109 (3) ◽  
pp. 033502 ◽  
Author(s):  
G. Cywiński ◽  
K. Szkudlarek ◽  
P. Kruszewski ◽  
I. Yahniuk ◽  
S. Yatsunenko ◽  
...  
Keyword(s):  
Schottky Diodes ◽  
Low Frequency ◽  
Frequency Noise ◽  
Two Dimensional ◽  
Low Frequency Noise

Theoretical and Experimental Study on Phononic Crystal Structures for Low-Frequency Noise Reduction in the Brake

2013 ◽  
Author(s):  
Li Shen ◽  
Jiu Hui Wu
Keyword(s):  
Noise Reduction ◽  
Phononic Crystal ◽  
Low Frequency ◽  
Equivalent Model ◽  
Frequency Noise ◽  
Steel Matrix ◽  
Two Dimensional ◽  
Low Frequency Noise ◽  
Frequency Range ◽  
Extremely Low Frequency

Phononic crystal is an artificial periodic structure in which elastic constants distribute periodically. In this paper, a two dimensional Bragg scattering phononic crystal was introduced into low-frequency noise reduction facility in the brake originally. Through the theoretical analysis by using Plane-wave Expansion Method to obtain the band diagram of a phononic crystal with holes periodically arranged in the 45 carbon steel plate and establishing the equivalent model in motion as the brake, we find an approximate bandgap between 0–5400Hz in the low-frequency range while the complete static bandgaps are distributed in the high-frequency range. It is believed that this kind of extremely low-frequency bandgap is due to the combination of the vibration of a single scatter and the interaction among scatters. In order to demonstrate the theory, contrastive experiment was taken. Noise spectrum diagram of the origin plate without holes was obtained in the first experiment. According to the equivalent model, the two dimensional air column/steel matrix phononic crystal structure in which filling rate was 40% was designed to apply in the test apparatus so that the frequency range (2050 to 2300Hz) of strong noise would be involved in this bandgap. Moreover, the noise in the whole frequency range (0–2550Hz) went down. This phenomenon proved that experiment result was coincident with theoretic consequence. The maximum decreasing amplitude of the noise reached as much as 25dB and the average decreasing amplitude was about 13dB from 2050 to 2300 Hz. In a word, this bandgap which is the combination effect of structure periodicity or the Mie scattering has an obvious extremely low-frequency characteristic in noise and vibration control in the brake.

Suppression method of low-frequency noise for two-dimensional integrated magnetic sensor

2017 ◽  
Vol 56 (4S) ◽  
pp. 04CF05 ◽  
Author(s):  
Takayuki Kimura ◽  
Yusuke Sakairi ◽  
Akihiro Mori ◽  
Toru Masuzawa
Keyword(s):  
Low Frequency ◽  
Magnetic Sensor ◽  
Frequency Noise ◽  
Two Dimensional ◽  
Low Frequency Noise ◽  
Suppression Method

Study on Locally Resonant Phononic Crystals Based on Automotive Noise Control

2011 ◽  
Vol 299-300 ◽  
pp. 1208-1211
Author(s):  
Yu Yang He ◽  
Xiao Xiong Jin ◽  
Huan Wei
Keyword(s):  
Band Gap ◽  
Noise Control ◽  
Low Frequency ◽  
Simulation Method ◽  
Phononic Crystals ◽  
Simplified Model ◽  
Frequency Noise ◽  
Two Dimensional ◽  
Low Frequency Noise ◽  
The Impact

Automotive low frequency noise is difficult to control in a traditional way. Locally resonant phononic crystals (PCs) can forbid the propagation of certain frequency. This PCs’ structure also can be fabricated to apply in automotive noise control. The simulation method is applied to establish the model of two-dimensional (2D) locally resonant phononic crystals in order to research the impact of the parameters on the propagation. The band gap of locally resonant phononic crystals in z mode is calculated using the simplified model.

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