Measurement of density distribution in a small cell by digital phase-shift holographic interferometry

2001 ◽  
Author(s):  
Toshiharu Mizukaki ◽  
Takeshi Seto ◽  
Kazuyoshi Takayama
Keyword(s):  
Phase Shift ◽  
Density Distribution ◽  
Holographic Interferometry ◽  
Small Cell ◽  
Digital Phase

A digital phase shift method for phase compensation of electronic transformer

2017 ◽  
Vol 40 (13) ◽  
pp. 3690-3695 ◽  
Author(s):  
Wei Wei ◽  
Han-miao Cheng ◽  
Fan Li ◽  
Deng-ping Tang ◽  
Shui-bin Xia
Keyword(s):  
Phase Shift ◽  
Phase Error ◽  
Recursion Formula ◽  
Rogowski Coil ◽  
Shift Method ◽  
Electronic Transformer ◽  
Digital Phase ◽  
Fitting Algorithm ◽  
Fixed Phase ◽  
Phase Shift Method

When sampling analog signal, the electronic transformer generally produces a fixed phase error that will compromise the measurement accuracy and require a phase shift method for correction. In this paper, we propose a digital phase shift method based on least squares fitting algorithm and derive the recursion formula of digital phase shift. The simulation has also been done to analysis its performance. The result shows that the method has high phase shift resolution and precision. By applying the method to an electronic transformer based on Rogowski coil, we have experimentally verified the feasibility and validity of the method.

Investigation on Plasma Electron Density Distribution with Finite Holographic Interferometry

2015 ◽  
Vol 42 (1) ◽  
pp. 0102008
Author(s):  
雷岚 Lei Lan ◽  
曹娜 Cao Na ◽  
曹亮 Cao Liang ◽  
徐青 Xu Qing ◽  
韩长材 Han Changcai ◽  
...  
Keyword(s):  
Density Distribution ◽  
Electron Density ◽  
Holographic Interferometry ◽  
Electron Density Distribution ◽  
Plasma Electron ◽  
Plasma Electron Density

scholarly journals Design of 3-Bit Digital RF Phase Shifter for Wireless Communication

2019 ◽  
Vol 8 (2) ◽  
pp. 2292-2296
Keyword(s):  
Phase Shift ◽  
Wireless Communication ◽  
Transmission Line ◽  
Phase Shifter ◽  
Phased Array ◽  
Low Cost ◽  
Phase Shifters ◽  
Phased Array Antenna ◽  
Radio System ◽  
Digital Phase

In this paper, a 3-bit digital phase shifter based on switched transmission line technique using coplanar waveguide is proposed. The design has the resonant frequency of 10 GHz which can be used in wireless communication applictaions. Recent developments in radio frequency components development has raised as a significant way for constructing low loss phase shifters. MEMS phase shifters whose insertion loss is low and high isolation uses minimum power. This helps to bring low cost and light weighted phased array antennas. The transmission line length and wavelength decides the characteristics of phase shift. The phase shifter design consists of coplanar waveguides having center conductor width of 100µm and the gap of 14 µm on a FR-4 epoxy substrate with thickness of 1.6mm. The design is simulated using ADS to yield phase shift of 45, 90 and 180. The benefits of digital phase shifters include achieving flat phase over a wide bandwidth as well as having higher power handling and linearity with uniform performance. The phase shifters are used in different fields which includes microwave devices, feeder of radio system, phased array antenna, coherent radio system, etc.

Sign in / Sign up

Export Citation Format

Share Document