scholarly journals Switchable Bandpass/Bandstop Filter Using Liquid Metal Alloy as Fluidic Switch

Sensors ◽  
2019 ◽  
Vol 19 (5) ◽  
pp. 1081 ◽  
Author(s):  
Eiyong Park ◽  
Minjae Lee ◽  
Sungjoon Lim
Keyword(s):  
Liquid Metal ◽  
Metal Alloy ◽  
Center Frequency ◽  
Pass Band ◽  
Quarter Wavelength ◽  
Micro Pump ◽  
Band Stop Filter ◽  
Liquid Metal Alloy ◽  
Band Pass ◽  
Bandstop Filter

In this paper, we propose a switchable band-pass/band-stop filter using liquid metal alloy as a fluidic switch. The filter is designed based on the Chebyshev response and implemented using a three-stage quarter-wavelength resonant structure. The fluidic switch is realized by injecting eutectic gallium–indium (EGaIn) in the microfluidic stubs, engraved in the polydimethylsiloxane (PDMS) material. When the fluidic switch selects the short stub using a micro-pump and microprocessor for switching, the filter acts as a bandpass filter (BPF) with the short stubs. When the fluidic switch selects the open stub, the filter acts as the bandstop filter (BSF) with the open stubs. At the BPF mode, the center frequency is 2.5 GHz and the 1-dB bandwidth is 1.75–3.07 GHz. The insertion loss is 0.5-dB ± 0.4-dB. At the BSF mode, the 15-dB bandstop bandwidth is 2.4–2.65 GHz with 2.5 GHz center frequency.

scholarly journals Switchable Terahertz Band-Pass/Band-Stop Filter Enabled by Hybrid Vanadium Dioxide Metamaterial

2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
Ying Chen ◽  
Jianwei Cheng ◽  
Chaowu Liang
Keyword(s):  
Vanadium Dioxide ◽  
Surface Current ◽  
Center Frequency ◽  
Pass Band ◽  
Metallic State ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Band Stop Filter ◽  
Band Pass ◽  
Functional Components

To date, little research has been carried out on the integration of switchable and diversified functionalities into a single metamaterial in the terahertz (THz) range. Here, a hybrid vanadium dioxide (VO2) metamaterial was designed with switchable properties of band-pass filter and band-stop filter in the frequency range of 0.3–1.6 THz. Simulations demonstrated that under TE polarization, the proposed system acted as band-stop filter with the center frequency of 0.95 THz when VO2 is in the insulating state. Upon the transformation of VO2 into the metallic state, the proposed system behaved as a band-pass filter with a transmittance of >80%. The physical mechanism of the band-pass/band-stop conversion was examined by analyzing the surface current distribution of the designed device. The switchable characteristics of this structure can enable its wide application in tunable THz functional components such as amplitude modulators, polarization control, and intelligent switches.

scholarly journals Frequency-Switchable Microfluidic CSRR-Loaded QMSIW Band-Pass Filter Using a Liquid Metal Alloy

Sensors ◽  
2017 ◽  
Vol 17 (4) ◽  
pp. 699 ◽  
Author(s):  
Seunghyun Eom ◽  
Muhammad Memon ◽  
Sungjoon Lim
Keyword(s):  
Liquid Metal ◽  
Metal Alloy ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Liquid Metal Alloy ◽  
Band Pass

Dynamic Processes During Pulsed Gas Injection Into Liquid Column

2016 ◽  
Author(s):  
P. D. Lobanov ◽  
O. N. Kashinsky ◽  
A. S. Kurdyumov ◽  
N. A. Pribaturin
Keyword(s):  
Liquid Metal ◽  
Gas Phase ◽  
Gas Injection ◽  
High Amplitude ◽  
Metal Alloy ◽  
Dynamic Processes ◽  
Flow Parameters ◽  
Liquid Metal Alloy ◽  
Inner Diameter ◽  
Gas Volume

An experimental study of dynamic processes during pulsed gas injection into quiescent liquids was performed. Both water and low melting temperature metal alloy were used as test liquids. Air and argon were used as gas phase. The test sections were vertical cylindrical columns 25 and 68 mm inner diameter. Measurements of flow parameters during gas injection were performed. Water – air experiments were performed at room temperature, the temperature of liquid metal alloy was 135 deg C. Time records of pressure in the liquid and in gas phase above the liquid were obtained. Measurements of liquid temperature and level of liquid surface were performed. It was shown that at pulse gas injection into liquid metal high amplitude pressure fluctuation may arise. Also the fluctuation variation of the free surface of the liquid may appear which are connected with the oscillations of the gas volume. Experimental data obtained may be used for verification & validation of modern CFD codes.

Temperature dependence of the electric characteristics of liquid metal alloy ion sources

2000 ◽  
Vol 33 (6) ◽  
pp. 692-695 ◽  
Author(s):  
L Bischoff ◽  
J Teichert ◽  
Th Ganetsos ◽  
G L R Mair
Keyword(s):  
Liquid Metal ◽  
Temperature Dependence ◽  
Ion Sources ◽  
Metal Alloy ◽  
Liquid Metal Alloy

A Filtering Power Divider with Tunable Center Frequency and Wide Stopband

Frequenz ◽  
2019 ◽  
Vol 73 (9-10) ◽  
pp. 301-306
Author(s):  
Xuehan Hu ◽  
Feng Wei ◽  
Jiawen Hao ◽  
Xiaowei Shi
Keyword(s):  
Design Method ◽  
Power Divider ◽  
Center Frequency ◽  
Electrical Length ◽  
Transmission Zeros ◽  
Quarter Wavelength ◽  
Varactor Diodes ◽  
Measurement Results ◽  
Band Pass ◽  
Good Agreement

AbstractIn this paper, a tunable power divider (PD) with a good band-pass filtering response using quarter-wavelength stepped impedance resonators (SIRs) is presented. By appropriately adjusting the impedance and electrical length ratio of SIR, the proposed structure can achieve wide stopband performance. Meanwhile, four varactor diodes are loaded to the external resonators to achieve electrical reconfiguration. In addition, a pair of transmission zeros (TZs) can be generated by applying source and load coupling on each side of the passband, which can effectively improve passband selectivity and out-of-band rejection. In order to verify the feasibility of the proposed design method, a prototype circuit of the proposed filtering power divider (FPD) with tunable center frequency is simulated, fabricated and measured. A good agreement between the simulation and measurement results is observed.

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