PMID- 28350355
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20180222
LR  - 20181113
IS  - 1424-8220 (Electronic)
IS  - 1424-8220 (Linking)
VI  - 17
IP  - 4
DP  - 2017 Mar 28
TI  - Frequency-Switchable Microfluidic CSRR-Loaded QMSIW Band-Pass Filter Using a 
      Liquid Metal Alloy.
LID - 10.3390/s17040699 [doi]
LID - 699
AB  - In this paper, we have proposed a frequency-switchable complementary split-ring 
      resonator (CSRR)-loaded quarter-mode substrate-integrated-waveguide (QMSIW) 
      band-pass filter. For frequency switching, a microfluidic channel and liquid 
      metal are used. The liquid metal used is eutectic gallium-indium (EGaIn), 
      consisting of 24.5% indium and 75.5% gallium. The microfluidic channels are built 
      using the elastomer polydimethylsiloxane (PDMS) and three-dimensional-printed 
      microfluidic channel frames. The CSRR-loaded QMSIW band-pass filter is designed 
      to have two states. Before the injection of the liquid metal, the measured center 
      frequency and fractional bandwidths are 2.205 GHz and 6.80%, respectively. After 
      injection, the center frequency shifts from 2.205 GHz to 2.56 GHz. Although the 
      coupling coefficient is practically unchanged, the fractional bandwidth changes 
      from 6.8% to 9.38%, as the CSRR shape changes and the external quality factor 
      decreases. After the removal of the liquid metal, the measured values are similar 
      to the values recorded before the liquid metal was injected. The repeatability of 
      the frequency-switchable mechanism is, therefore, verified.
FAU - Eom, Seunghyun
AU  - Eom S
AD  - School of Electrical and Electronics Engineering, College of Engineering, 
      Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 156-756, Korea. 
      umsh0303@gmail.com.
FAU - Memon, Muhammad Usman
AU  - Memon MU
AD  - School of Electrical and Electronics Engineering, College of Engineering, 
      Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 156-756, Korea. 
      musmanm@outlook.com.
FAU - Lim, Sungjoon
AU  - Lim S
AD  - School of Electrical and Electronics Engineering, College of Engineering, 
      Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 156-756, Korea. 
      sungjoon@cau.ac.kr.
LA  - eng
PT  - Journal Article
DEP - 20170328
PL  - Switzerland
TA  - Sensors (Basel)
JT  - Sensors (Basel, Switzerland)
JID - 101204366
PMC - PMC5421659
OTO - NOTNLM
OT  - 3D printing
OT  - CSRR
OT  - EGaIn
OT  - QMSIW
OT  - band-pass filter
OT  - frequency-switchable
OT  - microfluidic channel
COIS- The authors declare no conflict of interest.
EDAT- 2017/03/30 06:00
MHDA- 2017/03/30 06:01
PMCR- 2017/03/28
CRDT- 2017/03/29 06:00
PHST- 2017/01/11 00:00 [received]
PHST- 2017/03/27 00:00 [revised]
PHST- 2017/03/27 00:00 [accepted]
PHST- 2017/03/29 06:00 [entrez]
PHST- 2017/03/30 06:00 [pubmed]
PHST- 2017/03/30 06:01 [medline]
PHST- 2017/03/28 00:00 [pmc-release]
AID - s17040699 [pii]
AID - sensors-17-00699 [pii]
AID - 10.3390/s17040699 [doi]
PST - epublish
SO  - Sensors (Basel). 2017 Mar 28;17(4):699. doi: 10.3390/s17040699.