Planar Inverted-F Antenna (PIFA) Using Microfluidic Impedance Tuner

Lee, Minjae; Lim, Sungjoon

doi:10.3390/s18103176

Cited by 10 publications

(7 citation statements)

References 20 publications

(19 reference statements)

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“…Previously, we injected fluid into microfluidic channels (100 × 0.51 mm, length × width) 55 , and 1–1.5 s was required to completely fill the microfluidic channel; hence, the infill rate = 66.7–100 mm/sec. In the current study, the microfluidic channel = 120 × 4 mm (length × diameter); hence, the estimated realistic switching time to completely fill channel A was 70–75 s.…”

Section: Resultsmentioning

confidence: 99%

Hydrodynamic metasurface for programming electromagnetic beam scanning on the Azimuth and elevation planes

Naqvi

Lim

2022

Microsyst Nanoeng

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The development of multifunctional and reconfigurable metasurfaces capable of manipulating electromagnetic waves has created new opportunities for various exciting applications. Extensive efforts have been applied to exploiting active metasurfaces with properties that can be controlled by externally controlling active components. However, previous approaches have poor switch isolation, power handling limitations due to nonlinear effects, and complex biasing networks. Therefore, dynamically tunable metasurfaces have become a burgeoning field in many research areas. This paper reports a hydrodynamic metasurface (HMS) that can be programmed to realize electromagnetic beam scanning on the azimuth and elevation planes. The proposed HMS platform incorporates four micropumps, each controlling four metasurface elements via microfluidic channels, built into the HMS base. The proposed platform regulates microfluidic flow through micropumps, causing irregularities in incident wave transmission phase. An HMS was built as a proof of concept, and far-field scanning experiments were performed. Numerical and experimental results verify the feasibility of electromagnetic beam scanning using a hydrodynamic metasurface. This work advances metasurface research, with very high potential for wide-ranging application and a promising route for replacing bulky cascading active components.

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Section: Resultsmentioning

confidence: 99%

Hydrodynamic metasurface for programming electromagnetic beam scanning on the Azimuth and elevation planes

Naqvi

Lim

2022

Microsyst Nanoeng

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“…[12,16] However, substantial power attenuation is expected due to impedance mismatch on different body parts. [18,21,27,28] Mismatch also occurs between users given their unique tissue and bone arrangements. [29,30] Conventionally, an intensive simulation is required to optimize the antenna structure.…”

Section: In Situ and In Operando Adaptationmentioning

confidence: 99%

Evolvable Skin Electronics by In Situ and In Operando Adaptation

Kim

Choi

Kim

et al. 2021

Adv Funct Materials

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Latest developments in thin-film electronics have put skin electronics in the limelight. Integration of multiple skin sensors and wireless power transferring ability are cardinal components for continuous acquisition of the human signals, enabling higher level of applications in wearable healthcare and AR/ VR devices. Skin sensor is considerably influenced by target body parts and users where it is attached, and thus face various design adjustments for the best performance. However, most skin electronics using conventional fabrication methods have a fixed design for specific targets and users only and face great challenge when they need design changes, for it has to re-initialize entire fabrication process even for the simplest design modification. Here, in situ and in operando adaptation (SOA) is presented, a revolutionary customizable electronic fabrication platform that allows simultaneous evolvable design modification and addition of new functionality to original skin electronics while they are in operation on a human skin. SOA renders immediate response to various user specifications possible, offering concurrent customization for various wearable and wireless applications including human physiology/motion sensors. Furthermore, SOA offers simultaneous impedance optimization in different body parts and users which enables on-skin wireless power supply. These findings will prove a boon to the development of customizable wearable skin-like electronics.

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“…The power consumption of each micro-pump was 50 mW. The instill rate of the micropump used in the proposed filter is 66.7–100 mm/s when the channel width is 0.51 mm [ 29 ]. Because the filter has a channel width of 2.5 mm and a length of 6.3 mm, the switching speed is estimated to be 0.3 ms.…”

Section: Fabrication and Measurementmentioning

confidence: 99%

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

Park

Lee

Lim

2019

Sensors

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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.

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Planar Inverted-F Antenna (PIFA) Using Microfluidic Impedance Tuner

Cited by 10 publications

References 20 publications

Hydrodynamic metasurface for programming electromagnetic beam scanning on the Azimuth and elevation planes

Hydrodynamic metasurface for programming electromagnetic beam scanning on the Azimuth and elevation planes

Evolvable Skin Electronics by In Situ and In Operando Adaptation

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

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