Microfluidically Reconfigurable Rectangular Waveguide Filter Using Liquid Metal Posts

Vahabisani, Nahid; Khan, Sabreen; Daneshmand, Mojgan

doi:10.1109/lmwc.2016.2605450

Cited by 28 publications

(27 citation statements)

References 6 publications

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“…Finally, we compared the proposed filter with the filters in references . The filters in references have frequency‐tunable performance, but they are not suitable for flexible applications. The filters in references are bendable, however, less stretchable or twistable.…”

Section: Resultsmentioning

confidence: 99%

“…Finally, a syringe was used to inject liquid metal into the microfluidic channels to form a complete filter. Compared with the previously reported similar fabrication process, the improved fabrication process eliminated punching holes and additional encapsulating operations with uncured PDMS mixture. Furthermore, multilayer lamination capability is obtained, which can be used to implement more complicated multilayer structures.…”

Section: Filter Design and Fabrication Processmentioning

confidence: 97%

“…By dynamically moving the liquid metal to reshape the resonator, a frequency‐agile second order filter is designed in reference, where fluid metal layer is placed on a Rogers 5880 substrate with a thickness of 1.575 mm. In addition, a reconfigurable rectangular waveguide filter was realized by adopting adjustable liquid metal posts to insert into the waveguide resonators . Obviously, the above‐mentioned two filters are not suitable for flexible applications.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, a reconfigurable rectangular waveguide filter was realized by adopting adjustable liquid metal posts to insert into the waveguide resonators. 5 Obviously, the above-mentioned two filters are not suitable for flexible applications. By taking the advantage of the stretchability of the liquid metal, an unbalanced loop antenna 6 and a stretchable radio frequency antenna with a wide range mechanically tuned frequency 7 are designed.…”

Section: Introductionmentioning

confidence: 99%

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A flexible liquid-metal alloy bandpass filter

Guo

Chen

et al. 2018

Int J RF Microw Comput Aided Eng

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This article presents a liquid‐metal Galinstan alloy bandpass filter (BPF) with good flexibility, which is fabricated by an improved soft lithography process. The Galinstan alloy is enclosed in the microfluidic channels of elastomeric polydimethylsiloxane (PDMS) substrates. Together with the PDMS substrates, the Galinstan alloy based filter features bending, twisting and stretching capabilities along any direction. A second‐order open‐loop resonator filter with 2.4 GHz center frequency and 15% fractional bandwidth was designed and fabricated to verify this concept. Experiments show that frequency response of the filter is almost unaffected in the case of bending of the different radii or twisting, while its center frequency slightly shifts down in the stretching condition. The proposed filter can be used for the flexible and conformal electronics.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Filter Design and Fabrication Processmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A flexible liquid-metal alloy bandpass filter

Guo

Chen

et al. 2018

Int J RF Microw Comput Aided Eng

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show abstract

“…To reduce the volume and weight of waveguide filters, printed circuit inserts are often used on the E-plane/transverse plane of a waveguide [1][2][3][4]. For tuning the operating frequency, several mechanisms, such as magnetic tuning [5], varactor loaded frequency selective surface [6][7][8], micro-electromechanical system [9,10], E-plane varactor [11], optical tuning [12][13][14], liquid metal posts [15], are used. Following the requirements of multiband filters, several multiband waveguide filters have also been proposed [16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

A Frequency Reconfigurable Dual Pole Dual Band Bandpass Filter for X-Band Applications

Bage¹,

Das²

2017

PIER Letters

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This paper presents a frequency reconfigurable dual-pole, dual-band waveguide bandpass filter. Varactor diode and chip capacitor loaded planar split ring resonators are placed on the transverse plane of a waveguide to form the filter. Numerical simulations are carried out using CST microwave studio (version 14). Measured tuning ranges of the bands are 8.12-8.58 GHz and 10.22-10.68 GHz, respectively. Measured result shows good agreement with the simulated one. The total length of the filter is 10 mm.

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A tunable broadband bandpass filter based on quarter wavelength resonators

Zhao¹,

Zhang

2021

Int J RF Mic Comp-Aid Eng

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In this letter, a tunable broadband bandpass filter (BPF) based on quarter wavelength resonators was proposed. The resonators and coupling structures were mainly consisted of quarter wavelength transmission lines and tunable devices loaded at the two ends of the transmission lines. The resonant frequency of the BPF can be adjusted through changing the total capacitance at the both ends of the resonators. Especially, the coupling strength between resonators can be adjusted by adjusting the value ratio of the capacitor between the two ends. The tunable BPF in this scheme had the advantages of simply design. The bandwidth and center frequency of the tunable BPF can be tuned independently at the same time. As a demonstrator, an eight-orders filter was designed and fabricated on Rogers3006 substrate. The center frequency can be tuned in the range of 0.81 to 1.28 GHz, the relative tuning range was 45%. The relative bandwidth of the tunable filter can be tuned in the range of 14% to 38%. The simulated results were agreement well with the measured ones.

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Microfluidically Reconfigurable Rectangular Waveguide Filter Using Liquid Metal Posts

Cited by 28 publications

References 6 publications

A flexible liquid-metal alloy bandpass filter

A flexible liquid-metal alloy bandpass filter

A Frequency Reconfigurable Dual Pole Dual Band Bandpass Filter for X-Band Applications

A tunable broadband bandpass filter based on quarter wavelength resonators

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