A liquid-metal tunable electromagnetic-bandgap microstrip filter

Ohta, Aaron T.; Guo, Shuyan; Lei, Bao Jun; Hu, Wenqi; Shiroma, Wayne A.

doi:10.1109/icwits.2012.6417735

Cited by 6 publications

(3 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Recently, liquid metals have been implemented in microwave devices such as switches [6], tuners [7], resonators [8]- [10], filters [11]- [13], and antennas [14]- [19]. A liquid-metal planar Yagi-Uda demonstrated 360 of beam steering, but only at a single frequency [20].…”

Section: Introductionmentioning

confidence: 99%

A Liquid-Metal Monopole Array With Tunable Frequency, Gain, and Beam Steering

Morishita

Kitamura

Ohta

et al. 2013

Antennas Wirel. Propag. Lett.

Self Cite

114

View full text Add to dashboard Cite

A reconfigurable five-element Yagi-Uda monopole array is presented that utilizes pressure-driven liquid-metal elements. There is one centrally located driven element and six parasitic elements in the array, all of which utilize liquid metal so that their physical lengths can be varied. This allows the array to tune to different operational frequencies, vary the number of director elements, and change parasitic elements from reflectors to directors, and vice versa. The measured results show beam steering along a single axis and 1.33 dB of gain tuning at 2.4 and 3.87 GHz.

show abstract

Section: Introductionmentioning

confidence: 99%

A Liquid-Metal Monopole Array With Tunable Frequency, Gain, and Beam Steering

Morishita

Kitamura

Ohta

et al. 2013

Antennas Wirel. Propag. Lett.

Self Cite

114

View full text Add to dashboard Cite

show abstract

“…More versatile devices with the ability to dynamically reconfigure, tune, erase or write electrical circuits are possible if incorporating liquid metal components. Recently, the use of liquid metal in reconfigurable microstrip RF filters [158,159], wideband RF switches [160], FSS [161], antennas [98,[162][163][164][165][166] and plasmonic devices [167] have been reported. In these applications, though the control of current paths is significantly enhanced by pneumatically actuating liquid metal using pumps or contact pressure, the use of an external control system increases overall complexity, reduces switching speed and is unable to reconfigure actual wires.…”

Section: Reconfigurabilitymentioning

confidence: 99%

Fabrication methods and applications of microstructured gallium based liquid metal alloys

Khondoker

Sameoto

2016

Smart Mater. Struct.

150

117

View full text Add to dashboard Cite

This review contains a comparative study of reported fabrication techniques of gallium based liquid metal alloys embedded in elastomers such as polydimethylsiloxane or other rubbers as well as the primary challenges associated with their use. The eutectic gallium-indium binary alloy (EGaIn) and gallium-indium-tin ternary alloy (galinstan) are the most common non-toxic liquid metals in use today. Due to their deformability, non-toxicity and superior electrical conductivity, these alloys have become very popular among researchers for flexible and reconfigurable electronics applications. All the available manufacturing techniques have been grouped into four major classes. Among them, casting by needle injection is the most widely used technique as it is capable of producing features as small as 150 nm width by high-pressure infiltration. One particular fabrication challenge with gallium based liquid metals is that an oxide skin is rapidly formed on the entire exposed surface. This oxide skin increases wettability on many surfaces, which is excellent for keeping patterned metal in position, but is a drawback in applications like reconfigurable circuits, where the position of liquid metal needs to be altered and controlled accurately. The major challenges involved in many applications of liquid metal alloys have also been discussed thoroughly in this article.

show abstract

“…Microfluidics present a promising alternative for actuation mechanisms that offers advantages such as a poten-tially large tuning range, fast tuning speed and improved power handling capability. Interesting designs have been reported, including a liquid metal coaxial phase shifter [10], reconfigurable water antennas [11]- [18] and a water-based reconfigurable frequency selective rasorber [19]. Microfluidic techniques have also been used in tunable microwave filters.…”

Section: Introductionmentioning

confidence: 99%

A Frequency Tunable Liquid Cavity Bandpass Filter

Zhang,

Xing,

et al. 2023

Electromag. Sci.

View full text Add to dashboard Cite

A liquid-loaded frequency tunable cavity bandpass filter (BPF) is presented. A dielectric fluidic material, dimethyl silicone oil (DSO) with excellent thermophysical characteristics (working temperature from −50 ℃ to 180 ℃) and extremely low loss tangent is employed as a dielectric loading. The frequency reconfigurability of the proposed design is realized by altering the liquid level inside the cavity resonator. The filter achieves a wide frequency tuning range as well as a high Q factor. Moreover, this design shows significantly improved environmental suitability in extreme temperature cases, outperforming the existing microfluidic-based RF devices using water or liquid metals. A four-pole tunable cavity bandpass filter is designed and verified. A cross-coupling structure comprising a metal loop structure is used to introduce transmission zeros in the proposed filter, which enhances the skirt selectivity and out-of-band rejections. We demonstrate that the center frequency of the proposed BPF can be tuned from 4.92 GHz to 6.16 GHz, and the filter achieves a high Q factor between 521 and 1527. The measured results agree well with simulated results.

show abstract

A liquid-metal tunable electromagnetic-bandgap microstrip filter

Cited by 6 publications

References 6 publications

A Liquid-Metal Monopole Array With Tunable Frequency, Gain, and Beam Steering

A Liquid-Metal Monopole Array With Tunable Frequency, Gain, and Beam Steering

Fabrication methods and applications of microstructured gallium based liquid metal alloys

A Frequency Tunable Liquid Cavity Bandpass Filter

Contact Info

Product

Resources

About