A liquid-metal reconfigurable double-stub tuner

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

doi:10.1109/mwsym.2012.6259372

Cited by 13 publications

(6 citation statements)

References 7 publications

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“…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.

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114

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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.

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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

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“…In the work of [41], to nullify the effect of a human hand on antenna performance, a microfluid-based planar inverted F antenna impedance tuning is introduced. The impedance matching is attained by changing the impedance of the liquid A reconfigurable double stub tuner with Galinston liquid metal is proposed in the work of [44]. The whole structure is supported on Roger RT/Duroid 5870 substrate.…”

Section: Fluidic Antennasmentioning

confidence: 99%

A Recent Approach towards Fluidic Microstrip Devices and Gas Sensors: A Review

et al. 2022

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This paper aims to review some of the available tunable devices with emphasis on the techniques employed, fabrications, merits, and demerits of each technique. In the era of fluidic microstrip communication devices, versatility and stability have become key features of microfluidic devices. These fluidic devices allow advanced fabrication techniques such as 3D printing, spraying, or injecting the conductive fluid on the flexible/rigid substrate. Fluidic techniques are used either in the form of loading components, switching, or as the radiating/conducting path of a microwave component such as liquid metals. The major benefits and drawbacks of each technology are also emphasized. In this review, there is a brief discussion of the most widely used microfluidic materials, their novel fabrication/patterning methods.

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“…When compared to diode switches, the liquid metal switch provides advantages, such as wider switching range, high power capability, no bias network, and direct current (DC) power consumption, and less parasitic effect. Previously, a microfluidic impedance tuner with a double stub structure has been proposed [ 17 , 18 ] where the liquid metal is continuously injected into long fluidic channels. In this work, the liquid metal is used as a switch in short fluidic channels.…”

Section: Introductionmentioning

confidence: 99%

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

Lee

Lim

2018

Sensors

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This paper proposes a microfluidic impedance tuner that is applied to a planar inverted-F antenna (PIFA). The proposed microfluidic impedance tuner is designed while using a simple double-stub and the impedance is changed by tuning the stub length. In this work, the stub length can be tuned by injecting a liquid metal alloy to the microfluidic channels. Initially, the PIFA operates at 900 MHz with impedance matching of 50 Ω. The impedance is mismatched when a hand is placed close to the antenna. The mismatched impedance is matched to 50 Ω by injecting the liquid metal alloy. The antenna is fabricated on the FR-4 substrate, and the impedance tuner is fabricated on polydimethylsiloxane (PDMS). In order to inject the liquid metal alloy, a piezoelectric micropump and microprocessor are used in the measurement. At 900 MHz, the return loss is successfully tuned from 4.69 dB to 18.4 dB when a hand is placed 1 mm above the antenna.

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A liquid-metal reconfigurable double-stub tuner

Cited by 13 publications

References 7 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

A Recent Approach towards Fluidic Microstrip Devices and Gas Sensors: A Review

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

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