A Wideband, Pressure-Driven, Liquid-Tunable Frequency Selective Surface

Lei, Bao Jun; Zamora, Alexis; Chun, Tyler F.; Ohta, Aaron T.; Shiroma, Wayne A.

doi:10.1109/lmwc.2011.2162942

Cited by 39 publications

(16 citation statements)

References 14 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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“…(3) Mechanically tunable FSS. This kind of tunable FSS is generally novel and interesting and has been achieved by, for example, changing a spring height via pressure to adjust the resonance frequency [13], or using pressure-driven fluidic control of mercury volumes [14]. Other examples included the use of a liquid metal [15], a rotatable square [16] and an origami structure [17].…”

Section: Introductionmentioning

confidence: 99%

Tunable Frequency Selective Surface Based on a Sliding 3D-Printed Inserted Dielectric

Qiu

Guo

2021

IEEE Access

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A novel mechanically tunable frequency selective surface (FSS) based on a sliding 3Dprinted inserted dielectric is presented in this paper. This paper first introduces the working mechanism of the tunable FSS, which indicates that the variable capacitance is the key to tunability. Based on this, we design an all-metal bandpass FSS with a certain thickness and a matching cross-shaped inserted dielectric. By changing the insertion depth of the dielectric, the resonance frequency can be adjusted. To optimize the performance, an improved structure based on a hollow support and a tripole slot is proposed. A tunable range from 3.24 to 5.52 GHz (53%) and good angular stability is obtained in the simulation. To verify this idea, we fabricate a cross slot prototype by 3D printing and mechanical engraving. Measured results show that this prototype has a continuous tunable range of 3.61 to 5.89 GHz (34.4%). INDEX TERMS Frequency selective surface (FSS), tunable, 3D printing, dielectric.

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“…A recent development for realizing a tunable filter is through the use of liquid metals, which allow conducting elements to be reconfigured, allowing continuous tuning in RF circuits while avoiding various tuning voltages that are needed in filters based on varactor diodes or MEMS [1]- [2]. Mercury is the most widely known liquid metal, and has been used in antennas [3], filters [4], switches [5]- [7], and frequency-selective surfaces [8]; however mercury is very toxic. A non-toxic metal, Galinstan, has been used for RF switches [9]- [10], antennas [11], resonators [12], and impedance tuners [13].…”

Section: Introductionmentioning

confidence: 99%