Tunable slot antenna using varactors and photodiodes

Carrasquillo-Rivera, I.; Popović, Zoya; Solis, R.A.R.

doi:10.1109/aps.2003.1220327

Cited by 8 publications

(7 citation statements)

References 1 publication

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“…The TBW and gain are improved over similar liquid-metal slot antennas, which must use electrolyte filled channels for CEW ac-tuation [54]. These results are also comparable to frequency-reconfigurable slot antennas implemented with varactors [41], PIN diodes [43,44], and MEMS switches [45]. A disadvantage of this antenna is the approximate one second switching speed achieved with manual pneumatic actuation via syringe.…”

Section: Discussionsupporting

confidence: 50%

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Liquid-Metal-Based Reconfigurable Components for RF Front Ends

et al. 2015

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All Rights Reserved AcknowledgmentsI feel that this is a rare opportunity for me to share a bit of candidness and hope to make the most of it. I truly owe the completion of this thesis to many friends and family members and am sorry that I cannot thank you all. hope we can all stay in touch and get a bite and a drink together every once in a while. To leave off I would like to quote Andy Morishita and say "memories are made together" and I will always cherish these past few years we all had. This thesis focuses on the development of liquid-metal-based reconfigurable components for radio-frequency (RF) front ends. Reconfigurable components allow the RF front end to dynamically change key radio parameters such as output power, signal carrier frequency, and bandwidth. These capabilities enable the radio transceiver to adapt to environmental and communication channel changes on the fly, according to programmed protocols and priorities. As a low-loss metallic conductor, the liquid metal Galinstan is well suited for RF applications, and its fluidic nature makes it a natural candidate for reconfigurable architectures. Three liquid-metal based components are described: a frequency-tunable substrate integrated waveguide cavity filter, an electromagnetic bandgap phase shifter, and a frequency-reconfigurable slot antenna. These components are designed, fabricated, and tested and the advantages and disadvantages of using liquid metal are discussed. iv

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Section: Discussionsupporting

confidence: 50%

“…Antennas are typically made reconfigurable using variable reactive components such as varactors [41,42] and PIN diodes [43,44]. However, these semiconductor elements introduce parasitics and nonlinearities, which can limit their operational frequency range and reduce gain [43,44].…”

Section: Introductionmentioning

confidence: 99%

Liquid-Metal-Based Reconfigurable Components for RF Front Ends

et al. 2015

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“…Frequency-tunable slot antennas are usually achieved by dynamically shorting the aperture in strategic locations through the use of PIN diodes [1] or varactors [2], [3].…”

Section: Introductionmentioning

confidence: 99%

Frequency-tunable slot antenna using continuous electrowetting of liquid metal

Gough

Dang

Morishita

et al. 2014

2014 IEEE MTT-S International Microwave Symposium (IMS2014)

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This paper presents a frequency-tunable slot an tenna which uses liquid metal to vary the electrical length of the radiating aperture. The liquid metal is driven by continuous elec trowetting (CEW), a process by which motion is induced in a liquid-metal droplet through the application of a potential gradi ent across an electrolytic carrier fluid. The process is both fully reversible and repeatable, and the low-voltage electrical driving mechanism allows for simpler integration into electronic archi tectures than more common hydraulic methods. We believe this is the first instance of CEW being used to create a tunable RF device.

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“…Furthermore, this benefit can be achieved with a smaller overall geometry because multiple antennas are not required . In many of the reconfigurable antenna designs in published literature; PIN diodes, RF MEMS switches, and optical switches have been used to reconfigure the antennas . Also, antenna designs based on metamaterials that have negative permittivity and permeability properties have gained popularity over the past decade because these characteristics can be used to design novel miniature antennas .…”

Section: Introductionmentioning

confidence: 99%

Metamaterial‐inspired series‐fed frequency reconfigurable array with zero‐phase CRLH interconnects

Ijaz

Khan

Asif

et al. 2017

Micro & Optical Tech Letters

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Devices with multiband wireless system capabilities have significantly benefited from the introduction of frequency reconfigurable antennas. However, much of the development on frequency reconfigurable antennas has been on single antenna elements. In this letter, a frequency reconfigurable series‐fed array is presented that has the benefits of broad‐side radiation at two different frequencies. The proposed antenna consists of four reconfigurable dipoles interconnected with reconfigurable zero‐phase composite right‐/left‐handed (CRLH) transmission lines (TLs). PIN diodes are then used to switch between the two measured frequency bands of 2.04–2.18 GHz and 2.44–2.58 GHz. The developed prototype presented here showed a near broadside radiation pattern in both switching bands and a maximum gain of 2.1 dBi was measured in both switching bands. It is shown that instead of meander‐line interconnects between the dipole elements, much more compact frequency reconfigurable CRLH‐TLs can be used.

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Tunable slot antenna using varactors and photodiodes

Cited by 8 publications

References 1 publication

Liquid-Metal-Based Reconfigurable Components for RF Front Ends

Liquid-Metal-Based Reconfigurable Components for RF Front Ends

Frequency-tunable slot antenna using continuous electrowetting of liquid metal

Metamaterial‐inspired series‐fed frequency reconfigurable array with zero‐phase CRLH interconnects

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