scholarly journals An Electrically Actuated Liquid-Metal Gain-Reconfigurable Antenna

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
George B. Zhang ◽  
Ryan C. Gough ◽  
Matthew R. Moorefield ◽  
Kareem S. Elassy ◽  
Aaron T. Ohta ◽  
...  
Keyword(s):  
Liquid Metal ◽  
Duty Cycle ◽  
Reconfigurable Antenna ◽  
Antenna Gain ◽  
Electrically Actuated ◽  
External Power ◽  
5 Ghz ◽  
Metal Antenna

A tunable liquid-metal antenna demonstrating gain reconfigurability is presented. This antenna uses a reconfigurable stub made with the liquid metal Galinstan. Using continuous electrowetting, a 60 Hz signal with an amplitude of 1 Vpp and 75% duty cycle can actuate the Galinstan continuously along a channel, tuning the stub length and antenna gain. Zero external power is required to maintain the position of the slug. The 5 GHz antenna offers more than 10 dB of analog gain tuning, from −5.90 to 4.43 dB.

scholarly journals The Design and Manufacturing Process of an Electrolyte-Free Liquid Metal Frequency-Reconfigurable Antenna

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1793
Author(s):  
Peng Qin ◽  
Lei Wang ◽  
Tian-Ying Liu ◽  
Qian-Yu Wang ◽  
Jun-Heng Fu ◽  
...  
Keyword(s):  
Thermal Expansion ◽  
Liquid Metal ◽  
High Vacuum ◽  
Effective Bandwidth ◽  
Reconfigurable Antenna ◽  
Tunable Range ◽  
Process Route ◽  
Protective Gas ◽  
Frequency Reconfigurable Antenna ◽  
Metal Antenna

This communication provides an integrated process route of smelting gallium-based liquid metal (GBLM) in a high vacuum, and injecting GBLM into the antenna channel in high-pressure protective gas, which avoids the oxidation of GBLM during smelting and filling. Then, a frequency-reconfigurable antenna, utilizing the thermal expansion characteristic of GBLM, is proposed. To drive GBLM into an air-proof space, the thermal expansion characteristics of GBLM are required. The dimensions of the radiating element of the liquid metal antenna can be adjusted at different temperatures, resulting in the reconfigurability of the operating frequency. To validate the proposed concept, an L-band antenna prototype was fabricated and measured. Experimental results demonstrate that the GBLM in the antenna was well filled, and the GBLM was not oxidized. Due to the GBLM being in an air-proof channel, the designed liquid metal antenna without electrolytes could be used in an air environment for a long time. The antenna is able to achieve an effective bandwidth of over 1.25–2.00 GHz between 25 °C and 100 °C. The maximum radiation efficiency and gain in the tunable range are 94% and 2.9 dBi, respectively. The designed antenna also provides a new approach to the fabrication of a temperature sensor that detects temperature in some situations that are challenging for conventional temperature sensing technology.

Liquid metal antenna-based pressure sensor

2019 ◽  
Vol 28 (2) ◽  
pp. 025019
Author(s):  
Xiaoping Zhou ◽  
Yi He ◽  
Jie Zeng
Keyword(s):  
Liquid Metal ◽  
Pressure Sensor ◽  
Metal Antenna

Reconfigurable Antenna

2016 ◽  
pp. 237-263
Author(s):  
Mohamad Kamal A Rahim ◽  
Huda A. A. Majid ◽  
Mohamad Rijal Hamid
Keyword(s):  
Communication Systems ◽  
Low Cost ◽  
Wireless Systems ◽  
Reconfigurable Antennas ◽  
Effective Length ◽  
Slot Antenna ◽  
Wireless Communication Systems ◽  
Reconfigurable Antenna ◽  
5 Ghz ◽  
Narrow Bands

Reconfigurable antennas have attracted a lot of attention especially in future wireless communication systems. Superior features such as reconfigurable capability, low cost, multi-purpose functions and size miniaturization have given reconfigurable antennas advantage to be integrated into a wireless systems. In this chapter, two types of reconfigurable antennas are discussed. First, frequency reconfigurable narrowband microstrip slot antenna (FRSA) is presented. The proposed antenna is designed to operate at six reconfigurable frequency bands from 2 GHz to 5 GHz with bidirectional radiation pattern. The second antenna design is frequency reconfigurable narrowband patch-slot antenna (FRPSA) is presented. The antenna is a combination of a microstrip patch and slot antenna. Nine different narrow bands are produced by tuning the effective length of the slot. The performances of the antenna in term of simulated and measured results are presented. In conclusion, good agreement between the simulated and measured results has been attained.

Pixelated dual‐dipole antenna using electrically actuated liquid metal

2019 ◽  
Vol 55 (19) ◽  
pp. 1032-1034 ◽  
Author(s):  
K.J. Sarabia ◽  
A.T. Ohta ◽  
W.A. Shiroma
Keyword(s):  
Liquid Metal ◽  
Dipole Antenna ◽  
Electrically Actuated

DESIGN AND CHARACTERIZATION OF THE LIQUID METAL ANTENNA OPTIMALLY EMBEDDED IN CONCRETE BEAM PROTOTYPE AS AN ALTERNATIVE STRAIN SENSOR

2016 ◽  
Vol 78 (5-9) ◽  
Author(s):  
Edmon O. Fernandez ◽  
Ira Valenzuela ◽  
John William Orillo
Keyword(s):  
Liquid Metal ◽  
Resonant Frequency ◽  
Concrete Beam ◽  
Microfluidic Channel ◽  
Strain Sensor ◽  
Concrete Specimen ◽  
Dipole Antenna ◽  
Loading Tests ◽  
Basic Characteristics ◽  
Metal Antenna

This paper presents the implementation of the novel dipole liquid metal antenna as an alternative strain sensor when embedded in the optimal location of a concrete beam prototype. The antenna is made up of eutectic Indium Gallium, a fluid metal alloy, encased in a microfluidic channel, namely, polydimethylsiloxane (PDMS) elastomer fabricated using McGyver-esque technique to microfabrication. The fluidic dipole antenna being highly flexible, stretchable, and reversibly deformable mimics the basic characteristics of the strain sensor where its resonant frequency is inversely related to its length. The concrete specimen was subjected to center – point loading tests where the resonant frequency of the liquid antenna embedded in it was measured simultaneously. Statistical analysis of the results show that there is a significant relationship between the displacement of the concrete specimen and the resonant frequency of the embedded antenna.

scholarly journals An Electrically Actuated DC-to-11-GHz Liquid-Metal Switch

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 1261-1266 ◽  
Author(s):  
Matthew R. Moorefield ◽  
Ryan C. Gough ◽  
Aaron T. Ohta ◽  
Wayne A. Shiroma
Keyword(s):  
Liquid Metal ◽  
Electrically Actuated
Sign in / Sign up

Export Citation Format

Share Document