Investigation on Frequency Reconfigurability of a Microstrip Patch Antenna Using a Ni-Ti Shape Memory Alloy for an Automatic Fire Sprinkler System

Sumana, L.; Florence, S. Esther

doi:10.1007/s11664-019-07357-6

Cited by 3 publications

(1 citation statement)

References 35 publications

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“…The Ni-Ti SMA in the current study is characterized for determining the transformation temperatures, using differential scanning calorimetry, electrical conductivity using the four-probe method, and the various phases present in the sample using an x-ray diffraction method. 24 SMAs have four characteristics of transformation temperatures. These are martensitic temperatures (start: M s , and finish: M f ) and austenitic temperatures (start: A s , and finish: A f ).…”

Section: Methodsmentioning

confidence: 99%

Pattern Reconfigurable Microstrip Patch Antenna Based on Shape Memory Alloys for Automobile Applications

Sumana¹,

Florence²

2020

Journal of Elec Materi

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A simple realization method for pattern reconfigurable antenna structures based on a shape memory alloy (SMA) is presented here. The proposed antenna is designed for automobile applications for safety, comfort, and commercial usage purposes. It is capable of communicating with neighbouring automobiles and also with roadside units. The patch of the antenna is made up of two-way SMA which comprises of two rectangular patches (patch 1 and patch 2) with antenna dimensions of 74 9 58 mm 2. Upon exciting patch 1 through resistive heating, the antenna generates a tilted beam at an angle of 330°, and similarly for patch 2 at an angle of 30°, thus realizing pattern reconfigurability in the antenna. The operating frequency of the proposed pattern reconfigurable antenna is 2.68 GHz and it radiates with a reflection coefficient (S 11) below À 10 dB. The desired pattern is achieved by training the SMA for the two-way effect. The prototype of the proposed antenna has been designed, fabricated, tested, to validate the experimental results and finally performance have been studied.

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Section: Methodsmentioning

confidence: 99%