A Study on Small Sensor Node Antenna Performance Camouflaged Under Grassland Fire

Oliveira, Tiago E.; Vala, Mário; Faria, Stefânia; Reis, João R.; Leonor, Nuno; Caldeirinha, Rafael F. S.

doi:10.1007/978-3-030-96466-5_6

Cited by 1 publication

(2 citation statements)

References 14 publications

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“…The enhancement was explained by diffraction phenomena which contributes to the IOP Publishing doi:10.1088/1757-899X/1254/1/012010 2 recovery of the signal. The frequency range (100-180) MHz presented attenuations of (3)(4)(5)(6) dB in outdoor small fires, while the (400-450) MHz range showed an attenuation of (10)(11)(12)(13)(14)(15) dB for the same fire geometry and structure. It was also underlined the role the turbulences of fire have on the apparition of Doppler spread effects of the signals.…”

Section: Introductionmentioning

confidence: 94%

“…Another research vista was the development of antennas for fire propagation studies. Papers [14][15] present designed antennas at 2.4 GHz for early fire detection destined to wireless sensor networks and analysed the influence of fire on antennas radiation pattern. Authors of [16] prepared an experimental setup based on designed wideband antennas in (0.6-8) GHz range to characterize the radio links functioning impairment by small-scale indoor fire.…”

Section: Introductionmentioning

confidence: 99%

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Microwaves propagation through a small fire curtain at 3.55 GHz and 6.26 GHz and the impact on vital signs detection by using a four-element patch antenna array

Miclăuș

Vatamanu²,

Mitran³

et al. 2022

IOP Conf. Ser.: Mater. Sci. Eng.

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The impact of the presence of a fire curtain not wider than 7 cm on an air path 150 cm long of two continuous waves at frequencies of 3.55 GHz and 6.26 GHz was quantified. Two identical patch array antennas with four linear elements were used at emission and reception and they were designed and characterized specifically for this purpose. The magnitude and phase of the transmission coefficient were measured by a vector network analyzer in all the experimental sessions. Comparing the air path and the air-plus-fire path of the waves, it resulted that fire induced shifts in magnitude and phase that depended on frequency and on the experimental setup. The heating of the antenna could have contributed to the overall observed effects. The detection of the human heartbeat by Doppler radar technique was not much influenced by the presence of fire, but the amplitude of the detected beats was increased. The array antennas produced noisy signals for the vital sign detection and the origin of this behaviour was hypothesized.

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