A LHCP Printed Cross Dipole Antenna for Glacial Environmental Sensor Networks

Hashmi, Muhammad Abdur Rehman; Brennan, Paul V.

doi:10.23919/eumc54642.2022.9924499

Cited by 2 publications

(3 citation statements)

References 14 publications

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“…Feasibility of recently reported non-planar/quasi-planar antennas [32], [33], [34], [35], [36], [37], [38], [39] for glacial ESN applications hasn't yet been assessed. Printed spiral and cross dipole antennas for surface RXs including [40], [41], [42] and the one presented in this paper for the Thwaites project haven't been assessed by previous projects. A comparative review of the proposed surface receiver antenna with [40], [41], [42] on the basis of 3 dB axial ratio percentage bandwidth (ARBW), realized gain, and total efficiency is provided in Table 3.…”

Section: E Non-planar/quasi-planar Antennasmentioning

confidence: 99%

“…Printed spiral and cross dipole antennas for surface RXs including [40], [41], [42] and the one presented in this paper for the Thwaites project haven't been assessed by previous projects. A comparative review of the proposed surface receiver antenna with [40], [41], [42] on the basis of 3 dB axial ratio percentage bandwidth (ARBW), realized gain, and total efficiency is provided in Table 3. For achieving ranges above 100 m, previously frequencies lower than 433 MHz were used.…”

Section: E Non-planar/quasi-planar Antennasmentioning

confidence: 99%

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An Antenna Solution for Glacial Environmental Sensor Networks

Hashmi

Brennan

2023

IEEE Access

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Antennas used in glacial environmental sensor networks and reported in the last two decades have been reviewed. A link budget framework for designing such antenna systems is presented and used to design an antenna system for deployment at the Thwaites glacier, Antarctica. Design details of two left hand circularly polarized cross dipole antennas, one for englacial sensor probes and the other for supraglacial surface receivers are presented. The probe antenna is a 3D bent cross dipole that fits within a borehole of 8 cm diameter while providing a 1 dBic gain at 433 MHz in ice. The surface receiver antenna is a planar printed antenna providing a gain of 6.1 dBic with a quarter wave reflector. Both antennas provide 3 dB beamwidths of at least 50 • in the xz and yz vertical planes catering for transmitter-receiver antenna misalignments caused by extended deployments. The antennas displayed good circular polarization and polarization purity traits. The 3 dB axial ratio bandwidths of both the antennas remained 54.9 %. The total efficiencies of the bent cross dipole and the surface receiver antennas were noted as 69.7 % and 86.9 % respectively. Lastly, the 433 MHz band has been validated for achieving englacial communication ranges of up to 2300 metres.INDEX TERMS Englacial sensor probe, link budget framework, cross dipole, glacier monitoring, bent cross dipole, planar printed antenna, 433 MHz frequency, communication through ice, Thwaites project.

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Section: E Non-planar/quasi-planar Antennasmentioning

confidence: 99%

Section: E Non-planar/quasi-planar Antennasmentioning

confidence: 99%

An Antenna Solution for Glacial Environmental Sensor Networks

Hashmi

Brennan

2023

IEEE Access

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“…(1) the high transmit power and correspondingly high detection range enabled by the internal battery in the transmitters (∼60 − 80 m in air and ∼2.5 m in water) and (2) the relatively favourable attenuation properties of UHF radio signals in pure, cold glacier ice (Fujita and others, 2000;Barwick and others, 2005;Martinez and others, 2005;Lewis and others, 2015;Hashmi and Brennan, 2022). These off-the-shelf RFID systems have the potential to be rapidly deployed with a minimum of technical radio-systems knowledge.…”

Section: Introductionmentioning

confidence: 99%

Tracking coarse sediment in an Alpine subglacial channel using radio-tagged particles

Jenkin,

Hofmann,

Hubbard

et al. 2023

J. Glaciol.

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We present a method for tracking radio-tagged pebbles and cobbles through subglacial meltwater channels under shallow temperate glaciers. Natural particles tagged with active radio transmitters were injected directly into a large subglacial channel 300 m up-glacier from the terminus of the Glacier d'Otemma, Switzerland. A roving antenna was developed to localise tagged particles planimetrically in subglacial and proglacial channel reaches (350 and 150 m long, respectively) using a probabilistic technique, delivering records of the change in particle location and transport distance over time with uncertainty. The roving antenna had a ±5−15 m planimetric precision, a 75% particle localisation rate and operated at a maximum ice depth of 47 m. Additionally, stationary supraglacial and proglacial antennas continuously monitored the passage of tagged particles through consecutive reaches of the channel, constraining the timing of particle transport events. The proglacial antenna system had a 98.1% detection rate and was operational to 0.89 m water depth during testing. Roving and stationary antenna records were combined to create a transport distance model for each particle, which may be used in conjunction with hydraulic data to investigate the kinematics of particle motion. When applied at scale in future studies, this method may be used to reveal the mechanisms and timescales of coarse sediment export from Alpine glaciers.

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A LHCP Printed Cross Dipole Antenna for Glacial Environmental Sensor Networks

Cited by 2 publications

References 14 publications

An Antenna Solution for Glacial Environmental Sensor Networks

An Antenna Solution for Glacial Environmental Sensor Networks

Tracking coarse sediment in an Alpine subglacial channel using radio-tagged particles

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