Characterization of 36 Meter Square Mid-Frequency Radio Astronomy Prototype Antenna Array

Farhat, Iman; Cutajar, D.; Adami, Kristian Zarb; Sammut, Charles V.; Abela, John

doi:10.1109/cama.2018.8530622

Cited by 5 publications

(2 citation statements)

References 6 publications

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“…Furthermore, it is capacitively coupled in the longitudinal direction using inter-digital capacitors consisting of 6 fingers at each element end. The array in this form is no longer composed of separated resonant elements but can be considered to be a single antenna periodically fed and backed by a ground plane at a distance of ≈20 mm from the array elements [ 27 ]. The FORA—connected array is linearly polarized and matched to an input impedance of 180

.…”

Section: Methodsmentioning

confidence: 99%

Comparison of Microwave Hyperthermia Applicator Designs with Fora Dipole and Connected Array

Yildiz

Farhat

Farrugia

et al. 2023

Sensors

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In microwave hyperthermia tumor therapy, electromagnetic waves focus energy on the tumor to elevate the temperature above its normal levels with minimal injury to the surrounding healthy tissue. Microwave hyperthermia applicator design is important for the effectiveness of the therapy and the feasibility of real-time application. In this study, the potential of using fractal octagonal ring antenna elements as a dipole antenna array and as a connected array at 2.45 GHz for breast tumor hyperthermia application was investigated. Microwave hyperthermia treatment models consisting of different fractal octagonal ring antenna array designs and a breast phantom are simulated in COMSOL Multiphysics to obtain the field distributions. The antenna excitation phases and magnitudes are optimized using the global particle swarm algorithm to selectively increase the specific absorption rate at the target region while minimizing hot spots in other regions within the breast. Specific absorption rate distributions, obtained inside the phantom, are analyzed for each proposed microwave hyperthermia applicator design. The dipole fractal octagonal ring antenna arrays are comparatively assessed for three different designs: circular, linear, and Cross—array. The 16-antenna dipole array performance was superior for all three 1-layer applicator designs, and no distinct difference was found between 16-antenna circular, linear, or cross arrays. Two-layer dipole arrays have better performance in the deep-tissue targets than one-layer arrays. The performance of the connected array with a higher number of layers exceeds the performance of the dipole arrays in the superficial regions, while they are comparable for deep regions of the breast. The 1-layer 12-antenna circular FORA dipole array feasibility as a microwave hyperthermia applicator was experimentally shown.

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.…”

Section: Methodsmentioning

confidence: 99%

Comparison of Microwave Hyperthermia Applicator Designs with Fora Dipole and Connected Array

Yildiz

Farhat

Farrugia

et al. 2023

Sensors

Self Cite

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“…Aperture arrays are envisioned for both SKA1-LOW (50 to 350 MHz, random configuration) 2,3 and possibly SKA1-Mid phase 2 (400 to 1.45 GHz, regular configuration). [4][5][6] Dishes will be adopted for higher frequencies up to 14 GHz.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the LOFAR-HBA beam patterns using an unmanned aerial vehicle in the near field

Virone

Paonessa

Ciorba

et al. 2021

J. Astron. Telesc. Instrum. Syst.

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Large Horizontal Near-Field Scanner Based on a Non-Tethered Unmanned Aerial Vehicle

Ciorba

Virone

Paonessa

et al. 2022

IEEE Open J. Antennas Propag.

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A horizontal planar scanner with an approximate size of 40 m × 40 m has been implemented using the Unmanned Aerial Vehicle (UAV) technology. The UAV is not wired to the ground to maintain the flexibility and short setup time of a non-tethered flight. In this configuration, the UAV-mounted continuous-wave source is not phase-locked to the on-the-ground receiver. A dual-polarized reference antenna placed on the ground is hence used to retrieve the relevant phase information. The presented approach has been applied on the Pre -Aperture Array Verification System (Pre -AAVS1) of the Square Kilometre Array, which is a digital beamformed array with 16 active elements. An inverse source technique has been applied on measured Near-Field (NF) data acquired on two different sets of points (one for each electric field component) from all the receiver channels. In this way, Embedded Element Patterns (EEPs), array calibration coefficients and pattern have been determined from NF data only. The achieved results have been validated using a complementary set of Far-Field (FF) measurements and simulations.INDEX TERMS Antenna measurements, near-field measurements, unmanned aerial vehicle, digital beamforming array, phased-array radio telescopes, array calibration.

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Characterization of 36 Meter Square Mid-Frequency Radio Astronomy Prototype Antenna Array

Cited by 5 publications

References 6 publications

Comparison of Microwave Hyperthermia Applicator Designs with Fora Dipole and Connected Array

Comparison of Microwave Hyperthermia Applicator Designs with Fora Dipole and Connected Array

Measurement of the LOFAR-HBA beam patterns using an unmanned aerial vehicle in the near field

Large Horizontal Near-Field Scanner Based on a Non-Tethered Unmanned Aerial Vehicle

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