Circularly Polarized Proximity Feed Patch Antenna for FMCW Radar

Ghosh, Anindya; Chakravarty, Debashish

doi:10.1109/apusncursinrsm.2019.8888938

Cited by 7 publications

(2 citation statements)

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“…[23][24][25][26][27] On the other hand, the use of metamaterial, periodic structures ultimately introduce the conductor loss and reduces radiation efficiency. 5,[28][29][30][31][32][33][34][35][36][37][38][39][40] Although the antenna radiation characteristics are reported in the above discussed work, time domain characterization is not discussed for the above cases which is very much important for investigating the radiation performance and quality of signal in the near and far field, without this the characterization of Vivaldi antenna remain incomplete. The time domain characterization of the Vivaldi antenna is essential because the pulse spreading, ringing effect degrades the signal to noise ratio and beat error rate in UWB systems.…”

Section: Introductionmentioning

confidence: 99%

Dielectric loaded directive Vivaldi antenna considering dispersion in near and far field

Ghosh

Chakravarty

Chakrabarty

2021

Int J RF Microw Comput Aided Eng

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A "V" slot dielectric loaded antipodal Vivaldi antenna is proposed in this article, which provides significant improvement for directivity, front to back lobe ratio and low side lobe level over the operating frequency band from 1.76 GHz to 10 GHz. Initially, the 35 upward tilted parallel slots are placed along the outer curvy conductor edges of the antenna to maintain the desired radiation performances and impedance matching. Thereafter the V slot extended dielectric slab is integrated with this design for the improvement of radiation performances and pulse spreading effect while maintaining high directivity. The antenna prototype is fabricated and tested which shows the return loss is below the 10 dB, maximum directivity is achieved at 10 GHz which is 17.5 dBi and front-to-back lobe level ratio is 29.2 dB, almost triple as compare to conventional Vivaldi antenna at 9 GHz. The measured results depicts that the highest main lobe squint angle is 2.7 at 6 GHz. In addition to this, the measured system fidelity factor (SFF) is 0.86 and 0.91 at near and far field respectively which confirms that the V slot actually reduces the pulse spreading and dispersion effect while maintaining the high directivity.

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Section: Introductionmentioning

confidence: 99%

Dielectric loaded directive Vivaldi antenna considering dispersion in near and far field

Ghosh

Chakravarty

Chakrabarty

2021

Int J RF Microw Comput Aided Eng

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“…The polarization of an antenna plays an important role in a radar system’s performance in terms of its resolution, accuracy, and sensitivity. Circular polarization (CP) is advantageous because it mitigates the Faraday rotation effect, is independent of orientation between transmitter and receiver antennas and has decreased multi-path interferences [ 35 ]. Moreover, polarization measurement can provide additional information on ice and snow microstructure, such as insights into ice and snow crystal type [ 36 ].…”

Section: Introductionmentioning

confidence: 99%

Low Cost and Compact FMCW 24 GHz Radar Applications for Snowpack and Ice Thickness Measurements

Pomerleau

Royer

Langlois

et al. 2020

Sensors

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Monitoring the evolution of snow on the ground and lake ice—two of the most important components of the changing northern environment—is essential. In this paper, we describe a lightweight, compact and autonomous 24 GHz frequency-modulated continuous-wave (FMCW) radar system for freshwater ice thickness and snow mass (snow water equivalent, SWE) measurements. Although FMCW radars have a long-established history, the novelty of this research lies in that we take advantage the availability of a new generation of low cost and low power requirement units that facilitates the monitoring of snow and ice at remote locations. Test performance (accuracy and limitations) is presented for five different applications, all using an automatic operating mode with improved signal processing: (1) In situ lake ice thickness measurements giving 2 cm accuracy up to ≈1 m ice thickness and a radar resolution of 4 cm; (2) remotely piloted aircraft-based lake ice thickness from low-altitude flight at 5 m; (3) in situ dry SWE measurements based on known snow depth, giving 13% accuracy (RMSE 20%) over boreal forest, subarctic taiga and Arctic tundra, with a measurement capability of up to 3 m in snowpack thickness; (4) continuous monitoring of surface snow density under particular Antarctic conditions; (5) continuous SWE monitoring through the winter with a synchronized and collocated snow depth sensor (ultrasonic or LiDAR sensor), giving 13.5% bias and 25 mm root mean square difference (RMSD) (10%) for dry snow. The need for detection processing for wet snow, which strongly absorbs radar signals, is discussed. An appendix provides 24 GHz simulated effective refractive index and penetration depth as a function of a wide range of density, temperature and wetness for ice and snow.

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