Numerical investigation of airborne radars for remote sensing applications

Costa, I. F. da; Silva, Luis G. da; Mologni, Juliano Fujioka; Cerqueira, S. Arismar

doi:10.1002/mop.28362

Cited by 3 publications

(2 citation statements)

References 7 publications

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“…With cylindrical near‐field scanning, based on the Nyquist criteria, the sampling steps between two adjacent data points should be no larger than half the wavelength . For example, the cylindrical scanning for XDW‐17‐65A antenna with effective angle of 60° requires 39 slices of measured data in the azimuthal direction, which is 13 times that used here.…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

Rapid low‐cost measurement of base‐station antennas in a compact environment

Lee

Kim³

2015

Micro & Optical Tech Letters

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We propose a low‐cost measurement technique of commercially available base‐station antenna in a compact experimental setting, which may be considerably smaller than the far‐field distance. An α‐variable positioner was utilized with Fresnel‐to‐far‐field transformation method. Compared with conventional near‐field measurements, the technique described here allows for more rapid scanning and transformations. The experimental results show good agreement between the results measured at the far‐field and that found using the Fresnel‐to‐far‐field transformation. The experimental validity for commercial base‐station antenna has been successfully shown for the first time as far as our knowledge, so that the proposed technique can be easily applied in small anechoic chambers, which are typically possessed by small‐/medium‐sized companies. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2617–2622, 2015

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Section: Experimental Setup and Resultsmentioning

confidence: 99%

Rapid low‐cost measurement of base‐station antennas in a compact environment

Lee

Kim³

2015

Micro & Optical Tech Letters

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“…When a radio wave reaches a target, a portion of the wave is absorbed and the rest of it is reflected depending on some properties of the target such as its material. The reflected wave is detected by the radar system and through the information extracted from the reflected wave, specific characteristics of the target are determined [4].…”

Section: Introductionmentioning

confidence: 99%

Dual‐band ridged tapered waveguide slot array antenna with cross‐polarisation reduction

Khorramizadeh¹,

Mallahzadeh²,

Jesri

et al. 2018

IET Microwaves, Antennas & Propagation

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A novel dual‐band waveguide slot array antenna with low cross‐polarisation is proposed. The main structure of the proposed antenna consists of two waveguides in which the top broad wall of the smaller waveguide, a WR‐28 Ka‐band waveguide, is connected to the top broad wall of the larger waveguide, a WR‐90 X‐band waveguide. The WR‐28 waveguide operating in the higher frequency band of the proposed antenna acts as a ridge inside the WR‐90 waveguide operating in the lower frequency band. For achieving a suitable side lobe level (SLL) and cross‐polarisation in the lower frequency band, the slots are placed close to the higher frequency waveguide and side ridges are placed beside each slot. A 2D graph is presented in which the normalised resonance conductance versus the offset of a side ridge from the outer edge of the lower frequency waveguide is shown, while the slot is located between the higher frequency waveguide and the side ridge. By applying proper coefficients to this graph, appropriate offsets from the outer edge of the lower frequency waveguide for the side ridges are obtained so that a low SLL can be realised.

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A dual-band slotted waveguide antenna array for radars applications

Costa

Santos

Patricio

et al. 2015

2015 SBMO/IEEE MTT-S International Microwave and Optoelectronics Conference (IMOC)

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This paper describes the design and fabrication of a novel dual-band slotted waveguide antenna array for radar applications. The radiation structure is composed by two groups of slots, milled into the rectangular waveguide in opposite faces, enabling the antenna operation over two different frequency bands. Using this innovative structure becomes possible to perform diverse sorts of tracking using a unique structure for different radar applications, such as maritime navigation, surveillance and communications. Numerical results were obtained by ANSYS HFSS and measurements demonstrate two operational bandwidths over the S- and C-frequency bands. The antenna gain varies from 14.41dBi to 17.64dBi at 2.25GHz and 4.91GHz, respectively

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Numerical investigation of airborne radars for remote sensing applications

Cited by 3 publications

References 7 publications

Rapid low‐cost measurement of base‐station antennas in a compact environment

Rapid low‐cost measurement of base‐station antennas in a compact environment

Dual‐band ridged tapered waveguide slot array antenna with cross‐polarisation reduction

A dual-band slotted waveguide antenna array for radars applications

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