Circular Quadruple-Ridged Flared Horn Achieving Near-Constant Beamwidth Over Multioctave Bandwidth: Design and Measurements

Akgiray, Ahmed; Weinreb, S.; Imbriale, W.; Beaudoin, Christopher

doi:10.1109/tap.2012.2229953

Cited by 98 publications

(67 citation statements)

References 16 publications

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“…(2R À d)/(2R) is much larger. It is also evident from Figure 14 that the ridge gap d has much more influence on the cut-off wave numbers of TE 11 and TE 21L than does ridge thickness W, which is consistent with those of quadruple ridged circle waveguide in [12]. When the ridge is heavily loaded (ridge gap d is small) for both W = 0.15 and W = 0.30, the cut-off wave numbers of TE 31 and TE 01 are inclined to be the identical value.…”

Section: Numerical Resultssupporting

confidence: 75%

Isogeometric analysis with trimming technique for quadruple arch‐cut ridged circle waveguide

Liu

Lin

et al. 2016

Int J Numerical Modelling

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The conventional non‐uniform rational B‐spline (NURBS)‐based isogeometric analysis (IGA) preserves the exact description of geometrical shapes and significantly improves the computational accuracy, but suffers from the topological limitations of a single intact NURBS patch in the parameter space, which renders IGA to be applied in complex topology like the ridged structure inconvenient. In this present work, trimming technique which is the isogeometric approach for handling two‐dimensional topologically complicated geometry with a single patch is employed to demonstrate how this issue can be resolved, and further extended to analyze the quadruple arch‐cut ridged circular waveguide. The main benefit of the proposed approach is that only one patch is sufficient to represent the complex two‐dimensional topology such as circular or any degrees of polygonal shapes. Because the finite element constituents of the trimmed elements are calculated and mapped into underlying global control variables by remodeling the trimmed elements as a single patch, various properties of conventional IGA are maintained. Numerical example illustrates the flexibility for describing complicated two‐dimensional domain, and high computational accuracy and efficiency of present method with much less degree of freedom compared to commercial finite‐element software package. Effects of arch‐cut ridge dimensions on the cut‐off wave numbers of modes are investigated in details. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Numerical Resultssupporting

confidence: 75%

Isogeometric analysis with trimming technique for quadruple arch‐cut ridged circle waveguide

Liu

Lin

et al. 2016

Int J Numerical Modelling

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“…The results show that the TE 11 mode is dominant at the lower band, but drops gradually towards higher frequency, where TE 12−13 and TM 11−13 are increasing. At high frequencies, the two major modes TE 11 and TM 11 show different proportions compared with the analysis in [7]. For the Band B, the TE 11 content drops to less than 10 % while TM 11 rises to 30 %.…”

Section: B Aperture Mode Contentmentioning

confidence: 71%

Wideband single pixel feed system over 4.6–24 GHz for the Square Kilometre Array

Flygare

Dong

Yang

et al. 2019

2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)

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We present the Band B feed system over 4.6-24 GHz designed for the Square Kilometre Array (SKA) reflector for radio astronomy applications. The feed is a Quad-ridge Flared Horn (QRFH) with a customized shape based on spline-defined profiles to achieve improved wideband performance. The feed system shows high aperture efficiency and sensitivity on the SKA reflector in predictions based on measured feed beam patterns. We present the feed design overview, cryogenic dewar concept and measurement of receiver noise (10-20 K) with wideband lownoise amplifiers, and full system simulation of the performance.Index Terms-quad-ridge flared horn, ultra-wideband feed, spine-defined profile, radio astronomy, sensitivity.

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“…Finally, it is shown in [16] that the quad-ridge horn is a flare-angle limited horn which implies that the beamwidth of the horn is primarily determined by the flare angle (see Figure 2). As a consequence of this, the ridge profile must be chosen such that desired flare angle can be realized.…”

Section: B Profile Of Ridges and Sidewallmentioning

confidence: 99%

“…First, the ridges lower the cutoff frequency of the dominant waveguide mode by as much as factor of four [5]. This is the reason the quadridge horn can operate over multi-octave bandwidths with the dominant mode staying above cutoff (and in fact staying as the dominant mode throughout the frequency range for the circular QRFH [16]). In particular, T E 11 cutoff frequency in a hollow circular waveguide with a radius of 27.395 millimeters (the same radius as the circular QRFH we present herein) is 3.21 GHz whereas CST MWS simulations reveal a cutoff frequency of 0.85 GHz when the same waveguide is heavily ridge loaded.…”

Section: A Ridgesmentioning

confidence: 99%

Ultrawideband square and circular quad-ridge horns with near-constant beamwidth

Akgiray

Weinreb

2012

2012 IEEE International Conference on Ultra-Wideband

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Two quadruple-ridged, flared horns, one with circular aperture and the other with square aperture, are presented achieving nearly constant beamwidth and excellent return loss over 6:1 and 4:1 frequency bandwidths, respectively, are presented. The circular and square quad-ridge horns are designed with nominal 10 dB beamwidths of 85 and 140 degrees, respectively. Radiation pattern measurements show excellent beamwidth stability in φ = 0, 45 degree planes for both horns. Measured return loss is > 10 dB over the entire band for the circular quad-ridge horn and much better for 85% of the frequency band. The square quad-ridge horn also has return loss ≥ 15 dB over much of the target frequency range. To the best knowledge of the authors, these horns are the first demonstrations of ultrawideband reflector antenna feeds with near-constant beamwidth which can accommodate widely different optical configurations.

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Circular Quadruple-Ridged Flared Horn Achieving Near-Constant Beamwidth Over Multioctave Bandwidth: Design and Measurements

Cited by 98 publications

References 16 publications

Isogeometric analysis with trimming technique for quadruple arch‐cut ridged circle waveguide

Isogeometric analysis with trimming technique for quadruple arch‐cut ridged circle waveguide

Wideband single pixel feed system over 4.6–24 GHz for the Square Kilometre Array

Ultrawideband square and circular quad-ridge horns with near-constant beamwidth

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