Quad-mode antenna for wide-scan sparse arrays

Prinsloo, D.S.; Meyer, P.; Maaskant, Rob; Ivashina, Marianna

doi:10.1109/aps.2015.7305147

Cited by 6 publications

(5 citation statements)

References 4 publications

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“…The QMA is a four‐element quad‐mode antenna, fed with quadraxial transmission lines, which achieves near hemispherical coverage . The transmission lines flare into two bow‐tie antennas printed on a plane, atop a conical shielding, as seen in Figure .…”

Section: Matching Techniques and Application To Qmamentioning

confidence: 99%

“…The transmission lines flare into two bow‐tie antennas printed on a plane, atop a conical shielding, as seen in Figure . In Reference , the QMA is designed at a center frequency of f = 950 MHz with an operating frequency bandwidth of approximately 35%. A next phase however, is done at f = 5.5 GHz.…”

Section: Matching Techniques and Application To Qmamentioning

confidence: 99%

“…The QMA is a four-element quad-mode antenna, fed with quadraxial transmission lines, which achieves near hemispherical coverage. 9 The transmission lines flare into two bow-tie antennas printed on a plane, atop a conical shielding, as seen in Figure 3. In Reference 9, the QMA is designed at a center frequency of f = 950 MHz with an operating frequency bandwidth of approximately 35%.…”

Section: Mathematical Signal and Noise Response Modelsmentioning

confidence: 99%

“…These systems use radiating elements which can each operate in different modes, where each mode is generated by a unique excitation, and displays a unique radiation pattern and input impedance. An example of such an element is the quad‐mode antenna (QMA) presented in References . Many of the standard techniques for instance assume identical radiators, whereas the radiation patterns of a multimode element are completely different from each other.…”

Section: Introductionmentioning

confidence: 99%

“…This article, for the first time, investigates the noise matching characteristics of a scanned QMA, using nonideal simulation data to represent all four modes of the antenna. The standard procedures of matching to the active impedance at a certain scan angle, and matching to the self‐impedance, are investigated.…”

Section: Introductionmentioning

confidence: 99%

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On techniques for optimal noise matching of a class of multimode antenna

Kenned

Meyer

2019

Int J RF Microw Comput Aided Eng

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This article investigates techniques to design noise‐matching networks for a class of multimodal antennas, specifically, the so‐called quad‐mode antenna. Such an antenna utilizes weighted combinations of four very dissimilar radiation patterns, and different modal input impedances, which vary across scan angle. The matching problem is therefore quite different from that of a classical array, where antenna elements are normally assumed to be similar. In addition to the standard techniques, a new, recursively averaged active impedance, is proposed and applied, as well one using a noise‐active impedance, and two optimization approaches. It is shown for the first time that the quad‐mode antenna displays excellent noise properties, with the simplest technique, namely that of matching to the self‐impedances, producing noise performances across all scan angles which are almost as good as the best solution found by all the techniques.

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Section: Matching Techniques and Application To Qmamentioning

confidence: 99%

Section: Matching Techniques and Application To Qmamentioning

confidence: 99%

Section: Mathematical Signal and Noise Response Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations