Sidelobe Modification for Reflector Antennas by Electronically Reconfigurable Rim Scattering

Ellingson, S.W.; Sengupta, Rimi

doi:10.1109/lawp.2021.3072536

Cited by 10 publications

(10 citation statements)

References 9 publications

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“…However, there may be multiple angles that we wish to null. Further, as we will show later, nulling a particular angle may cause small changes to the main lobe gain (this was also shown in [5]). This variation may be tolerable in some applications, but in radio astronomy it can be a significant problem [2].…”

Section: B Main Lobe Variation and Nulling Multiple Anglessupporting

confidence: 52%

“…The antenna system assumed in this paper is presented in Figure 1. Following the development in [5] we assume the equivalence of transmit and receive patterns and calculate the transmit patterns using physical optics (PO). The total electric field intensity E s scattered by the reflector in the far-field direction ψ is given by 2…”

Section: System Modelmentioning

confidence: 99%

“…Recently, another approach for cancelling (or generally modifying) the sidelobe(s) of a reflector antenna pattern has been proposed that uses reconfigurable rim scattering [5]. In that work it was shown that by using reconfigurable segments along the rim of a refletor antenna that introduce phase shifts to the reflected signal, sidelobe patterns can be altered and even cancelled.…”

Section: Introductionmentioning

confidence: 99%

“…That work examined prime focus-fed circular axisymmetric paraboloidal reflectors, although the concept is not limited to that type of system. Specifically, it was shown in [5] that as long as sufficient surface area along the rim is reconfigurable, sidelobe cancellation is possible. Additionally, the work showed that cancellation did not require continuously variable phase, but was in fact possible using quantized phase shifts (viz., binary or quaternary).…”

Section: Introductionmentioning

confidence: 99%

“…In the current work we build on the idea proposed in [5] by describing algorithms for determining the weights needed to cancel sidelobes at specific angles from the reflector axis in an open-loop fashion. More specifically, we first derive the optimal weights needed to cancel sidelobes at an arbitrary angle ψ.…”

Section: Introductionmentioning

confidence: 99%

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Weight Selection for Pattern Control of Paraboloidal Reflector Antennas with Reconfigurable Rim Scattering

Buehrer¹,

Ellingson²

2022

Preprint

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It has been recently demonstrated that modifying the rim scattering of a paraboloidal reflector antenna through the use of reconfigurable elements along the rim facilitates sidelobe modification including cancelling sidelobes. In this work we investigate techniques for determining the unit-magnitude weights (i.e., weights which modify the phase of the scattered signals) to accomplish sidelobe cancellation at arbitrary angles from the reflector axis. Specifically, it is shown that despite the large search space and the non-convexity of the cost function, weights can be found with reasonable complexity which provide significant cancellation capability. First, the optimal weights without any magnitude constraints are found. Afterwards, algorithms are developed for determining the unit-modulus weights with both quantized and unquantized phases. Further, it is shown that weights can be obtained that both cancel sidelobes while providing a constant main lobe gain. A primary finding is that sufficiently deep nulls are possible with essentially no change in the main lobe with practical (binary or quaternary) phase-only weights.

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Section: B Main Lobe Variation and Nulling Multiple Anglessupporting

confidence: 52%

Section: System Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations