The application of taylor weighting, digital phase shifters, and digital attenuators to phased-array antennas.

Brock, Billy C.

doi:10.2172/932884

Cited by 18 publications

(4 citation statements)

References 2 publications

(4 reference statements)

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“…AF Ry =e j (12) In ( 7)-( 8) and ( 11)- (12), 𝜓 x =kdsin𝜃cos𝜙 and 𝜓 y =kdsin𝜃sin𝜙 with 𝜃 and 𝜙 are the elevation and azimuth angles, respectively. The number of elements being excited with the weight w 2 , in x-and y-directions of both transmit and receive modes of operation are given by ( 13) and (14), respectively.…”

Section: B Planar Arraymentioning

confidence: 99%

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Design of Linear and Planar Arrays With Low Sidelobe Levels and High Directivity Using Two-Way Array Factor

Rajender,

Choudhury,

Subhashini

et al. 2024

IEEE Trans. Antennas Propagat.

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Sidelobes in the two-way radiation pattern are of serious concern in a radar array. Several techniques have evolved to mitigate the problem, which include amplitude tapering, Genetic Algorithm (GA) optimization, thinning transceiver aperture, and two-weight amplitude distribution. With such optimization schemes, the sidelobes can be considerably suppressed but at the cost of a reduction in directivity or taper efficiency. Further, such amplitude tapers require a complex feeding network design. This work alleviates such design restrictions and proposes a systematic approach to lower the sidelobes in radar two-way shared aperture arrays. The proposed methodology can achieve a sidelobe level (SLL) of below -52 dB in both linear and planar arrays, which is about 18 dB enhancement in SLL compared with uniform transmit and thinned receive arrays. In addition, as a result of the equal transceiver array size in the proposed design, an improvement of approximately 0.44 dB and 0.68 dB in directivity is achieved in linear and planar arrays, respectively. A novel feeding architecture is also illustrated to reduce the cost and complexity of the overall feeding network. A set of full-wave simulations have also been performed to validate the theoretical results.

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Section: B Planar Arraymentioning

confidence: 99%

“…on the two-way array pattern is of foremost importance [11]. Even though the concept of the two-way array factor was prominent from the 1990s [12], [13], it was not considered for reducing the SLLs of a radar array until 2008 [14].…”

Section: Introductionmentioning

confidence: 99%

Design of Linear and Planar Arrays With Low Sidelobe Levels and High Directivity Using Two-Way Array Factor

Rajender,

Choudhury,

Subhashini

et al. 2024

IEEE Trans. Antennas Propagat.

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“…In order to decrease the SLL further than what can be achieved by calibration alone, a taper can be applied. A popular taper to use is the Taylor taper [16]. The taper choice is free from the calibration choice.…”

Section: B Tapering In Combination With Calibrationmentioning

confidence: 99%

Near-Field Calibration Methods for Integrated Analog Beamforming Arrays and Focal Plane Array Feeds

Budé,

Van Hastenberg,

Johannsen

et al. 2023

IEEE Open J. Antennas Propag.

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Active millimeter-wave beamforming arrays and focal plane array antennas require extensive calibration to compensate for impairments, such as phase and gain variations between elements, as well as unintended coupling between changes in gain and phase. When far-field calibration methods are used for calibrating focal plane array antennas, the required size of the anechoic chamber is exceedingly large. For this reason, a near-field calibration method for millimeter-wave analog beamforming array antennas and focal plane array antennas is proposed. Nonidealities of the beamformer integrated circuits with vector modulators are taken into consideration, and a way to reduce the measurement set for vector modulators with high resolution is proposed. This method is both practical and achieves a good calibration as evidenced by measurements of the radiation patterns, and it is suitable for use in an automated factory calibration setup. The important trade-off between the radiated power and side-lobe level is highlighted.

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“…16. Two cases are illustrated: uniform illumination, and an -bar Taylor taper for SLL of 25 dB, designed per [18]. Assuming a lossless feed network, the realized gain of this array at boresight is 20.6 dBi, with a scan loss of 1.4 dB out to 30 .…”

Section: Larger Microstrip Patch Espar Arraysmentioning

confidence: 99%

A Low-Cost 2 <formula formulatype="inline"> <tex Notation="TeX">$\times$</tex> </formula> 2 Planar Array of Three-Element Microstrip Electrically Steerable Parasitic Array Radiator (ESPAR) Subcells

Luther

Ebadi

Gong

2014

IEEE Trans. Microwave Theory Techn.

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A low-cost electrically scanned phased array utilizing microstrip patch electrically steerable parasitic array radiator (ESPAR) subarray cells is presented for the first time. Four single-layer three-element ESPAR subarray cells at one-wavelength spacing are uniformly illuminated by a corporate feed network consisting of microstrip Wilkinson power dividers and ring hybrids. The array is scanned using a combination of ESPAR capacitive mutual coupling control and microstrip switched delay line phase shifters at the subarray level to achieve a scanning range from 20 to 20 while maintaining high return loss. The ESPAR coupling technique allows a 50% reduction in the number of phase shifters used by utilizing a full wavelength subcell spacing, resulting in excellent performance with inexpensive fabrication. The fabricated prototype exhibits boresight gain of 12.1 dBi with low scan loss and 7.0-dB worst case sidelobe level. The array is compared quantitatively to thinned arrays with and without parasitic elements to illustrate this advantageous technique. A functional prototype is fabricated and measured and is aptly predicted by the full-wave model.Index Terms-Antenna feed circuits, array antenna theory, beam forming, L-band, microstrip antennas, microwave circuits, phased arrays.

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The application of taylor weighting, digital phase shifters, and digital attenuators to phased-array antennas.

Cited by 18 publications

References 2 publications

Design of Linear and Planar Arrays With Low Sidelobe Levels and High Directivity Using Two-Way Array Factor

Design of Linear and Planar Arrays With Low Sidelobe Levels and High Directivity Using Two-Way Array Factor

Near-Field Calibration Methods for Integrated Analog Beamforming Arrays and Focal Plane Array Feeds

A Low-Cost 2 <formula formulatype="inline"> <tex Notation="TeX">$\times$</tex> </formula> 2 Planar Array of Three-Element Microstrip Electrically Steerable Parasitic Array Radiator (ESPAR) Subcells

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