A Wide Coverage S-Band Array with Dual Polarized Connected Bowtie Antenna Elements

et al. 2021

IEEE Access

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A low-profile and wide-scan phased-array antenna of connected cross-bowtie elements is proposed. The design goals and considerations are based on the applications requiring the integration of a large array antenna with composite sandwich structures, such as antennas on aircraft. In a very large array environment (modelled approximately as an infinite array), the main beam of the proposed antenna can be steered up to ±75°at azimuth and ±15°at elevation over bandwidths of 10% and 25% with active reflection coefficients below −10 dB and −5 dB, respectively. A Monte Carlo analysis of critical manufacturing and alignment tolerances shows the desired performance is achieved with the cumulative distribution probability over 80% under the uniformly distributed random combinations of the tolerances. Experimental results of a 7×7 element array prototype agree well with the simulations of this small-scale array case. The experiments show that this small-scale prototype is capable of steering the beam within the range of [−60°, 60°] at azimuth and [−15°, 15°] at elevation with the predicted performance satisfying the targeted application requirements and mechanical constraints. The achieved combination of the wide beam steering performance, relatively low antenna profile, and suitability of its feeding structure for sandwiched electro-mechanical integration makes this design unique with respect to the previously published results.INDEX TERMS Bowtie antenna, composite sandwich structure, connected array, fuselage integration, phased array.

Section: Antenna Designmentioning

confidence: 98%

Section: Antenna Designmentioning

confidence: 99%

A Wide Scanning Array of Connected Bowtie Antennas Suitable for Integration in Composite Sandwich Structures With Monte-Carlo Tolerance Analysis

Khanal¹,

et al. 2021

IEEE Access

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“…2 shows the antenna array assembly for an example of a 3×3 connected cross-bowtie antenna elements. The antenna element is based on the previous cross-bowtie antenna element design which operates at S-band [5]. Simple geometrical scaling of the antenna element from S-band to X-band is not possible to realize.…”

Section: Introductionmentioning

confidence: 99%

Feasibility Study of a Wide Coverage Dual-Polarized Phased Array Antenna at 10 GHz

Khanal

2021 International Symposium on Antennas and Propagation (ISAP)

2021

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“…ANTENNA DESIGN Fig. 1 shows the array antenna under study, which has been proposed in [9] and designed through the infinite array approach in CST Studio Suite. It is a horizontally polarized Sband (3 GHz) array consisting of 20 × 200 (vertical× horizontal) Bowtie antenna elements.…”

Section: Introductionmentioning

confidence: 99%

“…In comparison with the original element design in [9], we have introduced the shoulders at the edges of the Bowtie arms to further increase the desired scan performance (|Γ act | <-10 dB) in the E-plane from ±75 • to ±80 • for the infinitely large array. Furthermore, the element spacing for the present design in both the E-and H-planes is 38 mm (i.e.…”

Section: Introductionmentioning

confidence: 99%

Edge Truncation Effects in a Wide-Scan Phased Array of Connected Bowtie Antenna Elements

Khanal

2020 14th European Conference on Antennas and Propagation (EuCAP)

et al. 2020

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Edge truncation effects are critical when designing a phased array, as these can lead to the variation of the active antenna impedance and radiation pattern between individual array elements. This paper investigates edge truncation effects in an array of connected Bowtie antenna elements that has been initially designed through an infinite array approach. This design represents a novel implementation of the connected-array concept that offers a wide-scan performance with up to ± 80 • scan range in the E-plane (in the infinite array). The goal of this study is to estimate the minimum size of a realistic finite array of such connected Bowtie antennas.