Dual-Linear Polarized Phased Array With 9:1 Bandwidth and 60° Scanning Off Broadside

By Jingni Zhong, Alexander D. Johnson, Elias A. Alwan, John L. Volakis. IEEE Transactions on Antennas and Propagation, 2019

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We present, for the first time, a novel dual-linear polarized tightly coupled dipole array with integrated balun operating across a 9:1 bandwidth, from 2 to 18 GHz. This dual-linear polarized array employs a tightly coupled dipole topology and scans down to 60° from boresight. The overall geometry consists of cross-located tightly coupled dipoles integrated with a folded Marchand balun that serves as an impedance transformer to achieve a wideband feeding network. Notably, the traditional dielectric superstrate is replaced with double layers of frequency selective surfaces to enable scanning down to 60° in both E-, H-, and diagonal (D)-planes across the entire band. The design achieves VSWR < 3 across 2–18 GHz at broadside. This dual-polarized array is also demonstrated to have a good polarization isolation of −20 dB for most of the band. The array’s total height is less than 12 mm (<inline-formula> <tex-math notation="LaTeX">$\lambda _{low}$ </tex-math></inline-formula>/10). The design is validated through fabrication and testing of an <inline-formula> <tex-math notation="LaTeX">$11 \times 11$ </tex-math></inline-formula> prototype. The measurements of this prototype are presented and are in good agreement with simulations.

Subfields: Aerospace Engineering, Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/250941f9555f698486863c6cb606e4a0b34c8ee6