A Novel Design Technique for Ultrawideband Shared Aperture Connected Dipole Arrays

Date

2025-07-01

Author

Arda, Kaan
Dural Ünver, Mevlüde Gülbin

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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This paper presents comprehensive circuit models for the design and analysis of ultrawideband shared aperture antenna arrays. A novel semi-analytical approach is developed by modifying the previous equivalent circuit model to enable the calculation of the electromagnetic (EM) transparency of dipole array unit cells. Based on the EM transmission characteristics of the low-band dipole, an accurate circuit-based method is introduced for calculating the input impedance of a shared aperture antenna. Notably, the only full-wave simulation required is that of the standalone high-band antenna. To demonstrate the effectiveness of the proposed technique, two distinct shared aperture dipole array designs are presented. In both cases, the high-band antennas are implemented using tightly coupled dipole array (TCDA) elements. The first design achieves a 26.2:1 impedance bandwidth with active VSWR < 2.3 and a low-profile height of (Formula presented.), where (Formula presented.) denotes the free-space wavelength at the lowest operating frequency. The second design achieves a 33.3:1 bandwidth with active VSWR < 3 and a profile height of just (Formula presented.). The average total efficiencies of the two designs are 0.86 and 0.85, respectively.

Subject Keywords

broadband dipole array, EM transparency, equivalent circuit model, shared aperture antenna array

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https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=105009867832&origin=inward
https://hdl.handle.net/11511/115246

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Department of Electrical and Electronics Engineering, Article