Citation :

Manasa K R, Pramod Kumar Naik, Shashi Kumar D, "Shared Aperture Quad-Band Antenna Configuration for 5G Sub-6 GHz and Emerging Mid-Band Scenarios," International Journal of Electronics and Communication Engineering, vol. 13, no. 7, pp. 203-213, 2026. Crossref, https://doi.org/10.14445/23488549/IJECE-V13I7P114

Abstract

A novel space-efficient shared-aperture antenna supporting quad-band is proposed for modern wireless and emerging 5G applications. The antenna operates at 2.1 GHz, 2.4 GHz, 3.7 GHz, and 7.8 GHz, targeting key bands such as Band 1/n1, ISM, n77/n78, and n258 extension. Each band is supported by a uniquely scaled octa-star radiating element, formed by overlapping two square patches rotated by 45°, enabling frequency-specific impedance matching and spatial isolation. The novelty of the proposed design lies in the integration of four independently scaled octa-star radiating elements within a shared aperture to achieve compact quad-band operation with high inter-band isolation. An equivalent circuit model abstracts the resonant behavior of each antenna using parallel RLC networks and shared feed components. Simulated and measured results show excellent impedance matching with reflection coefficients of –39.39 dB, –37.94 dB, –29.91dB, and –31.69 dB, and VSWR values close to unity at 2.1 GHz, 2.4 GHz, 3.7 GHz, and 7.8 GHz, respectively. Similarly, the peak gains of 3.62 dBi, 4.22 dBi, 4.34 dBi, and 7.87 dBi are achieved across the respective bands. Inter-band isolation remains below –30 dB, reaching –66.71 dB in some cases. The proposed antenna offers a scalable, fabrication-friendly solution for integration into 5G-enabled devices, IoT gateways, and compact wireless platforms requiring multiband operation within a single aperture.

Keywords

Shared-aperture antenna, Quad-band operation, Octa-star patch, 5g Communication, Sustainable electronics.

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