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<p>In this paper, we present a broadband differential-fed dual-polarized dipole antenna with ultra-wideband harmonic suppression for base-station applications. Two orthogonal folded dipoles with slender stubs are incorporated with a double differential feed scheme for the dual-polarized radiation and harmonic suppression. Four T-shaped parasitic elements are added to the dipoles for the broadband operation. To improve the bandwidth of the harmonic suppression, U-shaped slots, open stubs, and shorted strips are applied to the dipoles. The antenna is realized on a single-layer substrate and directly fed by four 50-<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\Omega \)</EquationSource> </InlineEquation> coaxial cables. The fabricated prototype has an impedance matching bandwidth of 2.49–3.80 GHz, an isolation of <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\ge 44\)</EquationSource> </InlineEquation> dB, and an ultra-wideband harmonic suppression of 4.0–12.6 GHz for reflection coefficients ≥&#xa0;−&#xa0;2.5 dB. Moreover, the broadside dual-polarized radiation is validated by far-field measurements, showing highly symmetrical pattern and low cross-polarization within the operational bandwidth.</p>

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Differential-fed dual-polarized dipole antenna with ultra-wideband harmonic suppression for base-station applications

  • 期刊论文

  • 发表日期：

    2026年7月13日

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  • Hai Dang Le,
  • Son Xuat Ta

摘要

In this paper, we present a broadband differential-fed dual-polarized dipole antenna with ultra-wideband harmonic suppression for base-station applications. Two orthogonal folded dipoles with slender stubs are incorporated with a double differential feed scheme for the dual-polarized radiation and harmonic suppression. Four T-shaped parasitic elements are added to the dipoles for the broadband operation. To improve the bandwidth of the harmonic suppression, U-shaped slots, open stubs, and shorted strips are applied to the dipoles. The antenna is realized on a single-layer substrate and directly fed by four 50- \(\Omega \) coaxial cables. The fabricated prototype has an impedance matching bandwidth of 2.49–3.80 GHz, an isolation of \(\ge 44\) dB, and an ultra-wideband harmonic suppression of 4.0–12.6 GHz for reflection coefficients ≥ − 2.5 dB. Moreover, the broadside dual-polarized radiation is validated by far-field measurements, showing highly symmetrical pattern and low cross-polarization within the operational bandwidth.