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<p>This research presents a new, highly compact, polarisation-agile slotted-waveguide array antenna. The proposed antenna can electronically switch among Horizontal linear, vertical linear, right-handed circular, and left-handed circular polarisation states. Such polarisation-agile antenna design is achieved by employing a hybrid sequential–corporate feed topology for the active polariser plate, resulting in a 37.9% reduction in size compared to a previous design. A fabricated 4-element linear array of the antenna, operated at 2.5&#xa0;GHz, exhibits peak realised gains of 12.91 dBi, 13.53 dBi, 12.55 dBi and 12.89 dBi across the four polarisation states, respectively. In circular polarisation modes, the axial ratio is 1.2&#xa0;dB with cross-polarisation isolation exceeding 45&#xa0;dB. The antenna offers an impedance bandwidth of approximately 55&#xa0;MHz. Designed for scalability within a compact form factor, this antenna is a viable solution for cutting-edge radar and remote sensing systems with stringent size constraints.</p>

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Compact quad-polarisation agile slotted waveguide array antenna with hybrid sequential-corporate feed network for enhanced planar array integration

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  • 出版模式：

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  • 发表日期：

    2026年5月4日

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  • Mandar Chakrabarti,
  • Ayan Chatterjee,
  • Kabita Purkait,
  • Kranthi Kumar Singamaneni

摘要

This research presents a new, highly compact, polarisation-agile slotted-waveguide array antenna. The proposed antenna can electronically switch among Horizontal linear, vertical linear, right-handed circular, and left-handed circular polarisation states. Such polarisation-agile antenna design is achieved by employing a hybrid sequential–corporate feed topology for the active polariser plate, resulting in a 37.9% reduction in size compared to a previous design. A fabricated 4-element linear array of the antenna, operated at 2.5 GHz, exhibits peak realised gains of 12.91 dBi, 13.53 dBi, 12.55 dBi and 12.89 dBi across the four polarisation states, respectively. In circular polarisation modes, the axial ratio is 1.2 dB with cross-polarisation isolation exceeding 45 dB. The antenna offers an impedance bandwidth of approximately 55 MHz. Designed for scalability within a compact form factor, this antenna is a viable solution for cutting-edge radar and remote sensing systems with stringent size constraints.