Dual-polarized inverted quad-ridged flared horn antenna with one decade bandwidth for OTA testing

Xue Zhang, Zhengpeng Wang, Chong Pan, Xinran Ba, Yi Wang

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This paper presents a dual-polarization inverted quad-ridged flared horn antenna with an extremely wideband of more than one decade in the range of 2-20 GHz. The modes of the inverted quad-ridged waveguide are analyzed first. A cross-shaped inverted ridge, with low TE11 mode cutoff frequency and a tip significantly higher than the horn aperture, is proposed. The inner surface of the horn wall is based on a composite curve flare rate. It is optimized to cooperate with the inverted ridge. Furthermore, the PTFE back cavity replaces metal back cavity to suppress the high order mode in the back cavity. The measured isolation between the two orthogonal linearly-polarized ports is nearly 45 dB and the reflection coefficient is less than -15 dB over the entire working frequency band.
Original languageEnglish
Pages (from-to)1233-1237
JournalIEEE Antennas and Wireless Propagation Letters
Issue number6
Early online date25 Mar 2022
Publication statusE-pub ahead of print - 25 Mar 2022


  • Antenna radiation patterns
  • Bandwidth
  • Cutoff frequency
  • Frequency measurement
  • Horn antennas
  • Probes
  • Reflection coefficient


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