Orthogonally Dual-Polarized Leaky-Wave Antenna for Endfire Radiation Based on Periodical Loading

Jianfeng Chen, Wei Yuan, Wen Xuan Tang, Lei Wang, Qiang Cheng*, Tie Jun Cui

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We propose a dual-polarized leaky-wave antenna (LWA) with orthomode based on a metallic square waveguide for broadband endfire radiation applications. Several double-sided slots acting as radiation elements are notched on the waveguide to produce an endfire pattern. To overcome the restriction associated with the endfire radiation condition of a linear array, a metallic core periodically loaded with pins is used to control the dispersion of the proposed double-sided-slot waveguide. By optimizing the height distribution of the loading pins along the longitudinal direction using a cosine function, stable endfire radiation can be achieved over a broad operating band. Moreover, dual-polarized radiation can be automatically implemented because of the rotational symmetry of the proposed LWA. Furthermore, two rectangular waveguides connected with a square waveguide are used as the orthomode transducer (OMT) of the proposed LWA. The numerical and experimental results verify that dual-polarized endfire radiation is achieved in the frequency range of 7.6-9.1 GHz with an isolation of higher than 45 dB. The realized gain achieved is in the range of 13-15 dBi with a cross-polarization level of below-30 dB.

Original languageEnglish
Pages (from-to)835-845
Number of pages11
JournalIEEE Transactions on Antennas and Propagation
Volume70
Issue number2
Early online date15 Sep 2021
DOIs
Publication statusPublished - Feb 2022

Keywords

  • Dual polarization
  • Endfire antenna
  • Fabrication tolerance
  • Leaky-wave antenna (LWA)
  • Orthomode

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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