4.7 Article

Circularly Polarized Leaky-Wave Antenna Based on a Dual-Mode Hollow Waveguide

期刊

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 69, 期 9, 页码 6010-6015

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2021.3083783

关键词

Additive manufacturing (AM); circular polarization (CP); dual mode; K-band; leaky waves (LWs); selective laser melting (SLM); slotted waveguide (WG)

资金

  1. European Space Agency [NPI 486-2016]
  2. Rennes Metropole [AIS 17C0481]
  3. European Union through the European Regional Development Fund
  4. Ministry of Higher Education and Research
  5. Brittany and Rennes Metropole through the CPER Project SOPHIE/STIC and Ondes

向作者/读者索取更多资源

This paper presents a compact leaky-wave antenna providing circular polarization from a dual-mode hollow waveguide. The antenna design methodology and measurements show good performance, suitable for space applications.
This communication presents a compact leaky-wave antenna providing circular polarization from a dual-mode hollow waveguide (WG). The monolithic structure is based on a rectangular metallic guide that is perforated with crossed slots. The antenna is fed by a standard WR42 port, which is connected to the leaky WG by a transition that allows for dual-mode excitation. The axial ratio (AR) is determined by the size of the WG section and the dimensions of the crosses. In order to preserve the polarization purity, the geometry of the first radiating elements is modulated. Designed at K-band, the present proposal is suitable for space applications since it relies on a full-metal structure. A design methodology is proposed based on the dual-mode dispersion analysis. Selective laser melting is used to monolithically 3-D print the antenna. Measurements are in good agreement with simulations and the AR is 0.92 dB at 20.5 GHz.

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