Axial Ratio Enhancement of a Single-Layer Microstrip Reflectarray

Roger Lorenzoni Farias,Custodio Peixeiro,Marcos V. T. Heckler,Edson R. Schlosser

IEEE Antennas and Wireless Propagation Letters（2019）SCI 2区

Univ Lisbon

被引用9|浏览4

摘要

This letter presents a new approach for the enhancement of the axial ratio (AR) of a single-layer circularly polarized reflectarray antenna based on a circular microstrip patch with phase delay-line stubs unit cell. The AR improvement is achieved by inserting insets around the two stubs, changing the orientation of one of them and using a mirror symmetry arrangement. Two prototypes have been designed, fabricated, and tested to proof the proposed concept in K-band. A good agreement has been obtained between numerical simulations and experimental results. The measured results confirm a remarkable AR improvement with values below 1 dB and 3dB gain and AR bandwidths larger than 23.7.

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关键词

Antenna measurements,Gain,Prototypes,Microstrip,Microstrip antennas,Reflector antennas,Feeds,Axial ratio (AR),circular microstrip patch,circular polarization,phase delay-line stub,reflectarrays