Radially polarized annular-slot leaky-wave antenna for three-dimensional near-field microwave focusing
IEEE Antennas and Wireless Propagation Letters
- Volumen: 13
- Fecha: 01 enero 2014
- Páginas: 583-586
- ISSN: 15361225
- Tipo de fuente: Revista
- DOI: 10.1109/LAWP.2014.2311854
- Tipo de documento: Artículo
- Editorial: Institute of Electrical and Electronics Engineers Inc.
Microwave three-dimensional near-field focusing with radial polarization using a holographic annular-slot antenna is demonstrated in this letter. This radial polarization can generate axially polarized focused fields in the near-field regime, which complements the more conventional synthesis of transversally polarized near-field focusing patterns. Moreover, it is shown that more symmetrical focal region is obtained thanks to the radial polarization for similar Fresnel number N and operation frequency. The theory is demonstrated with experiments for a design operating at 10 GHz, with aperture diameter D=6¿ and a Fresnel number N=4. © 2002-2011 IEEE.