Holographic Surface Leaky-Wave Lenses With Circularly-Polarized Focused Near-Fields-Part I: Concept, Design and Analysis Theory Articles uri icon

authors

publication date

  • July 2013

start page

  • 3475

end page

  • 3485

issue

  • 7

volume

  • 61

international standard serial number (ISSN)

  • 0018-926X

electronic international standard serial number (EISSN)

  • 1558-2221

abstract

  • A novel concept of planar printed-circuit microwave lens, based on the transformation of a cylindrical surface wave into a modulated leaky wave, is presented in this paper. Inspired on holographic concepts, the TM0 cylindrical leaky wave is properly tapered across the two-dimensional surface by using an Archimedean-spiral shaped slotted printed-circuit, so that it is obtained a quadratic-phase, quasi-uniform amplitude aperture distribution which creates a highly focused circularly-polarized near-field pattern. The first part of this paper describes the general analysis and synthesis methodology to obtain planar holographic lenses with high radiation and focusing efficiency. As an example, a printed-slot lens with 6 lambda(0) diameter and focal ratio F/D = 1 operating at 10 GHz is designed and theoretically studied by simulations. The second part of the paper concentrates on the prototype and measurements.

keywords

  • planar printed-circuit microwave lens; cylindrical surface waves; holography