Design, analysis and measurements of reflected phased array microstrip antennas at Ka-band using passive stubs

This paper presents the design, analysis and measurements of planar microstrip reflectarray antenna at 32.5 GHz. The antenna element is a rectangular patch. The progressive phasing necessary to switch the main beam off the broadside is done by loading each antenna element with a variable length transmission line. The design procedure and critical parameters are discussed. To validate this technique, number of arrays are built and measured, showing good agreement with the simulations.