The photograph shows a standard size ‘half cube’ with a wire grid polariser on its angled face (and a HTPE lens on an ‘outer’ face). The polariser consists of a plane parallel array of metal wires.
Grids manufactured at St. Andrews typically use 25 micron diameter metal wires with their centers spaced apart by 50 microns (i.e. 50 micron grid pitch). These grids can separate orthogonal polarisations with a cross-polar leakage of 40dB or better at frequencies around 100 GHz and work well up to 500 GHz. The level of scattering/dissipation loss is well below 0.01 dB.
Content and pages maintained by: Jim Lesurf (jcgl@st-and.ac.uk)
using HTMLEdit3 on a StrongARM powered RISCOS machine.
University of St. Andrews, St Andrews, Fife KY16 9SS, Scotland.