Journal
PROGRESS IN ELECTROMAGNETICS RESEARCH M
Volume 25, Issue -, Pages 101-114Publisher
ELECTROMAGNETICS ACAD
DOI: 10.2528/PIERM12051410
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- UK Engineering and Physical Sciences Research Council (EPSRC) at the University of Manchester [EP/H021299/1]
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We present a polarisation rotator based on a dielectrically embedded metal Mesh Half Wave Plate (MHWP) working in the W band frequency range (75-110 GHz). The device was realised using metallic grids with sub-wavelength anisotropic geometries able to mimic the behaviour of natural birefringent materials. The device was designed using a combination of transmission line codes and finite element analysis able to achieve phase accuracy down to a fraction of degree. Very accurate intensity and phase measurements were carried out using coherent radiation from a Vector Network Analyser (VNA). The presented device performs better and it is much thinner than previous devices having reduced the number of grids by a factor two and minimised their inductive losses. The new mesh HWP has excellent performances in terms of differential phase -shift flatness and cross-polarisation respectively 180.4 +/- 2.9 degrees and -28 dB across a 25% bandwidth.
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