Submillimeter wave frequency selective surface with polarisation independent spectral responses

Raymond Dickie, Robert Cahill, Harold Gamble, Vincent Fusco, M. Henry, M.L. Oldfield, P.G. Huggard, P. Howard, N. Grant, Y. Munro, P. De Maagt

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)

Abstract

This paper reports the design, construction and electromagnetic performance of a new freestanding frequency selective surface (FSS) structure which generates coincident spectral responses for dual polarisation excitation at oblique angles of incidence. The FSS is required to allow transmission of 316.5 - 325.5 GHz radiation with a loss = 0.6 dB and to achieve = 30 dB rejection from 349.5 - 358.5 GHz. It should also exhibit crosspolarisation levels below -25 dB, all criteria being satisfied simultaneously for TE and TM polarisations at 45° incidence. The filter consists of two identical, 30 mm diameter, 12.5 ?m thick, optically flat, perforated metal screens separated by 450 ?m. Each of the ˜5000 unit cells contains two nested, short circuited, rectangular loop slots and a rectangular dipole slot. The nested elements provide a passband spectral response centred at 320 GHz in the TE and TM planes; the dipole slot increases the filter roll-off above resonance. The FSS was fabricated from silicon-on-insulator wafers using precision micromachining and plating processes including the use of Deep Reactive Ion Etching (DRIE) to pattern the individual slots and remove the substrate under the periodic arrays. Quasi–optical transmission measurements in the 250 – 360 GHz range yielded virtually identical copolarised spectral responses, with the performance meeting or exceeding the above specifications. Experimental results are in excellent agreement with numerical predictions.
Original languageEnglish
Pages (from-to)1985-1994
Number of pages10
JournalIEEE Transactions on Antennas and Propagation
Volume57
Issue number7
DOIs
Publication statusPublished - Jul 2009

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