Micromachined 300GHz high Q resonant slot frequency selective surface filter

Raymond Dickie, Robert Cahill, Harold Gamble, Vincent Fusco, B. Moyna, P. Huggard, N. Grant, C. Philpot

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


The design of a low loss quasi-optical beam splitter which is required to provide efficient diplexing of the bands 316.5-325.5 GHz and 349.5-358.5 GHz is presented. To minimise the filter insertion loss, the chosen architecture is a three-layer freestanding array of dipole slot elements. Floquet modal analysis and finite element method computer models are used to establish the geometry of the periodic structure and to predict its spectral response. Two different micromachining approaches have been employed to fabricate close packed arrays of 460 mm long elements in the screens that form the basic building block of the 30mm diameter multilayer frequency selective surface. Comparisons between simulated and measured transmission coefficients for the individual dichroic surfaces are used to determine the accuracy of the computer models and to confirm the suitability of the fabrication methods.
Original languageEnglish
Pages (from-to)31-36
Number of pages6
JournalIEEE Transactions on Antennas and Propagation
Volume151 (1)
Publication statusPublished - Feb 2004


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