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• W605702978 abstract "The performance of a planar Frequency Selective Surface (FSS) cannot be changed oradapted once the manufacturing process has been completed. In practice, however, itwould be advantageous to be able to do so, in order to increase flexibility ofperformance in multiband systems for example. This thesis examines a novelelectromagnetict echniquet hat has beend eveloped,w hereby the frequencya nd/or theangular response of FSS's can be tuned in situ over a wide range of frequenciesand/or steering angles. The technique employed is passive and relies upon thedisplacemento f closely separated( and therefore closely coupled) arrays with respect to each other. A global loading of the array results so that the reconfigurable FSS (RFSS) will produce a broadband and/or multibeam response without altering theindividual array design. The experience and understanding gained during this work was subsequently used to produce FSS responses of extreme angular stability. In this case a static, double layerstructure has been used to make use of the high coupling between the layers i.e. twoFSS's printed on a single dielectric substrate to form a close coupled FSS (CCFSS). Itwas found that the coupling between the two layers was highly dependent on therelative displacement between arrays. This displacement is introduced staticallyduring the manufacture of the FSS. The cases described use two identical layers. Afurther development of this concept makes use of complementary conducting andaperture elements giving rise to a complementary FSS (CFSS). The CFSS is alsomanufactured on a common dielectric and produces ultra stable resonant frequenciesfor both TE and TM oblique incidences.Theoretical verification of the measured results has been achieved, and the measuredand predicted results agreed very closely. Modal analysis, using a novel coupledintegral equation technique, has been used to predict the response of the RFSS andCFSS. The correlation between the predicted and measured transmission response ofthe RFSS was very good and it was discovered that operational stability of thebandwidths and band spacing ratios were significantly improved over conventionalstatic FSS." @default.
• W605702978 created "2016-06-24" @default.
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• W605702978 date "1999-01-01" @default.
• W605702978 modified "2023-09-26" @default.
• W605702978 title "Reconfigurable and closely coupled frequency selective surfaces" @default.
• W605702978 hasPublicationYear "1999" @default.
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