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Tuning technique for active FSS arrays

Tuning technique for active FSS arrays

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A novel biasing technique is described for active frequency selective slot arrays. The bandpass response can be switched between transmitting and reflecting modes, or tuned over a predetermined frequency range using two different biasing circuit configurations based on the same technology. The biasing layer is separated from the slot layer by a very thin, flexible, substrate while pin and varactor diodes are employed for switching and tuning, respectively. One application is the time-dependent modification of the EM architecture of buildings, permitting access to frequency bands as desired.

References

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      • T.K. Chang , R.J. Langley , E.A. Parker . Active frequency selective surfaces. IEE Proc., H , 62 - 66
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      • Philippakis, M., Martel, C., Kemp, D., Allan, R., Clift, M., Massey, S., Appleton, S., Damerell, W., Burton, C., and Parker, E.A.: ‘Application of FSS structures to selective control the propagation of signals into and out of buildings’, Ofcom ref. AY4464A, 2003 (http://www.ofcom.org.uk/research/technology/spectrum_efficiency_scheme/ses2003-04/ay4464a/survey.pdf).
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      • Wong, A.H., Neve, M.J., Sowerby, K.W.: `Performance analysis for indoor wireless systems employing directional antennas in the presence of external interference', Proc. IEEE AP-S Int. Symp. 2005, 2005, Washington, DC, USA, 1A, p. 799–802.
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      • B. Sanz-Izquierdo , L.T. Ekpo , J.-B. Robertson , E.A. Parker , J.C. Batchelor . Wideband EM architecture of buildings: six-to-one dual-passband filter for indoor wireless environments. Electron. Lett. , 21 , 1268 - 1269
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      • I.K. Ghaffer , K.L. Ford , K.P. Esselle , A.R. Weily , C. Panagamuwa , J.C. Batchelor . Single-layer bandpass active frequency selective surface. Microw. Opt. Technol. Lett. , 8 , 2149 - 2151
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