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• W2737633928 abstract "Abstract The suitability of photoconducting semiconductors for switches in metamorphic (reconfigurable) segmented antennas was investigated. Optically activated switches offer the benefit that metallic bias lines, which could affect antenna performance if included on the antenna plane, are not required. Bowtie antennas were designed and modelled; results indicating a broad frequency coverage, formed from switching between narrower contiguous bands, were obtained. First simple evaluation structures incorporating photoconducting semiconductors were designed and fabricated. Optically activated changes in microwave properties (S 11 and S 12 ) were measured. Introduction This paper summarises work from the second year of an EMRS DTC project on metamorphic antennas. Work in the first year was based on an antenna concept comprising a photoconducting layer behind which is a pixellated light source. The pixellated light source is addressable and reconfigurable, creating different patterns of high conductivity on the photoconductor. These define different antenna shapes, to give changeable antenna properties [1]. Work focussed on establishing the attainable performance of photoconducting layers and comparing it against the needs of optically addressed metamorphic antennas. This was undertaken by: (a) fabricating and assessing photoconducting CdS/CdSe layers; (b) defining the performance needed from the photoconductor through electromagnetic modelling. It was concluded that the realisation of a metamorphic antenna, using a low cost photoconductive layer under realistic levels of illumination, would be extremely difficult to achieve. This is because the photoconductivity is low if the large area fabrication techniques (such as thick film deposition) needed for antenna applications are used. A porous morphology limited the maximum conductivity obtainable [1]. Consequently a different approach to implement a metamorphic antenna was investigated in the second year of the project. In this approach small area semiconductors were used as switches between the conducting elements of segmented apertures or antennas (as illustrated in Figure 4). Altering the combination of ON and OFF switch settings creates different antenna shapes with correspondingly different antenna properties. By using small areas of photoconducting semiconductor this later approach offers two advantages over the earlier, large-area, photoconducting layer approach: firstly a monocrystal semiconductor can be used, providing high mobility and conductivity; secondly the total optical power requirement for switching should be considerably reduced. A metamorphic antenna would primarily offer future systems a rapidly and electronically reconfigurable antenna providing: (a) wide frequency coverage" @default.
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• W2737633928 date "2008-01-01" @default.
• W2737633928 modified "2023-09-26" @default.
• W2737633928 title "Optically Controlled Metamorphic Antenna" @default.
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