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Formation of linear polyenes –(CH=CH)n– during thermal dehydration of thin layers (9–20 μm) of poly(vinyl alcohol) containing phosphotungstic-acid and aluminum-chloride catalysts was investigated. It was found that the concentration of long-chain (n ≥ 8) polyenes in films containing phosphotungstic acid increased smoothly with increasing annealing time although the kinetics of the dehydration were...
We present here two linear arrays mounted in the same aperture: the first array with 4 elements at 2.7 GHz (spacing 0.7λ) and the second array with 4 elements at 7.0 GHz (spacing 1.8λ). It is shown that by special design of the single high frequency element grating lobes are eliminated. The isolation between the two arrays is better than 14 dB.
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