Mathew,T; Stephen,D S; Aanandan,C K; Mohanan,P; K G Nair(Department of Electronics, 1994)
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Abstract:
A trapezoidal strip grating surface that eliminates specular
reflections almost over the entire X-band frequency range for TM
polarisation is reported. This new grating structure ovemmes the
bandwidth limitation of conventional rectangular strip grating
surfaces.
Rani, Joseph(Elsevier Science Limited, July 3, 1994)
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Abstract:
Diphenylamine was chemically attached to depolymerised natural rubber by
photochemical reaction. The rubber-bound diphenylamine was characterised
by TLC, HNMR, IR and TGA. The efficiency and permanence of the bound
diphenylamine was compared with conventional amine type antioxidant in
natural rubber vulcanizates. The rubber-bound diphenylamine was found to be
less volatile and less extractable compared to the conventional antioxidant.
The vulcanizates showed improved ageing resistance in comparison to vulcanizates
containing conventional antioxidant . Also, the presence of liquid
rubber-bound diphenylamine reduces the amount of plasticiser required for
compounding.
Supriyo,Dey; Aanandan,C K; Mohanan,P; K G Nair(Department of Electronics, 1994)
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Abstract:
A new modFed circularpatch antenna resonating at much lower
frequency compared to ordinary circular patch antenna having the same
radius is presented in this paper. me antenna also exhibits wide variation
in input impedance along the circumference of and hence can be matched
with microstrip feedline of any line impedance.