Title :
Low-loss dielectrics for 10¿3000 GHz
Author :
Ayers, S. ; Davies, G.J. ; Haigh, J. ; Marr, D. ; Parker, A.E.
Author_Institution :
General Post Office, Research Department, London, UK
fDate :
11/1/1974 12:00:00 AM
Abstract :
A new vacuum melting extraction and casting (v.m.e.c.) process for polyolefins has resulted in exceptionally low dielectric losses in the range 10¿3000 GHz. At 12.5 GHz, losses in polypropylene have been found to be usually below 30 ¿ rad and in a few cases as low as 5 ¿ rad. Measuring techniques have been refined to cope with these low values. Loss angles at 13 and 28 GHz can be measured in waveguide bridges to a precision of ± 2 ¿ rad. Submillimetre spectra can be obtained by Fourier-transform spectroscopy with a reproducibility of better than 0.2% in the range 2¿200 cm¿1 (60¿6000 GHz).
Keywords :
dielectric losses; loss-angle measurement; microwave measurement; organic insulating materials; polymers; 10-3000 GHz frequency range; Fourier transform spectroscopy; dielectric loss; insulating materials; loss angles; loss measurement; low loss dielectrics; microwave measurement; organic compounds; polyolefins; polypropylene; submillimetre spectra; vacuum melting extraction and casting; waveguide bridges;
Journal_Title :
Electrical Engineers, Proceedings of the Institution of
DOI :
10.1049/piee.1974.0304
