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From: David Jefferies
Date: 29 Apr 2002
Time: 17:17:50
Remote Name: 195.92.168.173
Hello Bill and interested others.
A brief report of measurements on a network analyser of the fundamental resonance of a 7.5 cm wire dipole, with 1mm, 1.5mm, and 3mm thick dielectric sleeving.
3mm thick sleeving reduces the resonance from 1868MHz to 1823MHz. This thickness is lambda/50, or 2% of a wavelength about. The relative dielectric constant of the sleeve is believed to be between 4 and 5. The perturbation in resonant frequency is a depression of about 2.4%.
Error here is plus or minus 5MHz in resonances.
regards
David Jefferies.
Hope to write this up as antenneX regular article later on with more detail.