UHF CM4248 Folded Dipole Bowtie (ONLY) analyzed using 4nec2.
Dimensions from cm4248 4nec2 file posted by 300ohm, derived from Ken Nist's cm4248a.ez file. Also found in other Channel Master antennas.
CM4248's Bowtie has two rearward facing stubs, the first results are for this "As-Built" configuration. Note that the stubs are effectively EXTENDING the overall length of the Bowtie Elements, resulting in a NARROWER Bowtie, which has LOWER Raw Gain than for a Bowtie without the stubs (see next analysis).
Removing the stubs shifted the frequency of operation significantly upwards (see Wideband Charts at bottom), which was countered by Rescaling LARGER by the factor 1.38, as shown in the second set of results.
This comparison emphasizes the importance of MODELING to determine results, rather than expecting Wideband Bowties to follow a 1/2-wavelength or full-wavelength or some other sort of commonly encountered "Design Rule".
Date(s): 17 Jan 2012. Album by holl_ands. 1 - 29 of 29 Total. 12523 Visits.