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Tapering open wire feedlines?
I saw hints that the application of the tapered line matching section was
to a HF off centre fed dipole, and an assumption that as a multiband antenna, it had a feedpoint impedance of close to 200+j0. Most users of OCF dipole systems are expecting to be able to use the antenna on many bands without an ATU, and accept significant tradeoffs in peformance for that objective. It is unlikely that the feedpoint impedance of the dipole itself is sufficiently tight to worry too much about the broaband peformance of a tapered line matching section, much less the practicality of constructing low loss tapered two wire lines with Zo approaching 50 ohms. It is only when a system perspective is taken, that some of the component level discussion seems to be an interesting issue, but poor application. Owen |
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