![]() At various times, wide aluminum foil strips were used for the antenna. The bandwidth depends mainly on the antenna. To cover a bigger frequency range, the length of the stub would have to be adjusted.ĭuring development, a tuning stub with some excess length was used, and a sliding short-circuit contact was used to determine the correct length. Since it serves as an inductance, it goes linear with omega (frequency) up to a quarter wavelength (mistake corrected). To thank the Author because you find the post helpful or well done. Matching stubs and parallel transmission lines (another thread in German on this subject) In the attached picture, the voltage (solid line) and the current (dotted line) are shown over the length of the line.Īt the terminals, the impedance is the ratio of the two. ![]() It therefore functions as an inductance, with very low loss. In the previous case and for the dipole antenna use here, this line is shorted at the end and shorter than a quarter wavelength (about 100 mm long). If the end of the stub is either open or shorted, then the impedance at various points along the line is different (depending on frequency). Then it functions as an impedance transformer. In many configurations, the dipole is connected to one end of the tuning stub, and the lead in is connected somewhere along the line. Parallel wire conductors are used for impedance transformation or as a reactance. (Translation of text originally by Hans M.
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