11/12/2022 0 Comments Maa antenna files![]() LinearDipole - set length to 0.5(half-wavelength dipole) and notice that theimpedance is near 73 ohms. Radiation pattern shown is typicalfigure-8pattern. When a half-wave dipole is close to ground, the impedance isloweredto near 50 ohms. This is called an Extended Double Zeppantenna and produces the maximum gain possible from a simple center-feddipole. ![]() Notice that the radiation resistance (impedance) is about 90ohms. This antenna can be matched to 50 ohms by using a seriesinductor.Half of this antenna is 5/8 wave and is a common length for 2m mobileantennas.The 5/8 wave antenna is typically fed against a ground plane (car roof)andis usually matched with a tapped inductor. ![]() set lengthof dipole to multiples of 1/4 wave on each side (e.g. Notice how these lengths produce an radiationresistance(impedance) close to 100 ohms. ![]()
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