Abstract
AbstractA V dipole antenna with multiple stub loading is proposed as a traveling wave antenna with a wide bandwidth in both the gain and input impedance. It is considered that the present antenna is essentially a tapered transmission line loaded with open stubs. Then the operating principle is studied by reducing the structure to an equivalent nonuniform transmission line. It is found from the relationship between the equivalent distributed parameters and the stub that the dipole‐type stub array with its stub length reduced gradually from a half wavelength to a quarter wavelength is a basic structure for the broadband nature by the decaying traveling wave. Based on this concept, an actual stub‐loaded V dipole antenna was characterized numerically.It is demonstrated that uniform characteristics of an input admittance of 5 mS, a gain of 8 dB and a front‐to‐back ratio of 10 dB are obtained over ±30 percent around the center frequency in the case of a V dipole with an included angle of 30°. This antenna was fabricated and the validity of the present theory was confirmed because the theoretical and experimental results agreed well.
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