Question
Which of the following describes an extended double Zepp antenna?
Answer Options
- A) An end-fed full-wave dipole antenna
- B) A center-fed 1.5-wavelength dipole antenna
- C) A center-fed 1.25-wavelength dipole antenna
- D) An end-fed 2-wavelength dipole antenna
Correct Answer: C
Explanation
The Extended Double Zepp (EDZ) antenna is an extension of the basic half-wave dipole, designed to increase gain by lengthening the radiator beyond a full wavelength. This specific length maximizes gain in the broadside direction while maintaining a single, relatively clean main lobe.
An Extended Double Zepp antenna is described as a center-fed 1.25-wavelength dipole antenna (approximately 0.625 wavelengths on each side of the center feed point). This non-resonant length of 1.25\lambda creates a phase relationship that maximizes current and concentrates the radiation broadside to the wire, resulting in a gain increase of about 3 dB over a half-wave dipole.
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