Question
What antenna matching system matches coaxial cable to an antenna by connecting the shield to the center of the antenna and the conductor a fraction of a wavelength to one side?
Answer Options
- A) Gamma match
- B) Delta match
- C) T-match
- D) Stub match
Correct Answer: A
Explanation
The Gamma match is a popular method used for feeding Yagi antennas and other parasitic arrays, specifically when the driven element is mounted directly to a conductive boom. It is an unbalanced feed system designed to provide a high-to-low impedance transformation.
The Gamma match achieves this by connecting the coaxial cable shield to the center of the antenna (which is grounded to the boom) and connecting the coaxial cable’s conductor a fraction of a wavelength to one side of the center. This off-center connection creates an unbalanced tap that can be adjusted along the driven element to find the optimal impedance point, while the center grounding helps to suppress common-mode current.
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