AdvancedA-007-003-001

What term describes a method used to match a high-impedance transmission line to a lower impedance antenna by connecting the line to the driven element in two places, spaced a fraction of a wavelength on each side of the driven element centre?

D
Answer
Interference, EMC, and safety
Type
A
The gamma match
B
The stub match
C
The omega match
D
The T match

Answer Notes

A T match is used to match a balanced, high-impedance transmission line to a balanced, lower-impedance antenna element, such as a continuous dipole driven element. It works by connecting the transmission line to two points on the driven element, equally spaced on either side of the center. This creates a balanced, T-shaped physical structure that effectively transforms the impedance to match the feedline. It differs from the gamma match, which is an unbalanced system that connects to only one side of the center. The symmetrical two-point connection is the defining characteristic of the T match.
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What term describes an unbalanced feed system in which the driven element of an antenna is fed both at the centre and a fraction of a wavelength to one side of centre?