Plain-language answer: An impedance transformer changes the voltage-to-current ratio between source and load, often through turns ratio or transmission-line geometry.
Why it changes the result
The named ratio applies only within design conditions. Balance, frequency, core material, power, duty cycle, loss, and choking remain separate questions.
What to verify
Identify source and load impedances, balance on both sides, frequency, power, and common-mode needs before choosing it.
The common mistake
Selecting a transformer because its connector or thread fits.
Complete-system boundary
Match the exact radiator, feed system, return path, frequency, height, orientation, and environment. Connector or thread fit does not establish electrical compatibility, structural capacity, or safe operation.
