Question
Why are short connections used at microwave frequencies?
Answer Options
- A) To increase neutralizing resistance
- B) To reduce phase shift along the connection
- C) To increase compensating capacitance
- D) To reduce noise figure
Correct Answer: B
Explanation
At microwave frequencies, the wavelength of the signal is very small (in the centimeter range). Even a short physical length of wire or printed circuit board trace can represent a significant electrical length and thus introduce a measurable time delay and phase shift to the signal as it travels along the connection.
To ensure signal integrity and proper circuit timing, especially in devices like phase-locked loops or mixers, short connections are used to reduce phase shift along the connection. This minimizes the impact of the physical wiring on the intended electrical characteristics of the high-frequency circuit.
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