Slotted line usage at microwave frequencies State whether the following is correct: “A slotted line can be used for measurement at high (microwave) frequencies.”

Introduction / Context:
The slotted line is a classic measurement instrument consisting of a section of transmission line with a longitudinal slot that allows a movable probe to sample standing-wave patterns. It is widely associated with microwave laboratory practice for determining impedance, VSWR, and wavelength.

Given Data / Assumptions:

• Operating regime: microwave frequencies (GHz range).
• Properly designed probe and detector to minimally disturb the field.

Concept / Approach:
At microwaves, wavelengths are short enough that standing-wave maxima and minima are conveniently spaced for mechanical probing. By moving the probe along the slotted section, one can measure the distance between minima (half guided wavelength), calculate reflection coefficient, and determine load impedance via standard relationships. Hence the statement that a slotted line can be used for high-frequency measurement is correct.

Step-by-Step Solution:

Verification / Alternative check:
Historically, before modern VNAs, slotted lines were the standard tools for microwave impedance and VSWR measurements, confirming their suitability at high frequencies.

Why Other Options Are Wrong:

• False: contradicts long-standing use of slotted lines in microwave labs and waveguide benches.

Common Pitfalls:
Using a probe that excessively perturbs the field; misreading positions due to finite probe size or detector nonlinearity.

Final Answer:
True