Practice Test Geeks(CAD) Certified Antenna Designer Practice Test
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CAD Antenna Designer Feed Networks and Impedance Matching Flashcards

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  1. What is the primary purpose of an impedance matching network in an antenna system?

    Answer: To maximize power transfer by minimizing reflections between source and antenna

    Impedance matching maximizes power transfer by ensuring minimum reflection between source and load, following the maximum power transfer theorem.

  2. What is the standard characteristic impedance of coaxial cable used in most RF antenna systems?

    Answer: 50Ω

    50Ω is the industry standard characteristic impedance for most RF test equipment, cables, and antenna systems, balancing power handling and minimum loss.

  3. A quarter-wave transformer is used to match a 50Ω source to a 200Ω load. What characteristic impedance must the transformer section have?

    Answer: 100Ω

    The required characteristic impedance is the geometric mean of source and load: Z = √(Z_S × Z_L) = √(50 × 200) = √10000 = 100Ω.

  4. What does a VSWR of 1:1 indicate about an antenna system?

    Answer: Perfect impedance match with no reflected power

    A VSWR of 1:1 indicates perfect impedance match between source and load, meaning all available power is delivered with no reflections.

  5. What is the primary function of a balun in an antenna feed system?

    Answer: To convert between balanced and unbalanced transmission lines

    A balun (balanced-to-unbalanced transformer) converts between balanced transmission lines such as twin-lead and unbalanced lines such as coaxial cable to prevent common-mode currents.

  6. What is the reflection coefficient magnitude (|Γ|) when a 50Ω source drives a 100Ω load?

    Answer: 0.33

    Γ = (Z_L − Z_0)/(Z_L + Z_0) = (100 − 50)/(100 + 50) = 50/150 = 1/3 ≈ 0.33.

  7. Which transmission line type uses two parallel conductors separated by a dielectric and is classified as a balanced line?

    Answer: Twin-lead (parallel wire) line

    Twin-lead parallel wire transmission line is a balanced line with two conductors separated by a dielectric spacer, historically used for television and FM antenna connections.