What system matches a higher-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 each side of element center?

  1. The gamma matching system
  2. The delta matching system
  3. The omega matching system
  4. The stub matching system


What is the name of an antenna matching system that matches an unbalanced feed line to an antenna by feeding the driven element both at the center of the element and at a fraction of a wavelength to one side of center?

  1. The gamma match
  2. The delta match
  3. The epsilon match
  4. The stub match


What is the name of the matching system that uses a section of transmission line connected in parallel with the feed line at or near the feed point?

  1. The gamma match
  2. The delta match
  3. The omega match
  4. The stub match


What is the purpose of the series capacitor in a gamma-type antenna matching network?

  1. To provide DC isolation between the feed line and the antenna
  2. To cancel the inductive reactance of the matching network
  3. To provide a rejection notch that prevents the radiation of harmonics
  4. To transform the antenna impedance to a higher value


How must an antenna's driven element be tuned to use a hairpin matching system?

  1. The driven element reactance must be capacitive
  2. The driven element reactance must be inductive
  3. The driven element resonance must be lower than the operating frequency
  4. The driven element radiation resistance must be higher than the characteristic impedance of the transmission line


Which of these feed line impedances would be suitable for constructing a quarter-wave Q-section for matching a 100-ohm loop to 50-ohm feed line?

  1. 50 ohms
  2. 62 ohms
  3. 75 ohms
  4. 450 ohms


What parameter describes the interactions at the load end of a mismatched transmission line?

  1. Characteristic impedance
  2. Reflection coefficient
  3. Velocity factor
  4. Dielectric constant


What is a use for a Wilkinson divider?

  1. It divides the operating frequency of a transmitter signal so it can be used on a lower frequency band
  2. It is used to feed high-impedance antennas from a low-impedance source
  3. It is used to divide power equally between two 50-ohm loads while maintaining 50-ohm input impedance
  4. It is used to feed low-impedance loads from a high-impedance source


Which of the following is used to shunt-feed a grounded tower at its base?

  1. Double-bazooka match
  2. Hairpin match
  3. Gamma match
  4. All these choices are correct


Which of these choices is an effective way to match an antenna with a 100-ohm feed point impedance to a 50-ohm coaxial cable feed line?

  1. Connect a 1/4-wavelength open stub of 300-ohm twinlead in parallel with the coaxial feed line where it connects to the antenna
  2. Insert a 1/2 wavelength piece of 300-ohm twinlead in series between the antenna terminals and the 50-ohm feed cable
  3. Insert a 1/4-wavelength piece of 75-ohm coaxial cable transmission line in series between the antenna terminals and the 50-ohm feed cable
  4. Connect a 1/2 wavelength shorted stub of 75-ohm cable in parallel with the 50-ohm cable where it attaches to the antenna


What is the primary purpose of phasing lines when used with an antenna having multiple driven elements?

  1. It ensures that each driven element operates in concert with the others to create the desired antenna pattern
  2. It prevents reflected power from traveling back down the feed line and causing harmonic radiation from the transmitter
  3. It allows single-band antennas to operate on other bands
  4. It creates a low-angle radiation pattern