CAD CAD Antenna Designer Practical Applications and Systems 2

Question 1

When installing a Yagi-Uda antenna for point-to-point communication, what alignment step most directly maximizes received signal strength?

Accepted Answer

Boresighting both antennas so their maximum gain axes are co-aligned

Answer

Boresighting ensures both Yagi antennas' main lobes point directly at each other, maximizing the effective gain on the link and thereby received signal strength.

Question 2

What is the main advantage of using a log-periodic dipole array (LPDA) antenna in a broadband signal monitoring application?

Accepted Answer

Consistent gain and impedance across a wide frequency range

Answer

LPDAs maintain relatively constant gain and input impedance across a wide frequency range, making them ideal for broadband spectrum monitoring and signal interception.

Question 3

In a vehicle-mounted antenna installation, what grounding practice is essential for proper antenna performance and safety?

Accepted Answer

Ensuring a low-impedance RF ground bond between the antenna mount and vehicle chassis

Answer

A solid low-impedance RF ground bond between the antenna mount and vehicle chassis ensures the antenna operates against the correct ground plane and prevents RF voltage on chassis components.

Question 4

What distinguishes an active antenna from a passive antenna in a receiving system?

Accepted Answer

An active antenna includes an integrated low-noise amplifier (LNA) near the element

Answer

An active antenna integrates an LNA at or near the antenna element to amplify weak signals before cable losses degrade the system noise figure.

Question 5

A choke balun placed at the feed point of a dipole antenna primarily serves what function?

Accepted Answer

Preventing RF current from flowing on the outer shield of the coaxial feed line

Answer

A choke balun blocks common-mode (shield) currents on the coaxial feed line that would otherwise distort the dipole's symmetric radiation pattern.

(CAD) Certified Antenna Designer Practice Test

(CAD) Certified Antenna Designer Practice Test

CAD CAD Antenna Designer Practical Applications and Systems 2