What percentage of the signal power is attributed to the main lobe?

• A. 70%
• B. 85%
• C. 90%
• D. 95%

Answer: (B)

The correct answer reflects that typically, a significant portion of signal power is concentrated in the main lobe of a signal's radiation pattern. In many cases, around 85% of the signal power is attributed to the main lobe. This is an important concept in understanding how signals propagate and how effective devices are at focusing energy in a particular direction.

The main lobe is the primary component of a radiation pattern and is where the strongest signal strength occurs. Knowledge of how much power is found in the main lobe helps in assessing the efficiency of the speed measurement device, as well as in designing systems that can accurately capture and interpret data within that focused area. A figure of 85% highlights the balance needed in signal processing and reception, ensuring that the main lobe is dominant enough to provide reliable measurements while maintaining sensitivity to other contributing factors.

Understanding the distribution of power across lobes allows for greater insights into signal design, optimization, and potential interference management strategies.