What phenomenon results from standing waves in an antenna system?

• A. Increased power output
• B. Signal amplification
• C. Power loss and poor antenna efficiency
• D. Higher transmission range

Answer: (C)

Standing waves in an antenna system are a consequence of reflection within the transmission line or antenna structure, leading to points of maximum (antinodes) and minimum (nodes) amplitude along the wave. When these standing waves occur, they indicate a mismatch between the antenna and the transmission line, which can lead to power being reflected back toward the source rather than being transmitted effectively into free space.

This reflection results in power loss, meaning that not all of the energy generated by the transmitter is radiated as intended. Therefore, the efficiency of the antenna system diminishes, leading to poor performance. A well-matched antenna system minimizes reflections and standing waves, ensuring that maximum power is radiated, which is crucial for effective communication.

In contrast, options such as increased power output or higher transmission range would typically require an efficient antenna system where standing waves do not play a significant role. Likewise, signal amplification is not a direct result of standing waves; instead, it refers to an increase in signal strength through electronic means rather than a consequence of the physical characteristics of the antenna system itself.