What is a benefit of low SWR?

• A. Increased bandwidth
• B. Improved power handling
• C. Reduced signal loss
• D. Higher frequency stability

Answer: (C)

Low Standing Wave Ratio (SWR) is an important concept in radio frequency (RF) communications, particularly regarding antenna performance. When SWR is low, it indicates that the impedance of the antenna system closely matches the impedance of the transmission line and the transmitter. This optimal match is crucial for effective power delivery from the transmitter to the antenna.

One of the primary benefits of low SWR is reduced signal loss. When the impedance is well matched, most of the power generated by the transmitter is radiated by the antenna, which minimizes the amount of power that gets reflected back toward the transmitter. This reflected power can cause inefficiencies and may even damage the transmitter if excessive.

In contrast, a high SWR indicates a poor impedance match, resulting in higher levels of reflected power, which can lead to increased losses in the system. Therefore, maintaining a low SWR is vital for ensuring that the maximum amount of signal reaches the intended area with minimal loss, improving overall communication effectiveness.