Narrow-banded

Describing a signal, device, or system that operates within a limited, specific frequency range, or exhibiting a restricted bandwidth. This characteristic implies a focused operational scope, concentrating its functionality on a designated portion of the electromagnetic spectrum or other applicable domain. The term often arises in contexts like radio communications, where it specifies the frequencies a transmitter or receiver is designed to use. It signifies efficiency in transmitting information by isolating the required frequency range. It stands in contrast to broad-band systems that use larger swathes of the electromagnetic spectrum.

Narrow-banded meaning with examples

• The old analog radio employed a narrow-banded FM signal, allowing for effective communication over a defined channel, but limited in its ability to carry complex data. The limited frequency range resulted in less data capacity compared to modern digital systems, which enables the usage of a broader bandwidth. However, it was efficient for voice transmission due to the focused nature of the signal.
• In spectroscopy, a narrow-banded filter selectively allows only a small band of wavelengths to pass through, isolating a specific spectral line for analysis. This technique is essential for studying the composition of materials by observing the emission or absorption of light at precise frequencies. This precision contrasts with broad-spectrum analysis.
• A narrow-banded antenna, such as a dipole antenna, is designed to resonate efficiently at a specific frequency. It is extremely efficient in capturing or transmitting signals within a limited bandwidth around its resonant frequency. The antenna becomes less effective at frequencies outside of its designed narrow band.
• To reduce noise, the audio equipment utilizes a narrow-banded filter at the output. This helps to remove unwanted interference, which is critical for signal clarity. This narrow-banded output keeps interference from broader frequency ranges out of the final audio signal.