MidBand

Midband is a term used in telecommunications and signal processing to denote the central portion of a system's usable frequency spectrum. It lies between the low-frequency portion (lowband) and the high-frequency portion (highband). The exact boundaries of midband depend on the context, such as the system's overall bandwidth, standards, and design goals. In many cases, midband is chosen to provide a favorable compromise between bandwidth efficiency and susceptibility to noise and attenuation.

In circuit theory and radio engineering, midband commonly refers to the region of a system's frequency response where the gain is approximately constant (flat) with frequency; this is the region between the lower and upper cutoff frequencies of the passband. Designers often quote the midband gain as the characteristic gain, distinct from the low-frequency roll-off and high-frequency roll-off behavior. The term can also describe the portion of the spectrum allocated to a service, such as middle-range channels, depending on regulatory allocations and technology.

In practice, midband concepts are used in filter design, equalization, and channel planning. Understanding midband behavior helps predict how a system will perform for typical signals, while away from midband the response may degrade due to attenuation, phase shift, or distortion.