In communications, a system is wideband when the message bandwidth significantly exceeds the coherence bandwidth of the channel. Some communication links have such a high data rate that they are forced to use a wide bandwidth; other links may have relatively low data rates, but deliberately use a wider bandwidth than "necessary" for that data rate in order to gain other advantages; see spread spectrum.

A wideband antenna is one with approximately or exactly the same operating characteristics over a very wide passband. It is distinguished from broadband antennas, where the passband is large, but the antenna gain and/or radiation pattern need not stay the same over the passband.

The term Wideband Audio or (also termed HD Voice or Wideband Voice) denotes a telephony using a wideband codec, which uses a greater frequency range of the audio spectrum than conventional voiceband telephone calls, resulting in a clearer sound. Wideband in this context is usually considered to cover frequencies in the range of 50–7000 Hz, therefore allowing audio with richer tones and better quality.

According to the United States Patent and Trademark Office, WIDEBAND is a registered trademark of WideBand Corporation, a USA based manufacturer of Gigabit Ethernet equipment.

In some contexts wideband is distinguished from broadband in being broader.

Other articles related to "wideband":

... The MINTERM is lightweight, low-power, single channel, half-duplex, narrowband/wideband/wireline terminal providing secure voice and data communications with full key distribution and remote rekey ... between the MINTERM and the VINSON wideband COMSEC equipment ... It is a wideband/narrowband terminal that interoperates with the TACTERM, MINTERM, VINSON, and Single Channel Ground and Airborne Radio System (SINCGARS) ...
BBN Butterfly
... intended for carrying voice and video over wideband networks ... the router of DARPA's high-speed descendant of ARPANET, the Satellite Wideband Network ... This network later became the Terrestrial Wideband Network ...
Current Transformer - Special Designs
... Specially constructed wideband current transformers are also used (usually with an oscilloscope) to measure waveforms of high frequency or pulsed currents within pulsed power systems ... One type of specially constructed wideband transformer provides a voltage output that is proportional to the measured current ... Unlike CTs used for power circuitry, wideband CTs are rated in output volts per ampere of primary current ...
audio" class="article_title_2">Wideband Audio
... Wideband audio, also known as HD voice, refers to the next generation of voice quality for telephony audio resulting in high definition voice quality compared to standard ... Wideband audio relaxes the bandwidth limitation and transmits in the audio frequency range of 50 Hz to 7 kHz or higher ... the International Telecommunication Union (ITU) standardized a version of wideband audio as G.722 ...
Wideband Global SATCOM System
... The Wideband Global SATCOM system (WGS) is a high capacity satellite communications system planned for use in partnership by the United States Department of Defense (DoD ... DoD wideband satellite communication services are currently provided by a combination of the existing Defense Satellite Communications System (DSCS) and Global Broadcast Service (GBS) satellites ...