Antennas are devices that transmit or receive electromagnetic waves. Depending on how they transmit and receive electromagnetic waves, antennas can be classified into directional and omni (omnidirectional) antennas.

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Panel antenna is a type of directional antenna, which means that it sends and receives radio signals from only a single direction. With a wider beam, which causes the signal to cover a larger area.

Distributed antenna system (DAS) is a mobile communication network composed of multiple antenna nodes separated from each other in a predetermined space or building and connected to a variety of signal sources through a variety of signal transmission media.