Wireless Media

  It is also known as a wireless media. Wireless media transmit and receive electromagnetic signals without and electrical or optical conductor.  Here transmission and reception achieved by means of an antenna. For transmission antenna emits signal into medium and for reception antenna picks up electromagnetic signals from the surrounding medium. The two forms of transmission:

  Directional: - In this, transmitting antenna puts out a focused electromagnetic beam. The transmitting receiving antenna must be aligned, known as Point-to-Point Communication.

   Omni-directional: - In this the transmitted signal spreads out in all direction and be received by many antenna inspite of direction.

According to frequency range the wireless media is divided into three parts:-

·         Radiowave (30MHz-1GHz): Omni directional transmission

·         Microwave (1-40GHz): Point-to-Point Communication

·         Infrared (100GHz-1000 THz light frequencies): Local Point to Point, Multipoint application within confined areas.