UNGUIDED MEDIA: WIRELESS
{"Image DocumentName": "UNGUIDED MEDIA: WIRELESS", "Image ImageDescription": "Radio waves. Radio waves: waves range in frequencies between 3 KHz and 1 GHz. Microwaves: waves ranging in frequencies between 1 and 300 GHz. Radio waves are omnidirectional (propagated in all directions) The sending and receiving antennas do not have to be aligned. Disadvantage. One antenna interferences another antenna when they using same frequency. Radio waves that propagate in the sky mode, can travel long distance [AM radio] Radio waves [low and medium frequencies] can penetrate walls inside a building. Advantage: an AM radio can be received inside a building. Disadvantage: we cannot isolate a communication to just inside or outside a building. Applications. Useful for multicasting: Radio, television. Cordless phones and paging system.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}