What does the term wireless imply?
Wireless describes the products and standards that allow communications without additional electrical connections. Typically, the term wireless implies that electromagnetic waves traveling through the air carry information from one place to another. Depending on their frequency, these waves exhibit different properties. For example, microwaves (on the order of GHz) tend to bounce off walls and objects. At the opposite extreme are low frequency waves (on the order of tens of MHz) which tend to travel through walls and objects. The wireless systems designer selects the operating frequency suitable for a particular application, thereby taking advantage of some of these properties.
