Microwave communication is important for modern information technologies. Your cellphone uses at least three microwave communication...

Microwave communication is important for modern information technologies. Your cellphone uses at least three microwave communication technologies: the mobile signal, the WiFi signal, and the GPS location service. Google for the frequency bands for these three technologies, and briefly explain why we can have all three functions running on a single cellphone simultaneously without them interfering with each other.

Expert Solution

Current 4g mobile signals are transmitted at various frequency bands ranging from 1700MHz to 2700MHz.

WiFi signals works in two frequency bands: 2400MHz-2500MHz and 5725MHz-5875MHz. These two bands are among few Industrial, Scientific and Medical (ISM) frequency bands which are internationally agreed unlicenced bands. The 2400-2500MHz band do not overlap with any of the 4g frequency band.

GPS signals also transmit data on multiple frequency bands:

L1 : 1575.42MHz with bandwidth of 15.345MHz

L2 : 1227.60MHz with bandwidth of 11MHz

L5: 1176.45MHz with bandwidth of 12.5MHz

Although the net signal around a mobile device is a superposition of all the electromagnetic signals, but each mode (a EM signal of specific frequency) is independent of the other modes. In other words, different modes do not interfere or interact with each other. Various receivers are designed to receive signals at a specific frequency band. For example, a WiFi receiver is designed to receive signals in frequency bands 2400-2500MHz or 5725-5875MHz or both. So, the functioning of all the signals and the receivers becomes independent of one another and they are able to run simultaneously on a single cellphone.

genius_generous answered 7 months ago

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