Please add reasoning and explanation for better understanding if possible What f

Question

Please add reasoning and explanation for better understanding if possible

What frequencies (approximately) are radiated by your mobile phone? Assume PCS/GSM cellular bands for 3G and 4G, WiFi (802.11b or other), and Bluetooth. (Note - look them up, depending on which carrier you have, e.g. AT&T;, T-Mobile, etc.) What wavelengths do they correspond to? What is the electrical length of your mobile phone (e.g. iPhone 5s, Samsung, etc.) in wavelengths for each of these bands? What are their bandwidths in MHz and the fractional bandwidths in % for each of these bands? You should organize these into a simple table for clarity. If your phone had an old-style "whip" antenna, which basically acts as a dipole, would you expect your signal to be a maximum or minimum if you point the tip of the antenna directly toward the base station? What is the fundamental source of electromagnetic radiation - i.e. what physically causes it, or in other words what is required for radiation to occur?

Explanation / Answer

Solution no 8.

Mobile phone radiation and health concerns have been raised, especially following the enormous increase in the use of wireless mobile telephony throughout the world. This is because cell phones use electromagnetic radiation in the microwave ranges. These concerns have induced a large body of research in animals and in humans.

The mobile phone system is referred tp as "Cellular telephone system" because the coverage area is divided into "cells" each of which has a base station antenna. Cell phones use electromagnetic radiation in the microwave range around 2.5 GHz range.These radiations are close to microwave range. and with similar properties part of the radio wave emmitted from the mobile phone is absorbed by the human head. The radiation emitted by a GSM handset can have a peak power of 2 Watts.

The electrical length of a Transmission medium, its length expressed as a multiple or submultiple of the wavelength of a periodic electromagnetic oe electrical signal propagationg within the medium. The electrical length of aphysical medium will be always greater than its physical length. eg. coaxial cables, distributed resistances etc. The Electrical length is in general different from physical length. By the addition of an appropriate reactive element (Capacitive or inductive), the electrical length may be made significantly shorter or longer than the physical length.

Solution 10.

The fundamental source of electromagnetic radiation is oscillating electric charges which emits oscillating electric and magnetic fields. The wavelengths of radio waves are longer than those of light waves, which are longer than the wavelengths of X- rays. The radio waves are certainly travel at the speed of energy other electromagnetic waves--- the speed of light.

In physics, electromagnetic radiation (EM radiation or EMR) refers to the waves or their quanta, photons of electromagnetic field, propagating through space carrying electromagnetic radiant Energy. It includes radio waves, microwaves, visible light, ultra violet, X - and gamma radiation.

Solution 9..

If your phone had an old style "whip" antenna, that means the phone is acting like a dipole antenna and the signal is to be in minimum if the tip of an antenna directly towars the base station because if the tip of the antenna directly towards the base station the signal get reached easily as you know the medium of communication is Air.

For an example... UBR system design- Unspecified Bit Rate

Here we place two UBR at two ends. First at terminal and second on base. The link distance between these two points is maximum 2 Kms but we prefer 1 Km to 1.5 Kms for better alignment. After the equipments are installed properly we should do the commissioning of the ubr login by Console cable or LAN cable. The transmission power we put a range from 7 to 15 Tx Power according to the distance between Terminal and Base Station.

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