Internal antennas found in electronic devices like cell phones have limitations due to limited space within the device and the federal electromagnetic radiation exposure requirements; that dictate the amount of electromagnetic radiation users of the device can be exposed to. Factors affecting how well an internal antenna perform are the power of the transmitter and how well the electromagnetic radiation are shielded. Of course, antenna designs that incorporate effective RF and EMI shielding can increase effective power and stay within the federal requirements.
Many antennas are rated using a measurement called “Gain” which indicates how the energy from the antenna’s signal is redirected to receivers. The gain does not indicate a change in the level of energy that the antenna uses to transmit the signal. For example, let’s compare two antennas of the same power rating but one rated at 0db gain and the other rated at high decible gain. The 0db gain antenna will have its power radiated in all directions and is better suited to areas where the signal can bounce or reflect off buildings or mountains – areas that have some type of obstruction. The high gain antenna will work better when the energy can be transmitted parallel to the ground and the path is unobstructed – like on a lake or in flat rural areas.
The system works when the transmitter generates a sine wave which is a continuously varying wave that radiates out from the antenna and fluctuates evenly through space. The signal (sound, when it’s a cell phone) from the device is fed from the transmitter to the internal antenna, which then sends the signal out. The radio waves that send the encoded signal are made up of electromagnetic radiation propagated by the antenna.
With years of design and manufacture of internal antennas with excellent RF and EMI protection, Faspro Technologies can develop internal wireless device antennas with wide bandwidth for high performing portable wireless devices, whether for single/dual band GSM networks for use in developing countries or for LTE or 4G networks being rolled out now.
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