At 900 MHz, the frequency range of cell phones, one wavelength is 0.3333 m. A quarter wavelength antenna would be 0.3333/4 = 0.08333 m or 3.28 in. Ground-Plane Antenna Antennas can be anywhere from a long horizontal copper wire to a vertical steel or aluminum tower several hundred feet ...
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Most modern cell phones have two cellular antennas. We've discussed previouslyantenna design for the primary cellular antenna. The second cellular antenna is the diversity antenna. This antenna typically does receive only. This means it only needs to cover the Rx frequencies, and not the Tx frequ...
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It's a design nod back to some of the earliest cellular phone designs which packed external whips that one could manually extend for improving reception. Since then, designs evolved, and until recently virtually all smartphones have packed internal antennas at the bottom of the phone. The iPhone...
Presently, antennas for radio communication devices, such as mobile phones, are mounted directly on the phone chassis. However, as the size and weight of portable terminals continue to decrease, the above-described antennas become less advantageous due to their size. Moreover, as the functionality...