ANTENNAS FOR PORTABLE DEVICES - ISBN:9780470030738

ANTENNAS FOR PORTABLE DEVICES

Date: 28 April 2011, 04:51

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Electronic devices are a part of modern life. We are constantly surrounded by the
electromagnetic waves emitted from a variety of fixed and mobile wireless devices, such
as fixed base stations for audio/video broadcasting, fixed wireless access points, fixed radio
frequency identification (RFID) readers, as well as mobile terminals such as mobile phones,
wireless access terminals on laptops, sensors worn on the body, RFID tags, and radio
frequency/microwave thermal therapy probes in hospitals. Besides the fixed base stations,
many wireless devices are expected to be portable for mobile applications. Mobile phones,
laptops with wireless connection, wearable sensors, RFID tags, wireless universal serial bus
(USB) dongles, and handheld microwave thermal therapy probes have been extensively used
for communications, security, healthcare, medical treatment, and entertainment. Users of
portable wireless devices always desire such devices to be of small volume, light weight, and
low cost.
With the huge progress in very large scale integration (VLSI) technology, this dream
has become a reality in the past two decades. For example, the mobile phone has seen a
significant volume reduction from 6700 cm3 to 200 cm3 since 1979 [1]. However, with this
dramatic reduction in overall size, the antennas used in such portable devices have become
one of their biggest components. Therefore, much effort has been devoted to miniaturizing
the size of antennas to meet the demand for devices with smaller volume and lighter
weight.

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