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In the last two decades, the advances in communication technology, in particular mobile communications have drastically changed the lifestyles of people. Antenna engineers have contributed to this wireless revolution by designing high performance antennas for fixed base-stations and mobile portable terminals. The demands placed on mobile communication systems have increased remarkably, so antenna designers face many challenges: small or tiny sizes, low- or ultra-low-profiles, wide- or ultra-wide-operating bandwidths, multiple operative modes, polarization agility, and, of course, simple fabrication and low cost. As a result, antenna research and development have become a hot topic in both academia and industry.
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