Design of Multiband Loop Antennas for Smart Phone

Portable devices which must be small size, easy to fabricate heavily. Also, the antennas of handset devices must have not only low profile but also multiband operation. Thus,how to design a loop antenna to achieve multiband operation is mainly discussed in this book. It is so difficult that a loop antenna used to achieve the wideband operation at the lower frequency in the limited space. To meet the requirement that antennas can operate in broad band, two loop antennas which covers LTE and WWAN bands are presented. Arrangement of each tuning element and analysis methods are clearly demonstrated, making the complicated design process of the loop antennas easier to be analyzed step by step.