Summary
International Symposium on Antennas and Propagation
2008
Session Number:4IS06b
Session:
Number:4IS06b-2
Comparison between matching circuits and parasitic patches to enlarge the bandwidth of a mobile phone
Yiqun Li, Cyril Luxey, Benoit Derat, Daniel Pasquet, Jean-Charles Bolomey,
pp.-
Publication Date:2008/10/27
Online ISSN:2188-5079
Summary:
While designing a mobile phone antenna, the obtained bandwidth results from a trade-off between several objectives subject to various constraints. For example, the antenna designer tries to maximize the total free-space efficiency (et) and simultaneously reduce the Specific Absorption Rate (SAR), while a smaller and smaller volume is generally required. Comparing with adding parasitic elements, adding reactive matching circuit between an antenna and its feed line is becoming more and more used recently, since such a circuit is small-volume, easy to implement, and low-cost. The aim of this article is to compare between the two mentioned methods of bandwidth enlargement, not only in terms of occupied volume and design complexity, but also of reflection coefficient (S11) and radiation performance. The two methods are here implemented experimentally on a PIFA antenna-chassis combination, with goal to transform a not well covered tri-band terminal into a penta-band one.