Summary
International Symposium on Antennas and Propagation
2009
Session Number:3D2
Session:
Number:3D2-1
Simple Small-Size Coupled-Fed Uniplanar PIFA for Penta-Band WWAN Clamshell Mobile Phone
Ting-Wei Kang, Kin-Lu Wong,
pp.1003-1006
Publication Date:2009/10/21
Online ISSN:2188-5079
Summary:
Owing to the rapid development in the mobile communication systems, penta-band operation for WWAN communications has been demanded for many modern mobile phones. In this paper, we present a small-size printed PIFA capable of generating two wide operating bands to cover GSM850/900 and GSM1800/1900/UMTS operations in the clamshell mobile phone. The proposed PIFA has a simple uniplanar structure formed by a single radiating strip coupled-fed by a feeding strip and is easily printed on a small area of 10 × 40 mm2 only. By applying the proposed PIFA at the hinge of the clamshell mobile phone, whose two ground planes are connected through an extended connecting strip of proper length, both the PIFA and the two ground planes can be efficient radiators. Efficient dipole-like resonant modes (0.5λ and 1.0λ modes) can be excited and fine-adjusted to be at about 900 and 1700 MHz for covering GSM850/900/1800 operations. Also note that the excited 0.5λ dipole-like resonant mode at about 900 MHz has a dual-resonant behavior caused by the use of the coupling feed, hence resulting in a wide operating band capable of covering GSM850/900 operations. With the excited dipole-like resonant modes contributed by the two ground planes of the clamshell mobile phone, the proposed PIFA is only required to provide a resonant mode for covering GSM1900 and UMTS bands. For this reason, only one short resonant strip for the proposed PIFA is required. This behavior leads to a small printed area of 10 × 40 mm2 required for the proposed PIFA. Moreover, when the clamshell mobile phone is in the idle condition, the proposed PIFA is still promising to cover WWAN operation with acceptable radiation efficiency. The SAR [1] results in 1 g of head tissue from exposure to the antenna radiation of the studied clamshell mobile phone are also tested, and meet the specification of 1.6 W/kg required for practical applications. Details of the proposed antenna and obtained results are presented and discussed.