Summary
International Symposium on Antennas and Propagation
2009
Session Number:1B2
Session:
Number:1B2-1
Printed Monopole with a Distributed Inductor for Penta-Band WWAN Internal Mobile Phone Antenna
Chih-Hua Chang, Kin-Lu Wong,
pp.69-72
Publication Date:2009/10/21
Online ISSN:2188-5079
Summary:
The chip-inductor-embedded small-size printed monopole for WWAN (wireless wide area network) operation in the mobile phone has recently been demonstrated [1]. The printed monopole occupies a small area of 15 x 34 mm2 on the no-ground portion of the main circuit board of the mobile phone and generally shows no thickness above the circuit board, which is very attractive for thin-profile mobile phone or laptop computer applications. The much reduced size of the chipinductor-embedded monopole is mainly owing to the additional inductance contributed by the chip inductor to compensate for the increased capacitance resulting from the decreased resonant length of the monopole [2, 3]. However, with the lumped chip inductor, additional process in the fabrication of the antenna is required, which increases the fabrication cost. In this paper, we present a printed monopole embedded with a printed narrow strip as a distributed inductor for application in the mobile phone to achieve GSM850/900/1800/1900/UMTS penta-band WWAN operation. The printed distributed inductor replaces the lumped chip inductor, leading to an all-printed structure for the proposed small-size monopole applied as an internal WWAN mobile phone antenna. The proposed printed monopole hence can be implemented at low cost. In addition, it has a similar small size as that in [1] for the case of using a lumped chip inductor and can be printed on a no-ground portion of 14 x 40 mm2 on the main circuit board of the mobile phone (see Fig. 1). Further, the use of a distributed inductor can decrease the possible losses associated with the use of a lumped chip inductor (such as the conductive loss associated with the bending and winding of the strips in the chip inductor and the dielectric loss in the chip element). Detailed effects of the printed distributed inductor on the proposed small-size monopole are studied in this paper. Details of the results are presented and discussed.