Self-Complementary Inverted-FL Antenna Using Electromagnetic Coupling Feed for Mobile Phone

Nobuyasu TAKEMURA

Publication
IEICE TRANSACTIONS on Communications   Vol.E95-B    No.4    pp.1329-1337
Publication Date: 2012/04/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.1329
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Antennas and Propagation
Keyword: 
self-complementary,  inverted-F antenna,  inverted-L antenna,  electromagnetic coupling feed,  broadband,  multi-band,  mobile phone,  

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Summary: 
In this paper, the author proposes an electromagnetic coupling fed inverted-FL antenna design. The inverted-FL antenna with a self-complementary structure has been reported as a way to achieve a constant impedance of 188 ohms without the need for a matching load, since the axially symmetric self-complementary antenna has constant impedance, even though it has a finite structure. This design has been realized by integrating an inverted-F antenna with a self-complementary structure for achieving a broadband characteristic and an inverted-L element for operation on a frequency lower than the minimum frequency of the antenna. The proposed antenna realizes a broadband characteristic without attaching the matching load and the impedance transformer to match 50 ohms. The impedance transformer necessary for the inverted-FL antenna with a self-complementary structure is removed by using an electromagnetic coupling feed structure. This antenna, which has a volume of 101045 mm3, obtained broadband and multi-band characteristics covering the GSM850/GSM900/DCS/PCS/UMTS2100/UMTS2600 bands and the 2.5 G/3.5 G bands for Mobile-WiMAX in simulation and measurement.