Wideband Low-Profile Printed Inverted-L Antenna in Mobile Phones for WLAN/WiMAX Application

Wei NI  Nobuo NAKAJIMA  

IEICE TRANSACTIONS on Communications   Vol.E93-B   No.9   pp.2451-2454
Publication Date: 2010/09/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.2451
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Antennas and Propagation
wideband,  monopole,  mobile phone,  WLAN,  WiMAX,  

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This letter presents a low-profile printed monopole wideband antenna for mobile terminals. The proposed antenna is simply structured with an inverted-L strip, which occupies the small area of 3180.8 mm3 (0.023λL0.138λL0.006λL at lower frequency edge of 2.3 GHz) on a substrate which is perpendicular to the circuit board of the terminal. The height of the upright substrate is only 3 mm (3.8 mm including the circuit board). The proposed antenna achieves a 10-dB impedance bandwidth of 59.7% ranging from 2.16 GHz to 4 GHz, which can cover which can cover the 2.4 GHz WLAN (2.4-2.4835 GHz) and WiMAX (2.3-2.4/2.495-2.69/3.4-3.6 GHz) operational bands. It is suitable for application to a multiband mobile phone due to its relatively low profile.