Internal printed loop-type mobile phone antenna for penta-band operation

An internal printed loop-type antenna comprising a driven monopole and a coupled strip for application in GSM850/GSM900/DCS/PCS/UMTS penta-band operation is presented. The antenna is suitable to be printed on the system circuit board of the mobile phone and short-circuited to the system ground plane to form as a loop-type structure. The antenna provides two wide bands at about 900 and 1900 MHz to cover the GSM850/900 and DCS/PCS/UMTS bands, respectively. The lower band is generated by the driven monopole and coupled strip operated together as a half-wavelength loop resonant structure. The upper band is formed by two resonant modes: the first one is the driven monopole operated alone as a quarter-wavelength monopole and the second one is contributed from the driven monopole and coupled strip operated together as a one-wavelength loop resonant structure. Details of the proposed antenna are presented and discussed. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2595–2599, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22791