Abstract
AbstractA very‐small‐size printed loop antenna for mobile phone application is proposed. The antenna has a loop strip of length 62 mm only, which is folded into an L‐shape and occupies a small area of 96.5 mm2 on the top no‐ground portion of the system circuit board of the mobile phone. By incorporating a simple matching circuit formed by a chip capacitor and a chip inductor, both in series, the loop antenna can generate three resonant modes (0.25‐, 0.5‐, and 1.0‐wavelength modes) at about 925, 1800, and 2200 MHz. The 0.25‐wavelength mode forms the antenna's lower band covering GSM operation, whereas the 0.5‐ and 1.0‐wavelength modes form the antenna's upper band covering DCS/PCS/UMTS operation. Quad‐band operation is hence obtained for the printed loop antenna, although it has a very small size. Details of the proposed antenna are presented. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 184–192, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24008
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