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A compact quad-band internal antenna for 3G mobile phone is presented. A novel technique which can control low/high resonant frequencies of the multi-band antenna independently is employed for easy optimization of the antenna characteristics over all frequency bands. The designed single plate antenna consists of a planar antenna with U-shaped slot for high band and a vertically attached spiral monopole...
A novel five-band planar inverted-F antenna (PIFA) for mobile phones is presented. In this antenna, helical feed, folded patch, and two long slots are employed for compact size and wide bandwidths. Specially, the two slots are effectively used to design low/high resonant frequencies independently. The designed antenna with size of 38 times 12 times 7 mm3 covers DCN (824-894 MHz), GSM (880-960 MHz),...
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