This paper presents the design of a super slim multiband wrapped inverted-F antenna that covers the frequency bands allocated for GSM, DCS and PCS wireless services. In the first step, the quarter-wavelength size (at 850 MHz) open-end arm of an inverted-F radiator is folded and meandered. Then the antenna is wrapped using a fourth-order folding technique to reduce its projection area to only 40 x 10 x 3mm. Full wave EM simulations show that the antenna excites a lower mode resonance at about 850MHz and a higher one at about 1900MHz. Its radiation pattern is nearly omni-directional with a gain of about 2.5dBi at the lower band and 4.6dBi at the upper band. A prototype of the proposed antenna is fabricated and tested. A close agreement between simulated and measured result is achieved. The measured 6-dB return loss or VSWR 3:1 bandwidths for the lower and upper resonances are 200MHz (770 to 970 MHz) and 280MHz (1710 to 1990 MHz) respectively. These bandwidths are sufficient to cover GSM 850/900/1800/1900MHz, DCS 1800MHz and PCS 1900MHz bands. Because of its compact volume the proposed antenna is a very attractive candidate for modern slim size portable transceivers.
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机译：本文介绍了一种超薄多频带包裹式倒F天线的设计，该天线覆盖了分配给GSM，DCS和PCS无线服务的频带。第一步，将倒F型辐射器的四分之一波长尺寸（在850 MHz下）的开口臂折叠并曲折。然后，使用四阶折叠技术将天线包裹起来，以将其投影面积减小到仅40 x 10 x 3mm。全波电磁仿真表明，该天线在大约850MHz处激发较低的模式谐振，而在大约1900MHz处激发较高的谐振。它的辐射方向几乎是全向的，在较低频段的增益约为2.5dBi，在较高频段的增益为4.6dBi。拟议天线的原型已制造并测试。在模拟结果和测量结果之间取得了紧密的一致性。对于较低和较高的谐振，测得的6 dB回波损耗或VSWR 3：1带宽分别为200MHz（770至970 MHz）和280MHz（1710至1990 MHz）。这些带宽足以覆盖GSM 850/900/1800 / 1900MHz，DCS 1800MHz和PCS 1900MHz频段。由于其紧凑的体积，建议的天线是现代超薄便携式收发器的极具吸引力的选择。
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