A new bandwidth‐enhancement method of using a resonant open slot embedded in the ground plane or supporting metal frame of the display panel for a small‐size internal wireless wide area network (WWAN) laptop computer antenna is presented.To demonstrate the results, a small‐size printed monopole slot antenna with a length of 50 mm only, which is about the smallest among the internal WWAN laptop computer antenna that have been reported, is applied in this study. For such a small‐size WWAN antenna, the impedance matching in the 900‐MHz band is usually very poor and hence the obtained antenna's lower band cannot cover the desired GSM850/900 operation. By embedding a resonant open slot in the ground plane, which does not increase the size of the internal WWAN antenna, a wideband resonant mode with good impedance matching at about 900 MHz contributed by the resonant open slot can be generated to cover the GSM850/900 operation. Further, a wide upper band for the antenna to cover the GSM1800/1900/UMTS operation can also be obtained. Details of the proposed bandwidth‐enhancement method are studied in this article.
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Wong et al. (2010) studied this question.
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