Abstract
ABSTRACTThe open‐slot antenna is very suitable for applications in the metal‐framed tablet device, such as the tablet computer, to achieve a low profile with wideband or multiband operation. This article presents a U‐shape open‐slot (U‐slot) antenna with a low profile of 7 mm to the top edge of the metal‐framed tablet computer for the LTE operation. The U‐slot has a simple structure of length 70 mm and the two slot openings thereof are disposed at the metal frame. The U‐slot antenna is fed using an end‐shorted 50‐Ω microstrip feedline, with a wideband matching network embedded therein. The antenna can support a 0.5‐wavelength slot resonant mode supported by the U‐slot itself and a 0.25‐wavelength slot resonant mode created by the open‐slot radiator (denoted as Slot 1 in this study) formed between one slot opening and the microstrip feedline as a virtual shorting. By further using an inverted‐U strip connecting across the U‐slot, the antenna can create an additional open‐slot radiator (denoted as Slot 2 in this study) to generate a 0.25‐wavelength slot resonant mode at lower frequencies. The resonant modes supported by the U‐slot, Slot 1, and Slot 2 can form two wideband operating bands to cover the LTE operation in the 698–960 and 1710–2690 MHz bands. Details of the proposed U‐slot antenna and the effects of the inverted‐U strip connecting across the U‐slot and the matching network are addressed. Experimental results of the fabricated U‐slot antenna are also presented. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 55:2677–2683, 2015
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