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A metal-frame inverted-F antenna for the metal-casing smartphone is presented. The antenna is formed by two inverted-F Antenna (IFA) structures to cover 824–960 MHz (low band), 1710–2690 MHz (middle band), and 3400–3600 MHz (high band). The antenna for the metal-casing smartphone has a narrow metal clearance of 2 mm. The feeding and shorting strips with matching networks for the two IFAs are disposed...
A very‐low‐profile hybrid antenna for the LTE smartphone was presented. The antenna structure was mainly formed by a T‐shaped open slot disposed on the main circuit board inside the smartphone casing and a metallic patch printed on the inner surface of the frame around the smartphone casing. The antenna with the T‐shape open slot and the on‐frame metallic patch had a very low profile of 3 mm. By using...
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