Study of coupled-fed shorted monopole with a radiating feed structure for LTE/WWAN laptop computer applications

A coupled-fed shorted monopole with its feed structure as an effective radiator for 8-band LTE/WWAN operation in the laptop computer is presented. The radiating feed structure capacitively excites the shorted monopole. The feed structure mainly comprises a long feeding strip and a loop feed therein. The loop feed is formed at the front section of the feeding strip and connected to a 50-Ω mini-cable to feed the antenna. Both the feeding strip and loop feed contribute wideband resonant modes to combine with those generated by the shorted monopole for the desired 8-band operation. The antenna size above the top shielding metal wall of the laptop display is 4 × 10 × 80 mm³ and is suitable to be embedded inside the casing of the laptop computer. The proposed antenna is fabricated and tested, and good radiation performances of the fabricated antenna are obtained. Details of the proposed antenna are presented and discussed.