Planar Monopole Antenna With Two Coupled Strips for Internal Eight-Band Lte/Wwan Laptop Computer Application

In this paper, a compact planar monopole antenna with eight-band LTE/WWAN (LTE700/2300/2500/GSM850/900/1800/ 1900/UMTS) operation for laptop computer application is presented. This design structure comprises a bent driven strip and two coupled strips, which can contribute multiple resonance modes to combine two wide operating frequency bands covering 665–1023 MHz and 1612– 2924MHz. The proposed antenna fed by a 50-Ω coaxial cable occupies a small size of only 65(L)× 11(W)× 0.4(H)mm3, so it can be flexibly embedded inside the casing of the laptop computer as an internal antenna. A fabricated prototype of the antenna is tested and analyzed. Experimental results exhibit that nearly omnidirectional coverage and stable gain variation across the desirable LTE/WWAN bands can be obtained with the antenna.