Simple two‐strip monopole with a parasitic shorted strip for internal eight‐band LTE/WWAN laptop computer antenna

Abstract

AbstractA dual‐wideband internal antenna formed by a simple two‐strip monopole (a longer strip and a shorter strip) and a parasitic shorted strip for eight‐band long tern evolution/wireless wide area network operation (698–960/1710–2690 MHz) in the laptop computer is presented.The parasitic shorted strip is excited capacitively by the shorter strip of the two‐strip monopole and contributes two resonant modes to the antenna, with one in the lower band and one in the upper band, thereby effectively widening the bandwidths of the antenna's two operating bands. Further, the parasitic strip short‐circuited to the top shielding metal wall of the display ground in the laptop computer is configured such that its end section with the shorting point is positioned at the side edge of the antenna. This configuration allows the antenna to be placed closely to a nearby grounded plate, with very small effects on the performances of the antenna. This is an advantage for the proposed antenna in practical applications since the antenna requires a very small isolation distance at its side edge to nearby metal objects (such as a metal screw at the top shielding metal wall to fix the display ground to the casing of the laptop computer). Hence, in addition to the small antenna volume of 4 × 12 × 70 mm3 at the top shielding metal wall, compact integration of the proposed antenna along the shielding metal wall of the display ground can also be obtained. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53:706–712, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25836