Internal planar WWAN laptop computer antenna using monopole slot elements

Abstract

A planar WWAN (wireless wide area network) antenna comprising two monopole slots operated at their quarter‐wavelength modes for GSM850/900/1800/1900/UMTS operation in the laptop computer is presented. With the use of monopole slot elements, the antenna can be easily printed on an inexpensive FR4 substrate and show a planar structure for promising applications in the thin‐profile laptop computer. The antenna can provide two wide operating bands at about 900 and 1900 MHz to cover all the five operating bands for WWAN operation and yet occupies a small area of 10 × 75 mm2 in the narrow spacing between the display and the laptop computer casing. The user's hand effects on the antenna performances when the touch panel or touch screen is used for the laptop computer are also studied. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1274–1279, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24336

Bandwidth enhancement of small‐size internal WWAN laptop computer antenna using a resonant open slot embedded in the ground plane

“…Substrate-integrated waveguide (SIW) technology has found many applications in the millimeter-wave frequency range, for example [1,2], because it presents a reasonable compromise between microstrip and rectangular-waveguide circuitry. One of the advantages for the design of SIW components is that after dispersion characteristics and via hole dimensions have been related to all-dielectric-filled rectangular waveguides [3], traditional waveguide design strategies, for example, [4], can be used. Moreover, tapers to microstrip technology [5] provide an interface to measurement equipment.…”

“…While in Ref. 3, only two monopole slot elements are needed; however, the required antenna length is increased to be 75 mm. When the antenna length is reduced to be 50 mm as shown in Figure 1 for the studied small-size monopole slot antenna without the embedded open slot in the ground plane, the obtained bandwidth of the antenna in the 900-MHz band is quickly decreased and cannot cover the desired GSM850/900 operation.…”

“…The printed monopole antenna for WWAN operation has been applied in the laptop computer [1,3]. In Ref.…”

“…The longer monopole slot (slot 1) having a small length of 47 mm cannot contribute to a quarter-wavelength resonant mode at about 900 MHz for the GSM850/900 operation; On the other hand, the shorter monopole slot (slot 2) having a length of 28 mm can generate a wideband quarter-wavelength resonant mode at about 2000 MHz for the GSM1800/1900/UMTS operation. The operation principle of both slot 1 and 2 has been extensively discussed in [1,3,[8][9][10][11][12][13][14][15][16][17][18][19]. They are excited as quarterwavelength resonant structures, different from the traditional slot antenna with two closed ends excited as half-wavelength resonant structures [19][20][21][22].…”

Body SAR study of the planar WWAN monopole slot antenna for tablet device application

“…Monopole slot antennas have the attractive feature of wideband operation and small size for internal mobile device antenna applications [1][2][3][4][5][6][7][8][9]. Their promising applications in the laptop computer for covering pentaband WWAN operation including the GSM850/900/1800/1900/UMTS bands (824$894/880$960/ 1710$1880/1850$1990/1920$2170 MHz) have been shown [8,9].…”