Showing papers by "Brian P. Gaucher published in 2003"

Antennas integrated with metallic display covers of computing devices

Abstract: Antennas for use with computing devices such as laptop computers. In one embodiment, the antennas are integrally formed on a metallic covering of a computing device. In another embodiment, the antennas are integrally formed on a metallic cover of a display unit of a laptop device. For instance, one or more antennas are integrally formed on one or more of the bent edges (sidewalls) of the metallic cover of a display unit (i.e., sides of the cover that are perpendicular to the plane of an LCD unit). In other embodiments, one or more antennas are integrally formed on the metallic cover of the display unit in areas between the LCD and the sidewalls.

Developing integrated antenna subsystems for laptop computers

Abstract: The design, development, testing, and integration methodology for antennas integrated into laptop computers is described. Two key parameters are proposed and discussed for laptop antenna design and evaluation: standing wave ratio (SWR) and average antenna gain. A novel averaging technique was developed and applied to these to yield a measurable, repeatable, and generalized metric. A prototype antenna was built using this methodology, and measurements indicate that the resulting design attains both performance and cost targets. A PC-card-version wireless system is also discussed and compared with the integrated one. The impact of the antenna on the overall wireless system is studied through a link budget model.

A triband antenna for WLAN applications

Abstract: The design and analysis of a new triband antenna have been presented. The antenna is suitable for use in hand-held or other mobile devices and offers advantages in size, cost, and performance. The antenna can be built on a double-sided printed circuit board (PCB) or stamped from thin sheet metal. The antenna can also be built as an on-board antenna to reduce the manufacturing cost. The antenna design is patent pending.

Performance analysis of inverted-F and slot antennas for WLAN applications

Abstract: Many antenna types can be used for laptop integrated wireless applications. However, the most popular ones are the inverted-F (INF) and slot antennas or the variations of these two types due to their simple design, easy integration, low cost and overall performance. The goal of this paper is to highlight the characteristics of these two types of antennas.

A dualband WLAN access point antenna

Abstract: In this paper, the simulation results of a dual band access point antenna for WLAN applications have been presented. As shown in the results, the input impedances at the center of both bands are about 50 ohms. Therefore, an additional matching network is not necessary. This means there is no efficiency loss due to adding matching networks. The radiation patterns are basically omnidirectional. Although the 2.4 GHz and 5 GHz bands are used here, similar results can be obtained for the GSM and DCS band, and 900 MHz and 2.4 GHz ISM bands. The grounded monopoles with the same length are used in the analysis. However, different lengths can be used for radiation pattern control, especially to reduce the gain variations in the 5 GHz band. Furthermore the design ideas presented here can be used for tri-band applications if the grounded monopoles with different lengths are used.