Wrapped Microstrip Antennas for Laptop Computers

Abstract

The objective of this article is to provide a comprehensive and unified description of the authors' work on the development of wrapped microstrip antennas for laptop applications. The first contribution is the introduction of quasi-omnidirectional wrapped-microstrip antenna elements to be integrated into the display rim of laptops. Single-and dual-band antennas are presented to demonstrate the capabilities of wrapped microstrip antenna elements in wireless communications. The prototyping and measurements of these antennas are highlighted in an appendix. The most common internal and external laptop antenna structures are also described, to give a broader overview of laptop antenna-design approaches. The second and third contributions are a methodical analysis of housing effects, and a general study of electromagnetic human interaction with laptop antennas from the antenna-performance-degradation and user-illumination perspectives. These studies have been performed systematically for several classes of internal and external antennas, with different locations and screenopening angles. With this approach, a general overview of laptop-antenna integration aspects is given, along with unified gUidelines for the design of the wireless interface used in modern laptops. An application of the novel elements to capacitypreserving MIMO arrays is also presented.

Numerical evaluation of human exposure to WiMax patch antenna in tablet or laptop

“…The SAR values presented in Table have been normalized to an antenna output power of 1 W, while wireless antennas in laptops or tablets can generally operate at a peak power of no more than 100 mW. Typically, a WiMAX antenna radiates a time‐massed average power of 10 mW [Guterman et al, ; Findlay and Dimbylow, ].…”

“…operate at a peak power of no more than 100 mW. Typically, a WiMAX antenna radiates a time-massed average power of 10 mW [Guterman et al, 2009;Findlay and Dimbylow, 2010]. After scaling, the calculated whole-body SAR exceeds the ICNIRP limits (0.08 W/kg) for only one exposure condition: male child exposed to EM field generated by the antenna placed at nasion-level in near position and parallel orientation (Table 2: SAR max ¼ 0.11 W/kg @ 10 mW).…”

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

“…By further using a narrow front section of width 0.2 mm and length 32 mm for the longer strip, the longer strip can generate a fundamental resonant mode at about 950 MHz and a higher‐order resonant mode at about 2400 MHz for the proposed antenna. In this design, the narrow front section functions like a printed distributed inductor [19–26], which contributes additional inductance to compensate for the increased capacitance with a decrease in the resonant length. Thus, with a length of 68 mm only, a fundamental resonant mode at about 950 MHz can be generated by the longer strip of the two‐strip monopole.…”

Design of planar inverted‐F antenna over uniplanar EBG structure for laptop mimo applications

“…Many researchers have reported many designs. Some designs used traditional techniques to design single element antenna or MIMO antenna for laptop applications. The system reliability can be increased by proper selection/combining of the received signals.…”