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A patch microstrip antenna with an inverted-V ground plane capable of improving radiation performance for a wireless local area network (WLAN) access point in the 2.4-GHz band is presented. By using a feeding structure composed of a step-shaped feeding strip in the air substrate and a coplanar strip in the narrow radiating patch, the proposed antenna can reduce cross-polarisation radiation (less than -20 dB) for frequencies across the 2.4 GHz WLAN band. The inverted-V ground plane comprises a narrow central ground portion for setting the 50 Ω subminiature version (SMA) connector for the patch antenna and two bent ground portions to control the broadening of the antenna's horizontal radiation pattern. By selecting the proper dimensions, the proposed antenna can have a wide horizontal radiation pattern of about 152° (3 dB beamwidth) with vertical polarisation, which is very suitable for WLAN access-point applications where uniform radiation in one direction or one half-space is required. Experimental results of a constructed prototype suitable for application in the 2.4 GHz WLAN access point are presented and discussed. [ABSTRACT FROM AUTHOR]

A compact patch antenna suitable for mounting above a conducting plate for WLAN operation in the 2.4 GHz band is presented. It is demonstrated that, by introducing a supporting metal plate connected to the antenna ground below, the proposed antenna in free space can easily be mounted at the corner of a conducting plate of various dimensions without rapidly deteriorating the antenna bandwidth. With a compact size of 20×20×6 mm, the antenna can be placed very close to a conducting plate of side length varied from 20 to 200 mm for application in a PC peripheral device. [ABSTRACT FROM AUTHOR]

A technique that can reliably monitor exercise intensity plays an important role for the effectiveness and safety of an exercise prescription. A universal algorithm for the recursive estimation of exercise rate during a variety of aerobic exercises using measurements from a body-mounted triaxial accelerometer (TA) is proposed. Information about the type of exercise is not required by the algorithm and the TA can be mounted at the same location regardless of the exercise type. The algorithm involves period detection and data fusion. Experimental results demonstrate that the algorithm is effective for common aerobic exercises. [ABSTRACT FROM AUTHOR]

A new compact patch antenna, which is arranged perpendicular to a circular ground plane, for WLAN operation is presented. The antenna consists mainly of one driven patch and one shorted parasitic patch, both of which wind along two concentric circles. A constructed prototype covering the 2.4 and 5 GHz WLAN bands is demonstrated. Good broadside radiation characteristics are obtained across the operating bands. Details of the proposed patch antenna and experimental results are presented and discussed. [ABSTRACT FROM AUTHOR]