A simple teclmique for, reducing the sidelobe stnicture in tlie radiation patteni of phased arrays is prcsenled. Tlus techniqne uses an auxiliary antenna consisting of two or four elements in conjunction with the liiain array. Tlie two 'elements produce a cosine pattern of constant amplitude. The four elenients can produce a sine pattern w:itIi vaqing amplitude depending npon rlie size of the auxiliay a n t e m . Adding or subtrdcting the pattern of the anxiliaq antenna lo the pattern or the iliain array will result in a new pattern with reduced sidelobes. Results of computer siniulations showed good iniproveineius in the sidelobe stnicture.

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Indoor propagation study for WLAN system operating at 2.452 GHz was performed at university building. Theoretical analysis, and simulation results, obtained from the Insite software package, as well as experimental measurements were performed to estimate propagation exponent and wall penetration loss. The experimental data have validated the simulation results. The estimated exponents were found between 1.45 -2.2, and average wall penetration loss of about 3.5 dB.

<p>The propagation of radio waves inside a typical university building is investigated by simulation and measurements. The Line of sight (LOS) and Obstructed Line of sight (OLOS) propagation scenarios were considered. The received power from a WLAN access point operating at 2.45GHz was determined from the simulations and measurements at various positions, orientations, and heights of the Tx and Rx antennas. The path loss exponents were estimated from the obtained simulation and measurement results of the received power variation with distance. The obtained path loss exponent values were found between 1.15-1.63 for LOS propagation and 2.14-2.55 for OLOS.</p>

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