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Title: Bandwidth enhancement and size reduction of microstrip slot antennas
Authors: Latif, SI
Shafai, L
Sharma, SK
Keywords: dual slot antenna
finite ground plane
microstrip line feed
microstrip slot antenna
polarization diversity
wide bandwidth
Issue Date: 31-Mar-2005
Citation: 0018-926X; IEEE TRANS ANTENNAS PROPAGAT, MAR 2005, vol. 53, no. 3, p.994 to 1003.
Abstract: Reduced size microstrip monopole slot antennas with different slot shapes-straight, L and inverted T, and placed on a small ground plane, are investigated. The ground plane size is 50 mm x 80 mm, which is about the size of a typical PC Wireless card. Detailed simulation and experimental investigations are conducted to understand their behavior and optimize for broad-band operation. It is shown that, the variation in the slot shape, from straight to L and T shapes, helps in generating additional resonances, which when coupled to the original resonances of the slot, further increases impedance bandwidths. The bent shapes of the L and T slots reduce their height and provide more space on the ground plane for electronics. A mirror image dual L-slot antenna, placed at two adjacent corners of the ground plane, is also investigated and optimized for the polarization diversity. They provide an impedance bandwidth of 87 %, with near orthogonal radiation characteristics. The measured impedance bandwidths (S-11 = -10 dB) of up to 60%, 84%, and 80% are achieved for these straight, L and inverted T slots respectively, by suitably selecting their design parameters. The simulation results are in good agreement with the experimental data considering several practical issues.
Appears in Collection(s):Research Publications (UofM Student, Faculty and Staff only access)

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