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A circularly polarized small-size microstrip antenna with a cross slot

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1 Author(s)
H. Iwasaki ; Res. & Dev. Center, Toshiba Corp., Kawasaki, Japan

An antenna with a low profile, small size, and a light weight is required in mobile satellite communications. A new, circularly polarized small-size microstrip antenna using a proximity coupled feed method is proposed. A simple configuration based on a cross slot with unequal slot lengths on a circular patch is adopted to realize a small-size element antenna. The proposed antenna has no 90° hybrid coupler for circular polarization. The measured results verify the circular polarization, and the antenna radius was reduced by about 36% by using the slot lengths which are nearly equal to the diameter of the circular patch antenna. Good impedance and axial ratio characteristics have been obtained

Published in:

IEEE Transactions on Antennas and Propagation  (Volume:44 ,  Issue: 10 )