A novel compact circular polarization (CP) design of a single-feed equilateral-triangular microstrip antenna with a Y-shaped slot is presented. The Y-shaped slot is cut in the patch with its upper two arms facing either the triangle tip or the bottom side of the triangular patch. Results show that, with a proper size of the Y-shaped slot, the present proposed design can have an antenna size reduction up to about 19% for operating at a given frequency for circular polarization, as compared to the regular-size circularly polarized triangular microstrip antenna. The proposed antenna design is described and studied.
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Yang et al. (1999) studied this question.
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