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This paper presents a printed quasi-self-complementary antenna fed by a 50-Ω microstrip line. A quarter-circular disc and a complementary quarter-circular slot in the mirror side on the ground plane are proved in ultra-wideband applications [1]. By inserting an inverted L-shaped slit embedded on the quarter-circular disc, a destructive interference can take place and cause the antenna to be nonresponsive...
A novel, compact X-shaped slotted square-patch antenna is proposed for circularly polarized (CP) radiation. A cross-strip is embedded along the X-shaped slot for a novel proximity-fed technique to produce CP radiation in the UHF band. In the proposed design, two pairs of T-shaped slots are etched orthogonally on the square patch, connected to the center of the X-shaped slot for CP radiation and antenna...
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