Abstract
Microstrip-line fed annular ring circularly polarized antenna is proposed in this work. The antenna is fabricated on a disk-shaped FR-4 substrate with annular ring slots etched in the ground. The overall space requirement of the antenna is 25 × 25 × 1.6 mm3. The antenna is modeled for triple notch wide band circular polarization operation in the frequency range from 2–4 GHz. A wide impedance band operation is be obtained by the introduction of slots and stubs. An impedance band- width of 1.8 GHz is accomplished with three notches at 2.4, 2.8, and 3.3 GHz.
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