A Compact Printed Monopole Antenna With Wideband Circular Polarization

In this paper, a novel compact circularly polarized (CP) monopole wideband printed patch antenna is proposed. The antenna consists of a hook-shaped branch connected at the partial rectangular ground plane and reversed unequal arm with an L-shaped microstrip-feed which helps the antenna achieve wideband circular polarization property. The measured results display that the proposed compact (44 x 44 x 1.6 mm(3)) antenna acquires 3.12 GHz (56%, 2.25-4.0 GHz) at the 10-dB impedance bandwidth, and the axial ratio (AR) bandwidth at 3-dB is 3.48 GHz (63.61%, 2.38-4.60 GHz). A parametric study of different design parameters and measured and simulated results of the various characteristics of the designed antenna is presented to verify the performance of the radiation mechanism. Finally, by scaling only, the dimensions of the proposed antenna without changing another parameter, a wide impedance and AR bandwidth are achieved. On account of the simple planar structure and scaling dimension with broadband CP property, the proposed antenna does apply in a variety of wireless communication systems such as ISM, WiMAX, WLAN, satellite communications, cordless telephones, weather radar systems, and lower frequency bands CP type applications.