asymmetrical-fed rhcp wide-band slotelement for x-band applications

An outstanding square slot element, for x-band wirelessapplications with asymmetric coplanar waveguide fed (cpw) isproposed. various shapes of metallic strips are utilized as groundedstubs for providing right hand circular polarization (rhcp)functionality and wide-band properties. by adjusting the proposed stubsand hook-shaped radiator, length and positions, wider impedance bandwidth is obtained in x-band. in addition, asymmetric feeding techniqueis employed with semi-hook shaped radiating patch for efficientimpedance matching and generating new resonances. by usingrectangular slot and semi-hook shaped radiator good impedancematching is achieved in frequency band. besides that, by introducingstrips in ground plane, rhcp is achieved in x-band. the antenna size isonly about 25 × 25 × 1 mm^3, which covers the band from 6.5-12.9 ghzfor s11 < -10db. in addition, by variation of stubs' size and hook shapedpatch parameters, the axial ratio (ar) and impedance bandwidths andresonances are controlled. the ar bandwidth of element covers from9.5 to 11.8ghz. both simulated and measured results are evaluated andcompared to certify element’s efficient characteristic.