Design, Fabrication and Characterization of Circularly Polarized Patch Antenna

Abstract

A novel design for circularly polarized patch antenna with quadruple stubs embedded spider web shaped dual band circularly polarized patch with partial and defected ground structure is presented in this dissertation. The designed antenna is fed by a single feed. It is a dual band circularly polarized patch antenna for S and C band with quadruple stubs and partial ground. It comprises of four stubs with variable width and length alongside defected rectangular patch and partial and defected ground structure (DGS) constituting of ‘rectangular tower’ square shaped slots. The proposed antenna radiates a circularly polarized wave and covers the dual bands with a bandwidth of 2.69 - 2.75 GHz (Bluetooth, Wi-Max, W-LAN and LTE) and 4.7 - 5.5 GHz (Wi-Fi). The operating frequency and reflection coefficient is dependent on the length and width of the stubs whereas axial ratio of the circularly polarized wave is administered by the defects of the ground plane. The steepness of reflection coefficient is controlled by the defects in the central rectangular patch and the axial ratio is monitored by the slots in the ground plane. The prototype of circularly polarized patch antenna is designed and fabricated on Rogers RT DUROID (5880) resulting in a very compact and efficient design. The measured and simulated results of the circularly polarized patch antenna are observed to be in good accordance with each other.