Conceptual design approach of wideband fractal dielectric resonator antenna

This study explains a novel wideband curvilinear Sierpinski fractal geometry (CSFG) based cylindrical dielectric resonator antenna. CSFG provides wider bandwidth by the combination of two important concepts: (i) reduction in volume to the surface area of the complete radiating structure, which in turn reduces the Q-factor; (ii) generation of two radiating modes inside the radiating structure HEM(11 delta)and TM01 delta. The prototype of the proposed antenna is fabricated for verifying the simulated results. Measured reflection coefficient (|S-11|) shows that the proposed antenna structure operates over the frequency range 2.2-3.5 GHz with the fractional bandwidth of 45.61%. Diversified radiation pattern, i.e. monopole (due to TM(01 delta)mode) and broadside (due to HEM(11 delta)mode) is also an important feature of the proposed antenna structure. The antenna design is relevant for WLAN (2.5 GHz) and WiMAX (3.3 GHz) applications.