CPW Fed Koch Modified Fractal Antenna Backed with Partial Ground for Multiband Wireless Applications

Abstract

In this article, modified Koch fractal geometry-based patch antenna up to second iteration is implemented with partial ground configuration to achieve multiband response with wideband behavior at each of the resonating bands. The antenna is designed to operate over C and X bands that can be useful for Satellite, Radar and DBS TV applications. FR-4 epoxy substrate of maximum dimension 35×30×1.6 〖mm〗^3 (0.70λ_0×0.6λ_0×0.03λ_0 ) is used to simulate the antenna in HFSS 15 (λ_0 is the free space wavelength corresponding to the lowest resonance frequency). The design is started with a truncated star shape patch and ended up with five circular slots embedded Koch fractal through several design steps. In addition, coplanar waveguide (CPW) feeding is applied to achieve multiband response and wideband behavior over each operating band. The proposed antenna exhibits multiband response at 6.06 GHz, 9.76 GHz, 10.92 GHz, 11.68 GHz and 14.4 GHz with operating bands (5.8 – 6.31 GHz), (9.2 – 10.08 GHz), (10.78 – 12.36 GHz) and (13.64 – 15 GHz) respectively. A fabricated prototype of the proposed antenna is tested using Vector Network Analyzer (VNA). It has shown adequate amount of matching between the simulation and measured results.