Analysis of microstrip fractal multilevel antenna with CPW and ground plane
partial removal for band-C and band-S applications
fractal antennas, microwave circuits, CPW, axial ratio, band-C and band-S, wireless communication
This work has as main objective to make the design and analysis of different structures for planar microstrip antenna with partial removal of the ground plane with the use of fractal curves. Recently, studies show that some parameters, such as the shapes of the antenna patch and the ground plane when geometrically altered, producing changes in the distribution current density of the planar structure and therefore the resonant modes, the radiation characteristics and polarization antenna. This paper presents a novel fractal antenna using the technique of insertion fractal slots and defects in the ground plane and discontinuities ¼ transformer wave transmission line in order to increase the bandwidth and insertion in line power for three specific behaviors frequency band applications. We used the FR4 substrate with dimensions of 85.0 x 85.0 x 1.57 mm³. In addition, we used different modes of impedance matching in line antenna feed as CPW (Coplanar Wave Guide), to change the width of the transmission line in order to obtain a variation in the current distribution and hence the response bandwidth for impedance S11≤10 dB for C band (3.9 GHz - 6.2 GHz) and S band (2.0 GHz - 4.0 GHz). An analysis is performed for the antenna feed in cases of microstrip and CPW line when circularly polarized antenna is obtained. Good agreement was obtained between measured and simulated results. The fractal antenna microstrip proposal can be easily designed, built and is a strong candidate for use in mobile communication systems in bands C and S.