Multi - band fractal antenna modeling

ABSTRACT: This thesis demonstrates the design procedure of a multilayer fractal patch antenna to be used. A novel combination structure of fractal geometries arranged in two stacked layers that allows a multiband/wideband operation has been utilized for the proposed antenna. Rectangular and triangular patches are used in layer 1 and layer 2, respectively. A combination of Sierpinski Carpet Fractal (SCF) geometry and Minkowski Fractal (MKF) geometry is used as layer 1; Layer 2 composed of the combination of Koch Snowflake Fractal (KSF) with Sierpinski gasket geometry (SGG). Layers’ separation has been achieved by using 4 mm air layer for the purpose of surface wave reduction. Proximity coupled feed technique with 50 Ω microstrip line is used. Both the radiating layers and the feeder are placed on 1.59 mm thick FR4 substrate. The simulation results show that the antenna can operate at 11 different resonance frequencies 2.08, 2.32, 3.17, 4.04, 4.49, 5.14, 6.20, 7.35, 9.22, 11.1, 11.98 (GHz), with bandwidths of 61, 36, 204, 82, 349, 673, 1142, 1481, 507, 1770 and 530 (MHz) respectively. Gain values up to 6.03 dB were obtained. Keywords: Multiband/Wideband antenna, Fractal geometries, Multilayer patch antenna, Proximity coupled feed technique. …………………………………………………………………………………………………………………………