Design of split ring antennas for WLAN and WiMAX applications
This paper compares the design of two compact monopole antennas based on metamaterial inspired split ring structures. The effect of orientation of split axis to the direction of an incident EM wave is discussed. When the axis of the split is parallel to the direction of EM wave propagation, it results in a narrow band creation and when it is perpendicular, it leads to a notch frequency. Antenna 1 is intended for WLAN (2.4/5.2/5.8 GHz) application whereas antenna 2 operates on both WLAN and WiMAX (3.5 GHz) frequency bands. Both the antennas are printed on a 30 x 30 x 0.8 mm3 FR 4 substrate with a partial ground plane and is fed by a microstrip line. The structures mainly differ in their split positions. Analysis of the split ring structures is also discussed. Prototype of the proposed structures are fabricated and the measured results comply greatly with the simulated results. The antenna has consistent radiation pattern over all the working region. (c) 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2117 2122, 2016