CPW-Fed Monopole Antenna for RCS Reduction in X-Band Applications

This paper presents the design of CPW-fed monopole antenna for RCS reduction in the X-band. A basic CPW-fed monopole antenna is designed using FR-4 substrate and parameters such as return Loss, VSWR, gain, and monostatic and bistatic RCS are analyzed. A single artificial magnetic conductor (AMC) cell of size 50 mm × 15 mm is introduced on the basic structure and its RCS is studied. The resultant RCS was found to be more than that of the basic antenna. The size of the AMC cell is diminished to 4 mm × 2 mm and the periodicity of the cells is increased on the surface of basic antenna. With the introduction of AMC cells, reactance on the surface of the antenna is modified resulting in the alteration of scattering properties and hence RCS is reduced. The simulation study has been done by incorporating HFSS 2016.1 platform. From the simulation results, monopole antenna with AMC cells exhibits more than 10 dB RCS (monostatic and bistatic) reduction when compared with the other two antenna designs and the remaining parameters are maintained at the same level (for all the three designs).