In this paper, a simple and compact ultra-wide band (UWB) microstrip planar antennawhich is fed by a co-planar waveguide (CPW) is developed and analyzed. The proposed design is setup on a FR-4 substrate with a dimensionof 31 x 34 x 1.6 mm3 with a di-electric constant (εr) of 4.4. The patch is a combination of two elliptical shaped structures with two slots etched on it. The proposed antenna operates at frequencies ranging from3 – 12.53 GHz with resonance frequencies at 3.95 GHz and 9.2 GHzhavingreturn loss of -22.21 dB and -32.97 dB respectively. The variation of the slot area and the length of ground is analyzed. The proposed antenna can be best suited for the applications where ultra-wideband is preferred which include WLAN, WiMAX, ISM, satellite frequency bands that include S-band, C-band, X-band and also ITU band. The design and simulation are carried out using the Ansys HFSS Tool version 2021.2, which is based on the Finite Element Method (FEM).

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