A small printed UWB microstrip patch antenna is proposed by Chen et.al. in [1]. The ground plane effect is reduced in the design to result in ultra wide-band (UWB) antenna performance. The design is based on Rogers 4003 substrate. A FEKO model was created for the antenna with a FEM region being used to model the substrate. In order to minimize the coupling for the FEM region to the free space MoM region the entire antenna is encased in a FEM dielectric region with the dielectric properties of air. An impressed current source is used to feed the antenna inside the FEM region and to extract S-parameters for the antenna at this feed point. Figure 1 presents the design specification from [1] and the resulting FEKO model.

Fig 1: Antenna design and FEKO model
(a) Design specification [1]	(b) 3D aspect FEKO model

The FEKO model was simulated across the band of interest to compute S₁₁ for the design. Figure 2 compares the measured and simulated data from [1] with the FEKO simulation result. The FEKO model clearly agrees well with the published result. Figure 3 shows the currents on the antenna at 6.37 GHz.

Fig 2: Reflection coeffisient result comparison
(a) Measured and simulated data from [1]	(b) FEKO simulation result

Fig 3: Surface currents at 6.37 GHz.

References