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Small Printed Ultrawideband Antenna with Reduced Ground Plane Effect

An UWB patch antenna is modelled in FEKO with FEM modelling of substrate, encasing air substrate and S-parameter extraction from a source in the FEM region. Results are compared with literature.

A small printed UWB microstrip patch antenna is proposed by Chen in [1]. The ground plane effect is reduced in the design by cutting a notch from the radiator to result in ultra wide-band (UWB) antenna. The design is based on Rogers 4003 substrate. A surface equivalence model (SEP) was created for the antenna.  Figure 1(a) presents the design specification from [1] and the resulting FEKO model. Figure 1(b) presents the 3D view of the SEP model.

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

3D view of UWB patch antenna

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 agrees well with the published result.

Fig 2: Reflection coefficient result comparison

Reflection coefficient

Figure 3 shows the antenna with the currents simulated at 3.029 GHz, 4.941 GHz, 6.118 GHz and 10.235 GHz respectively. Note that at lower frequencies, the majority of the currents are concentrated in the vicinity of the notch area .

Fig 3: Distribution of electric currents on the patch antenna

(a) 3.029 GHz
(b) 4.941 GHz
Currents at 3.029 GHz Currents at 4.941 GHz

(c) 6.118 GHz
(d) 10.235 GHz
Currents at 6.118 GHz
Currents at 10.235 GHz




Z. Chen, T.S.P. See, X. Qing, "Small Printed Ultrawideband Antenna with Reduced Ground Plane Effect," IEEE Transactions on Antennas and Propagation, Vol. 55, No. 2, February 2007