Wireless Network Antenna Card


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Wireless Network Antenna Card


Contents


Introduction

Abstract:An antenna card used for connecting a laptop PC to a wireless network is designed using FDTD simulation technology in EMPro. Includes measured and simulated results.This example demonstrates the use of FDTD technology in EMPro for the design of a wireless network card antenna. The ultra-fast simulation capability of EMPro enables designers to quickly test and verify different antenna configurations and sizes. EMPro’s powerfull visualization features also enable designers to analyze the current and field patterns on the antenna surface which aids the design of smaller antennas.

Design Challenges

Some laptop PCs use external wireless networking cards for connecting to a cellular network. Since the antenna performance is critical to the overall system performance, the antenna must be properly designed, while size is minimized.


Figure 1: Typical network card antenna configuration

One design issue is that the size of the ground plane affects the resonance frequency of antenna, so antenna designers must analyze the antenna with ground planes attached as shown in Figure 2.


Figure 2: EM simulations showing effect of ground plane size on resonant frequency

Another issue to consider is whether the presence of localizer will change the antenna’s resonance frequency and the current distribution. Figure 3 shows little effect of a localizer in this case.


Figure 3: Simulation results with and without a localizer

Results

The figures below show results from FDTD simulations in EMPro.


Figure 4: Far field patterns at two frequencies


Figure 5: Current and field plots


Figure 6: Comparison of different antenna heights


Figure 7: Simulated and measured return loss results

Conclusion

With EMPro, the design of a wireless network card antenna is simple and quick. The ultra fast simulation capability of EMPro enables you to quickly test and verify different antenna configurations and sizes.

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