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8x16 Patch Array Antenna


Contents


Introduction

Abstract:An 8x16 Patch Array Antenna was designed and simulated using the FDTD Simulator in EMPro.Depending on the number of array elements and the complexity of the feeder network, the simulation of a patch array antenna can be quite challenging. Although simulation time and speed are mostly related to the problem size, another effect on simulation time is the frequency bandwidth. In this example, an 8x16 Patch Array antenna (35.2 cm x 27 cm) is simulated with the FDTD EM engine.

Figure 1 shows the complete EMPro drawing of 8x16 patch array antenna.


Figure 1: 8x16 Patch Array

Design Challenges

Multiple antennas can be arranged in such a way as to add constructively (or cancel destructively) the fields from individual elements so that they produce highly directive radiation patterns. Therefore, the main lobe of an antenna can be steered by changing the phase of excitations at each array element. The patch array antenna is a typical type of array antenna. A large array of elements may result in a very large simulation problem. In addition to the physical size, the simulation time may also be increased if a broadband simulation is required. In many cases, FDTD EM simualation technology is the preferable choice since it produces a wide band simulation result with a single simulation (no frequency sweeping is necessary) and uses less memory while speeding up the simulation utilizing GPU acceleration.

Results

Figure 2 shows S11 results of the 8x16 patch array antenna.


Figure 2: S11 Result of 8x16 Patch Array

Figure 3 shows the radiation field pattern of the 8x16 patch array antenna.


Figure 3: Radiation Pattern of 8x16 Patch Array

Figure 4 shows the theta cut radiation field pattern of 8x16 patch array antenna.


Figure 4: Theta Cut Radiation Pattern of 8x16 Patch Array

Conclusion

Complex patch array antennas can be quickly and efficiently simulated with EMPro FDTD engine as demonstrated in this example. The size of FDTD problem with this project was about 1GB. With GPU acceleration, the simulation time took less than 1 hour.

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