Application Note

Microstrip Patch Array Design

Source: CST of America, Inc.
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For optimal performance of an antenna array, the spatial distribution of the elements as well as phases and magnitudes at each element need to be tuned. The design of the individual patch element, the arrangement and spacing of the array and the layout of the feed network are all factors that decide both the radiation pattern and S-parameters of an array.

In this application-based article on printed arrays in wireless local area networks (WLAN), CST shows that by separating the design process into specific steps, optimizing is made less challenging.

The design process for a planar microstrip patch array for WLAN frequencies is simplified with the help of the circuit and full-wave 3D solvers and optimization tools in CST STUDIO SUITE®. This article shows how CST software can help to design an array with high directivity, low cost and low sidelobes. This particular example showcased good impedance matching in the frequency range 5.18 – 5.85 GHz. 

The approach described in this article can also be used to design other types of array through the use of a different radiator or array layout.