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How does increasing the substrate width affect an antenna’s radiation pattern?

In microstrip and planar antennas, the substrate width is a critical geometric parameter. I want to understand how widening the substrate influences the radiation pattern, including main-lobe width, sidelobe levels, and overall antenna efficiency, and how designers balance physical size with desired electromagnetic performance.

 

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By Mairah Shah Answered 1 year ago


From my experience working with planar and microstrip antennas, I have seen that increasing the substrate width generally broadens the current distribution, which can lead to wider main lobes and slightly higher sidelobe levels. I would recommend considering the trade-off: a wider substrate may improve impedance bandwidth and radiation efficiency but can also introduce undesired pattern distortion, particularly at higher frequencies where surface waves dominate. In practice, careful simulation and prototype measurements are essential, as the effects are highly frequency- and geometry-dependent, and small substrate changes can noticeably alter beam shape and sidelobe behavior.
 
 
 

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