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What are the advantages of using cavity-backed antenna structures?

I am exploring different antenna architectures, and cavity-backed designs frequently appear in literature, especially for high-gain and broadband applications.
I want to clarify what practical advantages cavities offer in terms of efficiency, bandwidth, and radiation control.

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By Chirag Answered 1 year ago

From my experience, cavity-backed antennas offer several clear benefits. I have seen them provide enhanced radiation efficiency because the cavity reflects energy that would otherwise be lost, and broader bandwidth due to reduced Q-factor compared to open patch designs. I would also point out their ability to control sidelobe levels and shape the main beam, which is valuable in radar and satellite applications. In practice, cavities also reduce surface-wave coupling and spurious radiation, making them ideal for high-performance or high-frequency applications, though at the cost of slightly increased weight and fabrication complexity.

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