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2 years ago in Electrical Engineering By Govind
I’m designing a compact device with two co-located UWB antennas and need to maximize isolation. What is the optimal element spacing, and are there layout strategies beyond pure separation to reduce coupling?
I'm an RF systems engineer integrating a dual-antenna UWB module for ranging and comms. My board space is extremely limited. While I know λ/2 spacing is a classic starting point, UWB's wide bandwidth (3.1-10.6 GHz) makes that rule problematic. I need data-driven advice: at what center-to-center distance does mutual coupling typically fall below, say, -15 dB across the entire band? More importantly, what proven layout techniques—ground plane shaping, neutralization lines, metamaterial isolators—can allow me to reduce that required spacing further without sacrificing bandwidth or efficiency?
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By Roma Answered 1 year ago
From my prototyping experience, relying on spacing alone is insufficient for UWB. A pure λ/2 rule at the highest frequency (≈15mm at 10.6 GHz) often leaves unacceptable coupling at lower bands. I've achieved
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