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2 years ago in Antenna & RF Design , Engineering By Krithi
What is the Rayleigh resolution criterion for single-aperture antennas, and how is it applied?
Single-aperture antennas have a finite beamwidth, limiting their ability to resolve closely spaced sources. I want to understand the Rayleigh criterion in this context—how it quantifies resolution, the role of aperture size and wavelength, and its practical significance for radar, radio astronomy, or communication systems.
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By Tina Answered 1 year ago
From my experience analyzing single-aperture antennas, I have seen that the Rayleigh resolution criterion defines the smallest angular separation at which two sources can be distinguished. It is typically expressed as θR≈1.22λ/Dtheta_R approx 1.22 lambda / DθR?≈1.22λ/D, where λlambdaλ is the wavelength and DDD is the aperture diameter. I would recommend using this as a guideline for design, since smaller apertures or longer wavelengths produce wider beams, reducing resolution. In practice, this criterion helps determine whether an antenna can distinguish closely spaced signals in radar, satellite, or radio astronomy applications. While it provides a diffraction-limited benchmark, real-world factors like side lobes, aperture illumination, and measurement noise can further affect the effective resolution, so simulation and experimental validation are essential.   Â
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