Extended hemispherical lens
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The extended hemispherical lens is a commonly used lens for millimeter-wave frequencies. It is typically fabricated from dielectric materials such as Teflon or silicon. The geometry consists of a half sphere of radius R on a cylinder of extension length L, with the same radius.
Scanning performance
When a feed element is placed a distance d off the central axis, then the main beam will be steered an angle γ off-axis. The relation between d and γ can be determined from geometrical optics[1]:
This relation is used when designing focal plane arrays to be used with the extended hemispherical lens.
See also
References
- ^ Frid, Henrik (2016). "Closed-Form Relation Between the Scan Angle and Feed Position for Extended Hemispherical Lenses Based on Ray Tracing". IEEE Antennas and Wireless Propagation Letters.
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