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The hemispherical (or half-Luneburg) lens antenna is a candidate type for satellite communications-on-the-move, either singly or as an element in a small array. It offers good aperture efficiency in a reduced height and excellent scanning performance. This work describes the development of half Luneburg lens antennas together with feeding arrangements to provide highly directive antennas with good...
Absolute phase noise < −100 dBc/Hz at 1 Hz offset from a 10 GHz carrier is demonstrated by using an Er:fiber frequency comb to frequency-divide a narrow linewidth CW laser.
We report results for improving the stability and uncertainty of the NIST 171Yb lattice clock. The stability improvements derive from a significant reduction of the optical Dick effect, while the uncertainty improvements focus on improved understanding and constraint of the cold collision shift.
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