This report reviews spherical harmonic expansions to compute wideband antenna patterns. Some antenna patterns, such as the far-field of a ship, require lots of computer time per each frequency. Consequently, computing such a pattern across a wide frequency band at each frequency is prohibitive. Spherical harmonics offer an alternative-compute the pattern over a coarse sampling across the frequency band, interpolate the spherical harmonics, and use these harmonics to recover the ...
An ultra low power 180-degree, 1-bit phase shifter has been designed using Agilent's Advanced Design Software (ADS) co-simulation. Silicon-on-Insulator (SOI). MOSFETs were used as the switching elements because of their low current draw and low capacitance. A 1-bit 0, 180-degree phase shift has been realized with only two MOSFETs, simplifying manufacture and decreasing power.
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