A low-weight, compact, tunable phase shifter based on liquid crystal technology is presented. It is designed in a hollow waveguide topology with a dielectric filled cross-section. The operational frequency range is 21-29 GHz, but data up to 35 GHz have been obtained and are presented. The device offers more than 140°phase shift peak per dB insertion loss and 110-130°/dB in the desired range.
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