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In this paper, a vector sum phase shifter system has been implemented using a novel RF variable directional coupler. The variable coupler uses micro-fluidics to vary the coupling between the through and coupled ports of a single-section broadside coupled quarter-wave stripline coupler. An in-phase combiner is then used to recombine the through and coupled signals to achieve a variable linear phase...
This paper details a novel variable directional coupler based on a broadside coupled stripline structure employing microfluidics. The coupler has shown good bandwidth of 7.5-12.5 GHz with only a single quarter wavelength section. The variable coupling has been achieved by creating chambers in the dielectric material between the two coupled strips. The chambers have the same length and width as the...
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