A 4-bit p-i-n diode switched-line phase shifter was fabricated for use in the 2.0- to 4.0-GHZ frequency range. Extremely good phase characteristics were easily obtained over two octaves by employing a resistive loading technique to eliminate resonance problems. A single bit was modeled and analyzed on a computer from 1.5 to 6.0 GHz. Test results of a microstrip realization of this bit, which correlates well with the computer model, are presented. A unique compatible driver used with the phase shifter, and the microstrip fabrication process used in constructing the phase shifter are also presented.
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Lynes et al. (1974) studied this question.
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