A broadband dumb-bell-shaped 45° phase shifter is presented using a new design comprised of open-circuit and short-circuit multi-section stubs. A wideband phase shifter operating over the frequency range 2–6 GHz was designed and fabricated for verification purposes. It was measured to have a bandwidth of about 100% for a maximum phase deviation of ±3.2°, and maximum insertion loss of 2.1 dB.
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Zheng et al. (2008) studied this question.
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