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Two dual-band branch line couplers with arbitrary power division are proposed in this brief. By adopting half-wavelength open/short-ended stubs in improved couplers, the dual-band operations could effectively be implemented while ensuring a compact size. Furthermore, the frequency is tunable by changing the characteristic impedance of the transmission line. For practical verification, two branch line coupler (εr = 2.65, h = 0.5 mm) operating at 0.9/1.8GHz and 0.9/1.57GHz are constructed in microstrip technology and tested. The measured results are in good agreement with the simulated ones.
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Feng et al. (2020) studied this question.
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