Abstract
A tunable dual-band quadrature hybrid coupler for mobile GSM bands (900 and 1800 MHz) is proposed and characterized. The structure is composed of four quarter-wavelength sections at a frequency located between the two operating frequencies and two pairs of open-ended stubs. Frequency tuning is achieved by modifying the electrical length of the open-ended stubs with varactor-diode capacitors. A dual-band tunability of 33% and 10% is obtained for the first and the second bands, respectively. © 2006 IEEE.
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Djoumessi, E. E., Marsan, E., Caloz, C., Chaker, M., & Wu, K. (2006). Varactor-tuned dual-band quadrature hybrid coupler. IEEE Microwave and Wireless Components Letters, 16(11), 603–605. https://doi.org/10.1109/LMWC.2006.884905
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