Varactor-Tuned Dual-Band Quadrature Hybrid Coupler |
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| Authors: | Djoumessi E.E. Marsan E. Caloz C. Chaker M. Wu K. |
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| Affiliation: | Poly-Grames Res. Center, Ecole Polytech. de Montreal, Que.; |
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| Abstract: | A tunable dual-band quadrature hybrid coupler for mobile GSM bands (900 and 1800MHz) 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 |
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