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Varactor-Tuned Dual-Band Quadrature Hybrid Coupler

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5 Author(s)
Djoumessi, E.E. ; Poly-Grames Res. Center, Ecole Polytech. de Montreal, Que. ; Marsan, E. ; Caloz, C. ; Chaker, M.
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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

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:16 ,  Issue: 11 )