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Ultra-wideband tunable resonator based on varactor-loaded complementary split- ring resonators on a substrate-integrated waveguide for microwave sensor applications [Letters]

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2 Author(s)
Somarith Sam ; Sch. of Electr. & Electron. Eng., Chung-Ang Univ., Seoul, South Korea ; Sungjoon Lim

This paper presents the modeling, design, fabrication, and measurement of an ultra-wideband tunable two-port resonator in which the substrate-integrated waveguide, complementary split-ring resonators (CSRRs), and varactors are embedded on the same planar platform. The tuning of the passband frequency is generated by a simple single dc voltage of 0 to 36 V, which is applied to each varactor on the CSRRs. Different capacitance values and resonant frequencies are produced while a nearly constant absolute bandwidth is maintained. The resonant frequency is varied between 0.83 and 1.58 GHz and has a wide tuning ratio of 90%.

Published in:

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control  (Volume:60 ,  Issue: 4 )