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    Bandstop Filter Using Slow-wave CPW Resonator with Defected Ground Structure
    (ELECTROMAGNETICS ACAD, 2009) Gorur, A.; Karpuz, C.; Akgun, O.
    A novel slow-wave CPW resonator with defected ground structures (DGSs) in rectangular spacing-like shapes is investigated. This structure has an extremely compact size. Simulations and experimental results have verified that the structure provides a size reduction of about 33% against a conventional CPW resonator. Two bandstop filter examples are demonstrated. The bandstop filter realized with a fractional 20-dB bandwidth of 25% at 1.575 GHz includes a slow-wave CPW with DGS loaded periodically by four spiral-shaped resonators.
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    Dual-mode microstrip filters with adjustable transmission zeros
    (INST ENGINEERING TECHNOLOGY-IET, 2008) Eryilmaz, G. M.; Karpuz, C.; Goeruer, A.
    A new type of dual-mode microstrip square-loop resonator that produces asymmetrical frequency responses is proposed. The coupling between degenerate modes of the proposed dual-mode resonator is discussed depending on the perturbation size. The effect of non-orthogonal input/output feed lines located along a straight line on the frequency response is investigated using full-wave electromagnetic simulations. Two second-order bandpass filters using this type of dual-mode microstrip resonator are designed, fabricated and measured to demonstrate the dual-mode microstrip filters exhibiting transmission zero (TZ) shifting property. The one of the second-order filters produces a filter characteristic with two TZs in the upper stopband, whereas the other one has two TZs in the lower and upper stopbands. The shifting property of one of the TZs from one side of the passband to the other side is realised by only changing the perturbation size. The fourth-order filters of this type are also investigated. Both simulated and measured results are presented.