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    ASYMMETRIC DUAL-MODE MICROSTRIP SQUARE LOOP RESONATORS AND FILTERS
    (IEEE, 2008) Karpuz, Ceyhun; Goeruer, Adnan; Eryilmaz, G. Murat
    [Abstract Not Available]
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    Compact dual-band bandpass filters using dual-mode resonators
    (IEEE, 2007) Goeruer, Adnan; Karpuz, Ceyhun
    To reduce the size of microstrip dual-band bandpass filters (DBBPFs) by keeping excellent performance, a novel DBBPF configuration is proposed. The novel DBBPFs include two dual-mode resonators based on square loop structure that are located one within the other to remove extra circuit area. The square open-loop stubs connected at the end of feed tines are employed to suppress harmonics. The two DBBPFs with real axis and imaginary aids transmission zeros are designed, fabricated and measured.
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    Compact Dual-Mode Microstrip Quasi-Meander Loop Resonator for Filter Applications
    (IEEE, 2008) Karpuz, Ceyhun; Eryilmaz, G. Murat; Goeruer, Adnan
    A compact microstrip dual-mode resonator is proposed for asymmetric response filter applications. The proposed microstrip dual-mode resonator that has form of a quasi-meander shaped loop resonator is investigated using a full-wave electromagnetic simulator. It is found that the degenerate modes, i.e., the odd and even modes, within this dual-mode resonator exhibit behavior similar to that of conventional dual-mode loop resonator. It is shown that there are two transmission zeros. The one of them is inherently associated with the dual-mode resonator structure and the other one is inherently associated with the odd mode. Two asymmetrical response filters exhibiting two transmission zeros in the upper stopband, and two transmission zeros in the lower and upper stopbands are realized utilizing dual-mode quasi-meander loop resonator.