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    A Novel Compact Quad-Band Microstrip Bandstop Filter Design Using Open-Circuited Stubs
    (IEEE, 2013) Karpuz, Ceyhun; Gorur, Adnan; Gorur, Ali Kursad; Ozek, Ahmet
    A novel compact quad-band microstrip bandstop filter design is presented. Input and output ports of the filter are connected with a high impedance transmission line. Proposed filter is designed by using open-circuited stubs attached to the input and output ports. Thus, based on the f(r) - 3f(r) harmonic property of the stub-loaded resonators, four stopbands at 1.15-2.22, 2.94-4.56, 4.95-6.98 and 8.26-8.96 GHz are obtained. Insertion losses of all stopbands are better than 15 dB inside the stopbands. Under the even and odd mode excitations, resonance conditions of the structure are also investigated. For the experimental verification of the simulated results, proposed filter has been fabricated. Simulated and measured results are in a good agreement.
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    Design of Quad-Band Bandpass Filter Using Nested Dual-Mode Square Loop Resonators
    (IEEE, 2014) Karpuz, Ceyhun; Gorur, Ali Kursad; Ozek, Ahmet; Karaca, Zuhra
    In this letter, design of a quad-band microstrip bandpass filter is presented by using nested placed four dual-mode square loop resonators (DMSLR) having different electrical lengths. Arms of the square loop resonators (SLR) are formed with low/high impedance parts, in order to obtain a maximum miniaturization by nesting DMSLRs and perturbation effects by changing the lengths of low impedance parts for the excitation of degenerate modes. Thus, the proposed configuration allows the control of mode frequencies, bandwidths and transmission zeros for each passband individually. Resonators are coupled to input/output (I/O) ports by feedlines having open-circuited stubs which suppress the harmonics. A dual-mode quad-band bandpass filter has been designed with an electrical length of 0.25 lambda(g) x 0.25 lambda(g) and fabricated, where lambda(g) is the guided wavelength at 1.79 GHz (the lowest resonance frequency). Measured and simulated results are in a good agreement.