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Symmetrical Spiral Inductor-Coupled Bandpass Filter with a Stepped-Down Metal Width
Maharjan, R. K.,Kim, N. Y. KING FAHD UNIVERSITY OF PETROLEUM MINERALS 2014 Arabian journal for science and engineering: AJSE Vol.39 No.3
A compact microstrip symmetrical rectangular spiral inductor-coupled bandpass filter using a variable stepped-down metal width is presented. The proposed filter is based on an electromagnetic coupling between two symmetrical spiral turns with variable metal widths and spacing. The asymmetrical port terminals are coupled to the main inductor-resonators as a new coupling scheme using two narrow tuning stubs. The coupling scheme of the ports with the stubs maintains the 50 Omega impedance matching with input and output devices. The two symmetrical spiral inductors in the design structure are precisely mounted and adjusted together with equal spacing and gaps, so that the combined configuration behaves as a single resonator as inductor-interdigital coupling. The structure of combining two such resonators enables strong inductive coupling and effective capacitive coupling between the two ports and generates a resonant frequency of 5.597 GHz. The measured insertion loss (S (21)) was -0.93 dB, and the measured return loss (S (11)) was -24.4 dB.
Microstrip Bandpass Filters Using Window Hairpin Resonator and T-Feeder Coupling Lines
Maharjan, R. K.,Kim, N. Y. KING FAHD UNIVERSITY OF PETROLEUM MINERALS 2014 Arabian journal for science and engineering: AJSE Vol.39 No.5
A new structure of planar window hairpin-based bandpass filters with symmetrical T-shaped feeder coupling line resonators is introduced. With varying different width in X axis and length in Y axis of the window of the hairpin resonator configuration, correspondingly the changes can be observed in the resonant frequency and useable bandwidth. By these methods, frequency tuning can be easily achieved by adjusting hairpin window dimension of the structure. Both filters were designed for 5.205 GHz resonant frequency. The geometrical window hairpin structure areas of both type filters are quite similar and both filters are resonated at almost the same frequency. The measurement results show that return loss (S-11) for both filters is higher than 23.0 dB and insertion loss (S-21) is measured less than -1.4 dB at resonant frequency of 5.13 GHz. The S-parameter responses of the fabricated filter nearly match with the electromagnetic simulated results; therefore, the feasibility of practical application of the proposed filters can be expected.