Achmad Munir, Edwar, Junas Haidi, Sulistyaningsih, Rheyuniarto Sahlendar Asthan, Agustinus Agung Nugroho
In this work, a circular waveguide structure is implemented to realize a compact narrowband bandpass filter (BPF) by incorporating magneto-dielectric (MD) material. The proposed circular waveguide filter is intended to produce the bandpass response with high selectivity. The structure of circular waveguide is designed to work in the TE11 resonance mode with the diameter of 18.8 mm and the length of 105 mm. Meanwhile, the incorporated MD material is a Yttrium Iron Garnet (YIG) which takes a circular shape with the diameter of 18 mm and the thickness of 4.7 mm. To achieve a narrowband response, two dielectric materials made of Arlon AD250A with the same diameter and thickness are also incorporated in the circular waveguide with the position flanking the MD material. It should be noted that the distance between the dielectric materials and the MD material plays an important role in gaining a critical coupling, thereby yielding a high selectivity filter. Based on the parametric study, the distance between the dielectric materials and the MD material which produces a desirable bandpass response is set to be 5 mm. In such configuration, a narrowband response with high selectivity can be achieved. It shows that the realized narrowband circular waveguide BPF incorporating MD material has the center frequency of 9.05 GHz with the -3 dB working bandwidth of 170 MHz within the frequency of 8.98 GHz to 9.15 GHz, or its fractional bandwidth of 1.87%. © 2025 IEEE.
School of Electrical Engineering and Informatics, Institut Teknologi Bandung, Radio Telecommunication and Microwave Laboratory, Indonesia; School of Electrical Engineering, Telkom University, Indonesia; College of Engineering, United Arab Emirates University, Department of Electrical and Communication, United Arab Emirates; University of Bengkulu, Department of Electrical Engineering, Indonesia; Research Center for Telecommunication, Brin, Indonesia; Institut Teknologi Sumatera, Department of Electrical Engineering, Indonesia; Institut Teknologi Bandung, Faculty of Mathematics and Natural Science, Department of Physics, Indonesia
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