Design and Miniaturization of Dual Band Filter based on Quarter Wavelength Resonators

A dual-band microstrip filter design and size reduction method for C-band application are presented in this research. To produce the desired dual-band response, the concepts and design technique are based on quarter wavelength resonators and three alternative configurations. The use of quarter wavelength resonators allows for a more straightforward filter design. Two simulators—Advanced Keysight Advanced Digital System (ADS) and ANSYS High Frequency Structure Simulator (HFSS) are used for simulations. Taconic RF-35, which has a height of 0.762mm and a dielectric constant of 3.55, is utilized as a substrate material. The filter insertion loss is less than 0.4 dB. The overall size of the filter is reduced by 38% by utilizing the Kotch Fractal curve.