UWB FILTERING USING HEXAGONAL HONEYCOMB SHAPED RESONATOR

Abstract

Ultra-wideband (UWB) technology is a modern wireless communication system that uses a large amount of bandwidth. Due to its various advantages, such as high-speed data transfer, precise location detection, and secured communication, it has numerous applications in communication systems, medical imaging, automobile and radar systems etc. According to the Federal Communications Commission (FCC), in 2002, the unlicensed allowed frequency for UWB indoor and handheld applications is restricted within 3.1 GHz to 10.6 GHz. Hence, research is carried out to develop UWB filters, which are an important component of a UWB communication system to limit the frequency and reduce interference from other signals. This paper introduces a new UWB filter that uses a hexagonal honeycomb-shaped resonator. The hexagonal design not only saves space but also improves how the filter performs compared to traditional designs. Also, interdigital parallel coupled microstrip lines (PCML) are used to excite the resonator and to achieve the bandpass behaviour. We carefully designed the resonator’s dimensions to achieve good performance, resulting in low insertion loss (IL) and a wide operational bandwidth. The passband of the designed filter spans from 3.14 GHz to 10.56 GHz with a fractional bandwidth of 108.32% and minimal signal loss. The filter is designed on a low-cost FR4 substrate with a dielectric constant of 4.4 and a thickness of 1.6 mm. The simulation of the filter is done using ANSYS High Frequency Structure Simulator (HFSS). Due to its compact and cost-effective design, this filter can be used in applications like communication systems and radar systems.