Compact Microstrip Bandpass Filter using Stepped-Impedance Resonators and Stepped-Lumped Resonators for 5G Wi-Fi and WLAN Applications

This article presents a novel and compact microstrip bandpass with enhanced upper stopband characteristics to fulfil the requirements of the WLAN/5G Wi-Fi. The proposed bandpass filter (BPF) uses the stepped-impedance resonators and the stub-loaded resonators to achieve the desired BPF response for 5G Wi-Fi and WLAN applications. The rectangular slots on both sides of the microstrip are used to improve the stopband performance and eliminates the spurious response. The designed BPF covers the frequency band of sub-band 6 GHz that is useful for released FCC’s band for WLAN/ 5G Wi-Fi and the free use of the microwave spectrum in the range of 5150-5250 MHz band, 5250-5350 MHz, 5470-5725 MHz, and 5725-5875 MHz permitted by the Indian government. The proposed BPF is designed on an RT/Duroid 5880 Substrate with the thickness of 0.508 mm and surface area of 31×27 mm
²
.