Compact Microstrip Low-Pass Filter with wide stopband using symmetrical U-shaped resonator

This paper peresents a novel Microstrip Low-Pass Filter (LPF) using a simple symmetrical U-shaped resonator. In this work, a 5.45GHz LPF is developed. The experimental results show that in comparison with other LPFs, it has a wide stopband with high attenuation in the stopband and acceptable sharp frequency response. The insertion-loss is less than 0.1dB and the rejection band over -20dB covers 6.05GHz to 37.35GHz. The measured and simulated results are in good agreement.