Design and optimization of a compact microstrip BPF for wireless communication systems based on open-loop rectangular resonators

In modern wireless communication systems, the demand for compact, efficient, and reliable components has increased significantly with the growth of technologies such as Wi-Fi, WiMAX, 5G, and IoT devices. Among these, Bandpass Filters (BPFs) play a crucial role by selectively allowing desired frequency bands to pass while effectively suppressing unwanted signals. Their ability to ensure accurate signal transmission, combined with affordability, ease of fabrication, and compatibility with integrated circuits, makes microstrip-based Bandpass Filters highly attractive for practical applications, including medical electronics and next-generation wireless communication systems. This project focuses on designing a compact Bandpass Filter using open-loop rectangular resonators to achieve low insertion loss and high return loss. The proposed structure enhances overall filter performance by minimizing signal power loss during transmission while improving impedance matching and reducing signal reflection. Such characteristics are critical in maintaining efficient system performance without compromising compactness. The use of rectangular resonators ensures a simple design, reduced size, and cost-effective implementation. The filter design is carried out using the HFSS Simulator, which enables precise electromagnetic modeling and supports a wide range of applications. This study highlights the potential of the proposed filter for future wireless communication technologies.

Keywords: Bandpass Filter (BPF), Microstrip, Open-loop Resonators, Insertion Loss, Return Loss, HFSS, Wireless Communication, 5G, IoT.