Advancements and Challenges in Microstrip Dual-Band Bandpass Filters: A Comprehensive Survey

Abstract

The growing demand for multi-frequency wireless communication systems has significantly increased research interest in multi-band radio frequency (RF) and microwave filters. Designing multi-band RF and microwave filters that are efficient, affordable, compact, lightweight, and easy to fabricate presents a significant challenge. Multi-band bandpass filters (BPFs), including dual-, tri-, and quad-band variants, are pivotal in simplifying RF systems by reducing component count, particularly in multi-band transceivers. Creating compact and efficient dual-band filters is essential for modern electronic devices operating in dual frequency bands. This article presents a thorough analysis of prior research on microstrip dual-band bandpass filter designs, emphasizing current developments and the challenges encountered. A detailed comparison of several design strategies is provided and discussed to offer researchers insights into the benefits and drawbacks of each technique for specific applications. This article also outlines the challenges and future research directions for dual-band microstrip BPFs to meet various performance goals in current and future wireless systems.