Self‐packaged MISL‐based miniaturized high Q factor bandpass filter

• Published in: Electronics letters Vol. 60; no. 3
• Main Authors: Ma, Kaixue, Lin, Songhua, Wu, Yi
• Format: Journal Article
• Language: English
• Published: Wiley 01.02.2024
• Subjects: band‐pass filters; passive filters
• ISSN: 0013-5194; 1350-911X
• DOI: 10.1049/ell2.13104

This paper proposes a technique named self‐packaged metal integrated suspended line (MISL) to design a high Q factor bandpass filter (BPF). This unique construction simplifies the traditional suspended stripline and substrate integrated suspended line configuration and creates a loss‐reduced structure, allowing for the implementation of high Q‐factor circuits. To demonstrate the advantages of the MISL platform, the shorted 3D metal stepped impedance resonators are first investigated using a miniaturized prototype based on this novel platform. Subsequently, a third‐order BPF based on MISL technology is designed, fabricated, and characterized. The fabricated BPF exhibits a minimum insertion loss (IL) of 0.31 dB, with centre frequencies of 5.88 GHz and 3‐dB fractional bandwidths of 19.8%, respectively. This paper proposes a technique named self‐packaged metal integrated suspended line to design a high Q factor bandpass filter with low loss and a compact size.