Hybrid surface‐acoustic‐wave/microstrip signal‐interference bandpass filters. Issue 4 (1st March 2016)

• Record Type: Journal Article
• Authors: Gómez‐García, Roberto; Psychogiou, Dimitra; Loeches‐Sánchez, Raúl; Peroulis, Dimitrios
• Is Part Of: IET microwaves, antennas & propagation. Volume 10:Issue 4(2016)
• Page Start: 426
• Page End: 434
• Publication Date: 2016-03-01
• Subjects: band‐pass filters -- microstrip filters -- surface acoustic wave resonator filters -- transversal filters; multiTFS‐series‐cascade‐based high‐order BPF prototype characterisation -- microstrip technology fabrication -- prototype assembly process -- prototype fabrication process -- all‐acoustic‐ wave BPF configuration -- wide‐band specification -- narrow‐to‐moderate specification -- occupied circuit size -- filtering selectivity -- small‐fractional‐bandwidth FBW applications -- bi‐path circuit topologies -- in‐band SAW BPF -- embedded one‐port SAW resonator -- transversal filtering section -- hybridised SAW BPF -- hybridised microstrip BPF -- RF design technique -- radio‐frequency design technique -- hybrid microstrip signal‐interference bandpass filter -- hybrid surface‐acoustic‐wave signal‐interference bandpass filter; Microwaves -- Periodicals; Microwave antennas -- Periodicals; Antennas (Electronics) -- Periodicals; Radio wave propagation -- Periodicals; Microwave communication systems -- Periodicals; 621.381305
• DOI: 10.1049/iet-map.2015.0346
• Languages: English
• ISSNs: 1751-8725

Abstract

Abstract : Radio‐frequency (RF) design techniques for the development of signal‐interference microwave bandpass filters (BPFs) with hybridised microstrip and surface‐acoustic‐wave (SAW) elements are reported. They make use of two original types of transversal filtering sections (TFSs) with embedded one‐port SAW resonators. The SAW resonators operate either as non‐resonating nodes or as an in‐band SAW BPF in their bi‐path circuit topologies. These new TFS approaches extend the suitability of signal‐interference BPFs to small‐fractional‐bandwidth (FBW) applications, while offering significant advantages in terms of filtering selectivity and occupied circuit size when compared to traditional solutions for narrow‐to‐moderate/wide‐band specifications. Broader FBWs than those attainable through most of the available all‐acoustic‐wave BPF configurations are also feasible with them. Moreover, a single type of SAW device is employed in the entire BPF structure, which results in a practical benefit regarding robustness to deviations in the prototype fabrication and assembly processes. The proposed filter design concepts are experimentally verified through the fabrication in microstrip technology and characterisation of two multi‐TFS‐series‐cascade‐based high‐order BPF prototypes with very‐narrow and moderate FBWs.