Ku-band multi-functional bandpass filtering isolators (BPFIs) using GaAs coupled-line-based unilateral frequency-selective stages

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dc.contributor.authorLi, Kexin
dc.contributor.authorFontana, Andres
dc.contributor.authorPsychogiou, Dimitra
dc.contributor.funderTaighde Éireann - Research Ireland
dc.date.accessioned2026-07-09T15:00:02Z
dc.date.available2026-07-09T15:00:02Z
dc.date.issued2025-08-08
dc.description.abstractThis paper presents the design and experimental validation of a Ku-band multi-functional RF component integrating the function of a quasi-elliptic bandpass filter and an RF isolator (BPFI). The design is based on cascaded: (i) GaAs MMIC-based unilateral frequency-selective stages (UFSs), comprising a pHEMT transistor-based path and coupled-line feedback, and (ii) passive resonators, whose number and characteristics can be tailored to control the BPFI's selectivity, directivity, and power transmission response. Parametric design studies are conducted to provide insights on UFS characteristic optimization, including gain, bandwidth (BW), noise figure (NF), and input third-order intercept point (IIP3), considering the capabilities of the commercially available 0.15 µm InGaAs process. A coupling routing diagram-based design methodology is also provided, facilitating BPFI design using conventional coupled-resonator synthesis techniques. For experimental validation, a single-stage UFS and a four-stage co-designed BPFI were manufactured and tested using a 0.15 µm GaAs MMIC process. The four-stage BPFI demonstrated a quasi-elliptic transfer function with four poles and three transmission zeros, achieving a passband gain of -1.7 dB, directivity of 30 dB, an NF of 9.2 dB, and an IIP3 of 0.2 dBm at 13 GHz .en
dc.description.sponsorshipResearch Ireland|20/RP/8334 Research Ireland|13/RC/2077_P2
dc.description.versionAccepted Version
dc.format.extent4
dc.format.mimetypeapplication/pdfen
dc.identifier.authororcidLi, Kexin
dc.identifier.authororcidFontana, Andres
dc.identifier.authororcidPsychogiou, Dimitra§0000-0003-1936-4026
dc.identifier.citationLi, K, Fontana, A & Psychogiou, D 2025, Ku-band multi-functional bandpass filtering isolators (BPFIs) using GaAs coupled-line-based unilateral frequency-selective stages. in 2025 IEEE/MTT-S International Microwave Symposium - IMS 2025. Institute of Electrical and Electronics Engineers Inc., pp. 950-953, 2025 IEEE/MTT-S International Microwave Symposium, IMS 2025, San Francisco, United States, 15/06/25. https://doi.org/10.1109/IMS40360.2025.11103928
dc.identifier.doi10.1109/IMS40360.2025.11103928
dc.identifier.endpage953
dc.identifier.isbn979-8-3315-1410-5
dc.identifier.isbn979-8-3315-1409-9
dc.identifier.otherORCID: /0000-0003-1936-4026/work/220227241
dc.identifier.startpage950
dc.identifier.urihttps://hdl.handle.net/10468/19044
dc.language.isoen
dc.publisherInstitute of Electrical and Electronics Engineers Inc.
dc.relation.urihttps://www.scopus.com/pages/publications/105014239076
dc.rights© 2024, IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
dc.rights.accessrightsopen access
dc.rights.uriunspecified
dc.statusPeer reviewed
dc.subjectBandpass filter (bpf)
dc.subjectCoupled-line filter
dc.subjectIsolator
dc.subjectMonolithic microwave integrated circuit (MMIC)
dc.subjectUnilateral filter
dc.subject[EngineeringArchitecture]
dc.subject[Tyndall]
dc.titleKu-band multi-functional bandpass filtering isolators (BPFIs) using GaAs coupled-line-based unilateral frequency-selective stagesen
dc.typeConference item
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