3387af475558d8f19d12ae66973c4dac sensors_a2020v20n21p6236.pdf c94dd5b688ca5a8d1d9ef2fc697136c88259eafa sensors_a2020v20n21p6236.pdf 4b4df5715a27beff835abae3cf0a4356b9751fc1cb52abceaa3525fe2e41cc9e sensors_a2020v20n21p6236.pdf Title: Highly Sensitive Reflective-Mode Defect Detectors and Dielectric Constant Sensors Based on Open-Ended Stepped-Impedance Transmission Lines Subject: In this paper, reflective-mode phase-variation sensors based on open-ended stepped-impedance transmission lines with optimized sensitivity for their use as defect detectors and dielectric constant sensors are reported. The sensitive part of the sensors consists of either a 90 high-impedance or a 180 low-impedance open-ended sensing line. To optimize the sensitivity, such a sensing line is cascaded to a 90 transmission line section with either low or high characteristic impedance, resulting in a stepped-impedance transmission line configuration. For validation purposes, two different sensors are designed and fabricated. One of the sensors is implemented by means of a 90 high impedance (85 ) open-ended sensing line cascaded to a 90 low impedance (15 ) transmission line section. The other sensor consists of a 180 15- open-ended sensing line cascaded to a 90 85- line. Sensitivity optimization for the measurement of dielectric constants in the vicinity of that corresponding to the Rogers RO4003C substrate (i.e., with dielectric constant 3.55) is carried out. The functionality as a defect detector is demonstrated by measuring the phase-variation in samples consisting of the uncoated Rogers RO4003C substrate (the reference sample) with arrays of holes of different densities. Keywords: microwave sensors; stepped-impedance transmission lines; dielectric constant sensor; phase-variation sensors Author: Pau Casacuberta, Jonathan Muñoz-Enano, Paris Vélez, Lijuan Su, Marta Gil and Ferran Martín Creator: LaTeX with hyperref package Producer: pdfTeX-1.40.18 CreationDate: Mon Nov 2 10:38:47 2020 CET ModDate: Mon Nov 2 11:15:02 2020 CET Custom Metadata: no Metadata Stream: no Tagged: no UserProperties: no Suspects: no Form: none JavaScript: no Pages: 11 Encrypted: no Page size: 595.276 x 841.89 pts (A4) Page rot: 0 File size: 2194795 bytes Optimized: no PDF version: 1.7 name type encoding emb sub uni object ID ------------------------------------ ----------------- ---------------- --- --- --- --------- YSPQJI+VnURWPalladioL-Bold Type 1 Custom yes yes no 10 0 CIQLLF+VnURWPalladioL Type 1 Custom yes yes no 15 0 NELNYK+URWPalladioL-Ital Type 1 Custom yes yes no 19 0 IEYFNV+URWPalladioL-Bold Type 1 Custom yes yes no 24 0 HAITYR+URWPalladioL-Roma Type 1 Custom yes yes no 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PDFMetadata: Objects: 527 FreeObjects: 1 IncrementalUpdates: 0 DocumentCatalog: PageLayout: SinglePage PageMode: UseNone Outlines: Item: Title: Introduction Destination: section.1 Item: Title: Sensor Design and Fabrication Destination: section.2 Item: Title: Results Destination: section.3 Item: Title: Conclusions Destination: section.4 Item: Title: References Destination: section.4 Info: Title: Highly Sensitive Reflective-Mode Defect Detectors and Dielectric Constant Sensors Based on Open-Ended Stepped-Impedance Transmission Lines Author: Pau Casacuberta, Jonathan Muñoz-Enano, Paris Vélez, Lijuan Su, Marta Gil and Ferran Martín Subject: In this paper, reflective-mode phase-variation sensors based on open-ended stepped-impedance transmission lines with optimized sensitivity for their use as defect detectors and dielectric constant sensors are reported. The sensitive part of the sensors consists of either a 90 high-impedance or a 180 low-impedance open-ended sensing line. To optimize the sensitivity, such a sensing line is cascaded to a 90 transmission line section with either low or high characteristic impedance, resulting in a stepped-impedance transmission line configuration. For validation purposes, two different sensors are designed and fabricated. One of the sensors is implemented by means of a 90 high impedance (85 ) open-ended sensing line cascaded to a 90 low impedance (15 ) transmission line section. The other sensor consists of a 180 15- open-ended sensing line cascaded to a 90 85- line. Sensitivity optimization for the measurement of dielectric constants in the vicinity of that corresponding to the Rogers RO4003C substrate (i.e., with dielectric constant 3.55) is carried out. The functionality as a defect detector is demonstrated by measuring the phase-variation in samples consisting of the uncoated Rogers RO4003C substrate (the reference sample) with arrays of holes of different densities. 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