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Keywords = photo conductive antenna

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16 pages, 1911 KiB  
Article
A Novel System for Quasi-Continuous THz Signal Transmission and Reception
by Andrej Sarjaš, Blaž Pongrac and Dušan Gleich
Sensors 2022, 22(12), 4448; https://doi.org/10.3390/s22124448 - 12 Jun 2022
Viewed by 1840
Abstract
This paper presents a novel system for generating and receiving quasi-continuous (QC) TeraHertz (THz) waves. A system design and theoretical foundation for QC-THz signal generation are presented. The proposed QC-THz system consists of commercially available photo-conductive antennas used for transmission and reception of [...] Read more.
This paper presents a novel system for generating and receiving quasi-continuous (QC) TeraHertz (THz) waves. A system design and theoretical foundation for QC-THz signal generation are presented. The proposed QC-THz system consists of commercially available photo-conductive antennas used for transmission and reception of THz waves and a custom-designed QC optical signal generator, which is based on a fast optical frequency sweep of a single telecom distributed-feedback laser diode and unbalanced optical fiber Michelson interferometer used for a high-frequency modulation. The theoretical model for the proposed system is presented and experimentally evaluated. The experimental results were compared to the state-of-the-art continuous-wave THz system. The comparison between the continuous-wave THz system and the proposed QC-THz system showed the ability to transmit and receive QC-THz waves up to 300 GHz. The upper-frequency limit is bounded by the length of the used Michelson interferometer. The presented design of THz signal generation has a potential for industrial application because it is cost-efficient and can be built using commercially available components. Full article
(This article belongs to the Special Issue Terahertz Emitters and Detectors)
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14 pages, 8401 KiB  
Article
Real-Time High Resolution THz Imaging with a Fiber-Coupled Photo Conductive Antenna and an Uncooled Microbolometer Camera
by Peter Zolliker, Mostafa Shalaby, Elisa Söllinger, Elena Mavrona and Erwin Hack
Sensors 2021, 21(11), 3757; https://doi.org/10.3390/s21113757 - 28 May 2021
Cited by 11 | Viewed by 5438
Abstract
We present a real-time THz imaging method using a commercial fiber-coupled photo conductive antenna as the THz source and an uncooled microbolometer camera for detection. This new combination of state-of-the-art components is very adaptable due to its compact and uncooled radiation source, whose [...] Read more.
We present a real-time THz imaging method using a commercial fiber-coupled photo conductive antenna as the THz source and an uncooled microbolometer camera for detection. This new combination of state-of-the-art components is very adaptable due to its compact and uncooled radiation source, whose fiber coupling allows for a flexible placement. Using a camera with high sensitivity renders real-time imaging possible. As a proof-of-concept, the beam shape of a THz Time Domain Spectrometer was measured. We demonstrate real time imaging at nine frames per second and show its potential for practical applications in transmission geometry covering both material science and security tasks. The results suggest that hidden items, complex structures and the moisture content of (biological) materials can be resolved. We discuss the limits of the current setup, possible improvements and potential (industrial) applications, and we outline the feasibility of imaging in reflection geometry or extending it to multi-spectral imaging using band pass filters. Full article
(This article belongs to the Special Issue Terahertz Imaging and Sensors)
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9 pages, 1955 KiB  
Article
Flexible Radio-Frequency Identification (RFID) Tag Antenna for Sensor Applications
by Mohammad Tariqul Islam, Touhidul Alam, Iskandar Yahya and Mengu Cho
Sensors 2018, 18(12), 4212; https://doi.org/10.3390/s18124212 - 30 Nov 2018
Cited by 44 | Viewed by 8028
Abstract
In this paper, an inkjet-printed flexible Radio-Frequency Identification (RFID) tag antenna is proposed for an ultra-high frequency (UHF) sensor application. The proposed tag antenna facilitates a system-level solution for low-cost and faster mass production of RFID passive tag antenna. The tag antenna consists [...] Read more.
In this paper, an inkjet-printed flexible Radio-Frequency Identification (RFID) tag antenna is proposed for an ultra-high frequency (UHF) sensor application. The proposed tag antenna facilitates a system-level solution for low-cost and faster mass production of RFID passive tag antenna. The tag antenna consists of a modified meander line radiator with a semi-circular shaped feed network. The structure is printed on photo paper using silver nanoparticle conductive ink. The generic design outline, as well as tag antenna performances for several practical application aspects are investigated. The simulated and measured results verify the coverage of universal UHF RFID band with an omnidirectional radiation pattern and a long-read range of 15 ft. In addition, the read range for different bending angles and lifetimes of the tag antenna are also demonstrated. Full article
(This article belongs to the Special Issue Antenna Technologies for Microwave Sensors)
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