234 results found
Hu F, Lucyszyn S, 2015, Modelling Miniature Incandescent Light Bulbs for Thermal Infrared ‘THz Torch’ Applications, Journal of Infrared, Millimeter, and Terahertz Waves, Vol: 36, Pages: 350-367, ISSN: 1866-6892
The ‘THz Torch’ concept is an emerging technology that was recently introduced by the authors for implementing secure wireless communications over short distances within the thermal infrared (20-100 THz, 15 μm to 3 μm). In order to predict the band-limited output radiated power from ‘THz Torch’ transmitters, for the first time, this paper reports on a detailed investigation into the radiation mechanisms associated with the basic thermal transducer. We demonstrate how both primary and secondary sources of radiation emitted from miniature incandescent light bulbs contribute to the total band-limited output power. The former is generated by the heated tungsten filament within the bulb, while the latter is due to the increased temperature of its glass envelope. Using analytical thermodynamic modelling, the band-limited output radiated power is calculated, showing good agreement with experimental results. Finally, the output radiated power to input DC power conversion efficiency for this transducer is determined, as a function of bias current and operation within different spectral ranges. This modelling approach can serve as an invaluable tool for engineering solutions that can achieve optimal performances with both single and multi-channel ‘THz Torch’ systems.
Sun J, Hu F, Lucyszyn S, Challenges for the development of low cost thermal infrared 'THz Torch' spectrometers, BIT’s 4th Annual Conference and EXPO of AnalytiX-2015, Pages: 216-216
Sun J, Hu F, Wang Z, et al., 2015, Banknote Characterization using a Thermal Infrared 'THz Torch' Spectrometer, Asia-Pacific Microwave Conference (APMC), Publisher: IEEE
Jose Sanchez-Martinez J, Marquez-Segura E, Lucyszyn S, 2015, Synthesis and Design of High-Selectivity Wideband Quasi-Elliptic Bandpass Filters Using Multiconductor Transmission Lines, IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, Vol: 63, Pages: 198-208, ISSN: 0018-9480
Otter WJ, Hanham SM, Ridler NM, et al., Terahertz photonic crystal technology, Workshop on THz
Lucyszyn S, Hu F, Over the THz horizon: The thermal infrared ‘THz Torch’, 8th IEEE Global Symposium on Millimeter-Waves (GSMM2015)
Muller AA, Sanabria-Codesal E, Moldoveanu A, et al., 2014, Apollonius unilateral transducer constant power gain circles on 3D Smith charts, ELECTRONICS LETTERS, Vol: 50, Pages: 1531-1532, ISSN: 0013-5194
Papantonis S, Ridler NM, Wilson A, et al., 2014, Reconfigurable Waveguide for Vector Network Analyzer Verification, IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, Vol: 62, Pages: 2415-2422, ISSN: 0018-9480
Otter WJ, Hanham SM, Ridler NM, et al., 2014, 100 GHz ultra-high Q-factor photonic crystal resonators, SENSORS AND ACTUATORS A-PHYSICAL, Vol: 217, Pages: 151-159, ISSN: 0924-4247
Otter WJ, Hu F, Hazell JF, et al., 2014, THz metal mesh filters on electrically thick fused silica substrates, Infrared Milliemter-Wave andTHz Waves Conference, Publisher: IEEE
This paper shows simulated and measured results of ultra-low cost metal mesh filters on electrically thick substrates for millimeter-wave and THz bands. It provides a broad overview of metal mesh filters currently available and suggest why it is worth moving to an electrically thick substrate for ultra-low cost applications. We demonstrate scalable traditional metal mesh filters on 525 μm thick fused silica substrates. In addition, trapped-mode excitation is exploited to improve out-of-band rejection at higher frequencies. The measured results prove that these filters are scalable in the THz range using cost-effective micromachining manufacturing. This work opens up the possibility of using electrically thick metal mesh filters for ultra-low cost applications.
Jose Sanchez-Martinez J, Marquez-Segura E, Lucyszyn S, 2014, Design of Compact Wideband Bandpass Filters Based on Multiconductor Transmission Lines With Interconnected Alternate Lines, IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, Vol: 24, Pages: 454-456, ISSN: 1531-1309
Liang X, Hu F, Yan Y, et al., 2014, Secure thermal infrared communications using engineered blackbody radiation, Scientific Reports, Vol: 4, Pages: 1-7
The thermal (emitted) infrared frequency bands, from 20–40 THz and 60–100 THz, are best known for applications in thermography. This underused and unregulated part of the spectral range offers opportunities for the development of secure communications. The ‘THz Torch’ concept was recently presented by the authors. This technology fundamentally exploits engineered blackbody radiation, by partitioning thermally-generated spectral noise power into pre-defined frequency channels; the energy in each channel is then independently pulsed modulated and multiplexing schemes are introduced to create a robust form of short-range secure communications in the far/mid infrared. To date, octave bandwidth (25–50 THz) single-channel links have been demonstrated with 380 bps speeds. Multi-channel ‘THz Torch’ frequency division multiplexing (FDM) and frequency-hopping spread-spectrum (FHSS) schemes have been proposed, but only a slow 40 bps FDM scheme has been demonstrated experimentally. Here, we report a much faster 1,280 bps FDM implementation. In addition, an experimental proof-of-concept FHSS scheme is demonstrated for the first time, having a 320 bps data rate. With both 4-channel multiplexing schemes, measured bit error rates (BERs) of < 10−6 are achieved over a distance of 2.5 cm. Our approach represents a new paradigm in the way niche secure communications can be established over short links.
Hu F, Lucyszyn S, 2014, Emerging thermal infrared ‘THz Torch’ technology for low-cost security and defence applications, THz and Security Applications: Detectors, Sources and Associated Electronics for THz Applications, Editors: Sizov, Corsi, Publisher: Springer Netherlands, Pages: 239-275, ISBN: 978-94-017-8827-4
Carvalho NB, Georgiadis A, Costanzo A, et al., 2014, Wireless Power Transmission: R&D Activities Within Europe, IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, Vol: 62, Pages: 1031-1045, ISSN: 0018-9480
Papantonis S, Ridler NM, Lucyszyn S, 2014, Rectangular waveguide enabling technology using holey surfaces and wire media metamaterials, SENSORS AND ACTUATORS A-PHYSICAL, Vol: 209, Pages: 1-8, ISSN: 0924-4247
Papantonis S, Lucyszyn S, Shamonina E, 2014, Dispersion effects in Fakir's bed of nails metamaterial waveguides, JOURNAL OF APPLIED PHYSICS, Vol: 115, ISSN: 0021-8979
Liang X, Hu F, Yan Y, et al., 2014, Link Budget Analysis for Secure Thermal Infrared Communications using Engineered Blackbody Radiation, 29th URSI General Assembly and Scientific Symposium (URSI GASS), Publisher: IEEE
Hu F, Liang X, Lucyszyn S, 2014, Multi-channel Thermal Infrared Communications using Engineered Blackbody Radiation for Security Applications, Conference on Optics and Photonics for Counterterrorism, Crime Fighting, and Defence X; and Optical Materials and Biomaterials in Security and Defence Systems Technology XI, Publisher: SPIE-INT SOC OPTICAL ENGINEERING, ISSN: 0277-786X
Klein N, Hanham SM, Basey-Fisher TH, et al., 2014, Micro- and millimetre wave measurements of nanolitre biological liquids by dielectric resonators, IEEE MTT-S International Microwave Workshop Series on: RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-Bio 2014), Publisher: IEEE
Hu F, Lucyszyn S, 2014, Noise Analysis for Multi-channel 'THz Torch' Thermal Infrared Wireless Communications Systems, 3rd Asia-Pacific Microwave Conference Proceedings (APMC), Publisher: IEEE, Pages: 1276-1278
Otter WJ, Hanham SM, Ridler N, et al., MM-wave photonic crystal technology, IET Colloquium on Millimetre-wave and Terahertz Engineering & Technology
Otter WJ, Hu F, Lucyszyn S, Scalable metal mesh filters for low cost THz applications, International Conference on Semiconductor Mid-IR Materials and Optics (SMMO2014)
Hu F, Lucyszyn S, Thermal infrared communications, IoP Photon14
Otter WJ, Hu F, Hazell J, et al., From mm-wave to THz: scalable filter design for ultra-low cost applications, ARMMS RF & Microwave Society Conference
D'Auria M, Sunday A, Hazell J, et al., Enabling technology for ultralow-cost RF MEMS switches on LTCC, ARMMS RF & Microwave Society Conference
Otter WJ, Hanham SM, Klein N, et al., 2014, W-band Laser-controlled Photonic Crystal Variable Attenuator, IEEE MTT-S International Microwave Symposium (IMS), Publisher: IEEE, ISSN: 0149-645X
Hu F, Otter WJ, Lucyszyn S, THz metal mesh filters on thick fused silica substrate, International Conference on THz and Mid Infrared Radiation and Applications to Cancer Detection using Laser Imaging, Workgroup Meetings of COST ACTIONs MP1204 and BM1205
Pinuela M, Mitcheson PD, Lucyszyn S, 2013, Ambient RF energy harvesting in urban and semi-urban environments, Transactions on Microwave Theory and Techniques, Vol: 61, Pages: 2715-2726, ISSN: 0018-9480
Pinuela M, Yates DC, Lucyszyn S, et al., 2013, Maximizing DC-to-Load Efficiency for Inductive Power Transfer, IEEE Transactions on Power Electronics, Vol: 28, Pages: 2437-2447, ISSN: 0885-8993
Inductive Power Transfer (IPT) systems for transmitting tens to hundreds of watts have been reported for almost a decade. Most of the work has concentrated on the optimization of the link efficiency and have not taken into account the efficiency of the driver. Class-E amplifiers have been identified as ideal drivers for IPT applications, but their power handling capabilityat tens of MHz has been a crucial limiting factor, since the load and inductor characteristics are set by the requirements of the resonant inductive system. The frequency limitation of the driver restricts the unloaded Q factor of the coils and thus the link efficiency. With a suitable driver, copper coilunloaded Q factors of over 1,000 can be achieved in the low MHz region, enabling a cost-effective high Q coil assembly. The system presented in this paper alleviates the use of heavy andexpensive field-shaping techniques by presenting an efficient IPT system capable of transmitting energy with a dc-to-load efficiency above 77% at 6 MHz across a distance of 30 cm. To the authorsknowledge this is the highest dc-to-load efficiency achieved for an IPT system without introducing restrictive coupling factor enhancement techniques.
Lucyszyn S, Pranonsatit S, 2013, RF MEMS for antenna applications, European Conference on Antennas and Propagation (EUCAP 2013), Pages: 1988-1992
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