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- reconfigurable feed network
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- Optoelectronic Information Science and Engineering
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- Nanjing University of Aeronautics and Astronautics
- University of Alberta
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Differentially-Fed Aperture-Coupled Magneto-Electric Dipole Antenna With Continuously Variable Beamwidth
摘要： A beamwidth reconfigurable linear array antenna utilizing three magneto-electric (ME) dipole antenna elements with no need for a complex feeding network is presented. In this design, the ME dipole antenna elements are differentially excited by three parallel transverse resonant slots etched on the broad wall of a substrate integrated waveguide (SIW) cavity. By symmetrically embedding four copper posts that are connected to varactor diodes between the adjacent slots, the electric field perturbation in the SIW cavity can be realized by manipulation of the varactors. In other words, altering bias voltage of all the varactors simultaneously could offer granular control over the excitation amplitude and phase of the antenna elements. Consequently, continuously variable beamwidth of the antenna can be obtained under electronic control. A fully operational prototype was designed, fabricated, and tested to validate the proposed design. Measured results indicate that the overlapped -10 dB impedance bandwidth of the proposed antenna is 19.6% and the half-power beamwidth (HPBW) in the E-plane is capable of varying from 39° to 107° within the operating frequency band.
关键词： Beamwidth reconfigurable antenna,varactor diode,substrate integrated waveguide (SIW),magneto-electric (ME) dipole
更新于2025-09-23 15:19:57
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[IEEE 2019 Joint International EUROSOI Workshop and International Conference on Ultimate Integration on Silicon (EUROSOI-ULIS) - Grenoble, France (2019.4.1-2019.4.3)] 2019 Joint International EUROSOI Workshop and International Conference on Ultimate Integration on Silicon (EUROSOI-ULIS) - Thin Si channel Back Enhanced (BE) SOI pMOSFET Photodetector under different bias conditions
摘要： This paper explores the light sensitivity of the new Back Enhanced (BE) SOI MOSFET. This new device has a reconfigurable operation (can work both like p- and n-type transistors depending on the back gate bias) and an extremely simple fabrication process, without any intentional doping steps and a planar structure. Two different bias conditions to detect light will be compared aiming a higher difference of drain current (sensitivity). The first one is based on better conduction due to the optical generation and the other thanks to the threshold voltage variation. Experimental analysis were performed and the results were compared for different bias conditions.
关键词： reconfigurable devices,BE SOI pMOSFET,light sensor
更新于2025-09-23 15:19:57
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Reconfigurable Plasmonic Nanostructures Controlled by DNA Origami
摘要： Precise surface functionalization and reconfigurable capability of nanomaterials are essential to construct complex nanostructures with specific functions. Here we show the assembly of a reconfigurable plasmonic nanostructure, which executes both conformational and plasmonic changes in response to DNA strands. In this work, different sized gold nanoparticles(AuNPs) were arranged site-specifically on the surface of a DNA origami clamp nanostructure. The opening and closing of the DNA origami clamp could be precisely controlled by a series of strand displacement reactions. Therefore, the patterns of these AuNPs could be switched between two different configurations. The observed plasmon band shift indicates the change of the plasmonic interactions among the assembled AuNPs. Our study achieves the construction of reconfigurable nanomaterials with tunable plasmon ic interactions, and will enrich the toolbox of DNA-based functional nanomachinery.
关键词： DNA origami,Reconfigurable nanostructure,Gold nanoparticle,Plasmonic nanostructure
更新于2025-09-23 15:19:57
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[IEEE NAECON 2019 - IEEE National Aerospace and Electronics Conference - Dayton, OH, USA (2019.7.15-2019.7.19)] 2019 IEEE National Aerospace and Electronics Conference (NAECON) - Development of Optically Controlled Tunable/Reconfigurable Terahertz Waveguide Circuits/Components For Advanced Sensing and Adaptive Wireless Communications
摘要： We report our recent progress toward the development of optically controlled tunable/reconfigurable THz circuits/components in waveguide configurations for advanced sensing and adaptive wireless communications. The development and demonstration of a modified WR-4.3 variable waveguide attenuator based on photo-excited Si with 60-dB range and 0.7-dB insertion loss will first be reviewed. Then the investigation of a WR-5.1 reconfigurable band-stop filter (BSF) prototype based on photo-induced electromagnetic band gap (PI-EBG) structures using semiconductor mesa arrays will be presented. The center frequency of the BSF can be reconfigured from 166-200 GHz with adjustable stop-band rejection and bandwidth. Finally, the development of high-performance THz integrated switches using the same optical control methodology will be envisioned, investigated and discussed. Preliminary results reveal that the optically controlled RF figure-of-merit (evaluated by RonCorr constant) of 153 THz, allowing them to outperform both conventional solid-state-device-based (e.g., HEMTs) and emerging phase-changing-material-based (e.g., VO2) counterparts, and therefore promising to compete with MEMS switches in the mmW-THz region for a novel class of tunable/reconfigurable circuits/components.
关键词： Terahertz,tunable/reconfigurable,imaging,waveguides,optical tuning,wireless communication,THz devices
更新于2025-09-23 15:19:57
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Spoof Surface Plasmon Polaritons Based Reconfigurable Band-Pass Filter
摘要： This letter reports the design and analysis of the bandwidth (B.W.) reconfigurable band-pass filter using spoof surface plasmon polaritons at THz/Microwave frequency. The designed filter consists of a spoof SPP T-shape resonator in which tuning has been introduced using variable capacitor device (having a cutoff frequency in THz regimes). Even and odd mode analysis has been carried out for a better understanding of the phenomenon. The proposed concept of variable bandwidth at a THz frequency in SSPP structure has been demonstrated through Co-EM simulation. For the experimental validation of the proposed approach, the filter has been designed at microwave frequency and developed on a 60 mil (1.52mm) thick microwave laminate and characterized using Keysight Field-Fox analyzer N9918A. In THz and microwave frequency regime, the designed filter has 3dB B.W. reconfigurability of 20GHz (0.41THz-0.43THz) and 300MHz (100MHz – 400MHz) with the insertion loss (I.L.) of ~3dB and ~1.7dB - 3.2dB respectively. The Proposed reconfigurable band-pass filter will pave an important role in the design and development of plasmonic circuits and systems.
关键词： bandwidth,reconfigurable,spoof surface plasmon polaritons,Band-pass filter
更新于2025-09-19 17:15:36
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[IEEE 2018 NASA/ESA Conference on Adaptive Hardware and Systems (AHS) - Edinburgh (2018.8.6-2018.8.9)] 2018 NASA/ESA Conference on Adaptive Hardware and Systems (AHS) - A 400 Mrad radiation-hardened optoelectronic embedded system with a silver-halide holographic memory
摘要： The paper discusses the development and characterization of an optically reconfigurable gate array (ORGA) with a holographic memory system, focusing on its application in adaptive hardware systems. It presents experimental results on the performance and reliability of the ORGA under radiation conditions, comparing it with traditional FPGAs.
关键词： Adaptive Hardware,Radiation Hardness,FPGA,Optically Reconfigurable Gate Array,Holographic Memory
更新于2025-09-19 17:15:36
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[IEEE 2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP) - Auckland (2018.8.5-2018.8.8)] 2018 IEEE Asia-Pacific Conference on Antennas and Propagation (APCAP) - A Wide-Angle Pattern Reconfigurable Antenna Realized by Meta-surface
摘要： This paper presents a wide-angle pattern reconfigurable antenna which has good directivity. The main lobe direction of the pattern can be switched between (cid:537)=±45o when (cid:182)=90o in the whole working frequency band. In addition, the structure of the antenna can be divided into three layers. The bottom layer is a feed line. The middle layer is the ground with slots. And the top is a novel meta-surface (MS). Reconfiguration is designed to achieve by controlling the state of PIN diode switches on the MS. This antenna is low profile and small volume. And the working frequency is from 4.95GHz to 5.05GHz.
关键词： pattern reconfigurable antenna,Wide-angle,MS
更新于2025-09-19 17:15:36
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New Spectrum Efficient Reconfigurable Filtered-OFDM Based L-Band Digital Aeronautical Communication System
摘要： To meet an ever-increasing demand of the spectrum for aeronautical communication, we propose new L-band digital aeronautical communication system (LDACS) using reconfigurable filtered OFDM (Ref-OFDM). The proposed protocol enables transceivers to dynamically adapt the transmission bandwidth over a wide range to meet the desired quality of service, and high out-of-band attenuation leads to significant improvement in the vacant spectrum utilization. We support our claims via simulation and complexity comparison results for various realistic channel conditions.
关键词： Air to ground communication,air-traffic management (ATM),Spectrum efficiency,Reconfigurable Filtered OFDM,L-band Digital Aeronautical Communication System (LDACS)
更新于2025-09-19 17:15:36
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[IEEE 2018 Asia-Pacific Microwave Conference (APMC) - Kyoto, Japan (2018.11.6-2018.11.9)] 2018 Asia-Pacific Microwave Conference (APMC) - Reconfigurable Metasurface as Microwave Reflectors and Polarization Converters
摘要： An ultrathin metasurface is made reconfigurable through the use of unit cells incorporating voltage-controlled varactor diodes. The phase characteristics of each unit cell are individually controlled for reconfigurability mechanisms. Two main applications are proposed in the domain of microwave devices and antennas. The planar metasurface is illuminated by a primary source and is firstly used as reconfigurable reflector allowing beam steering performances and frequency agility. A second functionality is also demonstrated, where the metasurface is used as a reconfigurable polarizer. Measurements are performed on a fabricated prototype to validate the concept.
关键词： frequency agility,reconfigurable reflector,polarizer,antennas,planar metasurface
更新于2025-09-19 17:15:36
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Beam reconfigurable holographic artificial impedance surface at terahertz band
摘要： A novel design method to achieve beam reconfigurable holographic artificial impedance surface (HAIS) is proposed in this article. Modified modulation equations are presented to achieve the desired single main beam radiation, whereas mushroom-shaped high-impedance surface (MSHIS) is introduced to suppress the side lobes. Furthermore, a method called matrix approximation is proposed for the first time, and based on this, reconfigurable radiation beams are implemented. For demonstration purposes, a prototype HAIS is designed at THz band. The demonstrator has a size of approximately 4.7λ×3.5λ, where λ is the wavelength in free space at 1 THz. Results indicate that along the desired elevation angles, reconfigurable radiation beams at ?70°, ?60°, ?40°, 0°, 40°, 60°, and 70° can be achieved, where all radiations are single main beams. Compared to the conventional metasurface and pattern reconfigurable antenna arrays, the proposed HAIS characterizes low profile and high gain, while avoiding complex feeding networks. All discussions are numerically evaluated and validated by a beam reconfigurable HAIS.
关键词： holographic antenna,artificial impedance surface,pattern reconfigurable
更新于2025-09-19 17:15:36