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- 实验方案
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[IEEE 2018 International Conference on Current Trends towards Converging Technologies (ICCTCT) - Coimbatore (2018.3.1-2018.3.3)] 2018 International Conference on Current Trends towards Converging Technologies (ICCTCT) - Broadband Circularly Polarized U-Slot Antenna for Wireless Application
摘要： The antenna presented in this paper is a broadband circularly polarized U slot antenna. The circularly polarized radiation is achieved in this paper by suspending two separated rectangular strips from the inner edge of ground and using inverted L-shaped central feeding stub. The L-shaped stub is oriented at 90 degree with respect to grounded strips. The impedance bandwidth of the antenna proposed here varies from (4.68 - 6.42 GHz) which is 31.3% and the axial ratio bandwidth (<3 dB) is from (5.15-6.45 GHz) which is 22.4% for WLAN (ranging from 5.15 to 5.85 GHz) and WIMAX (5.8GHz,5.5 GHz) applications. The antenna is left and right hand circularly polarized in Z>0 and Z<0 directions respectively. A wide notch is cut from the ground which enhances the ARBW by 51.35% in comparison to simple square shaped ground. All the results have been simulated successfully.
关键词： circular polarization (CP),axial ratio bandwidth (ARBW),slot antenna,coplanar waveguide (CPW),wireless LAN
更新于2025-09-23 15:22:29
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Bandwidth-limited orbital angular momentum mode of Bessel Gaussian beams in the moderate to strong non-Kolmogorov turbulence
摘要： We investigate the effects of the moderate to strong fluctuation on the propagation of orbital angular momentum (OAM) modes carried by Bessel Gaussian beams in turbulent atmosphere. The analytic expression of the received probability of the signal and crosstalk OAM mode is derived based on the theories of extended Rytov and non-Kolmogorov turbulence. Our results show that turbulence with smaller non-Kolmogorov index, smaller inner-scale factor is more easily to induce OAM crosstalk between modes. With the increase of turbulence strength, the OAM spreads from adjacent modes to peripheral modes. Our results also indicate that the received signal intensity can be improved by use of Bessel Gaussian beams with small initial radii of beam, low OAM quantum number and long wavelength.
关键词： Bandwidth-limited mode,Non-Kolmogorov turbulence,Extended Rytov theory,Bessel Gaussian beam,Orbital angular momentum
更新于2025-09-23 15:22:29
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CPW-Fed Triple High Rejection Notched UWB & X-Band Antenna on Silicon for Imaging & Wireless Applications
摘要： In this paper, compact Coplanar Waveguide feed antenna covering UWB & X-Band signals (2.98GHz-13.34GHz) is presented. Antenna also offers triple notched band elimination (WiMAX: 3.40GHz-3.95GHz, WLAN: 4.50GHz-6.34GHz & Downlink Satellite System: 7.11GHz-7.802GHz) which are due to insertion of stub and etching of slots. Antenna is fabricated and characterized on silicon for imaging and wireless applications with having fractional bandwidth of 133%. The antenna offers gain, radiation efficiency and group delay between 3.26dBi-8.00dBi, 84%-92% and ≤ ±1.0ns respectively for the entire of its bandwidth. Isolation of antenna in face to face and side to side orientations are < -25dB with very less distortion presented in the transmission and reception of the signal. The radiations emitted by the antenna are observed as dipole like pattern in E-plane and omni-directional in H-plane.
关键词： radiation efficiency,Silicon,high rejection,fractional bandwidth,gain
更新于2025-09-23 15:22:29
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[IEEE 2018 Asia Communications and Photonics Conference (ACP) - Hangzhou, China (2018.10.26-2018.10.29)] 2018 Asia Communications and Photonics Conference (ACP) - High Upstream Bandwidth Utilization DWBA Algorithm for NG-EPON with Heterogeneous Propagation Delays
摘要： This paper proposes a novel dynamic wavelength and bandwidth allocation (DWBA) algorithm that provides high upstream channel bandwidth utilization and low average packet delay for NG-EPON. The proposed algorithm takes ONUs’ scheduling orders, the wavelength assigned to ONU and the grant size of ONU on the assigned wavelength into account. The simulation results show the validity of the proposed DWBA algorithm.
关键词： NG-EPON,Upstream channel wavelength utilization,Dynamic wavelength and bandwidth allocation (DWBA) algorithm
更新于2025-09-23 15:22:29
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Flexible Filtering Element on SOI with Wide Bandwidth tunability and Full FSR tuning
摘要： We demonstrate a Silicon-on-Insulator flexible filtering element, relying on two serially coupled micro ring resonators equipped with three thermo-optically tuned Mach-Zehnder interferometers, acting as variable optical couplers. A single electrode configuration is adopted, enabling the low-complexity thermo-optical control of the filtering element for bandwidth and wavelength tuneability. The module's performance has been studied in detail via simulation analysis and the obtained results were verified through experimental evaluation. Wide bandwidth tunability from 9 GHz to 103 GHz is achieved with a power efficiency of 0.284 mW/GHz, while full Free Spectral Range wavelength tuning is achieved with an efficiency of 0.297 mW/GHz. Module's insertion loss lays below 3 dB.
关键词： Silicon photonics,Optical switches,Microring resonators,Bandwidth flexibility,Thermo-optic control,Wavelength division multiplexing,Optical filters
更新于2025-09-23 15:22:29
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A 12.8-Gb/s Daisy Chain-Based Downlink I/F Employing Spectrally Compressed Multi-Band Multiplexing for High-Bandwidth, Large-Capacity Storage Systems
摘要： Toward the aim of realizing high-bandwidth, large-capacity nand flash memory-based storage systems, this paper presents a novel daisy-chain downlink interface (I/F) between a controller and a large number of nand packages. The daisy-chain I/F employs a tapered-bandwidth architecture with bridge-by-bridge data extraction based on a proposed spectrally compressed multi-band multiplexing (SCM2) technique to achieve low power consumption. By using the proposed downlink I/F, a nand controller can handle 32 low-cost nand packages while achieving 12.8-Gb/s throughput using two data wires. The fabricated prototype downlink I/F achieved a bit error rate (BER) of 10^-12 with power consumption of 252.1 mW for the transmitter and 375.7 mW for all four receivers together.
关键词： large capacity storage,inter-symbol interference (ISI),daisy chain,Toggle double data rate (DDR),multi-band multiplexing,inter-channel interference (ICI),high-speed I/F,Bridge interface (I/F),high bandwidth,NAND flash memory,multi-drop bus
更新于2025-09-23 15:22:29
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A Low-Profile and High-Gain CP Patch Antenna with Improved AR Bandwidth via Perturbed Ring Resonator
摘要： A low-profile circularly-polarized (CP) patch antenna with improved axial ratio (AR) bandwidth and high gain is proposed in this letter. The antenna consists of a pin-loaded patch and a probe-fed ring resonator beneath the patch radiator. On the one hand, the radiative patch dominates the radiation, and the loading of shorting pins facilitates its high gain due to enlarged radiating area at resonance. On the other hand, the ring resonator with perturbation produces two additional split degenerate modes, which not only widen the bandwidth of magnitude, but also generate the required quadrature phase shift for CP radiation. The working mechanism is presented with an equivalent circuit model, allowing us to easily demonstrate how the ring resonator and patch radiator work together to effectively widen AR bandwidth. With the proposed method, stable high gain of about 11 dBic has been realized over an AR bandwidth of 6% for a single-fed CP patch antenna with profile of 0.05λ0 at 2.33 GHz.
关键词： improved AR bandwidth,Stacked CP patch antenna,high gain,low profile,non-radiative resonator
更新于2025-09-23 15:22:29
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Interplay of Bit Rate, Linewidth, Bandwidth, and Reach on Optical DMT and PAM with IMDD
摘要： We theoretically compare the performance of optical discrete multi-tone (DMT) and pulse amplitude modulation (PAM) using intensity modulated, direct detection (IMDD). PAM is a lower cost, lower complexity solution than DMT, however it is more vulnerable to chromatic dispersion on the C band. We compare DMT and PAM taking into consideration the interplay of laser linewidth, fiber length, transmission rate, and channel bandwidth. We use a semi-analytical model to examine bit error rates. We study how system parameters shift the performance advantages between DMT and PAM. Our model can also be used to find the best hardware solution and frequency band for a target modulation format and bit error rate.
关键词： PAM,O-band,C-band,chromatic dispersion,DMT,bandwidth,laser linewidth
更新于2025-09-23 15:22:29
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Method to improve degraded range resolution due to non-ideal factors in FMCW radar
摘要： This paper reports a method to improve a degraded range resolution for FMCW radar. The proposed post-processing method can achieve an improved range resolution without increasing a signal bandwidth by eliminating factors that can degrade the range resolution based on the non-negative least-squares method. For an FMCW radar adopting the post-processing method with the center frequency of 76.5 GHz and the signal bandwidth of 200 MHz, simulation results show that the degraded range resolution of 160 cm is improved to 70 cm, and measurements show that two corner reflectors with the radar cross section of 10 dBsm located at 70 cm range intervals can be distinguished.
关键词： FMCW,non-negative least-squares method,radar,range resolution,signal bandwidth
更新于2025-09-23 15:22:29
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[IEEE 2018 Second International Conference on Advances in Electronics, Computers and Communications (ICAECC) - Bangalore (2018.2.9-2018.2.10)] 2018 Second International Conference on Advances in Electronics, Computers and Communications (ICAECC) - A comparitive study on the performance of circular patch antenna using low cost substrate for S-band applications
摘要： This paper focusses on comparison of the performance of Circular Microstrip Patch Antenna(CMPA) in S-band between CMPA with soil as substrate and CMPA with RT/Duroid 5880 as substrate. RT/Duroid 5880 is commonly used in the fabrication of Microstrip Patch Antennas (MPA) due to its low electrical loss, low dielectric loss, low moisture absorption etc. However, it is costly. This work tries to prove that soil substrate can be one of the contenders in the future to replace RT/Duroid 5880. The simulation is carried out in Computational Electromagnetic Software FEKO (suite 7.0). The paper concludes by stating that soil substrate being economical can be a potential candidate to replace RT/Duroid 5880 as there is very little to minimal change in key parameters such as bandwidth (a difference of 14.07 MHz), gain (a difference of 0.18 dBi) and directivity (a difference of 0.41 dBi) when the simulation results are compared.
关键词： antenna,patch,increasing gain,FEKO,dielectric constant,circular microstrip,enhancement of bandwidth
更新于2025-09-23 15:21:21