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- 摘要
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Design and Analysis of Conformal Antennas for Smart Glasses
摘要： The goal of this communication is to present novel wearable antenna integration in smart glasses. The conformal antennas are optimized to cover the triple frequency bands of mobile communication under -6dB, single band of WiFi and GPS below -10dB reflection coefficient. The measurement of the prototype, created in 3D printing technology, showed good agreement with the numerical simulation. The full wave simulation including the human head phantom exhibited minor effect on the antenna performance. SAR performance of the three antennas is investigated for the smart glasses application in the presence of the head phantom and it respects the corresponding FCC regulation.
关键词： 4G,phantom,conformal,triple band,WiFi,GPS,head,wearable,SAR,antenna
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Beam-steerable Multi-band Mm-wave Bow-tie Antenna Array for Mobile Terminals
摘要： A multiple-band 5G end-fire antenna array is proposed to be placed on the upper and bottom edges of mobile terminals. The antenna element consists of two bow-tie radiators designed to resonate at 28 and 60 GHz. A sixteen-element beam-steerable array is presented in this paper, with overall dimensions of 40.13×1.44×0.25 mm3. Only the odd elements are active in the 28-GHz band and the optimal termination of the parasitic elements is studied. The simulated results show a good match to a 50-ohm feeding line and end-fire radiation at the targeted frequency bands.
关键词： beam steering,mobile antenna,dual band,millimeter wave
更新于2025-09-04 15:30:14
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W-band Sparse Imaging System Using Frequency Diverse Cavity-Fed Metasurface Antennas
摘要： We experimentally demonstrate a frequency-diverse, computational imaging system at W-band frequencies utilizing an array of cavity-fed metasurface antennas. Each metasurface antenna consists of a cavity milled from aluminum stock, with an upper plate patterned with a set of radiating slots. As a function of frequency, the metasurface cavities produce a set of spatially diverse radiation patterns that probe the re?ectivity distribution of a scene. The antennas are designed to maximize the measurement diversity and hence imaging capacity of the system. The number and distribution of the radiating slots is optimized by balancing the cavity quality factor (Q) and Fourier space coverage. In the experimental realizations, the radiation patterns from each cavity-fed metasurface antenna is ?rst measured using near-?eld scanning techniques, propagated over the imaging domain, and then stored for use in the image reconstruction step. Comprehensive alignment procedure is implemented to align the measured radiation patterns with regard to the physical position of the cavities. Using a modeling platform, we ?nd excellent agreement between the simulation and experiment, indicating the validity of the calibration and alignment procedures. The scaling of the cavity-fed metasurface antenna represents a key step in the development of alternative high-frequency apertures for imaging and beam-forming applications.
关键词： Metasurface antennas,Resonant Cavity,W-Band,Millimeter waves,Frequency Diverse,Sparse Imaging
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Simplified Molecular Absorption Loss Model for 275-400 Gigahertz Frequency Band
摘要： This paper focuses on giving a simpli?ed molecular absorption loss model for a 275 – 400 GHz frequency band, which has signi?cant potential for variety of future short and medium range communications. The band offers large theoretical data rates with reasonable path loss to theoretically allow even up to kilometer long link distances when suf?ciently high gain antennas are used. The molecular absorption loss in the band requires a large number of parameters from spectroscopic databases, and, thus, the exact modeling of its propagation characteristics is demanding. In this paper, we provide a simple, yet accurate absorption model, which can be utilized to predict the absorption loss at the above frequency band. The model is valid at a regular atmospheric pressure, it depends on the distance, the relative humidity, and the frequency. The existing simpli?ed model by ITU does not cover frequencies above 350 GHz and has more complexity than our proposed model. The molecular absorption loss increases exponentially with the distance, decreasing the utilizable bandwidth in the vicinity of the absorption lines. We provide a model to approximate the window widths at the above frequency band. This model depends on the distance, the relative humidity, the frequency, and the maximum tolerable loss. It is shown to be very accurate below one kilometer link distances.
关键词： transmission window model,molecular absorption loss,275–400 GHz frequency band,simplified model
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Design of a Dual-band Wearable Planar Inverted F Antenna Based on Characteristic Mode Theory
摘要： This paper proposes a new wearable planar inverted F antenna (PIFA). The antenna is co-designed with the ground plane based on characteristic mode theory. To obtain a wide matching bandwidth around 433 MHz, the ground is operated as the main radiator. The 2.4 GHz operating band is realized by embedding a slot within the PIFA patch. The final design shows an extremely small electrical size, relatively wide bandwidths, and reasonable radiation efficiencies in both bands. An analysis of the effect of bending shows the robust performance of the antenna.
关键词： wearable antenna,planar inverted F antenna (PIFA),characteristic mode theory,dual-band antenna
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Radiation Characteristics of EWE Antenna on Actual Ground for Landslides Prediction Based on Bistatic Radar System Using AM Radio Broadcasting
摘要： The complex permittivities of the hydrated soil have been measured and the transmission characteristics of the electromagnetic wave in air-hydrated soil boundary have been calculated as the first step of the realization of the landslides prediction system so far. Consequently, it becomes obvious that the reflected wave from the hydrated soil increases as the water content increases and the transmitting wave decreases until it is difficult to measure. Keeping this results in mind, the antenna called EWE at operating frequency of 1MHz has been investigated in order to measure the reflected wave from lands in this paper. The miniaturization and the influence of the conductivity of the ground have been considered.
关键词： MF-Band,Landslides prediction,Antenna,Bistatic radar
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - An Ultra-thin Triple-band Metamaterial Absorber with Equivalent Circuit Analysis
摘要： A compact ultra-thin triple-band metamaterial absorber with polarization insensitiveness and wide-angle stability is presented in this paper. The unit cell of the absorber consists of a Jerusalem cross and a concentric circular ring imprinted on a dielectric substrate backed with a metal ground plane. Simulated results exhibit that the proposed absorber has three discrete absorption peaks at 4.4, 6.05, and 13.9 GHz with excellent absorption rates over 0.95. The current distribution and equivalent circuit analysis are investigated to analyze the near-unity absorption mechanism. The structure is then fabricated and experimentally characterized. The measured absorption response shows a good agreement with the simulated and calculated results.
关键词： metamaterial absorber,triple-band,equivalent circuit model
更新于2025-09-04 15:30:14
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A Compact Ka-Band Integrated Doherty Amplifier With Reconfigurable Input Network
摘要： In this paper, we present the design of an ultracompact monolithic millimeter-wave integrated circuit Doherty power amplifier (DPA) using a novel reconfigurable input network at Ka-band. The proposed input network is formed by a compact broadside coupler and two additional field-effect transistors. By reconfiguring the relative phase offset between the main and auxiliary amplifiers, the DPA can be postoptimized to achieve high efficiency and maximal power gain flatness. More importantly, the DPA can be tuned for the highest performance at different frequencies. To verify the concept, a DPA is fabricated in a 0.15-μm enhancement mode Gallium Arsenide (GaAs) process and exhibits a measured output power of 26.5 dBm and gain of 11.8 dB at 28 GHz. The peak power-added efficiency (PAE) is 42%, and the PAE at 6-dB output power backoff (PBO) is 31%, respectively. With reconfigurable capability, the DPA can maintain high performance over a 3-GHz frequency band from 26.5 to 29.5 GHz. To the best of the authors’ knowledge, the proposed DPA achieves among the highest backoff PAE over a wide bandwidth at Ka-band.
关键词： reconfigurable,Ka-band,gallium arsenide (GaAs),Doherty power amplifier (DPA),millimeter-wave integrated circuit (MMIC),Compact coupler
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Additive Manufacturing of Ku band Horn Antennas for Telecommunications Space Applications
摘要： This paper presents some recent achievements in the use of Metal Additive Manufacturing for horn antennas for space applications. Three prototypes of horn and cluster of horns are presented. Comparisons between simulations and measurements of RF performances are shown and some mechanical design to reduce mass are introduced. These new designs are possible thanks to the capabilities offered by Additive Manufacturing techniques.
关键词： Ku-band,Horn antenna,Additive Manufacturing,Laser Beam Melting
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Long-Term and Short-Term Atmospheric Impairments Forecasting for High Throughput Satellite Communication Systems
摘要： In this paper, three different methodologies are employed for the prediction of atmospheric attenuation for the performance evaluation of High Throughput Satellite Communication systems. The first one is based on numerical weather predictions and in particular the ECMWF forecasts that uses high resolution deterministic forecast and the probabilistic forecasts the perturbated products. The second methodology is based machine learning algorithms, which are advanced statistical methods. The two algorithms tested in this study are the random forest and the gradient boosting, both based on regression trees. Finally, the last method that is employed is the recurrent neural networks and in particular the Long Short Term Memory. These neural networks are used for the prediction of time series using memory blocks. All the algorithms are tested using data from the ALPHASAT experiment at Chilbolton and Chilton, UK. The obtained results are very encouraging.
关键词： radiowave propagation,forecast,Ka band and above,Satellite Communications,deep learning,machine learning
更新于2025-09-04 15:30:14