2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)最新文献_第8页

Three Planar Devices for Extracting Capacitance per Unit Length 三种提取单位长度电容的平面装置

2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS) Pub Date : 2019-11-01 DOI: 10.1109/COMCAS44984.2019.8958422

N. Popovic, E. Marksz, A. Hagerstrom, J. Booth, E. Garboczi, N. Orloff, C. Long

引用次数: 1

Improved THz Reception by Non-Conventional Structure of Planar Dipole Antenna with Superconducting Josephson Junction Detector 利用超导约瑟夫森结探测器的平面偶极子天线的非常规结构改进太赫兹接收

2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS) Pub Date : 2019-11-01 DOI: 10.1109/COMCAS44984.2019.8958169

E. Holdengreber, M. Mizrahi, V. Khavkin, S. Schacham, E. Farber

{"title":"Improved THz Reception by Non-Conventional Structure of Planar Dipole Antenna with Superconducting Josephson Junction Detector","authors":"E. Holdengreber, M. Mizrahi, V. Khavkin, S. Schacham, E. Farber","doi":"10.1109/COMCAS44984.2019.8958169","DOIUrl":"https://doi.org/10.1109/COMCAS44984.2019.8958169","url":null,"abstract":"Intensity and frequency of THz RF radiation are easily derived from superconducting Josephson junctions detectors I-V characteristics. The RF radiation generates current steps, correlated to intensity. The voltage at the steps renders accurately the RF frequency. DC measurements simplify significantly the detection systems. Implementing junctions in high temperature superconductors, requiring liquid nitrogen cooling only, reduces drastically operating complexity and cost. System efficiency is highly sensitive to impedance mismatch between antenna and low impedance junction. We propose improved planar dipole antenna structure, where the junction is placed between the ends of two strips, removed from the dipole. Theoretical RF analysis of the influence of junction parameters on input impedance was carried out. Extensive simulations of detection system were performed. High impedance matching was obtained for 195 to 215GHz, show high directivity, with radiation gain of 5. 22dB and low return losses of 35dB.","PeriodicalId":276613,"journal":{"name":"2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124203726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

LOS Classification of UAV-to-Ground Links in Built-Up Areas 楼宇密集区无人机对地链路的LOS分类

2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS) Pub Date : 2019-11-01 DOI: 10.1109/COMCAS44984.2019.8958045

Eran Greenberg, Amitay Bar, Edmund Klodzh

{"title":"LOS Classification of UAV-to-Ground Links in Built-Up Areas","authors":"Eran Greenberg, Amitay Bar, Edmund Klodzh","doi":"10.1109/COMCAS44984.2019.8958045","DOIUrl":"https://doi.org/10.1109/COMCAS44984.2019.8958045","url":null,"abstract":"The use of UAVs for various applications is a rapidly growing research field nowadays. Knowledge of the wireless UAV-to-ground propagation channel is crucial for designing an efficient communication system and for evaluating its performance. The presence of LOS is essential for radio network planning and RF coverage prediction. Built-up areas contain a mixture of LOS and NLOS conditions due to buildings shadowing, states which cannot be easily distinguishable. Hence ray-tracing simulations were performed to model the UAV trajectory, the site-specific urban environment and terrain. In this contribution we develop a method to identify the LOS and the NLOS conditions based on the NB and WB channel statistical parameters: received power, K-factor, mean ToA and delay spread, and their combinations. Population classifications using a single feature and multiple features were investigated. We found that a classification between LOS and NLOS populations based on a single feature leads to poor to moderate performances depending on the feature. However, combing a few features improved the classification performance. Variances of KNN, decision tree and SVM classifiers were trained based on all features, resulting in good true positive and true negative rates of 87% and 75%, respectively.","PeriodicalId":276613,"journal":{"name":"2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129496432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Radiation Characteristics of Gregorian Antennas with Resonant Size Reflectors 谐振尺寸反射器格里高利天线的辐射特性

2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS) Pub Date : 2019-11-01 DOI: 10.1109/COMCAS44984.2019.8958049

Oleh Sukharevskyi, S. Nechitaylo, V. Vasilets

引用次数: 0

A Technique for Nanoscale Modeling of Uniaxial Spheroids 单轴球体的纳米尺度建模技术

2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS) Pub Date : 2019-11-01 DOI: 10.1109/COMCAS44984.2019.8958107

G. Kolezas, G. P. Zouros, G. Pagiatakis, J. Roumeliotis

{"title":"A Technique for Nanoscale Modeling of Uniaxial Spheroids","authors":"G. Kolezas, G. P. Zouros, G. Pagiatakis, J. Roumeliotis","doi":"10.1109/COMCAS44984.2019.8958107","DOIUrl":"https://doi.org/10.1109/COMCAS44984.2019.8958107","url":null,"abstract":"In this work we develop a technique for nanoscale modeling of uniaxially anisotropic prolate spheroidal nanoantennas. To this end, we develop a formal series solution, valid for any aspect ratio of the spheroidal nanoantenna. To solve the problem, we follow a two-step procedure: first, spherical vector wave functions with discrete wavenumbers are used for the expansion of the fields in the domain of the anisotropic scatterer. Second, these spherical expansions are transformed to spheroidal ones, using suitable expansions relating the spherical vector wave functions with the spheroidal ones. Then, satisfying the boundary conditions at the spheroidal surface, we obtain infinite sets of nonhomogeneous equations from which, upon truncation, we may calculate the bistatic and the total scattering cross section. We sufficiently compare the cross sections obtained by the developed method, for different values of aspect ratio and anisotropy, with the discrete dipole approximation method. The magnetic and electric dipolar resonances are then investigated in the context of nanoantenna design.","PeriodicalId":276613,"journal":{"name":"2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129882838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Novel Conception of Loss Tangent Media Measurement with Laser-Driven Gallium Arsenide Switches 激光驱动砷化镓开关测量损耗切线介质的新概念

2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS) Pub Date : 2019-11-01 DOI: 10.1109/COMCAS44984.2019.8958380

M. Kulygin, E. Novikov, I. Litovsky, R. Rozental

引用次数: 2

Metasurfaces for Radar Cross-Section Reduction 减少雷达横截面的超表面

2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS) Pub Date : 2019-11-01 DOI: 10.1109/COMCAS44984.2019.8958162

C. Balanis, A. Modi

引用次数: 0

FAST A+: A Cost-Effective Plan for Expanding FAST FAST A+:一个具有成本效益的FAST扩展计划

2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS) Pub Date : 2019-11-01 DOI: 10.1109/COMCAS44984.2019.8958208

Di Li, R. Duan

引用次数: 1

Optimisation of a Doherty power amplifier based on dual-input characterisation 基于双输入特性的Doherty功率放大器优化

2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS) Pub Date : 2019-11-01 DOI: 10.1109/COMCAS44984.2019.8958432

A. Piacibello, R. Quaglia, V. Camarchia, C. Ramella, M. Pirola

{"title":"Optimisation of a Doherty power amplifier based on dual-input characterisation","authors":"A. Piacibello, R. Quaglia, V. Camarchia, C. Ramella, M. Pirola","doi":"10.1109/COMCAS44984.2019.8958432","DOIUrl":"https://doi.org/10.1109/COMCAS44984.2019.8958432","url":null,"abstract":"The success of the Doherty architecture compared to other efficiency enhancement techniques derives mainly from its simple design and full-RF nature, not requiring complex digital signal processing to achieve high back-off efficiency. In this work we propose a design strategy for the optimisation of a Doherty power amplifier to mitigate the typical practical issues of this architecture related to inaccuracy of the non-linear model and of the manufacturing. The approach is based on the experimental characterisation of a dual-input Doherty prototype without input section. This test structure is obtained from a single-input Doherty amplifier, designed only through non-linear simulations, by removing the input section and allowing for separate control of the two RF inputs. From the collected data, approximated functions for the phase shift and power splitting versus frequency are identified to be realizable in hardware with RF networks. Compared to the reference single-input Doherty stage, a significantly improved behavior is registered in terms of output power (up to 2.7 dB), efficiency at saturation and back-off (30 % and 15 % respectively) and power gain (2 dB).","PeriodicalId":276613,"journal":{"name":"2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)","volume":"33 44","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120929918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Array-Level Approach to Nonlinear Equalization 非线性均衡的阵列级方法

2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS) Pub Date : 2019-11-01 DOI: 10.1109/COMCAS44984.2019.8958304

Nicholas Peccarelli, C. Fulton

引用次数: 2