2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)最新文献

{"title":"Architecture and research of M2M wireless mesh networks","authors":"Vladislavs Nazarovs, J. Jelinskis, J. Porins, I. Lavrinovica, A. Supe, Vitalijs Aispurs","doi":"10.1109/PIERS.2017.8262172","DOIUrl":"https://doi.org/10.1109/PIERS.2017.8262172","url":null,"abstract":"In this paper, wireless mesh network was explored in a simulative and experimental way based on Dash7 wireless transmission technology. The aim of the research is to study Dash7 Alliance Protocol implemented device operation in an experimental wireless sensor network (WSN) model to find out, whether it is possible to provide a WSN coverage for a typical urban district area in Riga city and establish successful machine-to-machine (M2M) communication. Experimental custom made WSN data transmission device was created and used also to analyze power consumption in different transmission modes.","PeriodicalId":387984,"journal":{"name":"2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133919072","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}

{"title":"Low-profile planar multiport elliptical patch antenna for wireless communication applications","authors":"S. Mahmoud, M. G. Wahab, W. Swelam","doi":"10.1109/PIERS.2017.8261905","DOIUrl":"https://doi.org/10.1109/PIERS.2017.8261905","url":null,"abstract":"This paper introduces elliptical patch antenna with three feeding ports A previous design was introduced two port elliptical patch loaded with defected ground structure which acts as two independent antennas [1]. The proposed design is a modified version of the previously proposed one by adding a third rectangular strip in the ground plane. This strip has two optimized slots with different dimensions. The modifications proposed in this paper enable the antenna to operate at three bands instead of two as in the previous design while maintaining the compactness of the antenna The proposed antenna has a small size with overall dimensions 30 × 30 mm2, and operates over the frequency ranges, 3.67–3.95 GHz, 5.3–5.5 GHz, and 5.7–5.9 GHz Thus, the proposed configuration acts as triple resonator and decoupling circuit embedded within the antenna structure with no additional cost. In addition, the simulation results have been shown that VSWR of the designed antenna is less than 1.5 at the resonant frequencies of the three ports. The presented multiport elliptical antenna structure has been analyzed, investigated and optimized using Finite Integral Technique (FIT) numerical method Good port isolation has been achieved. The proposed antenna structure is suitable for wireless communication applications.","PeriodicalId":387984,"journal":{"name":"2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115409246","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}

{"title":"Numerical solution of problem of electromagnetic wave diffraction by a perfectly conducting body of small thickness","authors":"S. Fetisov, A. Setukha","doi":"10.1109/PIERS.2017.8262214","DOIUrl":"https://doi.org/10.1109/PIERS.2017.8262214","url":null,"abstract":"The problem of electromagnetic wave diffraction by perfectly conducting body of small thickness is considered. The classic model, based on the solution of the boundary value problem for the Maxwell equations by the method of boundary integral equations is used. The authors applied an approach, based on reducing the problem to integral equations with hypersingular integrals in the sense of the Hadamard finite value. These equations are solved numerically using the methods of piecewise constant approximations and collocations. The numerical experiment shows that in the case of objects with a small bodily thickness, to improve the accuracy of the numerical solutions, it is necessary to improve the accuracy of calculating the integrals with weak singularity. We used the quadrature formulas, based on the additional splitting of main surface mesh cells into smaller cells and smoothing of singularity of integrand function in small neighborhood of the singular point.","PeriodicalId":387984,"journal":{"name":"2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114658251","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}

{"title":"Spectral variability of the atmosphere downwelling radiation measured by microwave radiometer-spectrometer in the range of 18–27 GHz","authors":"M. Smirnov, V. P. Savorsky, D. Ermakov, B. Kutuza, S. Turygin","doi":"10.1109/PIERS.2017.8261865","DOIUrl":"https://doi.org/10.1109/PIERS.2017.8261865","url":null,"abstract":"Measurements were made with use of microwave radiometer-spectrometer P22M working in the range of 18–27.2 GHz with a spectral resolution of 200 MHz. Experimental results were compared with model calculations. Along with general correspondents of experimental and model results, there are some mismatches in the details. Variability of spectral characteristics of radiation is analyzed on a series of measurements obtained under different weather conditions: clear sky, clouds and the initial stage of precipitation. Such measurement may be useful for development of new techniques in vertical atmospheric profiles retrieval.","PeriodicalId":387984,"journal":{"name":"2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114669756","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}

{"title":"High efficiency horn with hexagonal aperture for antenna arrays","authors":"Y. Krivosheev, A. Shishlov","doi":"10.1109/PIERS.2017.8262090","DOIUrl":"https://doi.org/10.1109/PIERS.2017.8262090","url":null,"abstract":"High aperture efficiency horn antenna with hexagonal aperture is proposed. Such horns can be used as elements of antenna arrays with hexagonal (triangular) grid. Hexagonal aperture allows to fill aperture of the arrays without gaps. Also, proposed horn has optimized profile, so that field distribution in its aperture is close to uniform. This allows to increase gain and aperture efficiency of the antenna compared with other horn antennas for arrays with hexagonal grid. The proposed horn antenna can be used in direct radiating arrays or in feed arrays of multibeam and array-fed reflector antennas.","PeriodicalId":387984,"journal":{"name":"2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121045128","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}

{"title":"A mechanism of QML lasing in solid-state laser with an acousto-optic travelling wave modulator","authors":"O. Nanii, A. Fedoseev, A. Odintsov, A. Smirnov","doi":"10.1109/PIERS.2017.8261772","DOIUrl":"https://doi.org/10.1109/PIERS.2017.8261772","url":null,"abstract":"Lasing which simultaneously combines Q-switch and mode locking (QML lasing) is of interest as it demonstrated high peak intensity of the pulse sequence. Recently a new method was offered and demonstrated experimentally for achieving QML lasing using only a single acousto-optic modulator (AOM) with travelling wave in combination with a spherical mirror of a cavity [1,2]. In this report we present for the first time theoretical description of QML lasing in solid-state lasers with travelling wave AOM. Traditionally travelling wave AOM is used to modulate the Q-factor and forced the laser to operate in Q-switch regime. The same AOM can be used for simultaneous mode-locking by returning twice diffracted beam into the cavity. In this case the frequency of the light beam, injected into the cavity is shifted in a frequency by a value equal to double frequency of the acoustic wave. If an intermode interval δv<inf>c</inf> = vj<inf>+1</inf> — vj is equal to double frequency of the acoustic wave a part of the field of j mode will be injected into following (j + 1) mode. In our model the dynamics of lasing is described by a set of balance equations for complex amplitudes Ej and phases φj. The simulations were performed for a set of numerical parameters, which specifies Nd:YAG lasing at the significant excess of the gain over the threshold. The value of I<inf>d</inf> were varied in the range from 10^∼2 to 10^∼3. We assumes that the gain line is broadened uniformly in frequency and in a space. Field damping increment is consisted of two parts: γ = γ<inf>ph</inf> + γ<inf>d</inf>. First one γ<inf>ph</inf> is associated with permanent losses of resonator and the second Y<inf>d</inf> varies with the AOM characteristics variations: γ<inf>d</inf> = −2 ln(1 − κ<inf>d</inf>)δv<inf>C</inf>. Here κ<inf>d</inf> is diffractive coupling coefficient, which shows the rate of the injection defined as £ = I<inf>d</inf> δ5v<inf>c</inf>. The injection of the field into the following mode predetermines the regime of each mode. Only fundamental mode (j = 0) operates at saturated inversion, the rest operate in the regenerative amplification regime. The injection process forms the distribution of Ej in frequency. The distribution has a characteristic maximum. The position of the maximum is determined by I<inf>d</inf> value and does not depend on time. The main contribution into the average intensity Ī = Σ<inf>j</inf> E²<inf>j</inf> gives a relatively small number of modes, located near the maximum of E²<inf>j</inf>(j) distribution. Under these conditions, the interference of coherent optical fields results in a complex structure of each pulse of mode locking. Changing γ<inf>d</inf> leads to noticeable changes in Ī and the inversion. In this way a variation of the κ<inf>d</inf> value forms the mechanism of Q factor changing. Periodic alteration of the K<inf>d</inf> value provides periodic Q-switch regime of the laser.","PeriodicalId":387984,"journal":{"name":"2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127220483","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}

{"title":"A low-cost, compact OEIC without equalizer for 5Gb/s application","authors":"Rong Wang, Chen Fan, Zhigong Wang","doi":"10.1109/PIERS.2017.8262166","DOIUrl":"https://doi.org/10.1109/PIERS.2017.8262166","url":null,"abstract":"A low-cost, compact 5-Gb/s fully integrated CMOS optical receiver without equalizer, which consists of a Deep Nwell (DNW)-strip spatially-modulated photo detector (SMPD) and a dual negative feedback feed-forward common gate (DNFFCG) differential trans-impedance amplifier (TIA) is presented in this paper. The chip area is 0.5 mm by 0.45 mm. The differential trans-impedance amplifier consumes 17 mW from the 1.6-V supply. Combined with a high performance limiting amplifier, the OEIC without using equalizer can achieve a 5 Gbps very-short-reach OEIC receiver with high power efficiency and lower cost.","PeriodicalId":387984,"journal":{"name":"2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124860992","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}

{"title":"A compact dual-band slot antenna based on Koch fractal snowflake annular ring","authors":"M. Yassen, M. Hussan, H. A. Hammas, H. Al-Saedi, Jawad K. Ali","doi":"10.1109/PIERS.2017.8261826","DOIUrl":"https://doi.org/10.1109/PIERS.2017.8261826","url":null,"abstract":"This paper presents the design of a compact dual-band slot antenna for use in the recently available wireless communication applications. The slot structure of the proposed antenna is based on an annular slot-ring with Koch snowflake fractal geometry of the third iteration. The antenna slot structure has been etched on the ground plane of a substrate with relative permittivity of 4.5 and 1.524 mm thickness. On the other side of the substrate, a 50-Ohm microstrip line has been etched as the antenna feed structure. The proposed antenna has a compact size of (40 × 40 × 1.524) mm3. Simulation results show that the proposed antenna could excite two resonant bands. The lower resonant band extends from (2.38–3.03) GHz while the upper resonant band extends from (4.45–5.06) GHz. This makes the antenna suitable for a wide range of currently available communication services.","PeriodicalId":387984,"journal":{"name":"2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126034508","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}

{"title":"Least condition of the topological derivative for imaging of thin, flat dielectric inhomogeneity","authors":"W. Park","doi":"10.1109/PIERS.2017.8262253","DOIUrl":"https://doi.org/10.1109/PIERS.2017.8262253","url":null,"abstract":"Although the topological derivative based imaging technique has shown its effectiveness for electromagnetic inhomogeneity with small thickness, no theoretical investigation has been performed concerning the least condition of the range of applied incident directions. In this study, we examine the least condition of the range of incident directions for imaging thin, flat dielectric inhomogeneity. Our study is based on the fact that the imaging function can be expressed by an infinite series of Bessel functions of integer order. Simulation results with noisy data have been presented to support our examination.","PeriodicalId":387984,"journal":{"name":"2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126067424","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}

{"title":"Periodical structures and multiscale modelling","authors":"P. Fiala, P. Werner, P. Osmera, E. Gescheidtová, P. Drexler, T. Kríz","doi":"10.1109/PIERS.2017.8262022","DOIUrl":"https://doi.org/10.1109/PIERS.2017.8262022","url":null,"abstract":"The paper discusses a numerical model for more accurate analysis of electro-hydro-dynamic processes at the level of MEMS and NANO-EMS structures. Based on previous examinations of graphene structures [1] and using traditional modeling techniques, the authors employ diverse analyses of relevant limiting parameters to propose a structural analysis facilitating the evaluation of numerical models within the nano and micro dimensions. A simple example is used to demonstrate the properties of the given approach to the current multiscale modeling of structures of matter.","PeriodicalId":387984,"journal":{"name":"2017 Progress In Electromagnetics Research Symposium - Spring (PIERS)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123526481","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}