Pub Date : 2017-09-01DOI: 10.1109/EMCT.2017.8090383
O. Ozgun
This paper presents a study of the Characteristic Basis Finite Element Method (CBFEM), which is an advanced numerical method that can be used in EMC applications. The CBFEM is a non-iterative domain decomposition technique employing characteristic basis functions, and it provides considerable reduction in matrix size and convenient parallelization, both of which make use of direct solvers in a memory- and time-efficient manner. The approach is compared with the conventional FEM in terms of both accuracy and the computational performance by means of various numerical simulations for solving waveguide and cavity problems having discontinuities and arbitrary objects inside.
{"title":"Advanced finite element analysis for EMC engineering","authors":"O. Ozgun","doi":"10.1109/EMCT.2017.8090383","DOIUrl":"https://doi.org/10.1109/EMCT.2017.8090383","url":null,"abstract":"This paper presents a study of the Characteristic Basis Finite Element Method (CBFEM), which is an advanced numerical method that can be used in EMC applications. The CBFEM is a non-iterative domain decomposition technique employing characteristic basis functions, and it provides considerable reduction in matrix size and convenient parallelization, both of which make use of direct solvers in a memory- and time-efficient manner. The approach is compared with the conventional FEM in terms of both accuracy and the computational performance by means of various numerical simulations for solving waveguide and cavity problems having discontinuities and arbitrary objects inside.","PeriodicalId":104929,"journal":{"name":"2017 IV International Electromagnetic Compatibility Conference (EMC Turkiye)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115256060","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}
Pub Date : 2017-09-01DOI: 10.1109/EMCT.2017.8090382
İlker Yağlıdere
The experiments and theoretical considerations about several cable configurations grounded at both ends are described. The theory of magnetic coupling and shielding is reviewed. In the experiment, a constant magnetic field is generated at 4 frequencies and 10 different cable configurations are tested at each frequency. 40 measurement results are presented and they are compared with 6 measurements in the literature. The results point out that cables grounded at both ends exhibit high susceptibility to radiated electromagnetic interference (EMI) due to the ground loop and it is quite difficult to construct a good cable configuration in this mode. All double-grounded cable configurations have been found to provide poor protection performance against magnetic fields, in the frequency range between 100 Hz and 50 kHz. However, some configurations utilizing magnetic shields made of mumetal are found to be advantageous. Furthermore, cables with a nonmagnetic shield grounded at both ends are shown to provide some protection above the shield cutoff frequency and the results are discussed.
{"title":"Analysis of low-frequency magnetic coupling in cables grounded at both ends","authors":"İlker Yağlıdere","doi":"10.1109/EMCT.2017.8090382","DOIUrl":"https://doi.org/10.1109/EMCT.2017.8090382","url":null,"abstract":"The experiments and theoretical considerations about several cable configurations grounded at both ends are described. The theory of magnetic coupling and shielding is reviewed. In the experiment, a constant magnetic field is generated at 4 frequencies and 10 different cable configurations are tested at each frequency. 40 measurement results are presented and they are compared with 6 measurements in the literature. The results point out that cables grounded at both ends exhibit high susceptibility to radiated electromagnetic interference (EMI) due to the ground loop and it is quite difficult to construct a good cable configuration in this mode. All double-grounded cable configurations have been found to provide poor protection performance against magnetic fields, in the frequency range between 100 Hz and 50 kHz. However, some configurations utilizing magnetic shields made of mumetal are found to be advantageous. Furthermore, cables with a nonmagnetic shield grounded at both ends are shown to provide some protection above the shield cutoff frequency and the results are discussed.","PeriodicalId":104929,"journal":{"name":"2017 IV International Electromagnetic Compatibility Conference (EMC Turkiye)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126803478","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}
Pub Date : 2017-09-01DOI: 10.1109/EMCT.2017.8090367
Agah Oktay Ertay, S. Simsek
The main idea of this study is to investigate the small signal gain analysis of the helix type Traveling Wave Tube's (TWT's). Dispersion equation of the TWT is discussed and the behavior of propagation constants of the helix TWT structure is expressed when beam-wave interaction occurs. All possible waves or modes which play important role in the amplification process are considered. The effects of loss due to interaction circuit, space charge effects and beam velocity variations are taken into account when solution of the dispersion equation and TWT gain characteristics are carried out. Fundamental aspects of the TWT small signal gain analysis with Pierce parameters such as b (velocity parameter), QC (space charge parameter), d (cold tube circuit loss) are examined. Some significant figures are obtained to express the behavior of the gain with respect to Pierce parameters. It is noted that Pierce small signal theory gives important information to investigate the gain characterization of the TWT considering natural effects of beam velocity, circuit loss and beam-wave interaction.
{"title":"On the assessment study of small signal gain analysis of helix type traveling wave tube with pierce parameters","authors":"Agah Oktay Ertay, S. Simsek","doi":"10.1109/EMCT.2017.8090367","DOIUrl":"https://doi.org/10.1109/EMCT.2017.8090367","url":null,"abstract":"The main idea of this study is to investigate the small signal gain analysis of the helix type Traveling Wave Tube's (TWT's). Dispersion equation of the TWT is discussed and the behavior of propagation constants of the helix TWT structure is expressed when beam-wave interaction occurs. All possible waves or modes which play important role in the amplification process are considered. The effects of loss due to interaction circuit, space charge effects and beam velocity variations are taken into account when solution of the dispersion equation and TWT gain characteristics are carried out. Fundamental aspects of the TWT small signal gain analysis with Pierce parameters such as b (velocity parameter), QC (space charge parameter), d (cold tube circuit loss) are examined. Some significant figures are obtained to express the behavior of the gain with respect to Pierce parameters. It is noted that Pierce small signal theory gives important information to investigate the gain characterization of the TWT considering natural effects of beam velocity, circuit loss and beam-wave interaction.","PeriodicalId":104929,"journal":{"name":"2017 IV International Electromagnetic Compatibility Conference (EMC Turkiye)","volume":"2013 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128086542","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}
Pub Date : 2017-09-01DOI: 10.1109/EMCT.2017.8090355
H. S. Efendioglu, Mehmet Yabuloğlu, Hamza Ozer
Emanations from the information technology equipment may contain classified information being processed by the device. Shielding is one of the important techniques used for TEMPEST precaution and shielded window films can be viewed as the specific intent to prevent classified information processed within a building/area from being intercepted. The purpose of this work is to investigate the effectiveness of shielded window films in communication security. For this purpose, experiments are conducted at the windows of a test room. The results are discussed and effectiveness of utilizing the shielded window films in facilities for TEMPEST are analyzed in detail.
{"title":"Effectiveness of shielded window films used for electromagnetic leakages in communication security","authors":"H. S. Efendioglu, Mehmet Yabuloğlu, Hamza Ozer","doi":"10.1109/EMCT.2017.8090355","DOIUrl":"https://doi.org/10.1109/EMCT.2017.8090355","url":null,"abstract":"Emanations from the information technology equipment may contain classified information being processed by the device. Shielding is one of the important techniques used for TEMPEST precaution and shielded window films can be viewed as the specific intent to prevent classified information processed within a building/area from being intercepted. The purpose of this work is to investigate the effectiveness of shielded window films in communication security. For this purpose, experiments are conducted at the windows of a test room. The results are discussed and effectiveness of utilizing the shielded window films in facilities for TEMPEST are analyzed in detail.","PeriodicalId":104929,"journal":{"name":"2017 IV International Electromagnetic Compatibility Conference (EMC Turkiye)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133257375","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}
In this paper, the effect of the antenna height (constant or variable) was analyzed during inter-laboratory comparisons (ILCs) for radiated emission (RE) test. The electric field strength that is radiated from an electronic device is measured on RE test. The measured values are can be differential depending on some variables. Measurement distance between receiving antenna and product to be tested must be constant during RE tests of ILC. The Equipment under Test (EUTs) height also has to be same. The antenna can be constant or can be movable. This situation affects the measurements majorly. The ILCs can be success or failed because of the varying parameters. EN 17025 “General requirements for the competence of testing and calibration laboratories” requires that test and calibration laboratories continuously shall prove proficiency in performing measurements as part of assuring the quality of their results and monitor the validity of performed tests. Comparison tests between test setup in different laboratories are important from the point of test accuracy, validity, repeatability. In the same way, these ILCs are the requirement of laboratory accreditation. Accredited test laboratories shall participate to ILCs according to the requirements of the EN 17043 “Conformity assessment — General requirements for proficiency testing standard”. ILCs should be performed more carefully and more detailed for primary critical tests that have also complex setup such as RE test. In this study, the effect of the measurement height on the ILCs for RE test was examined. The results also were evaluated based on the |En| scores.
{"title":"Analysis of effects of variable parameters on inter-laboratory comparisons for radiated emission test","authors":"Sezgin Hilavin, Emre Alan, Faik Alan, Samet Develi","doi":"10.1109/EMCT.2017.8090365","DOIUrl":"https://doi.org/10.1109/EMCT.2017.8090365","url":null,"abstract":"In this paper, the effect of the antenna height (constant or variable) was analyzed during inter-laboratory comparisons (ILCs) for radiated emission (RE) test. The electric field strength that is radiated from an electronic device is measured on RE test. The measured values are can be differential depending on some variables. Measurement distance between receiving antenna and product to be tested must be constant during RE tests of ILC. The Equipment under Test (EUTs) height also has to be same. The antenna can be constant or can be movable. This situation affects the measurements majorly. The ILCs can be success or failed because of the varying parameters. EN 17025 “General requirements for the competence of testing and calibration laboratories” requires that test and calibration laboratories continuously shall prove proficiency in performing measurements as part of assuring the quality of their results and monitor the validity of performed tests. Comparison tests between test setup in different laboratories are important from the point of test accuracy, validity, repeatability. In the same way, these ILCs are the requirement of laboratory accreditation. Accredited test laboratories shall participate to ILCs according to the requirements of the EN 17043 “Conformity assessment — General requirements for proficiency testing standard”. ILCs should be performed more carefully and more detailed for primary critical tests that have also complex setup such as RE test. In this study, the effect of the measurement height on the ILCs for RE test was examined. The results also were evaluated based on the |En| scores.","PeriodicalId":104929,"journal":{"name":"2017 IV International Electromagnetic Compatibility Conference (EMC Turkiye)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133037376","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}
Pub Date : 2017-09-01DOI: 10.1109/EMCT.2017.8090354
Veyis Solak, H. S. Efendioglu, B. Colak, M. Garip
Crosstalk is an important phenomenon for both EMC (electromagnetic compatibility) and TEMPEST. Crosstalk prevention requirements for cables can be found in many different standards. This work aims to analyze the crosstalk effects on power cables. For this purpose, initially the theoretical background of crosstalk between cables will be discussed. Then, simulations that are performed will be analyzed. Later, the details of the experiments will be discussed for different set-ups with changing parameters such as distance between cables, cable lengths, and cable types. Finally, experimental results will be compared with both simulations and theory.
{"title":"Analysis and simulation of cable crosstalk","authors":"Veyis Solak, H. S. Efendioglu, B. Colak, M. Garip","doi":"10.1109/EMCT.2017.8090354","DOIUrl":"https://doi.org/10.1109/EMCT.2017.8090354","url":null,"abstract":"Crosstalk is an important phenomenon for both EMC (electromagnetic compatibility) and TEMPEST. Crosstalk prevention requirements for cables can be found in many different standards. This work aims to analyze the crosstalk effects on power cables. For this purpose, initially the theoretical background of crosstalk between cables will be discussed. Then, simulations that are performed will be analyzed. Later, the details of the experiments will be discussed for different set-ups with changing parameters such as distance between cables, cable lengths, and cable types. Finally, experimental results will be compared with both simulations and theory.","PeriodicalId":104929,"journal":{"name":"2017 IV International Electromagnetic Compatibility Conference (EMC Turkiye)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123664278","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}
Pub Date : 2017-09-01DOI: 10.1109/EMCT.2017.8090371
Hoda Dadashzadeh, Alireza E. Khosroshahi, S. Hosseini
This paper presents the optimal controller design for an improved battery charger structure which can be supplied from a photovoltaic power system. The transfer characteristic of the presented converter is the same as a buck/boost converter. Therefore, even in extreme conditions, the presented converter has the ability to extract the maximum power from the photovoltaic power system and charge the battery efficiently. Other advantages of the presented converter such as continuous smooth input current also make it suitable for photovoltaic generation systems. The presented converter consists of two charging modes which develop the efficiency of charging; pulsating output current and constant voltage. A predictive controller is designed for the presented converter which assures the optimal operation of the system. The controller chooses the best operating conditions for the photovoltaic power system. Simulation results are provided to validate the proper operation of the controller.
{"title":"A digital predictive controller for a SEPIC-based battery charger in photovoltaic power systems","authors":"Hoda Dadashzadeh, Alireza E. Khosroshahi, S. Hosseini","doi":"10.1109/EMCT.2017.8090371","DOIUrl":"https://doi.org/10.1109/EMCT.2017.8090371","url":null,"abstract":"This paper presents the optimal controller design for an improved battery charger structure which can be supplied from a photovoltaic power system. The transfer characteristic of the presented converter is the same as a buck/boost converter. Therefore, even in extreme conditions, the presented converter has the ability to extract the maximum power from the photovoltaic power system and charge the battery efficiently. Other advantages of the presented converter such as continuous smooth input current also make it suitable for photovoltaic generation systems. The presented converter consists of two charging modes which develop the efficiency of charging; pulsating output current and constant voltage. A predictive controller is designed for the presented converter which assures the optimal operation of the system. The controller chooses the best operating conditions for the photovoltaic power system. Simulation results are provided to validate the proper operation of the controller.","PeriodicalId":104929,"journal":{"name":"2017 IV International Electromagnetic Compatibility Conference (EMC Turkiye)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128423651","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}
Pub Date : 2017-09-01DOI: 10.1109/EMCT.2017.8090379
I. Küçük, Büşra Timur, Zafer Tanç, S. Demir
This paper presents design and simulation results of the cylindrical axial virtual cathode oscillator which is frequently used to damage electronic equipment by generating High Power Microwaves (HPM). Simulations are performed in MAGIC Tool Suite which uses FDTD-PIC algorithm to solve particle beam and field interactions. During the design procedure, AK Gap is changed from 5 mm to 12 mm and the scaling law is verified by simulation results. 9 mm AK gap values are selected as the most suitable one when output power and frequency of radiated field are taken into consideration. Further investigations are made by using 9 mm AK value in simulation environment. Formation of the virtual cathode is confirmed by Pz vs. z phase space diagram. The mean of applied input voltage value and input power value are found as 87.76 kV and 246 MW, respectively. The peak power and the average power for the generated microwave at the output are also 6.3 MW and 1.8 MW. Thus, power conversion efficiency for both peak and average output power are obtained as 2.56% and 0.73%, respectively. Frequency of the radial and longitudinal components of the produced electric field at the output is 2.92 GHz. Waveguide mode at 2.92 GHz is inferred from radial field distributions of fields and the propagating mode is found as TM01 at 2.92 GHz, which verifies our prediction.
{"title":"Design studies of axial vircator for high power microwave generation","authors":"I. Küçük, Büşra Timur, Zafer Tanç, S. Demir","doi":"10.1109/EMCT.2017.8090379","DOIUrl":"https://doi.org/10.1109/EMCT.2017.8090379","url":null,"abstract":"This paper presents design and simulation results of the cylindrical axial virtual cathode oscillator which is frequently used to damage electronic equipment by generating High Power Microwaves (HPM). Simulations are performed in MAGIC Tool Suite which uses FDTD-PIC algorithm to solve particle beam and field interactions. During the design procedure, AK Gap is changed from 5 mm to 12 mm and the scaling law is verified by simulation results. 9 mm AK gap values are selected as the most suitable one when output power and frequency of radiated field are taken into consideration. Further investigations are made by using 9 mm AK value in simulation environment. Formation of the virtual cathode is confirmed by Pz vs. z phase space diagram. The mean of applied input voltage value and input power value are found as 87.76 kV and 246 MW, respectively. The peak power and the average power for the generated microwave at the output are also 6.3 MW and 1.8 MW. Thus, power conversion efficiency for both peak and average output power are obtained as 2.56% and 0.73%, respectively. Frequency of the radial and longitudinal components of the produced electric field at the output is 2.92 GHz. Waveguide mode at 2.92 GHz is inferred from radial field distributions of fields and the propagating mode is found as TM01 at 2.92 GHz, which verifies our prediction.","PeriodicalId":104929,"journal":{"name":"2017 IV International Electromagnetic Compatibility Conference (EMC Turkiye)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122004189","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}
Pub Date : 2017-09-01DOI: 10.1109/EMCT.2017.8090352
H. Ibili, B. Karaosmanoğlu, Ö. Ergül
We consider three-dimensional metamaterials involving split-ring resonators (SRRs) that are produced by using low-cost inkjet printing. Following their three-dimensional computational simulations, sensitivity analysis is applied on SRR arrays in order to evaluate their tolerance to various fabrication errors. We use silver-based inks in standard commercial printers in order to fabricate SRRs and their arrays. Measurements demonstrate the feasibility of fabricating very low-cost three-dimensional metamaterials using simple inkjet printing.
{"title":"Design and fabrication of low-cost inkjet-printed metamaterials","authors":"H. Ibili, B. Karaosmanoğlu, Ö. Ergül","doi":"10.1109/EMCT.2017.8090352","DOIUrl":"https://doi.org/10.1109/EMCT.2017.8090352","url":null,"abstract":"We consider three-dimensional metamaterials involving split-ring resonators (SRRs) that are produced by using low-cost inkjet printing. Following their three-dimensional computational simulations, sensitivity analysis is applied on SRR arrays in order to evaluate their tolerance to various fabrication errors. We use silver-based inks in standard commercial printers in order to fabricate SRRs and their arrays. Measurements demonstrate the feasibility of fabricating very low-cost three-dimensional metamaterials using simple inkjet printing.","PeriodicalId":104929,"journal":{"name":"2017 IV International Electromagnetic Compatibility Conference (EMC Turkiye)","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133469527","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}
Pub Date : 2017-09-01DOI: 10.1109/EMCT.2017.8090359
Mehmet İzmir, Agah Oktay Ertay, S. Simsek
The purpose of this investigation is to present a Ku-Band Helix Traveling Wave Tube Amplifier (TWTA) design and simulation procedure with considering initial design assumptions. The design process which consists of four critical steps is stated. Firstly, required input parameters such as dc beam current (Io), dc beam voltage (Vo) and frequency band of operation are chosen. Determination of the design objectives such as gain and output power constitutes the second stage of the design procedure. For this purpose, overall gain in considered frequency range is specified as over 20 dB. The output power is aimed to 100 W. To obtain design objectives mentioned in the second step, it is necessary to have optimum helix slow wave structure (SWS) design parameters such as helix pitch, radius and pitch angle. Therefore, the optimized design parameters of the SWS are determined by using Eigen Mode Solver (EMS) (cold (beam absent) analysis) of Computer Simulation Technology (CST) Microwave Studio (MWS) for acquiring the beam-wave synchronization. Particle in Cell (PIC) simulation (hot (beam present) analysis) is carried out by assuming the uniform electron beam flow. The length of the interaction structure of the designed TWT is nearly 110 mm and all design objectives are nearly achieved as it is expected. Many crucial figures related to gain, power and beam wave interaction are depicted with detailed explanations. Furthermore, the design limitations of this proposed design due to assumptions are also clarified.
{"title":"Design and simulation study of Helix Traveling Wave Amplifier for Ku-Band applications","authors":"Mehmet İzmir, Agah Oktay Ertay, S. Simsek","doi":"10.1109/EMCT.2017.8090359","DOIUrl":"https://doi.org/10.1109/EMCT.2017.8090359","url":null,"abstract":"The purpose of this investigation is to present a Ku-Band Helix Traveling Wave Tube Amplifier (TWTA) design and simulation procedure with considering initial design assumptions. The design process which consists of four critical steps is stated. Firstly, required input parameters such as dc beam current (Io), dc beam voltage (Vo) and frequency band of operation are chosen. Determination of the design objectives such as gain and output power constitutes the second stage of the design procedure. For this purpose, overall gain in considered frequency range is specified as over 20 dB. The output power is aimed to 100 W. To obtain design objectives mentioned in the second step, it is necessary to have optimum helix slow wave structure (SWS) design parameters such as helix pitch, radius and pitch angle. Therefore, the optimized design parameters of the SWS are determined by using Eigen Mode Solver (EMS) (cold (beam absent) analysis) of Computer Simulation Technology (CST) Microwave Studio (MWS) for acquiring the beam-wave synchronization. Particle in Cell (PIC) simulation (hot (beam present) analysis) is carried out by assuming the uniform electron beam flow. The length of the interaction structure of the designed TWT is nearly 110 mm and all design objectives are nearly achieved as it is expected. Many crucial figures related to gain, power and beam wave interaction are depicted with detailed explanations. Furthermore, the design limitations of this proposed design due to assumptions are also clarified.","PeriodicalId":104929,"journal":{"name":"2017 IV International Electromagnetic Compatibility Conference (EMC Turkiye)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124549261","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：