Pub Date : 2017-11-01DOI: 10.1109/PIERS-FALL.2017.8293196
Yang Yang, Jin Xu, H. Yin, Wenfei Bo, Jingchao Tang, Jialu Ma, Jie Xie, Zhanliang Wang, Y. Gong
In order to significantly improve the resolution of biological imaging, a water-immersed (the antenna is placed in the pure water) ultra-wide band (UWB) microstrip antenna is proposed in this paper. The aim of this paper is to determine the suitable wavelength of the interrogating radiation in the medium and to reduce the big reflection of the incident energy at the interface between the target and the medium surrounding the target. In this way, the frequency of 2.45 GHz is selected due to the compromise between spatial resolution and loss of signal, and the medium is chosen as water because of its relative permittivity close to the biological tissues. The design of the linear gradient impedance-matched patch antenna is proposed to match the antenna and the coaxial transmission line of 50 ohms. The simulation results are presented that the fixed percentage bandwidth of this antenna is about 0.923 (1.75 ∼ 4.8 GHz) and the 3 dB gain degree range is from −30° to 30° except the null at the center from −6° to 6°, which are both good enough to satisfy the requirements for biological imaging system.
{"title":"Study of a water-immersed ultra-wide band microstrip patch antenna","authors":"Yang Yang, Jin Xu, H. Yin, Wenfei Bo, Jingchao Tang, Jialu Ma, Jie Xie, Zhanliang Wang, Y. Gong","doi":"10.1109/PIERS-FALL.2017.8293196","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293196","url":null,"abstract":"In order to significantly improve the resolution of biological imaging, a water-immersed (the antenna is placed in the pure water) ultra-wide band (UWB) microstrip antenna is proposed in this paper. The aim of this paper is to determine the suitable wavelength of the interrogating radiation in the medium and to reduce the big reflection of the incident energy at the interface between the target and the medium surrounding the target. In this way, the frequency of 2.45 GHz is selected due to the compromise between spatial resolution and loss of signal, and the medium is chosen as water because of its relative permittivity close to the biological tissues. The design of the linear gradient impedance-matched patch antenna is proposed to match the antenna and the coaxial transmission line of 50 ohms. The simulation results are presented that the fixed percentage bandwidth of this antenna is about 0.923 (1.75 ∼ 4.8 GHz) and the 3 dB gain degree range is from −30° to 30° except the null at the center from −6° to 6°, which are both good enough to satisfy the requirements for biological imaging system.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"24 1","pages":"538-542"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82437840","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 : 2017-11-01DOI: 10.1109/PIERS-FALL.2017.8293123
Fanping Shi, T. Jiang, Yingsong Li
A fork-like dual-band dipole antenna with an inverted U-shaped parasitic element (IUSPE) is proposed and its performance is analyzed in detail. The proposed antenna is realized by using two-overlapped U-shaped (TOUS) patch and an IUSPE, which is fed by the coaxial line. The proposed antenna is built and numerically simulated by the HFSS. The simulated results show that the optimized antenna can operate at 3.3–3.69 GHz for WiMAX and 5.15–5.25 GHz for WLAN communication applications with respect to S11 < −10 dB. Additionally, the proposed antenna gives a good impedance matching characteristic at the desired operating frequency bands and has omnidirectional radiation patterns, making it suitable for multi-band wireless communication applications.
{"title":"A fork-like dual-band antenna with an inverted U-shaped parasitic element for WLAN and WIMAX applications","authors":"Fanping Shi, T. Jiang, Yingsong Li","doi":"10.1109/PIERS-FALL.2017.8293123","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293123","url":null,"abstract":"A fork-like dual-band dipole antenna with an inverted U-shaped parasitic element (IUSPE) is proposed and its performance is analyzed in detail. The proposed antenna is realized by using two-overlapped U-shaped (TOUS) patch and an IUSPE, which is fed by the coaxial line. The proposed antenna is built and numerically simulated by the HFSS. The simulated results show that the optimized antenna can operate at 3.3–3.69 GHz for WiMAX and 5.15–5.25 GHz for WLAN communication applications with respect to S11 < −10 dB. Additionally, the proposed antenna gives a good impedance matching characteristic at the desired operating frequency bands and has omnidirectional radiation patterns, making it suitable for multi-band wireless communication applications.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"17 1 1","pages":"124-127"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82586541","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 : 2017-11-01DOI: 10.1109/PIERS-FALL.2017.8293174
Fulong Jing, Weijian Si, Yu Wang
Estimating the coefficients of a noisy polynomial phase signal is important in fields including radar, biology and radio communications. In this paper, we consider a novel algorithm for estimating the high-order polynomial-phase signal (PPS). The proposed method, which is called hybrid LvHAF, combines the frequency domain method which is called Lv's Distribution (LVD) and the time domain method which is called high order ambiguity function (HAF) to improve the estimation performance. The HAF-based approach provides a simple order-recursive algorithm for estimating the polynomial-phase coefficients. Due to low complexity, the HAF algorithm is widely used in the field of radar. The LVD is a novel algorithm for estimating the LFM signal, which is simple and only requires a two-dimensional Fourier transform of a parametric scaled symmetric instantaneous autocorrelation function (PSIAF). It can be easily implemented by using the complex multiplications and fast Fourier transforms (FFT) based on the scaling principle. The LVD is searching free and without introducing any nonphysical attributes such as order or rotation angle. It only introduces a time delay into the time-lag instantaneous autocorrelation function and rescales the time axis to eliminate the effects of linear frequency migration for the LFM components on the time-frequency plane. The hybrid LvHAF is following two stage approaches. First, the phase differentiation is applied on the PPSs to produce a linear frequency signal (LFM). Second, the parameters of LFM are estimated by the LVD. The main significance of the LVD is to convert a 1-D LFM into a 2-D single-frequency signal. Through simulations and analyses, we verify the effectiveness of the Hybrid LvHAF algorithm.
{"title":"Parameter estimation of polynomial-phase signal using the hybrid LvHAF","authors":"Fulong Jing, Weijian Si, Yu Wang","doi":"10.1109/PIERS-FALL.2017.8293174","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293174","url":null,"abstract":"Estimating the coefficients of a noisy polynomial phase signal is important in fields including radar, biology and radio communications. In this paper, we consider a novel algorithm for estimating the high-order polynomial-phase signal (PPS). The proposed method, which is called hybrid LvHAF, combines the frequency domain method which is called Lv's Distribution (LVD) and the time domain method which is called high order ambiguity function (HAF) to improve the estimation performance. The HAF-based approach provides a simple order-recursive algorithm for estimating the polynomial-phase coefficients. Due to low complexity, the HAF algorithm is widely used in the field of radar. The LVD is a novel algorithm for estimating the LFM signal, which is simple and only requires a two-dimensional Fourier transform of a parametric scaled symmetric instantaneous autocorrelation function (PSIAF). It can be easily implemented by using the complex multiplications and fast Fourier transforms (FFT) based on the scaling principle. The LVD is searching free and without introducing any nonphysical attributes such as order or rotation angle. It only introduces a time delay into the time-lag instantaneous autocorrelation function and rescales the time axis to eliminate the effects of linear frequency migration for the LFM components on the time-frequency plane. The hybrid LvHAF is following two stage approaches. First, the phase differentiation is applied on the PPSs to produce a linear frequency signal (LFM). Second, the parameters of LFM are estimated by the LVD. The main significance of the LVD is to convert a 1-D LFM into a 2-D single-frequency signal. Through simulations and analyses, we verify the effectiveness of the Hybrid LvHAF algorithm.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"20 1","pages":"417-426"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81943074","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 : 2017-11-01DOI: 10.1109/PIERS-FALL.2017.8293640
Luis Diaz, J. Vrba, D. Vrba
Several studies have reported considerable differences in dielectric properties between healthy and pathological tissues. In addition, in the area of electromagnetic field applications in medicine, discussions about the correctness of dielectric properties of biological tissues measured ex vivo (the most common method of measurement), for example due to lower blood content, are taking place. By using the inherent electromagnetic working principle of magnetic resonance (MR) systems, changes in wave propagation can be used to extract values of dielectric properties of target tissues from MR images. This method thus represents a method for noninvasive measurement of dielectric properties of biological tissues in Vivo. The results might be used for detection and classification of illness. It has been show in literature that both magnitude and phase of the MR RF waves can be determined using standard MR imaging sequences. By using the resulting magnitude and phase of RF waves dielectric properties can be determined by simply using the Helmholtz equation. In this study we confirm such reports through numerical simulations using high-resolution anatomical head model and a model of bird-cage coil. Furthermore, a simplified head phantom mimicking dielectric properties of strokes and brain tissues was designed and manufactured and information from real MR scans was processed. As it will be shown in this work, this process works well for data obtained via numerical simulations but it is not as straightforward, for the images coming from the MR system. There, additional processing in order to compensate for the presence of noise and de-phasing is crucial.
{"title":"Extraction of electrical properties of strokes from magnetic resonance scans — Testing on simplified head phantoms","authors":"Luis Diaz, J. Vrba, D. Vrba","doi":"10.1109/PIERS-FALL.2017.8293640","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293640","url":null,"abstract":"Several studies have reported considerable differences in dielectric properties between healthy and pathological tissues. In addition, in the area of electromagnetic field applications in medicine, discussions about the correctness of dielectric properties of biological tissues measured ex vivo (the most common method of measurement), for example due to lower blood content, are taking place. By using the inherent electromagnetic working principle of magnetic resonance (MR) systems, changes in wave propagation can be used to extract values of dielectric properties of target tissues from MR images. This method thus represents a method for noninvasive measurement of dielectric properties of biological tissues in Vivo. The results might be used for detection and classification of illness. It has been show in literature that both magnitude and phase of the MR RF waves can be determined using standard MR imaging sequences. By using the resulting magnitude and phase of RF waves dielectric properties can be determined by simply using the Helmholtz equation. In this study we confirm such reports through numerical simulations using high-resolution anatomical head model and a model of bird-cage coil. Furthermore, a simplified head phantom mimicking dielectric properties of strokes and brain tissues was designed and manufactured and information from real MR scans was processed. As it will be shown in this work, this process works well for data obtained via numerical simulations but it is not as straightforward, for the images coming from the MR system. There, additional processing in order to compensate for the presence of noise and de-phasing is crucial.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"3 1","pages":"2961-2965"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82408985","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 : 2017-11-01DOI: 10.1109/PIERS-FALL.2017.8293596
N. Narampanawe, K. See, Sooriya Bandara Rathnayaka, Jie Zhang, Kangrong Li, E. Chua, W. Goh
This paper describes the fabrication and measurement of a flexible magnetic core inductive probe. The probe's copper windings are printed on a flexible polyimide substrate layers with a flexible magnetic core sandwiched in between. The fabricated probe can be wrapped around an electrical cable for injecting and receiving purposes.
{"title":"An empirical characterization of a flexible current probe for in-circuit impedance measurement","authors":"N. Narampanawe, K. See, Sooriya Bandara Rathnayaka, Jie Zhang, Kangrong Li, E. Chua, W. Goh","doi":"10.1109/PIERS-FALL.2017.8293596","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293596","url":null,"abstract":"This paper describes the fabrication and measurement of a flexible magnetic core inductive probe. The probe's copper windings are printed on a flexible polyimide substrate layers with a flexible magnetic core sandwiched in between. The fabricated probe can be wrapped around an electrical cable for injecting and receiving purposes.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"64 1","pages":"2703-2706"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76338269","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 : 2017-11-01DOI: 10.1109/PIERS-FALL.2017.8293130
R. Vinaykumar, Jyoti, J. Bera
In the recent decade, ferrites which possess low losses, good permeability, and permittivity, has been proposed as materials for microwave device applications. In this article, La-Co substituted Ba2−xLaxZn2Fe12-xCoxO22 (Zn2Y-type) hexagonal ferrite was synthesized through conventional solid state reaction route with composition; x equals to 0.0, 0.1, 0.3 and 0.5. The phase formation behavior and changes in crystal structure parameters of the ferrite with substitution were investigated using X-ray diffraction (XRD) analysis. Accurate lattice parameters were evaluated through Rietveld refinement of XRD pattern. The XRD, as well as SEM-EDS analysis, showed that there was the formation of lanthanum iron oxide phase at the grain boundary of the ferrite phase. The densities of the substituted ferrites were lower than the pure ferrite due to the formation of La-ferrite phase. The microstructural analysis showed the decrease in grain growth with an increase in the substitution. Both the permittivity and permeability were decreased with the substitution due to the decreased densification. In substituted ferrite, both the permittivity and permeability were in the range 11 to 18 and they were stable in the frequency range 1 to 500 MHz. The ferrites with x = 0.1 and 0.3 composition reveal to be very promising candidates for the design of antennas with good impedance matching to free space and miniaturization factor. A ferrite antenna was designed and antenna parameters were simulated.
{"title":"Electromagnetic properties of La-Co substituted Zn2Y type hexagonal ferrite for microwave device applications","authors":"R. Vinaykumar, Jyoti, J. Bera","doi":"10.1109/PIERS-FALL.2017.8293130","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293130","url":null,"abstract":"In the recent decade, ferrites which possess low losses, good permeability, and permittivity, has been proposed as materials for microwave device applications. In this article, La-Co substituted Ba2−xLaxZn2Fe12-xCoxO22 (Zn2Y-type) hexagonal ferrite was synthesized through conventional solid state reaction route with composition; x equals to 0.0, 0.1, 0.3 and 0.5. The phase formation behavior and changes in crystal structure parameters of the ferrite with substitution were investigated using X-ray diffraction (XRD) analysis. Accurate lattice parameters were evaluated through Rietveld refinement of XRD pattern. The XRD, as well as SEM-EDS analysis, showed that there was the formation of lanthanum iron oxide phase at the grain boundary of the ferrite phase. The densities of the substituted ferrites were lower than the pure ferrite due to the formation of La-ferrite phase. The microstructural analysis showed the decrease in grain growth with an increase in the substitution. Both the permittivity and permeability were decreased with the substitution due to the decreased densification. In substituted ferrite, both the permittivity and permeability were in the range 11 to 18 and they were stable in the frequency range 1 to 500 MHz. The ferrites with x = 0.1 and 0.3 composition reveal to be very promising candidates for the design of antennas with good impedance matching to free space and miniaturization factor. A ferrite antenna was designed and antenna parameters were simulated.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"46 1","pages":"157-163"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87884817","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 : 2017-11-01DOI: 10.1109/PIERS-FALL.2017.8293222
A. Joshi, Lokesh Kumar Verma, R. Singhal
The paper presents a probe fed slotted hexagonal patch antenna and emphasizes on antenna performance after suppression of a spurious radiation. To suppress the spurious radiation two complementary split ring resonators (CSRRs) are inserted in the reduced ground plane. Based on simulated antenna performance characteristics such as reflection coefficient, impedance and far field radiation pattern of the CSRRs embedded antenna have been analyzed and compared with the antenna without CSRRs. Equivalent circuit model of the antenna with CSRRs has been incorporated to explain the effect of CSRRs on antenna scattering and impedance performance. Due to the suppression of dual resonance in the antenna with CSRRs, narrower bandwidth (∼ 220 MHz) is observed along with reduced backside radiation in the antenna with CSRRs when compared with the antenna without CSRR. The proposed antenna can be utilized in diverse applications within (U-NII-2C) WLAN band.
提出了一种探头馈电的开槽六边形贴片天线，重点研究了天线在抑制杂散辐射后的性能。为了抑制杂散辐射，在减少的地平面中插入两个互补的裂环谐振器。在模拟天线性能的基础上，分析了csrs嵌入式天线的反射系数、阻抗和远场辐射方向图等特性，并与无csrs的天线进行了比较。采用等效电路模型对天线的散射和阻抗性能进行了分析。由于在有CSRR的天线中抑制了双共振，与没有CSRR的天线相比，有CSRR的天线中观察到更窄的带宽(~ 220 MHz)以及减少的背面辐射。该天线可用于(u - ni - 2c) WLAN频段内的各种应用。
{"title":"Spurious radiation suppression in slotted hexagonal antenna using complementary split ring resonators","authors":"A. Joshi, Lokesh Kumar Verma, R. Singhal","doi":"10.1109/PIERS-FALL.2017.8293222","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293222","url":null,"abstract":"The paper presents a probe fed slotted hexagonal patch antenna and emphasizes on antenna performance after suppression of a spurious radiation. To suppress the spurious radiation two complementary split ring resonators (CSRRs) are inserted in the reduced ground plane. Based on simulated antenna performance characteristics such as reflection coefficient, impedance and far field radiation pattern of the CSRRs embedded antenna have been analyzed and compared with the antenna without CSRRs. Equivalent circuit model of the antenna with CSRRs has been incorporated to explain the effect of CSRRs on antenna scattering and impedance performance. Due to the suppression of dual resonance in the antenna with CSRRs, narrower bandwidth (∼ 220 MHz) is observed along with reduced backside radiation in the antenna with CSRRs when compared with the antenna without CSRR. The proposed antenna can be utilized in diverse applications within (U-NII-2C) WLAN band.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"8 1","pages":"683-688"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86940686","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 : 2017-11-01DOI: 10.1109/PIERS-FALL.2017.8293639
Haiyan Jin, Yuliang Zhou, Y. Huang, S. Ding
The general condition to achieve negative group delay (NGD) transmission in electromagnetic coupled resonators is investigated. Different from previous studies, this work focuses on deriving the relationship between the NGD and the energy storage capability of the resonator, which is usually denoted by the quality (Q) factor. In this derivation, the Q factor is divided into two parts, including the external (Qe) and internal quality (Qi) factors. By analyzing the equivalent circuit of the coupled resonator, the relationship between group delay and Q factor is extracted, as the group delay is related to ratio of Qe and Qi. Furthermore, the group delay is with a sudden change from positive to negative as Qe is beyond the catastrophe point. Finally, frequency and time domain experimental validation is provided to prove the efficiency of derived condition.
{"title":"General condition to achieve negative group delay transmission in coupled resonator structure","authors":"Haiyan Jin, Yuliang Zhou, Y. Huang, S. Ding","doi":"10.1109/PIERS-FALL.2017.8293639","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293639","url":null,"abstract":"The general condition to achieve negative group delay (NGD) transmission in electromagnetic coupled resonators is investigated. Different from previous studies, this work focuses on deriving the relationship between the NGD and the energy storage capability of the resonator, which is usually denoted by the quality (Q) factor. In this derivation, the Q factor is divided into two parts, including the external (Qe) and internal quality (Qi) factors. By analyzing the equivalent circuit of the coupled resonator, the relationship between group delay and Q factor is extracted, as the group delay is related to ratio of Qe and Qi. Furthermore, the group delay is with a sudden change from positive to negative as Qe is beyond the catastrophe point. Finally, frequency and time domain experimental validation is provided to prove the efficiency of derived condition.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"31 1","pages":"2956-2960"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87063058","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 : 2017-11-01DOI: 10.1109/PIERS-FALL.2017.8293395
T. Kríz, P. Drexler, R. Kadlec
The article discusses the results obtained from the numerical modelling of planar resonator arrays designed for GHz frequencies. To achieve a response within the GHz region of the electromagnetic field, we examined the dot-like structures of the applied metal-based resonators. In the given context, circular resonators in particular appear to be promising as regards simplified fabrication via the micro-structuring technology.
{"title":"A numerical analysis of a periodic resonant structure at GHz frequencies","authors":"T. Kríz, P. Drexler, R. Kadlec","doi":"10.1109/PIERS-FALL.2017.8293395","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293395","url":null,"abstract":"The article discusses the results obtained from the numerical modelling of planar resonator arrays designed for GHz frequencies. To achieve a response within the GHz region of the electromagnetic field, we examined the dot-like structures of the applied metal-based resonators. In the given context, circular resonators in particular appear to be promising as regards simplified fabrication via the micro-structuring technology.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"5 1","pages":"1630-1634"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88116692","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 : 2017-11-01DOI: 10.1109/PIERS-FALL.2017.8293511
S. Yeung, Chao‐Fu Wang
Optimizing the impedance or return loss bandwidth is important in antenna design. It ensures that the major portion of energy inputted into the antenna is not reflected back to the power source that could waste energy or cause damage to the circuit. The reflection depends on the antenna design, while the feed location is one of the important factor. Therefore, the feed location should be properly selected to optimize the impedance bandwidth. In this work, the impedance bandwidth analysis with respect to different feed locations using characteristic mode (CM) analysis will be presented. This technique can be applied to the structure with a metallic plane on top of a metallic ground separated by a thin air gap. In this approach, the CMs of the structure over a frequency range will be calculated first. The impedance of the feed port over the frequency range will then be calculated from superposition of contributions from individual CM. Finally, the impedance bandwidth could be evaluated by the input impedance. The CMs of a structure are only needed to be calculated once, while the modes can be used to synthesis the impedance bandwidth when the antenna is fed from any possible locations of the structure. Two bandwidth criterions will be focused: the largest single band bandwidth and the largest overall multiband band. The first criterion evaluate the largest continuous impedance bandwidth over a frequency range, while the second criterion evaluates the number of frequency points with good impedance matching condition over a wide frequency range. To demonstrate that the approach can be working on various shapes, the CM impedance bandwidth analysis has been tested on an aircraft wing shape as well as a ship platform shape. The topic is important to the antenna design community because it helps the antenna design to select the optimal feed point which can maximize the impedance bandwidth or to utilize more operational bands.
{"title":"Characteristic mode based impedance bandwidth analysis for optimal feed location","authors":"S. Yeung, Chao‐Fu Wang","doi":"10.1109/PIERS-FALL.2017.8293511","DOIUrl":"https://doi.org/10.1109/PIERS-FALL.2017.8293511","url":null,"abstract":"Optimizing the impedance or return loss bandwidth is important in antenna design. It ensures that the major portion of energy inputted into the antenna is not reflected back to the power source that could waste energy or cause damage to the circuit. The reflection depends on the antenna design, while the feed location is one of the important factor. Therefore, the feed location should be properly selected to optimize the impedance bandwidth. In this work, the impedance bandwidth analysis with respect to different feed locations using characteristic mode (CM) analysis will be presented. This technique can be applied to the structure with a metallic plane on top of a metallic ground separated by a thin air gap. In this approach, the CMs of the structure over a frequency range will be calculated first. The impedance of the feed port over the frequency range will then be calculated from superposition of contributions from individual CM. Finally, the impedance bandwidth could be evaluated by the input impedance. The CMs of a structure are only needed to be calculated once, while the modes can be used to synthesis the impedance bandwidth when the antenna is fed from any possible locations of the structure. Two bandwidth criterions will be focused: the largest single band bandwidth and the largest overall multiband band. The first criterion evaluate the largest continuous impedance bandwidth over a frequency range, while the second criterion evaluates the number of frequency points with good impedance matching condition over a wide frequency range. To demonstrate that the approach can be working on various shapes, the CM impedance bandwidth analysis has been tested on an aircraft wing shape as well as a ship platform shape. The topic is important to the antenna design community because it helps the antenna design to select the optimal feed point which can maximize the impedance bandwidth or to utilize more operational bands.","PeriodicalId":39469,"journal":{"name":"Advances in Engineering Education","volume":"71 1","pages":"2237-2240"},"PeriodicalIF":0.0,"publicationDate":"2017-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86378894","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}
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