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Logarithmic Slots Antennas Using Substrate Integrated Waveguide 基于基片集成波导的对数槽天线
International Journal of Microwave Science and Technology Pub Date : 2015-10-19 DOI: 10.1155/2015/629797
Jahnavi Kachhia, Amit V. Patel, Alpesh Vala, Romil Patel, Keyur K. Mahant
{"title":"Logarithmic Slots Antennas Using Substrate Integrated Waveguide","authors":"Jahnavi Kachhia, Amit V. Patel, Alpesh Vala, Romil Patel, Keyur K. Mahant","doi":"10.1155/2015/629797","DOIUrl":"https://doi.org/10.1155/2015/629797","url":null,"abstract":"This paper represents new generation of slotted antennas for satellite application where the loss can be compensated in terms of power or gain of antenna. First option is very crucial because it totally depends on size of satellite so we have proposed the high gain antenna creating number of rectangular, trapezoidal, and I shape slots in logarithm size in Substrate Integrated Waveguide (SIW) structure. The structure consists of an array of various shape slots antenna designed to operate in C and X band applications. The basic structures have been designed over a RT duroid substrate with dielectric constant of 2.2 and with a thickness of 0.508 mm. Multiple slots array and shape of slot effects have been studied and analyzed using HFSS (High Frequency Structure Simulator). The designs have been supported with its return loss, gain plot, VSWR, and radiation pattern characteristics to validate multiband operation. All the proposed antennas give gain more than 9 dB and return loss better than −10 dB. However, the proposed structures have been very sensitive to their physical dimensions.","PeriodicalId":232251,"journal":{"name":"International Journal of Microwave Science and Technology","volume":"73 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130393147","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: 13
Design of a Novel Ultrawide Stopband Lowpass Filter Using a DMS-DGS Technique for Radar Applications 基于DMS-DGS技术的雷达超宽阻带低通滤波器设计
International Journal of Microwave Science and Technology Pub Date : 2015-10-15 DOI: 10.1155/2015/101602
A. Boutejdar, A. Ibrahim, E. Burte
{"title":"Design of a Novel Ultrawide Stopband Lowpass Filter Using a DMS-DGS Technique for Radar Applications","authors":"A. Boutejdar, A. Ibrahim, E. Burte","doi":"10.1155/2015/101602","DOIUrl":"https://doi.org/10.1155/2015/101602","url":null,"abstract":"A novel wide stopband (WSB) low pass filter based on combination of defected ground structure (DGS), defected microstrip structure (DMS), and compensated microstrip capacitors is proposed. Their excellent defected characteristics are verified through simulation and measurements. Additionally to a sharp cutoff, the structure exhibits simple design and fabrication, very low insertion loss in the pass band of 0.3 dB and it achieves a wide rejection bandwidth with overall 20 dB attenuation from 1.5 GHz up to 8.3 GHz. The compact low pass structure occupies an area of (0.40 × 0.24) where = 148 mm is the waveguide length at the cut-off frequency 1.1 GHz. Comparison between measured and simulated results confirms the validity of the proposed method. Such filter topologies are utilized in many areas of communications systems and microwave technology because of their several benefits such as small losses, wide reject band, and high compactness.","PeriodicalId":232251,"journal":{"name":"International Journal of Microwave Science and Technology","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133539135","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: 17
An Iterative Approach to Improve Images of Multiple Targets and Targets with Layered or Continuous Profile 一种改进多目标图像和分层或连续目标图像的迭代方法
International Journal of Microwave Science and Technology Pub Date : 2015-09-27 DOI: 10.1155/2015/376374
Yu-Hsin Kuo, Jean‐Fu Kiang
{"title":"An Iterative Approach to Improve Images of Multiple Targets and Targets with Layered or Continuous Profile","authors":"Yu-Hsin Kuo, Jean‐Fu Kiang","doi":"10.1155/2015/376374","DOIUrl":"https://doi.org/10.1155/2015/376374","url":null,"abstract":"An iterative approach, based on the linear sampling method (LSM) and the contrast source inversion (CSI) method, is proposed to improve the recovered images of multiple targets and targets with layered or continuous profile, including shape and distribution of electric properties. The difficulties in dealing with large targets or high contrast are partly overcome with this approach. Typical targets studied in the literatures are chosen for simulations and comparison.","PeriodicalId":232251,"journal":{"name":"International Journal of Microwave Science and Technology","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122517379","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 Notched UWB Filter Using Stepped Impedance Stub Loaded Microstrip Resonator and Spurlines 采用阶跃阻抗短段负载微带谐振器和杂散线的新型陷波超宽带滤波器
International Journal of Microwave Science and Technology Pub Date : 2015-09-17 DOI: 10.1155/2015/939521
Ramkumar Uikey, Ramanand Sagar Sangam, Kakumanu Prasadu, R. S. Kshetrimayum
{"title":"Novel Notched UWB Filter Using Stepped Impedance Stub Loaded Microstrip Resonator and Spurlines","authors":"Ramkumar Uikey, Ramanand Sagar Sangam, Kakumanu Prasadu, R. S. Kshetrimayum","doi":"10.1155/2015/939521","DOIUrl":"https://doi.org/10.1155/2015/939521","url":null,"abstract":"This paper presents a novel ultrawideband (UWB) bandpass filter using stepped impedance stub loaded microstrip resonator (SISLMR). The proposed resonator is so formed to allow its four resonant frequencies in the UWB passband, which extends from 3.1 GHz to 10.6 GHz. Moreover, two spurline sections are employed to create a sharp notched-band filter for suppressing the signals of 5 GHz WLAN devices. Experimental results of the fabricated filters are in good agreement with the HFSS simulations and validate the design.","PeriodicalId":232251,"journal":{"name":"International Journal of Microwave Science and Technology","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116906029","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: 10
Implementation of a Cross-Spectrum FFT Analyzer for a Phase-Noise Test System in a Low-Cost FPGA 相位噪声测试系统的跨频谱FFT分析仪在低成本FPGA上的实现
International Journal of Microwave Science and Technology Pub Date : 2015-09-17 DOI: 10.1155/2015/757591
P. Fleischmann, H. Mathis, J. Kucera, Stefan Dahinden
{"title":"Implementation of a Cross-Spectrum FFT Analyzer for a Phase-Noise Test System in a Low-Cost FPGA","authors":"P. Fleischmann, H. Mathis, J. Kucera, Stefan Dahinden","doi":"10.1155/2015/757591","DOIUrl":"https://doi.org/10.1155/2015/757591","url":null,"abstract":"The cross-correlation method allows phase-noise measurements of high-quality devices with very low noise levels, using reference sources with higher noise levels than the device under test. To implement this method, a phase-noise analyzer needs to compute the cross-spectral density, that is, the Fourier transform of the cross-correlation, of two time series over a wide frequency range, from fractions of Hz to tens of MHz. Furthermore, the analyzer requires a high dynamic range to accommodate the phase noise of high-quality oscillators that may fall off by more than 100 dB from close-in noise to the noise floor at large frequency offsets. This paper describes the efficient implementation of a cross-spectrum analyzer in a low-cost FPGA, as part of a modern phase-noise analyzer with very fast measurement time.","PeriodicalId":232251,"journal":{"name":"International Journal of Microwave Science and Technology","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123048070","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: 5
Negative Group Delay Circuit Based on Microwave Recursive Filters 基于微波递归滤波器的负群延迟电路
International Journal of Microwave Science and Technology Pub Date : 2015-08-26 DOI: 10.1155/2015/646029
Mohammad Ashraf Ali, C. Wu
{"title":"Negative Group Delay Circuit Based on Microwave Recursive Filters","authors":"Mohammad Ashraf Ali, C. Wu","doi":"10.1155/2015/646029","DOIUrl":"https://doi.org/10.1155/2015/646029","url":null,"abstract":"This work presents a novel approach to design a maximally flat negative group delay (NGD) circuit based on microwave recursive filters. The proposed NGD circuit is realized by cascading stages of quarter-wavelength stepped-impedance transformer. It is shown that the given circuit can be designed to have any prescribed group delay by changing the characteristic impedance of the quarter-wave transformers (QWTs) cascaded with each other. The proposed approach provides a systematic method to synthesize NGD of arbitrary amount without including any discrete lumped component. For various prescribed NGD, the characteristic impedance of QWT has been tabulated for two and three stages of the circuit. The widths and lengths of microstrip transmission lines can be obtained from characteristic impedance and the frequency of operation of the transmission line. The results are verified in both simulation and measurement, showing a good agreement.","PeriodicalId":232251,"journal":{"name":"International Journal of Microwave Science and Technology","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127857520","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
Design of Miniaturized Multiband Filters Using Zero Order Resonators for WLAN Applications 用于WLAN应用的零阶谐振器小型化多带滤波器设计
International Journal of Microwave Science and Technology Pub Date : 2015-03-09 DOI: 10.1155/2015/345326
Maryam Shafiee, M. A. C. Zadeh, H. Oraizi
{"title":"Design of Miniaturized Multiband Filters Using Zero Order Resonators for WLAN Applications","authors":"Maryam Shafiee, M. A. C. Zadeh, H. Oraizi","doi":"10.1155/2015/345326","DOIUrl":"https://doi.org/10.1155/2015/345326","url":null,"abstract":"The objective of this paper is to design miniaturized narrow- and dual-band filters for WLAN application using zero order resonators by the method of least squares. The miniaturization of the narrow-band filter is up to 70% and that of the dual-band filter is up to 64% compared to the available models in the literature. Two prototype models of the narrow-band and dual-band filters are fabricated and measured, which verify the proposed structure for the filter and its design by the presented method, using an equivalent circuit model.","PeriodicalId":232251,"journal":{"name":"International Journal of Microwave Science and Technology","volume":"2015 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130588791","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
The Spiral Coaxial Cable 螺旋同轴电缆
International Journal of Microwave Science and Technology Pub Date : 2015-02-26 DOI: 10.1155/2015/630131
I. Fabbri
{"title":"The Spiral Coaxial Cable","authors":"I. Fabbri","doi":"10.1155/2015/630131","DOIUrl":"https://doi.org/10.1155/2015/630131","url":null,"abstract":"A new concept of metal spiral coaxial cable is introduced. The solution to\u0000Maxwell’s equations for the fundamental propagating TEM eigenmode, using a\u0000generalization of the Schwarz-Christoffel conformal mapping of the spiral transverse\u0000section, is provided together with the analysis of the impedances and the\u0000Poynting vector of the line. The new cable may find application as a medium for\u0000telecommunication and networking or in the sector of the Microwave Photonics. \u0000A spiral plasmonic coaxial cable could be used to propagate subwavelength surface\u0000plasmon polaritons at optical frequencies. Furthermore, according to the present model, the myelinated nerves can be considered natural examples of spiral coaxial cables. This study suggests that a malformation of the Peters angle, which determines the power of the neural signal in the TEM mode, causes higher/lower power to be transmitted in the neural networks\u0000with respect to the natural level. The formulas of the myelin sheaths thickness, the\u0000diameter of the axon, and the spiral factor of the lipid bilayers, which are mathematically\u0000related to the impedances of the spiral coaxial line, can make it easier to analyze the neural line impedance mismatches and the signal disconnections typical of the neurodegenerative diseases.","PeriodicalId":232251,"journal":{"name":"International Journal of Microwave Science and Technology","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131008720","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: 6
An Effective Math Model for Eliminating Interior Resonance Problems of EM Scattering 消除电磁散射内部共振问题的有效数学模型
International Journal of Microwave Science and Technology Pub Date : 2015-01-31 DOI: 10.1155/2015/724702
Zhang Yunfeng, Zhou Zhongshan, Sun Zhi-guo, Wang Rong-zhu, Chen Zehuang
{"title":"An Effective Math Model for Eliminating Interior Resonance Problems of EM Scattering","authors":"Zhang Yunfeng, Zhou Zhongshan, Sun Zhi-guo, Wang Rong-zhu, Chen Zehuang","doi":"10.1155/2015/724702","DOIUrl":"https://doi.org/10.1155/2015/724702","url":null,"abstract":"It is well-known that if an -field integral equation or an -field integral equation is applied alone in analysis of EM scattering from a conducting body, the solution to the equation will be either nonunique or unstable at the vicinity of a certain interior frequency. An effective math model is presented here, providing an easy way to deal with this situation. At the interior resonant frequencies, the surface current density is divided into two parts: an induced surface current caused by the incident field and a resonance surface current associated with the interior resonance mode. In this paper, the presented model, based on electric field integral equation and orthogonal modal theory, is used here to filter out resonant mode; therefore, unique and stable solution will be obtained. The proposed method possesses the merits of clarity in concept and simplicity in computation. A good agreement is achieved between the calculated results and those obtained by other methods in both 2D and 3D EM scattering.","PeriodicalId":232251,"journal":{"name":"International Journal of Microwave Science and Technology","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116995688","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
Quad-Band Bowtie Antenna Design for Wireless Communication System Using an Accurate Equivalent Circuit Model 基于精确等效电路模型的无线通信系统四波段领结天线设计
International Journal of Microwave Science and Technology Pub Date : 2015-01-22 DOI: 10.1155/2015/637607
M. Moulay, M. Abri, H. Badaoui
{"title":"Quad-Band Bowtie Antenna Design for Wireless Communication System Using an Accurate Equivalent Circuit Model","authors":"M. Moulay, M. Abri, H. Badaoui","doi":"10.1155/2015/637607","DOIUrl":"https://doi.org/10.1155/2015/637607","url":null,"abstract":"A novel configuration of quad-band bowtie antenna suitable for wireless application is proposed based on accurate equivalent circuit model. The simple configuration and low profile nature of the proposed antenna lead to easy multifrequency operation. The proposed antenna is designed to satisfy specific bandwidth specifications for current communication systems including the Bluetooth (frequency range 2.4–2.485 GHz) and bands of the Unlicensed National Information Infrastructure (U-NII) low band (frequency range 5.15–5.35 GHz) and U-NII mid band (frequency range 5.47–5.725 GHz) and used for mobile WiMAX (frequency range 3.3–3.6 GHz). To validate the proposed equivalent circuit model, the simulation results are compared with those obtained by the moments method of Momentum software, the finite integration technique of CST Microwave studio, and the finite element method of HFSS software. An excellent agreement is achieved for all the designed antennas. The analysis of the simulated results confirms the successful design of quad-band bowtie antenna.","PeriodicalId":232251,"journal":{"name":"International Journal of Microwave Science and Technology","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126167442","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: 8
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