International Journal of Microwave Science and Technology最新文献

Detection of Cracks in Concrete Structure Using Microwave Imaging Technique 利用微波成像技术检测混凝土结构裂缝

International Journal of Microwave Science and Technology Pub Date : 2016-06-19 DOI: 10.1155/2016/3195716

E. A. Jiya, N. S. N. Anwar, M. Abdullah

引用次数: 14

Reconfigurable and Tunable Filtenna for Cognitive LTE Femtocell Base Stations 认知LTE飞蜂窝基站的可重构可调谐滤波器

International Journal of Microwave Science and Technology Pub Date : 2016-06-08 DOI: 10.1155/2016/9460823

Hamza Nachouane, A. Najid, A. Tribak, F. Riouch

{"title":"Reconfigurable and Tunable Filtenna for Cognitive LTE Femtocell Base Stations","authors":"Hamza Nachouane, A. Najid, A. Tribak, F. Riouch","doi":"10.1155/2016/9460823","DOIUrl":"https://doi.org/10.1155/2016/9460823","url":null,"abstract":"A single-port uniplanar antenna with a built-in tunable filter is presented for operation in multiple LTE bands for cognitive femtocell applications. The antenna is based on a monopole microstrip patch fed by coplanar waveguide. The frequency reconfigurability is achieved by using two PIN diodes to couple or decouple a ring slot resonator filter from the antenna feed line. By switching the PIN diodes, the proposed design can operate in either wideband or narrowband modes. When the antenna operates in the narrowband state, two varactor diodes are used to continuously tune the narrowband frequency from 2.55 to 3.2 GHz, while the wideband state is obtained over the 1.35–6.2 GHz band. The diodes and their biasing networks have nearly no severe effect on the antenna characteristics. Prototypes of the proposed structure using ideal and real switches, with and without varactors, are fabricated and tested. Measured and simulated results are in good agreement, thus verifying the good performance of the proposed design. The obtained results show that the proposed antenna is very suitable for cognitive radio applications, in which the wideband mode is used for spectrum sensing and the narrowband mode for transmission at different frequency bands.","PeriodicalId":232251,"journal":{"name":"International Journal of Microwave Science and Technology","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129997971","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: 9

A Frequency Agile Semicircular Slot Antenna For Cognitive Radio System 一种用于认知无线电系统的频率捷变半圆槽天线

International Journal of Microwave Science and Technology Pub Date : 2016-04-28 DOI: 10.1155/2016/2648248

Rajeev Kumar, R. Vijay

引用次数: 13

Ultrawideband Noise Radar Tomography: Principles, Simulation, and Experimental Validation 超宽带噪声雷达层析成像:原理、仿真和实验验证

International Journal of Microwave Science and Technology Pub Date : 2016-04-10 DOI: 10.1155/2016/5787895

H. J. Shin, R. Narayanan, Mark A. Asmuth, M. Rangaswamy

引用次数: 7

Comparative Assessment of GaN as a Microwave Source with Si and SiC for Mixed Mode Operation at Submillimetre Wave Band of Frequency GaN与Si和SiC作为微波源在亚毫米波频段混合模式工作的比较评价

International Journal of Microwave Science and Technology Pub Date : 2016-02-14 DOI: 10.1155/2016/4370345

P. Panda, S. Padhi, G. Dash

{"title":"Comparative Assessment of GaN as a Microwave Source with Si and SiC for Mixed Mode Operation at Submillimetre Wave Band of Frequency","authors":"P. Panda, S. Padhi, G. Dash","doi":"10.1155/2016/4370345","DOIUrl":"https://doi.org/10.1155/2016/4370345","url":null,"abstract":"The potentials of GaN, SiC, and Si for application as microwave sources in mixed tunnelling avalanche transit time mode operation at submillimetre wave (sub-mm wave) frequency around 0.35 terahertz (THz) are investigated using some computer simulation methods. Design criteria to choose width, doping concentration, and area are highlighted. From the results of our simulation we observed that the Si diode produces the least power output of 41 mW followed by the GaN diode with 760 mW and the SiC diode with 2.89 W. In addition, the GaN diode has more noise than the SiC diode (by 5 dB) as well as the Si diode (by 10 dB). The drastically different performance between the GaN and the SiC diode is attributed to the incorporation of disparate carrier velocity in GaN which were not being used by other authors. In spite of the low power and high noise of the GaN compared to the SiC diode, the presence of several peaks in the mean square noise voltage curves and the existence of several minima in the noise measure curves would open a new direction in the design of GaN low-noise ATT diodes capable of multifrequency tuning like a DAR diode.","PeriodicalId":232251,"journal":{"name":"International Journal of Microwave Science and Technology","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121746930","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 Terahertz Controlled Duplex Isolator: Physical Grounds and Numerical Experiment 太赫兹控制双工隔离器:物理基础和数值实验

International Journal of Microwave Science and Technology Pub Date : 2016-01-17 DOI: 10.1155/2016/1468508

K. Vytovtov, S. Zouhdi, R. Dubrovka, V. Hnatushenko

引用次数: 4

Application of Defected Ground Structure to Suppress Out-of-Band Harmonics for WLAN Microstrip Antenna 应用缺陷接地结构抑制 WLAN 微带天线的带外谐波

International Journal of Microwave Science and Technology Pub Date : 2015-12-27 DOI: 10.1155/2015/210608

P. Prajapati

{"title":"Application of Defected Ground Structure to Suppress Out-of-Band Harmonics for WLAN Microstrip Antenna","authors":"P. Prajapati","doi":"10.1155/2015/210608","DOIUrl":"https://doi.org/10.1155/2015/210608","url":null,"abstract":"An application of defected ground structure (DGS) to reduce out-of-band harmonics has been presented. A compact, proximity feed fractal slotted microstrip antenna for wireless local area network (WLAN) applications has been designed. The proposed 3rd iteration reduces antenna size by as compared to rectangular conventional antenna and by introducing H shape DGS, the size of an antenna is further reduced by . The DGS introduces stop band characteristics and suppresses higher harmonics, which are out of the band generated by 1st, 2nd, and 3rd iterations. H shape DGS is etched below the 50 Ω feed line and transmission coefficient parameters are obtained by CST Microwave Studio software. The values of equivalent and model have been extracted using a trial version of the diplexer filter design software. The stop band characteristic of the equivalent model also has been simulated by the Advance Digital System software, which gives almost the same response as compared to the simulation of CST Microwave Studio V. 12. The proposed antenna operates from 2.4 GHz to 2.49 GHz, which covers WLAN band and has a gain of 4.46 dB at 2.45 GHz resonance frequency.","PeriodicalId":232251,"journal":{"name":"International Journal of Microwave Science and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130980945","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: 20

Characterization of NixZn1−xFe2O4 and Permittivity of Solid Material of NiO, ZnO, Fe2O3, and NixZn1−xFe2O4 at Microwave Frequency Using Open Ended Coaxial Probe NixZn1−xFe2O4及NiO、ZnO、Fe2O3和NixZn1−xFe2O4固体材料在微波频率下介电常数的研究

International Journal of Microwave Science and Technology Pub Date : 2015-11-29 DOI: 10.1155/2015/219195

F. Esa, Z. Abbas, F. M. Idris, M. Hashim

{"title":"Characterization of NixZn1−xFe2O4 and Permittivity of Solid Material of NiO, ZnO, Fe2O3, and NixZn1−xFe2O4 at Microwave Frequency Using Open Ended Coaxial Probe","authors":"F. Esa, Z. Abbas, F. M. Idris, M. Hashim","doi":"10.1155/2015/219195","DOIUrl":"https://doi.org/10.1155/2015/219195","url":null,"abstract":"This paper describes a detailed study on the application of an open ended coaxial probe technique to determine the permittivity of in the frequency range between 1 GHz and 10 GHz. The compositions of the spinel ferrite were 0.1, 0.3, 0.5, 0.7, and 0.9. The samples were prepared by 10-hour sintering at 900°C with 4°C/min increment from room temperature. Particles showed phase purity and crystallinity in powder X-ray diffraction (XRD) analysis. Surface morphology measurement of scanning electron microscopy (SEM) was conducted on the plane surfaces of the molded samples which gave information about grain morphology, boundaries, and porosity. The tabulated grain size for all samples was in the range of 62 nm–175 nm. The complex permittivity of Ni-Zn ferrite samples was determined using the Agilent Dielectric Probe Kit 85070B. The probe assumed the samples were nonmagnetic homogeneous materials. The permittivity values also provide insights into the effect of the fractional composition of on the bulk permittivity values . Vector Network Analyzer 8720B (VNA) was connected via coaxial cable to the Agilent Dielectric Probe Kit 85070B.","PeriodicalId":232251,"journal":{"name":"International Journal of Microwave Science and Technology","volume":"352 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134502693","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

Turn Ratio, Substrates’ Permittivity Characterization, and Analysis of Split Ring Resonator Based Antenna 分环谐振器天线的匝比、基片介电常数特性及分析

International Journal of Microwave Science and Technology Pub Date : 2015-11-03 DOI: 10.1155/2015/453710

S. S. Olokede, Nurul A. Mohd-Razif, N. Mahyuddin

引用次数: 3

Design of UWB Planar Monopole Antennas with Etched Spiral Slot on the Patch for Multiple Band-Notched Characteristics 多带陷波特性的超宽带平面单极天线的刻蚀螺旋槽设计

International Journal of Microwave Science and Technology Pub Date : 2015-10-20 DOI: 10.1155/2015/303215

S. Das, D. Mitra, S. Chaudhuri

引用次数: 18