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2008 38th European Microwave Conference最新文献

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Fast Post-Production SAR Evaluation System through a comparative E-Fields extraction procedure 通过比较e场提取程序的快速后期SAR评价系统
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751679
S. Boucher, C. Person, F. Le Pennec, R. Butet, G. Toutain, Y. Toutain, V. Vigneras, E. Hamon
{"title":"Fast Post-Production SAR Evaluation System through a comparative E-Fields extraction procedure","authors":"S. Boucher, C. Person, F. Le Pennec, R. Butet, G. Toutain, Y. Toutain, V. Vigneras, E. Hamon","doi":"10.1109/EUMC.2008.4751679","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751679","url":null,"abstract":"We investigate on the design of a fast SAR post-production evaluation system, enabling individual testing of mobile phones on a production line, under affordable time (a few seconds) through a comparative E-fields extraction procedure and mapping. In this paper, we focus on the design and optimization of the multi-probes sensor as well as the measurement system dimensioning.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121923686","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
An Inductorless CMOS 0.1-1GHz Automatic Gain Control Circuit 一种无电感CMOS 0.1-1GHz自动增益控制电路
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751487
Hangue Park, Sungho Lee, S. Nam
{"title":"An Inductorless CMOS 0.1-1GHz Automatic Gain Control Circuit","authors":"Hangue Park, Sungho Lee, S. Nam","doi":"10.1109/EUMC.2008.4751487","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751487","url":null,"abstract":"This paper presents an inductorless 0.1-1 GHz automatic gain control (AGC) circuit comprised of a variable gain amplifier (VGA), power detector (PD), and comparator. The VGA has a gain control range of -28~23 dB with a 1 GHz 3-dB gain bandwidth using a cascode amplifier with negative capacitance. The PD shows an input power range of -30~20 dBm using an improved unbalanced source coupled pair, which incorporates an output differential amplifier and sink current steering. The AGC circuit produces constant output power for an input power range of -48 dBm~8 dBm over 0.1~1 GHz without an inductor. The overall current consumption is 7.7 mA under 1.5 V supply. The prototype is fabricated with a 0.18-mum standard CMOS technology.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117221648","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
Accuracy Improvement of Cavity Model Effective Patch Dimensions using a Single Full-Wave Iteration 利用单次全波迭代提高空腔模型有效斑块尺寸精度
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751606
J. Theeuwes, H. Visser, M. V. van Beurden, G.J.N. Doodeman
{"title":"Accuracy Improvement of Cavity Model Effective Patch Dimensions using a Single Full-Wave Iteration","authors":"J. Theeuwes, H. Visser, M. V. van Beurden, G.J.N. Doodeman","doi":"10.1109/EUMC.2008.4751606","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751606","url":null,"abstract":"An accuracy improvement procedure for microstrip patch antenna design is presented. The classical cavity model of a patch antenna is discussed with emphasis on the fringe fields and the compensation for these fringe fields in the form of effective patch dimensions. The effective patch dimensions are improved using a single full-wave simulation, drastically increasing accuracy at the cost of only a small increase in computation time. Using the input impedance of the patch antenna determined via a full-wave simulator, effective patch dimensions are adjusted for each single mode, matching the cavity model results to the full-wave results. It is found that adjustment of non-resonant modes cause a shift in amplitude of the input impedance and a adjustment of a resonant mode results in a shift in frequency. The error in predicted impedance decreases from 75% to 5%. An example is given where an exotic input impedance is required, to match the antenna directly to a nonlinear system. This shows that this method results in fast, efficient, reliable and optimal microstrip patch antenna design.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124068249","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
On the Optimization of Biasing Conditions in a Digitally-Linearized Power Amplifier 数字线性化功率放大器偏置条件的优化研究
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751515
N. Safari, M. Olavsbråten, T. Roste
{"title":"On the Optimization of Biasing Conditions in a Digitally-Linearized Power Amplifier","authors":"N. Safari, M. Olavsbråten, T. Roste","doi":"10.1109/EUMC.2008.4751515","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751515","url":null,"abstract":"Changing the class of operation in a power amplifier (PA) affects the linearity and the efficiency of the PA. In this paper, the linearization performance and the efficiency enhancement of a Digital Predistorter (DPD) in a transmitter is evaluated with different PA classes. The digital predistorter is implemented in real-time on a Digital Signal Processor (DSP). The PA under test is a 2-stage 2-watt amplifier used in mobile terminals in Inmarsat Broadband Global Area Network (BGAN) systems. The gate bias of the PA is tunable for changing the biasing conditions. It is shown that by driving the PA into class B, we increase the memory effects and therefore reduce the effectiveness of memoryless predistortion. It was also shown that using a memoryless digital predistorter and a PA biased near class AB operation, an efficiency of about 41% is achievable while the BGAN system requirements are met.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124680799","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
Time Domain Dosimetry in Layered Media 层状介质的时域剂量测定
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751391
J. E. Page, J. Esteban
{"title":"Time Domain Dosimetry in Layered Media","authors":"J. E. Page, J. Esteban","doi":"10.1109/EUMC.2008.4751391","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751391","url":null,"abstract":"The rigorous solution of the interaction of amplitude-modulated plane waves with planar and spherical stratified obstacles formed by lossy dispersive dielectrics is presented. Some particular cases of interest for the study of the interaction of pulsed fields and biological tissue phantoms are considered. The problem of the energy deposition is presented including some discussion about the use of the absorption rate concept.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"603 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124748814","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
Designing, Fabrication and Characterization of Power Amplifiers Based on 10-Watt SiC MESFET & GaN HEMT at Microwave Frequencies 微波频率下基于10瓦SiC MESFET和GaN HEMT的功率放大器的设计、制造和表征
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751484
S. Azam, R. Jonsson, Q. Wahab
{"title":"Designing, Fabrication and Characterization of Power Amplifiers Based on 10-Watt SiC MESFET & GaN HEMT at Microwave Frequencies","authors":"S. Azam, R. Jonsson, Q. Wahab","doi":"10.1109/EUMC.2008.4751484","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751484","url":null,"abstract":"This paper describes the design, fabrication and measurement of two single-stage class-AB power amplifiers covering the frequency band from 0.7-1.8 GHz using a SiC MESFET and a GaN HEMT. The measured maximum output power for the SiC amplifier at Vd = 48 V was 41.3 dBm (~13.7 W), with a PAE of 32% and a power gain above 10 dB. At a drain bias of Vd= 66 V at 700 MHz the Pmax was 42.2 dBm (~16.6 W) with a PAE of 34.4%. The measured results for GaN amplifier are; maximum output power at Vd = 48 V is 40 dBm (~10 W), with a PAE of 34% and a power gain above 10 dB. The results for SiC amplifier are better than for GaN amplifier for the same 10-W transistor.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124861101","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: 11
New High Directivity Coupler Design Using Feed-forward Compensation Technique 采用前馈补偿技术的新型高指向性耦合器设计
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751420
S. Bensmida, F. Ghannouchi
{"title":"New High Directivity Coupler Design Using Feed-forward Compensation Technique","authors":"S. Bensmida, F. Ghannouchi","doi":"10.1109/EUMC.2008.4751420","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751420","url":null,"abstract":"In this paper, an original high directivity directional coupler is presented. The proposed structure consists of a dual-directional coupler connected at its coupled terminations to a feed-forward compensation circuit. The compensation circuit is used to increase the coupler isolation factor of the obtained directional coupler. The directivity of a commercial dual-directional coupler has been improved by 40 dB using the proposed method.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129349202","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
Using vertical and horizontal multipath models in radar simulations 垂直和水平多径模式在雷达模拟中的应用
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751617
A. Ephrath
{"title":"Using vertical and horizontal multipath models in radar simulations","authors":"A. Ephrath","doi":"10.1109/EUMC.2008.4751617","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751617","url":null,"abstract":"This paper describes models for vertical and horizontal multipath effects, for use with radar simulations. The multipath effect takes place in radar scenarios close to the ground, when the direct ray waveform is interfered with forward reflections from surfaces near the radar or the target. The simplest and well known case is the ground multipath. Here the effect of buildings and walls perpendicular to the ground is also considered, and the total effect of both ground and walls multipath is accounted for. The models here use the image method, well known in mirror optics as well as in radar reflections, for computations. The use of this method is straight forward and well explained for the use of multipath phenomena, both vertical and horizontal, in simulations of radar scenarios. It is shown how to use multipath effects in the analysis of radar performance such as detection (received power) and monopulse angle measurement errors.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129615141","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
Anti-collision Tags for Backscatter Sensor Networks 后向散射传感器网络的防碰撞标签
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751417
A. Bletsas, S. Siachalou, J. Sahalos
{"title":"Anti-collision Tags for Backscatter Sensor Networks","authors":"A. Bletsas, S. Siachalou, J. Sahalos","doi":"10.1109/EUMC.2008.4751417","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751417","url":null,"abstract":"This work analytically quantifies and attempts to alleviate the collision induced by a number of tags that operate via backscatter communication, i.e. modulate the reflection of a common carrier transmitted by a central hub. For omni hub antenna, it is shown that acceptable anti-collision performance can be engineered only when appropriate modulation at each tag is employed. When a beamforming hub antenna with moderate main lobe width and side lobe level (SLL) is instead used, the aggregate communication bandwidth is significantly reduced, or equivalently, the aggregate number of tags is amplified. Analytical results apply to general forms of backscatter communication, potentially useful in classic RFID systems.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129829526","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
A CPW-fed Triple Band Monopole Antenna for WiMAX/WLAN Applications 用于WiMAX/WLAN应用的cpw馈电三波段单极天线
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751598
D. D. Krishna, M. Gopikrishna, C. Aanandan
{"title":"A CPW-fed Triple Band Monopole Antenna for WiMAX/WLAN Applications","authors":"D. D. Krishna, M. Gopikrishna, C. Aanandan","doi":"10.1109/EUMC.2008.4751598","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751598","url":null,"abstract":"A CPW-fed planar monopole antenna for triple band operation is presented. The antenna consists of an elliptical radiating patch with a curved ground plane with embedded slots. When two narrow slots are introduced on a wideband elliptical monopole antenna (2.2-7 GHz), two bands are rejected without affecting the antenna properties at the rest of the operating frequencies. By properly choosing the length and location of the slots, a triple band antenna design is achieved. Impedance and radiation characteristics of the antenna are studied and results indicate that it is suitable for the 2.5-2.69 GHz, 3.4-3.69 GHz, and 5.25-5.85 GHz WiMAX applications and also the 2.4-2.484 GHz, 5.15-5.35 GHz, and 5.725-5.825 GHz WLAN applications. The antenna exhibits omnidirectional radiation coverage with its gain significantly reduced at the notched frequency bands.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"195 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122372183","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: 30
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