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Experimental Characterization of Power Transistors for Linearity Optimization 用于线性优化的功率晶体管实验表征
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751433
G. Abib, E. Bergeault, S. Bensmida, B. Huyart
{"title":"Experimental Characterization of Power Transistors for Linearity Optimization","authors":"G. Abib, E. Bergeault, S. Bensmida, B. Huyart","doi":"10.1109/EUMC.2008.4751433","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751433","url":null,"abstract":"In this paper, different techniques are combined in a unique characterization system dedicated for power transistor linearity improvement. Successive optimizations are performed using source-pull/load-pull techniques at the fundamental and base-band frequencies associated with an instantaneous memoryless base-band predistortion procedure. Measurement results performed at 1.575 GHz on a MESFET power transistor biased in class AB for a QPSK modulated signal, show that fundamental frequency source-pull measurements lead to an ACPR variation equal to 3 dB. Moreover, the influence of base-band impedance on ACPR and EVM is found to be 15 dB and 4.5 points, respectively. Finally, instantaneous memoryless base-band predistortion improves ACPR and EVM values by 5 dB and 1 point, respectively.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"5 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":"122121111","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
Electrically Small MEMS Antenna for Wireless Biomedical Microsystems 用于无线生物医学微系统的电小型MEMS天线
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751438
L. Rocha, P. Mendes
{"title":"Electrically Small MEMS Antenna for Wireless Biomedical Microsystems","authors":"L. Rocha, P. Mendes","doi":"10.1109/EUMC.2008.4751438","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751438","url":null,"abstract":"This paper presents an extremely small antenna for wireless biomedical devices. Most of the implantable devices require very small dimensions, requiring the use of microtechnologies to obtain the necessary size reduction. One of the most challenging devices to integrate is the antenna, required if we want to communicate with the device through a wireless link. The proposed antenna uses a MEMS structure to convert the incoming electromagnetic field to a voltage. This antenna allows the reception of signals using a carrier in the kHz range and uses only a chip area of 1.5 times1.5 mm2.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"14 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":"117256256","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: 7
DC-Switchable and Tunable Piezoelectricity in RF Thin-Film BST Capacitors RF薄膜BST电容器的直流可开关和可调谐压电性
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751403
M. Capanu, T. Bernacki, M. Zelner, P. Woo, A. Cervin-Lawry, C. Divita
{"title":"DC-Switchable and Tunable Piezoelectricity in RF Thin-Film BST Capacitors","authors":"M. Capanu, T. Bernacki, M. Zelner, P. Woo, A. Cervin-Lawry, C. Divita","doi":"10.1109/EUMC.2008.4751403","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751403","url":null,"abstract":"Ferroelectric materials such as (Bax Sr1-x) TiO3 (BST) exhibit a non-zero piezoelectric coefficient under a DC field. The piezoelectric coefficient increases from 0 as the applied DC bias increases from 0V. This gives rise to electrostrictive resonance behaviour in capacitors fabricated with these materials. This paper presents the results of high frequency measurements and simulations of induced piezoelectricity for multilayer BST thin film structures under a 10V DC bias. The Mason model and transmission line theory is used as the basis of the simulation and our work extends it to include the effects of other layers in the passivated capacitor device. High-frequency capacitors with 100 nm thick (Ba0.5Sr0.5) TiO3 and Pt electrodes were fabricated on polycrystalline Al2O3 ceramic and Si substrates with an amorphous oxide buffer layer. Correlation between measurements and simulations allowed us to evaluate the piezoelectric coefficient, its switchability and tunability as well as the contribution of the multilayer film structure to the electrostrictive resonance behaviour. The model fits very well with the measurements and can be used to adjust the resonance peaks to the desired frequencies.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"7 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":"129003657","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: 4
Microwave absorbers based on foamed nanocomposites with graded concentration of carbon nanotubes 基于碳纳米管梯度浓度泡沫纳米复合材料的微波吸收剂
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751372
I. Huynen, L. Bednarz, J. Thomassin, C. Pagnoulle, R. Jerome, C. Detrembleur
{"title":"Microwave absorbers based on foamed nanocomposites with graded concentration of carbon nanotubes","authors":"I. Huynen, L. Bednarz, J. Thomassin, C. Pagnoulle, R. Jerome, C. Detrembleur","doi":"10.1109/EUMC.2008.4751372","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751372","url":null,"abstract":"A multilayered foamed nanocomposite with graded concentration of carbon nanotubes is proposed as a novel microwave absorber. The dispersion and foaming process enables to control the gradation in conductivity of each layer. Absorption performances are demonstrated through measurements of reflectivity and shielding effectiveness over the frequency range [8-16 GHz]. An improvement of about 5 dB in reflectivity is observed with respect to a foamed composite having a similar uniform concentration, while in both cases the shielding effectiveness is kept higher than 15 dB.","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":"129007091","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: 27
A 400 MHz - 1600 MHz SiGe MMIC beam-former for the Square Kilometre Array 用于平方公里阵列的400 MHz - 1600 MHz SiGe MMIC波束形成器
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751757
K. Visser, E. van der Wal, M. Ruiter, D. Kant
{"title":"A 400 MHz - 1600 MHz SiGe MMIC beam-former for the Square Kilometre Array","authors":"K. Visser, E. van der Wal, M. Ruiter, D. Kant","doi":"10.1109/EUMC.2008.4751757","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751757","url":null,"abstract":"This paper describes an implementation of a beam former Monolithic Microwave Integrated Circuit (MMIC) for the SKA demonstrator project known as EMBRACE using the SG25H1 Silicon Germanium process of IHP microelectronics. This process is qualified as a high-performance technology with npn-HBTs up to ft/fmax = 180/220 GHz.","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":"114171560","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: 3
Permeameter For The Characterization Of Magnetic Thin Films Up To 15 GHz 用于表征高达15 GHz的磁性薄膜的磁导仪
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751573
F. Hettstedt, U. Schurmann, R. Knochel, E. Quandt
{"title":"Permeameter For The Characterization Of Magnetic Thin Films Up To 15 GHz","authors":"F. Hettstedt, U. Schurmann, R. Knochel, E. Quandt","doi":"10.1109/EUMC.2008.4751573","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751573","url":null,"abstract":"This paper presents a new permeameter for measurement of the complex permeability mu of magnetic thin films up to 15 GHz. The permeameter consists of a strip conductor, which acts as an inductor and is loaded with the magnetic material. The geometry is optimized with respect to sensitivity and self resonance by field simulations using HFSS. A new wideband calibration procedure up to the self resonance frequency of the fixture is also outlined. It utilizes a reference material with known permeability, where the ferromagnetic resonance is shifted by an external magnetic DC field. Frequency dependent calibration factors are introduced. Small residual errors at low frequencies are removed through vibrating sample magnetometer measurements.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"99 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":"121575893","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
Thermally Stable Distributed MEMS Phase Shifter for Airborne and Space Applications 用于机载和空间应用的热稳定分布式MEMS移相器
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751397
M. Fernandez-Bolaños, T. Lisec, P. Dainesi, A. Ionescu
{"title":"Thermally Stable Distributed MEMS Phase Shifter for Airborne and Space Applications","authors":"M. Fernandez-Bolaños, T. Lisec, P. Dainesi, A. Ionescu","doi":"10.1109/EUMC.2008.4751397","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751397","url":null,"abstract":"This paper presents an in-depth study of the design, modelling, circuit parameter extraction and characterization of a distributed MEMS digital microwave phase shifter. Bridge-type digital capacitors periodically loaded on a 5 mm CPW (with an actuation voltage of 22 V) has been fabricated and successfully measured in a wide range of frequencies (1-14 GHZ), achieving a true-time delay of 25 ps. Experimental data are in very good agreement with the equivalent circuit model and high frequency 3D EM simulations for both single switches and phase shifters. These phase shifters are designed for beam steering applications in airborne and space which require operation within large range of temperatures. Therefore, temperature measurements fulfilling the applications requirements have been done in vacuum and in room air from -130degC to 50degC. It is demonstrated that the delay deviation of our phase shifter is 10% (2 ps) at 14 GHz for the full temperature range (DeltaTdeg=180deg).","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"170 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":"124136804","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
Compact Tunable Microstrip Bandpass Filters with Asymmetrical Frequency Response 具有非对称频率响应的紧凑可调谐微带带通滤波器
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751523
Wenxing Tang, Jiasheng Hong, Young‐Hoon Chun
{"title":"Compact Tunable Microstrip Bandpass Filters with Asymmetrical Frequency Response","authors":"Wenxing Tang, Jiasheng Hong, Young‐Hoon Chun","doi":"10.1109/EUMC.2008.4751523","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751523","url":null,"abstract":"A new type of electronically tunable asymmetric frequency response bandpass filter based on dual-mode open-loop resonator is investigated. By employing the unique characteristic of the dual-mode open-loop resonator, that is, whose two operating modes (odd-and even-modes) do not couple to each other, tuning the passband frequency becomes simple with single DC bias circuit. Two designed tunable bandpass filters of this type are demonstrated experimentally, which show more than 10 dB of return loss and less than 3 dB insertion loss over a tuning range of 12% from 0.83 to 0.93 GHz.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"55 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":"127697423","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: 22
Electrically Small Square Loop Antenna with a Capacitive SRR Cover Structure 电容式SRR盖结构的电小型方形环形天线
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751597
Yong-Jin Kim, Jung-han Kim, Hong-min Lee
{"title":"Electrically Small Square Loop Antenna with a Capacitive SRR Cover Structure","authors":"Yong-Jin Kim, Jung-han Kim, Hong-min Lee","doi":"10.1109/EUMC.2008.4751597","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751597","url":null,"abstract":"In this paper, an electrically small square loop antenna with a capacitive SRR cover structure is built and tested. The size of the proposed antenna (ka 0.34) is much smaller than the corresponding Chu limit value. The experimental result shows that the resonant frequency and impedance bandwidth (VSWRles2) are 906 MHz and 5.8 MHz (901.7 - 907.5 MHz) respectively. The proposed antenna has maximum gain of -0.59dBi and radiation efficiency of 42.85% at 906 MHz. Although the proposed antenna has very small size, the measured maximum gain and radiation efficiency of the antenna show good performances. The proposed antenna is efficiently matched without additional matching network and designed by equivalent circuit model. A Teflon substrate (epsivr = 2.2) is used for the antenna fabrication. Therefore it has advantages of low cost, small size, and light weight and will be applied to wireless communication systems where small size antennas are required such as RFID (Radio Frequency Identification).","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"47 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":"128128421","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: 4
High Speed Dynamic Bias Switching Power Amplifier for OFDM Applications 用于OFDM的高速动态偏置开关功率放大器
2008 38th European Microwave Conference Pub Date : 2008-10-01 DOI: 10.1109/EUMC.2008.4751798
JuKyung Cha, Young-Sang Jun, S. Nam
{"title":"High Speed Dynamic Bias Switching Power Amplifier for OFDM Applications","authors":"JuKyung Cha, Young-Sang Jun, S. Nam","doi":"10.1109/EUMC.2008.4751798","DOIUrl":"https://doi.org/10.1109/EUMC.2008.4751798","url":null,"abstract":"An efficiency-enhanced power-amplifier system using dynamic bias switching method is presented. The presented system generates two different voltage sources from one source for drain bias of a RF power amplifier. The drain of the RF power amplifier is biased at low voltage level while the input RF signal is detected to be small. The drain bias is rapidly changed to high voltage level when the input RF signal reaches a certain threshold level. The measured drain bias at VH state is 4.6V with the efficiency of the bias switching system, 49% and at VL is 2.94V with 86%. The measured result shows that the overall efficiency of the proposed RF power amplifier is improved by 62% compared to that of the fixed bias amplifier, when OFDM signal with bandwidth 8.46MHz is applied.","PeriodicalId":308339,"journal":{"name":"2008 38th European Microwave Conference","volume":"16 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":"127912476","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
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