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A widely nonlinear approach to compensate impairments in I/Q modulators 一种补偿I/Q调制器损伤的广泛非线性方法
2015 European Microwave Conference (EuMC) Pub Date : 2015-12-03 DOI: 10.1109/EUMC.2015.7345811
C. Crespo-Cadenas, M. J. Madero-Ayora, J. Reina-Tosina, J. A. Becerra-González
{"title":"A widely nonlinear approach to compensate impairments in I/Q modulators","authors":"C. Crespo-Cadenas, M. J. Madero-Ayora, J. Reina-Tosina, J. A. Becerra-González","doi":"10.1109/EUMC.2015.7345811","DOIUrl":"https://doi.org/10.1109/EUMC.2015.7345811","url":null,"abstract":"A novel approach to model impairments in I/Q modulators is presented. The proposal is based on the use of double Volterra series for the I and Q branches. The new model has been shaped as a digital predistorter that can be applied to the compensation of I/Q imbalance, and it has been experimentally validated on a commercial I/Q modulator with superimposed artificial impairments. Measurement results with LTE test signals are compared with other approaches and confirm that the proposed method effectively accomplishes the reduction of carrier leakage, spectral regrowth, and in-band distortion. Performance metrics are within the state-of-the-art, but nearly halving the coefficients of the reference method.","PeriodicalId":350086,"journal":{"name":"2015 European Microwave Conference (EuMC)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126621967","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
Frequency and polarization selectivity of graphene strip gratings 石墨烯带状光栅的频率和极化选择性
2015 European Microwave Conference (EuMC) Pub Date : 2015-12-03 DOI: 10.1109/EUMC.2015.7345732
T. Zinenko, A. Matsushima, A. Nosich
{"title":"Frequency and polarization selectivity of graphene strip gratings","authors":"T. Zinenko, A. Matsushima, A. Nosich","doi":"10.1109/EUMC.2015.7345732","DOIUrl":"https://doi.org/10.1109/EUMC.2015.7345732","url":null,"abstract":"We consider the scattering and absorption by infinite flat graphene strip gratings in a dielectric slab in the THz range. Both the H and E-polarization regimes are analyzed. Accurate numerical treatment is based on the use of singular integral equations and projection to orthogonal polynomials. The resulting numerical algorithm possesses guaranteed convergence and controlled accuracy of computations including the natural resonances. Reflectance, transmittance, and absorbance by the graphene-strip gratings are studied; surface-plasmon standing-wave resonances on strips are quantified in the H-polarization case. The potentialities of the polarization discrimination between the E-polarization and H-polarization cases are discussed.","PeriodicalId":350086,"journal":{"name":"2015 European Microwave Conference (EuMC)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127423112","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
An implemented non-focal Rotman lens 一种实现的非聚焦罗特曼透镜
2015 European Microwave Conference (EuMC) Pub Date : 2015-12-03 DOI: 10.1109/EURAD.2015.7346320
M. Rajabalian, B. Zakeri
{"title":"An implemented non-focal Rotman lens","authors":"M. Rajabalian, B. Zakeri","doi":"10.1109/EURAD.2015.7346320","DOIUrl":"https://doi.org/10.1109/EURAD.2015.7346320","url":null,"abstract":"Rotman lens is a feed network which has many applications in the field of phased array antennas. Dealing with the phase error is very important in Rotman lens design process. Designing Rotman lens using a non-focal idea has been done recently where the phase error is just reduced by optimizing the port positions. The method cannot be constructed easily because the location of the ports are unsuitable which causes mismatching and coupling. In this paper, a new process is presented to implement the lens, which converts three-focal Rotman Lens to non-focal and the phase error is properly reduced by using a simple procedure. The proposed non-focal Rotman lens has been implemented at 10GHz. Simulation and measurement results proved that the method is implementable. Furthermore, in comparison with previous reported work, the average improvement of the maximum phase error in the proposed lens, with 5 beam port and 5 array ports with overall lens size of 15*15 cm2, is 36% better.","PeriodicalId":350086,"journal":{"name":"2015 European Microwave Conference (EuMC)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127620112","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
A linearized, high efficiency 2.7 GHz wideband Doherty power amplifier with Class-J based performance enhancement 一种基于j类性能增强的线性化高效率2.7 GHz宽带Doherty功率放大器
2015 European Microwave Conference (EuMC) Pub Date : 2015-12-03 DOI: 10.1109/EUMC.2015.7345738
Neal Tuffy, L. Pattison
{"title":"A linearized, high efficiency 2.7 GHz wideband Doherty power amplifier with Class-J based performance enhancement","authors":"Neal Tuffy, L. Pattison","doi":"10.1109/EUMC.2015.7345738","DOIUrl":"https://doi.org/10.1109/EUMC.2015.7345738","url":null,"abstract":"This paper outlines the approach used for the design of a high efficiency 30W Doherty power amplifier. The benefits of exploiting the inherent device nonlinearities for Class-J PA operation are discussed, specifically in the case of Doherty amplifiers. The combination of Class-J modes and internal device matching ensures high performance in a compact, cost-sensitive Doherty amplifier design. To validate the discussed theory, a simple 2.7 GHz symmetric Doherty PA was designed and fabricated, producing 30W of output power with greater than 60% efficiency at 6 dB back-off. The PA was subsequently linearized using a wideband 20 MHz LTE signal with a PAPR of 6.5 dB. For an ACPR of <;-50 dBc, 8W of average output power was obtained with a corresponding efficiency of 60%.","PeriodicalId":350086,"journal":{"name":"2015 European Microwave Conference (EuMC)","volume":"92 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127047243","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
A 230 W, 1.8 to 2.2 GHz broadband LDMOS power amplifier utilizing multi-section integrated passive device input matching 基于多段集成无源器件输入匹配的230w 1.8 ~ 2.2 GHz宽带LDMOS功率放大器
2015 European Microwave Conference (EuMC) Pub Date : 2015-12-03 DOI: 10.1109/EUMC.2015.7345741
Lei Zhao, M. Watts, B. Noori, Jeffrey K. Jones
{"title":"A 230 W, 1.8 to 2.2 GHz broadband LDMOS power amplifier utilizing multi-section integrated passive device input matching","authors":"Lei Zhao, M. Watts, B. Noori, Jeffrey K. Jones","doi":"10.1109/EUMC.2015.7345741","DOIUrl":"https://doi.org/10.1109/EUMC.2015.7345741","url":null,"abstract":"This novel design technique was developed for the input pre-match circuit of discrete base station power amplifiers utilizing multi-section low pass, band pass and high pass topologies by carefully selecting the pole locations to achieve state of the art performance for broadband operation over 20% fractional bandwidth. The techniques have been applied to a 28 V, 230 W LDMOS PA to cover the RF bandwidth from 1.8 GHz to 2.2 GHz with equivalent RF performance for power, gain and efficiency as the narrowband designs while maintaining user-friendly input and load impedances as well as minimal linear phase distortion. To our knowledge, this is the first 28 V LDMOS high power amplifier capable of covering the 20% fractional bandwidth at 2 GHz reported to date.","PeriodicalId":350086,"journal":{"name":"2015 European Microwave Conference (EuMC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114141389","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
Improving upon pulse-to-pulse stability in GaN RADAR amplifiers compromised by the presence of GaN trapping effects 氮化镓雷达放大器中脉冲对脉冲稳定性的改善，该稳定性受到氮化镓捕获效应的影响
2015 European Microwave Conference (EuMC) Pub Date : 2015-12-03 DOI: 10.1109/EUMC.2015.7345843
D. Mccann, C. Zhu
{"title":"Improving upon pulse-to-pulse stability in GaN RADAR amplifiers compromised by the presence of GaN trapping effects","authors":"D. Mccann, C. Zhu","doi":"10.1109/EUMC.2015.7345843","DOIUrl":"https://doi.org/10.1109/EUMC.2015.7345843","url":null,"abstract":"In this paper we report on the characterization of GaN Power devices for sequential inter-pulse stability factors attributable to thermal and trapping effects in the transistor. The key observations are critical to successful design and insertion of GaN based semiconductor products in future RADAR applications. Comparison data between different devices and their application will be highlighted as part of the work. A novel application and pre-correction circuit and methodology will also be presented along with results. Use of the pre-correction circuitry will also allow the RADAR system designer to apply trap impaired GaN amplifiers when multiple or staggered-PRF strategies are employed in the RADAR system.","PeriodicalId":350086,"journal":{"name":"2015 European Microwave Conference (EuMC)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123011057","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
Parametric characterization of six-port interferometer demodulator through mixer modeling 通过混频器建模对六端口干涉仪解调器进行参数化表征
2015 European Microwave Conference (EuMC) Pub Date : 2015-12-03 DOI: 10.1109/EUMC.2015.7345816
J. Moghaddasi, Kuangda Wang, K. Wu
{"title":"Parametric characterization of six-port interferometer demodulator through mixer modeling","authors":"J. Moghaddasi, Kuangda Wang, K. Wu","doi":"10.1109/EUMC.2015.7345816","DOIUrl":"https://doi.org/10.1109/EUMC.2015.7345816","url":null,"abstract":"Functional parameters of six-port demodulator are studied in this paper. Indeed, noise figure (NF), conversion loss and inter-modulation products, which are the key parameters of a mixer, are derived through theoretical analysis and validated by simulations. In order to reduce the conversion loss while keeping the power detector's working condition in the square law region and maintain the benefits of low-power LO, the detector biasing technique is also investigated. Also, by modeling the six-port interferometer as a mixer, a platform of extracting a set of equivalent mixer parameters through circuit simulations is proposed. As a case study, the proposed technique is applied to extract the mixer model of a six-port interferometer demodulator operating in E-band with a commercial diode of Avago HSCH-9161. Such a modeling technique provides RF receiver designers a quantitative way of understanding the six-port interferometer demodulators and comparing them with traditional mixer-based zero-IF demodulators.","PeriodicalId":350086,"journal":{"name":"2015 European Microwave Conference (EuMC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133012086","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
Modulated corner reflector using frequency selective surfaces for FMCW radar applications 使用频率选择表面的调制角反射器用于FMCW雷达应用
2015 European Microwave Conference (EuMC) Pub Date : 2015-12-03 DOI: 10.1109/EUMC.2015.7345712
A. Lázaro, J. Lorenzo, R. Villarino, D. Girbau
{"title":"Modulated corner reflector using frequency selective surfaces for FMCW radar applications","authors":"A. Lázaro, J. Lorenzo, R. Villarino, D. Girbau","doi":"10.1109/EUMC.2015.7345712","DOIUrl":"https://doi.org/10.1109/EUMC.2015.7345712","url":null,"abstract":"This work describes a modulated transponder based on a corner reflector where at least one of the metallic surfaces is replaced by an actively-controlled frequency selective surface (FSS) loaded with switching PIN diodes. The reflectivity of the faces loaded with the FSS changes with the bias of the diodes modulating the radar cross-section of the corner. The transponder therefore answers the reader, modulating the backscattered field. In addition, the retrodirectivity property of corner reflectors enables the response to be distinguished from the interference of non-modulated clutter reducing multipath effects. This approach allows high values of backscattered fields to be obtained over large angle beam widths and frequency bandwidths. An experimental setup based on a commercial X-band FMCW radar is used to measure the transponders. Experimental results obtained for a dihedral corner reflector and a cross reflector transponder at several distances are provided. In the first case, a sectorial angular coverage is obtained, whereas in the second case a quasi-onmidirectional performance is obtained.","PeriodicalId":350086,"journal":{"name":"2015 European Microwave Conference (EuMC)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127858147","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
Compact SIW based multimode filters for future generation wireless front-ends 紧凑型基于SIW的多模滤波器，用于下一代无线前端
2015 European Microwave Conference (EuMC) Pub Date : 2015-12-03 DOI: 10.1109/EUMC.2015.7345926
U. Naeem, S. Bila
{"title":"Compact SIW based multimode filters for future generation wireless front-ends","authors":"U. Naeem, S. Bila","doi":"10.1109/EUMC.2015.7345926","DOIUrl":"https://doi.org/10.1109/EUMC.2015.7345926","url":null,"abstract":"The presented work proposes multimode filters that can be used for compact RF front-ends for emerging wireless technologies. Efficient coupling technique is proposed which is capable to realize different filter responses. These filters are integrated into dielectric substrate and exploit three waveguide modes installed in a single cavity. The couplings among the modes and with the source / load can be adjusted to realize maximum of two real and asymmetric transmission zeros for a single cavity filter. The ability to arbitrarily position one or two transmission zeros make the proposed filters adaptable to different requirements. The presented results show the flexibility of the realized filters to achieve desired responses. The technique can easily be employed for higher order filters.","PeriodicalId":350086,"journal":{"name":"2015 European Microwave Conference (EuMC)","volume":"202 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128710327","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
A mixed frequency approach to optimize locoregional RF hyperthermia 优化局部射频热疗的混合频率方法
2015 European Microwave Conference (EuMC) Pub Date : 2015-12-03 DOI: 10.1109/EUMC.2015.7345878
H. Kok, G. van Stam, A. Bel, J. Crezee
{"title":"A mixed frequency approach to optimize locoregional RF hyperthermia","authors":"H. Kok, G. van Stam, A. Bel, J. Crezee","doi":"10.1109/EUMC.2015.7345878","DOIUrl":"https://doi.org/10.1109/EUMC.2015.7345878","url":null,"abstract":"Locoregional hyperthermia is usually performed using phased-array systems, consisting of multiple RF antennas operating at a single frequency. This study investigated the use of a mixed frequency approach to improve the quality of heating. Simulations in a homogeneous phantom and in 5 patient anatomies were performed for systems consisting of rectangular waveguides operating at 70 and 140 MHz. Phantom results were very promising and showed a 20% lower superficial SAR deposition compared to the central target region for a 3-ring system with the central ring consisting of 140 MHz waveguides and the other two rings consisting of 70 MHz waveguides. In patient anatomies however, this benefit did not last, so further research is required to determine the optimal mixed frequency strategy for clinical use.","PeriodicalId":350086,"journal":{"name":"2015 European Microwave Conference (EuMC)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128518561","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
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