R. Malmqvist, A. Gustafsson, W. Simon, M. A. Campo, L. Baggen, B. Grandchamp, S. Seok, M. Fryziel, N. Rolland, M. Lahti, P. Rantakari, T. Vaha-Heikkila
{"title":"An RF-MEMS based SP4T switched LNA MMIC used in a 24 GHz beam-steering antenna module","authors":"R. Malmqvist, A. Gustafsson, W. Simon, M. A. Campo, L. Baggen, B. Grandchamp, S. Seok, M. Fryziel, N. Rolland, M. Lahti, P. Rantakari, T. Vaha-Heikkila","doi":"10.1109/EUMIC.2015.7345136","DOIUrl":"https://doi.org/10.1109/EUMIC.2015.7345136","url":null,"abstract":"This paper presents an RF-MEMS SP4T switched LNA MMIC used in a 24 GHz beam-steering antenna module. The SP4T LNA has a measured gain of 10-16 dB at 16-30 GHz (NF=2.6-3.0 dB at 16-26 GHz) with up to 37 dB of isolation at 24 GHz when one of the four MEMS switches are closed while the other switches are open. To the authors' knowledge, this work represents a first-time realisation of a MEMS SP4T LNA MMIC used as an on-chip active beam-switching network in an adaptive antenna. The experimental results successfully demonstrate that the MEMS SP4T LNA can be used to control the antenna beam in 4 different directions between -55° and 45° in the same plane.","PeriodicalId":350086,"journal":{"name":"2015 European Microwave Conference (EuMC)","volume":"17 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":"132729236","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}
{"title":"Textile SIW antennas as hybrid energy harvesting and power management platforms","authors":"S. Lemey, S. Agneessens, H. Rogier","doi":"10.1109/EUMC.2015.7345689","DOIUrl":"https://doi.org/10.1109/EUMC.2015.7345689","url":null,"abstract":"A compact, highly-integrated and unobtrusive wearable textile antenna system, able to establish a reliable and energy-efficient wireless body-centric communication link in the [2.4-2.4835]-GHz Industrial, Scientific and Medical band and enabling energy harvesting from three different energy sources, is presented. Our design approach relies on further extending the functionality of a carefully selected textile antenna by exploiting its surface as an energy scavenging and power management platform. More specific, two different ultra-flexible solar cells, a micro-energy cell and a flexible power management system are integrated onto a wearable substrate integrated waveguide cavity-backed textile slot antenna to enable energy harvesting from both solar and artificial light. Furthermore, thermal body energy harvesting, via an externally connected thermoelectric generator, is enabled by including an ultra-low voltage step-up converter. Measurements in four well-chosen indoor scenarios demonstrate that a hybrid energy-harvesting approach is necessary to obtain a more continuous flow and a higher amount of scavenged energy, leading to a higher system autonomy and/or reduced battery size.","PeriodicalId":350086,"journal":{"name":"2015 European Microwave Conference (EuMC)","volume":"9 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":"125223997","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}
{"title":"High efficiency and high power GaN HEMT inverse class-F synchronous rectifier for wireless power applications","authors":"S. Abbasian, T. Johnson","doi":"10.1109/EUMC.2015.7345759","DOIUrl":"https://doi.org/10.1109/EUMC.2015.7345759","url":null,"abstract":"Experimental results are shown for a high power GaN RF synchronous rectifier configured in an inverse class-F circuit topology. The rectifier is constructed from an inverse class-F amplifier by adding feedback from the output to the input and then driving the output node as a RF input and replacing the DC drain supply with a DC load resistance. Both the amplifier and rectifier duals are tested under identical source power conditions. The amplifier has a drain efficiency of 84.3% for an output power of 10 W, while the rectifier has a rectification efficiency of 85% for a DC output power of 10.15 W. To the best knowledge of the authors, this is the highest reported power for a RF synchronous inverse class-F rectifier. The rectifier has a large dynamic range, and at 20 dB back-off, the efficiency is 48.5% for 100 mW of RF input power.","PeriodicalId":350086,"journal":{"name":"2015 European Microwave Conference (EuMC)","volume":"28 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":"125357405","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}
{"title":"Versatile phasers constituted of coupling-free nonuniform stub-loaded transmission lines","authors":"S. Taravati, C. Caloz","doi":"10.1109/EUMC.2015.7345774","DOIUrl":"https://doi.org/10.1109/EUMC.2015.7345774","url":null,"abstract":"A nonuniform stub-loaded and coupling-free broadband phaser is proposed as an alternative to conventional coupled-line sections based phasers for enhanced design flexibility, reduced complexity and lower cost in Radio Analog Signal Processing (R-ASP) systems. Nonuniform open- and short-terminated stub-loaded sections are employed to achieve specified highly flexible group delays with flat transmission magnitude responses. The phaser does not require multilayer or wire-bonding technologies since it consists of coupling-free transmission lines. The principle and synthesis procedure of the phaser are presented and two design examples with diverse specifications are presented with theory and full-wave simulation results. The phaser can be realized using microstrip technology and integrate with different lumped components and planar structures.","PeriodicalId":350086,"journal":{"name":"2015 European Microwave Conference (EuMC)","volume":"20 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":"131972553","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}
{"title":"A wide stopband low-pass Wilkinson power divider","authors":"Chih-Jung Chen, Yin-Drin Su","doi":"10.1109/EUMC.2015.7345945","DOIUrl":"https://doi.org/10.1109/EUMC.2015.7345945","url":null,"abstract":"The conventional Wilkinson power divider has spurious passbands at odd multiples of the center frequency, due to the use of quarter-wave transformers. For practical applications, the spurious passbands generally need to be suppressed by cascading filters, which acts against the trend of microwave systems that are toward miniaturization and integration. In this paper, a low-pass Wilkinson power divider is designed based on artificial low-pass transmission lines. The power divider is a compact design that fits into a circuit size of 0.17λg x 0.1λg on an RO4003 substrate, where λg is the guided wavelength at the center frequency of 0.9 GHz. The low-pass power divider has well-defined passband, transition, and stopband regions. It behaves like the conventional Wilkinson power divider in the passband, while has a wide stopband from 1.8 GHz to 20 GHz, as indicated by the experimental results.","PeriodicalId":350086,"journal":{"name":"2015 European Microwave Conference (EuMC)","volume":"227 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":"133638754","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}
M. Sans, J. Selga, P. Vélez, Ana Rodríguez, J. Bonache, V. Boria, F. Martín
{"title":"Application of aggressive space mapping (ASM) to the automated design of differential-mode wideband bandpass filters with common-mode suppression","authors":"M. Sans, J. Selga, P. Vélez, Ana Rodríguez, J. Bonache, V. Boria, F. Martín","doi":"10.1109/EUMC.2015.7345817","DOIUrl":"https://doi.org/10.1109/EUMC.2015.7345817","url":null,"abstract":"This paper is focused on the automated design of microstrip differential-mode (balanced) wideband bandpass filters based on mirrored stepped impedance resonators (SIRs) coupled through admittance inverters. The central metallic patches of the mirrored SIRs introduce common-mode transmission zeros, useful for the suppression of that mode in the differential filter pass band. The main relevant and novel aspect of this paper is the implementation of an unattended filter design algorithm, able to automatically provide the filter layout of these differential filters satisfying predefined specifications. The optimization algorithm is based on a two-step aggressive space mapping (ASM) scheme. The first ASM algorithm provides the optimum filter schematic; namely, it recalculates the lumped elements of the resonators and the electrical lengths of the transmission line sections (impedance inverters), in order to compensate the bandwidth reduction related to the limited functionality of the inverters. Once the filter schematic providing the required specifications (optimum schematic) is determined, the second ASM automatically generates the filter layout. The two-step ASM algorithm is validated through the design of an order-5 common-mode suppressed balanced Chebyshev bandpass filter with 40% fractional bandwidth (corresponding to 43.96% -3dB fractional bandwidth) centered at f0 = 2.4 GHz. Filter design is achieved following a completely unattended scheme, and the response satisfies the specifications to a very good approximation.","PeriodicalId":350086,"journal":{"name":"2015 European Microwave Conference (EuMC)","volume":"40 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":"121683870","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}
M. Sánchez-Soriano, Y. Quéré, V. Le Saux, C. Quendo, J. D. Martínez, V. Boria
{"title":"Study on energy recovery from substrate integrated waveguide circuits","authors":"M. Sánchez-Soriano, Y. Quéré, V. Le Saux, C. Quendo, J. D. Martínez, V. Boria","doi":"10.1109/EUMC.2015.7345722","DOIUrl":"https://doi.org/10.1109/EUMC.2015.7345722","url":null,"abstract":"In this work, the energy recovery in microwave passive circuits from the power losses into heat is studied. For this purpose, a thermo-electric generator (TEG) based on the Seebeck effect principle is used, which converts part of the power dissipated into heat to DC electrical power. A solution integrating the TEG with a substrate integrated waveguide (SIW) circuit is proposed, and design guidelines in order to optimize the recovered power are provided. As will be shown, under moderate applied signal powers of just 1-5 W, the levels of recovered power in SIW passive circuits can be notable. As a demonstrator circuit, an integration device formed by an X-band SIW bandpass filter and a TEG is designed, fabricated and characterized (thermal and electrically). Different scenarios are considered, depending on frequency and thermal loads. For an applied inband CW input signal power of 2 W at 9.68 GHz, a recovered power of around 310 μW has been continuously supplied to the electrical load. Several aspects such as efficiency and future improvements are also discussed.","PeriodicalId":350086,"journal":{"name":"2015 European Microwave Conference (EuMC)","volume":"189 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":"124180642","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}
Filipe M. Barradas, Pedro Miguel Lavrador, T. Cunha, J. Pedro
{"title":"RF PA modeling with one chirp measurement","authors":"Filipe M. Barradas, Pedro Miguel Lavrador, T. Cunha, J. Pedro","doi":"10.1109/EUMC.2015.7345984","DOIUrl":"https://doi.org/10.1109/EUMC.2015.7345984","url":null,"abstract":"In this paper we present a technique for obtaining a behavioral model for a power amplifier using a single exponential chirp measurement. The obtained model is equal to the memory polynomial. However, the process relies on a particular excitation that enables orthogonal extraction, making the identification quick and reliable. The model presents good approximation results for different excitations, and can be used for close inspection of the harmonic frequency responses of a power amplifier.","PeriodicalId":350086,"journal":{"name":"2015 European Microwave Conference (EuMC)","volume":"7 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":"124008577","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}
{"title":"A design of unequal termination impedance power divider with filtering and out-of-band suppression characteristics","authors":"P. Kim, Junhyung Jeong, G. Chaudhary, Y. Jeong","doi":"10.1109/EUMC.2015.7345715","DOIUrl":"https://doi.org/10.1109/EUMC.2015.7345715","url":null,"abstract":"This paper presents a design of unequal termination impedance 3-dB power divider with filtering and out-of-band suppression characteristics. Two transmission poles are appeared in the passband by controlling characteristic impedance of shunt half-wavelength transmission line. For an experimental validation, the proposed 3-dB power divider with an impedance transforming ratio of 3 is designed at the center frequency (f0) of 2.6 GHz. From measurements, the magnitude of S21 and S31 are determined to be -3.8 dB and -3.6 dB at f0. The amplitude division within -3.9 dB is obtained on the bandwidth of 480 MHz (2.4-2.88 GHz). The input and output return losses are higher than 15.58 dB for the same bandwidth. Moreover, the isolation between output ports is higher than 11.4 dB from DC to 7.4 GHz.","PeriodicalId":350086,"journal":{"name":"2015 European Microwave Conference (EuMC)","volume":"28 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":"125183040","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}
{"title":"Study on multiple stream transmission by using multiple polarizations","authors":"Maki Arai, T. Seki, N. Shinohara","doi":"10.1109/EUMC.2015.7346024","DOIUrl":"https://doi.org/10.1109/EUMC.2015.7346024","url":null,"abstract":"In this paper, we propose a new method for achieving multiple stream transmission by using multiple polarizations. Using polarization switching sequences corresponding to streams enables interferences to be canceled and multiple streams to be made because the polarizations are symmetrical regardless of antenna spacing. Therefore, the method is effective when antenna spacing is small. To achieve high data rates, a number of antennas should be placed in a limited space by using higher frequency bands and multiple-input multiple-output (MIMO) technology, thus small antenna spacing is necessary for future wireless communication systems. In the conventional MIMO method, however, the channel capacity is degraded due to spatial correlation and a number of antennas cannot be placed in a limited space because large antenna spacing is needed to decrease the spatial correlation. To solve the problem, we propose a multiple stream transmission method in which multiple polarizations can be used with any antenna spacing. Numerical analysis revealed that the channel capacity per unit area achieved with our method increases in proportion to the number of streams.","PeriodicalId":350086,"journal":{"name":"2015 European Microwave Conference (EuMC)","volume":"28 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":"129624835","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}