Pub Date : 2012-10-01DOI: 10.23919/EUMC.2012.6459078
X. Lian, H. Nikookar
Cognitive Radio (CR) is an intelligent radio system, which is capable of being aware of the communication environment and consequently adapts to it. With Null Broadening (NB) technique, CR can share the spectrum and coexist with licensed users (LU) by displaying nulls to a certain range of Direction of Arrival (DOA) of LU. In this paper, we present a new CR downlink beamforming method via combining filtering and NB techniques together, which enables CR to broaden and also deepen the nulls towards LU directions. Meanwhile, it also enlarges the width of the main beam to tolerate the DOA ambiguity of CR users. After employing the proposed method, CR directs the main beam towards its own users while putting deeper and wider nulls to the LU in the downlink beamforming. The proposed beamforming scheme causes less interference to LU while sharing the same spectrum.
认知无线电(Cognitive Radio, CR)是一种能够感知通信环境并适应通信环境的智能无线电系统。Null展宽(NB)技术通过在许可用户的DOA (Direction of Arrival)的一定范围内显示Null，使CR与许可用户共享频谱并共存。在本文中，我们提出了一种结合滤波和NB技术的CR下行波束形成新方法，该方法可以使CR向低频方向加宽和加深零点。同时，它还扩大了主波束的宽度，以容忍CR用户的方位模糊。采用该方法后，CR在下行波束形成时将主波束引导到自己的用户，同时将更深更宽的空区置于LU中。所提出的波束形成方案在共享同一频谱的情况下，对链路的干扰较小。
{"title":"Downlink beamforming with broadened and deepened nulls for Cognitive Radio","authors":"X. Lian, H. Nikookar","doi":"10.23919/EUMC.2012.6459078","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459078","url":null,"abstract":"Cognitive Radio (CR) is an intelligent radio system, which is capable of being aware of the communication environment and consequently adapts to it. With Null Broadening (NB) technique, CR can share the spectrum and coexist with licensed users (LU) by displaying nulls to a certain range of Direction of Arrival (DOA) of LU. In this paper, we present a new CR downlink beamforming method via combining filtering and NB techniques together, which enables CR to broaden and also deepen the nulls towards LU directions. Meanwhile, it also enlarges the width of the main beam to tolerate the DOA ambiguity of CR users. After employing the proposed method, CR directs the main beam towards its own users while putting deeper and wider nulls to the LU in the downlink beamforming. The proposed beamforming scheme causes less interference to LU while sharing the same spectrum.","PeriodicalId":266910,"journal":{"name":"2012 42nd European Microwave Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131551325","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}
Pub Date : 2012-10-01DOI: 10.23919/EUMC.2012.6459171
L. Zwirello, C. Heine, Xuyang Li, T. Schipper, T. Zwick
One of the most important issues in Ultra-Wideband (UWB) communication is the achievable transmission distance. Due to the regulatory issues the transmit power is strictly limited, therefore larger ranges can be achieved by using the receivers with best noise handling properties. In this paper several UWB transceiver architectures, most commonly encountered in the literature, are selected and compared with each other. From this group, three receiver structures are chosen for a simulation-and measurement-based performance verification in terms of the Signal-to-Noise Ratio in the processed signal. The firm base for the comparison among the architectures is assured by the common hardware. The implemented generic UWB transceiver enables the realization of different receiver structures by introducing only minor modifications.
{"title":"SNR performance verification of different UWB receiver architectures","authors":"L. Zwirello, C. Heine, Xuyang Li, T. Schipper, T. Zwick","doi":"10.23919/EUMC.2012.6459171","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459171","url":null,"abstract":"One of the most important issues in Ultra-Wideband (UWB) communication is the achievable transmission distance. Due to the regulatory issues the transmit power is strictly limited, therefore larger ranges can be achieved by using the receivers with best noise handling properties. In this paper several UWB transceiver architectures, most commonly encountered in the literature, are selected and compared with each other. From this group, three receiver structures are chosen for a simulation-and measurement-based performance verification in terms of the Signal-to-Noise Ratio in the processed signal. The firm base for the comparison among the architectures is assured by the common hardware. The implemented generic UWB transceiver enables the realization of different receiver structures by introducing only minor modifications.","PeriodicalId":266910,"journal":{"name":"2012 42nd European Microwave Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132638276","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}
For future millimeter-wave backhaul links, the increasing demand of high-speed communication systems over 10-Gbps is imposing an increasing modulation complexity from 64-QAM to 256-QAM, or even up to 1024-QAM, which results in a stringent linearity requirement of the millimeter-wave CMOS transceiver design. This paper will cover recently reported linearization techniques for millimeter-wave CMOS low-noise amplifiers, frequency converters, and power amplifiers. These techniques are essential for future efficiency enhancement and self-calibrated high-yield mass production of millimeter-wave products.
{"title":"Millimeter-wave CMOS transceiver linearization for ultra high-speed wireless backhaul links","authors":"Tian-Wei Huang, Wei-Tsung Li, Hong-Yuan Yang, Yen-Hung Kuo, J. Cheng, Jeng‐Han Tsai","doi":"10.23919/EUMC.2012.6459093","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459093","url":null,"abstract":"For future millimeter-wave backhaul links, the increasing demand of high-speed communication systems over 10-Gbps is imposing an increasing modulation complexity from 64-QAM to 256-QAM, or even up to 1024-QAM, which results in a stringent linearity requirement of the millimeter-wave CMOS transceiver design. This paper will cover recently reported linearization techniques for millimeter-wave CMOS low-noise amplifiers, frequency converters, and power amplifiers. These techniques are essential for future efficiency enhancement and self-calibrated high-yield mass production of millimeter-wave products.","PeriodicalId":266910,"journal":{"name":"2012 42nd European Microwave Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113994946","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}
Pub Date : 2012-10-01DOI: 10.23919/EUMC.2012.6459296
P. Farinelli, H. El Ghannudi, G. Resta, B. Margesin, M. Erspan, R. Sorrentino
This paper presents the development of a fully packaged and connectorized SP4T MEMS switch for space applications. The device is provided with metal hermetic box, SSMA and SMA connectors and space qualified DC-DC Converter to operate with standard 0-5V signals. The fully packaged switches show insertion loss better than 0.65dB and isolation better than 50dB up to 240MHz. Power handling capability up to 2.5W was demonstrated during the 160h of the applied burn-in test. The devices has been developed by RF Microtech (Perugia - Italy), FBK (Fondazione Bruno Kessler - Trento - Italy) and Optoi Microelectronics (Trento - Italy).
{"title":"High power SP4T MEMS switch for space applications","authors":"P. Farinelli, H. El Ghannudi, G. Resta, B. Margesin, M. Erspan, R. Sorrentino","doi":"10.23919/EUMC.2012.6459296","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459296","url":null,"abstract":"This paper presents the development of a fully packaged and connectorized SP4T MEMS switch for space applications. The device is provided with metal hermetic box, SSMA and SMA connectors and space qualified DC-DC Converter to operate with standard 0-5V signals. The fully packaged switches show insertion loss better than 0.65dB and isolation better than 50dB up to 240MHz. Power handling capability up to 2.5W was demonstrated during the 160h of the applied burn-in test. The devices has been developed by RF Microtech (Perugia - Italy), FBK (Fondazione Bruno Kessler - Trento - Italy) and Optoi Microelectronics (Trento - Italy).","PeriodicalId":266910,"journal":{"name":"2012 42nd European Microwave Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114123137","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}
Pub Date : 2012-10-01DOI: 10.23919/EUMC.2012.6459335
O. Karabey, S. Bausch, S. Bildik, S. Strunck, A. Gaebler, R. Jakoby
This paper presents design and application of a varactor loaded tunable coupled line for a polarization agile antenna. Based on the investigations, a method is proposed to reduce the required varactor tunability. Later on, the results are verified by prototyping an antenna, which consists of a liquid crystal based tunable coupled line. The antenna operates at 13.75 GHz with a return loss of better than 10 dB. The measurement results confirm that the polarization state of the antenna can be changed continuously between linear and circular polarizations by applying a DC bias voltage to the varactors.
{"title":"Design and application of a liquid crystal varactor based tunable coupled line for polarization agile antennas","authors":"O. Karabey, S. Bausch, S. Bildik, S. Strunck, A. Gaebler, R. Jakoby","doi":"10.23919/EUMC.2012.6459335","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459335","url":null,"abstract":"This paper presents design and application of a varactor loaded tunable coupled line for a polarization agile antenna. Based on the investigations, a method is proposed to reduce the required varactor tunability. Later on, the results are verified by prototyping an antenna, which consists of a liquid crystal based tunable coupled line. The antenna operates at 13.75 GHz with a return loss of better than 10 dB. The measurement results confirm that the polarization state of the antenna can be changed continuously between linear and circular polarizations by applying a DC bias voltage to the varactors.","PeriodicalId":266910,"journal":{"name":"2012 42nd European Microwave Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115808455","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}
Pub Date : 2012-10-01DOI: 10.23919/EUMC.2012.6459402
T. Maleszka, P. Kabacik
The paper describes performance of textile and flexible antennas operating in the nearest vicinity of human body (at S-band and UHF), manufactured with use of four techniques. Presented results of our studies have revealed, a kind of fabric used to antenna manufacture has remarkable effect on gain, efficiency, radiation pattern and antenna bandwidth defined by impedance and other terms.
{"title":"Variations in properties of on- and off-body antennas manufactured with various fabrics","authors":"T. Maleszka, P. Kabacik","doi":"10.23919/EUMC.2012.6459402","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459402","url":null,"abstract":"The paper describes performance of textile and flexible antennas operating in the nearest vicinity of human body (at S-band and UHF), manufactured with use of four techniques. Presented results of our studies have revealed, a kind of fabric used to antenna manufacture has remarkable effect on gain, efficiency, radiation pattern and antenna bandwidth defined by impedance and other terms.","PeriodicalId":266910,"journal":{"name":"2012 42nd European Microwave Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124490852","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}
Pub Date : 2012-10-01DOI: 10.23919/EUMC.2012.6459196
D. Glay, A. El Fellahi, T. Lasri
In this paper we present a novel method of near-field microwave microscopy using a high impedance measurement system. The proposed system combines a classical vector network analyzer to a high referenced impedance splitter via impedance matching networks. We show that the resulting high impedance reflectometer associated to a tip probe permits to compensate the limitation of the non-resonant mode by using the frequency diversity.
{"title":"High impedance reflectometer dedicated to non-resonant near-field microwave microscopy","authors":"D. Glay, A. El Fellahi, T. Lasri","doi":"10.23919/EUMC.2012.6459196","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459196","url":null,"abstract":"In this paper we present a novel method of near-field microwave microscopy using a high impedance measurement system. The proposed system combines a classical vector network analyzer to a high referenced impedance splitter via impedance matching networks. We show that the resulting high impedance reflectometer associated to a tip probe permits to compensate the limitation of the non-resonant mode by using the frequency diversity.","PeriodicalId":266910,"journal":{"name":"2012 42nd European Microwave Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124773576","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}
Pub Date : 2012-10-01DOI: 10.23919/EUMC.2012.6459422
G. Sajin, F. Craciunoiu, A. Dinescu, I. Mocanu, A. Stefanescu
The paper presents a zeroth order resonance (ZOR) Composite Right / Left-Handed (CRLH) coplanar waveguide (CPW) antenna on AlSiMag 614 alumina substrate. The device was designed, microprocessed by laser ablation and tested for millimeter wave frequency range (48 GHz). Experimental results for two antenna samples show return loss of -21.98 dB at 48.01 GHz and -20.42 dB at 48.17 GHz respectively. The -3 dB beamwidth of the transversal radiation lobe for two antenna samples are 57° and 54°, respectively. The gain measured at 48 GHz using the De Friis method was 8.98 dBi.
{"title":"Laser ablated 48 GHz ZOR CRLH antenna on alumina substrate","authors":"G. Sajin, F. Craciunoiu, A. Dinescu, I. Mocanu, A. Stefanescu","doi":"10.23919/EUMC.2012.6459422","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459422","url":null,"abstract":"The paper presents a zeroth order resonance (ZOR) Composite Right / Left-Handed (CRLH) coplanar waveguide (CPW) antenna on AlSiMag 614 alumina substrate. The device was designed, microprocessed by laser ablation and tested for millimeter wave frequency range (48 GHz). Experimental results for two antenna samples show return loss of -21.98 dB at 48.01 GHz and -20.42 dB at 48.17 GHz respectively. The -3 dB beamwidth of the transversal radiation lobe for two antenna samples are 57° and 54°, respectively. The gain measured at 48 GHz using the De Friis method was 8.98 dBi.","PeriodicalId":266910,"journal":{"name":"2012 42nd European Microwave Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113962151","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}
Pub Date : 2012-10-01DOI: 10.23919/EUMC.2012.6459087
M. Cordoba-Erazo, T. Weller
A dielectric resonator-based microwave probe for low loss and lossy liquids characterization is presented in this paper. When the probe is operated under in-situ conditions, improvement of the probe sensitivity to variations in the permittivity of the liquid was observed. Measurements of the quality factor of the resonator reveal that the probe is able to resolve variations around 0.04 in e' for low loss liquids. The spatial resolution of the probe is 10 μm, and was experimentally verified by scanning a MMIC detector covered with a 30 μm thick layer of mineral oil, at a standoff distance of 10 μm. Scanning results confirm that the presence of the mineral oil layer on top of the circuit improves the sensitivity of the probe without degrading the spatial resolution. Simulated data using a lumped-element model of the probe and sample support the measured results.
{"title":"Liquids characterization using a dielectric resonator-based microwave probe","authors":"M. Cordoba-Erazo, T. Weller","doi":"10.23919/EUMC.2012.6459087","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459087","url":null,"abstract":"A dielectric resonator-based microwave probe for low loss and lossy liquids characterization is presented in this paper. When the probe is operated under in-situ conditions, improvement of the probe sensitivity to variations in the permittivity of the liquid was observed. Measurements of the quality factor of the resonator reveal that the probe is able to resolve variations around 0.04 in e' for low loss liquids. The spatial resolution of the probe is 10 μm, and was experimentally verified by scanning a MMIC detector covered with a 30 μm thick layer of mineral oil, at a standoff distance of 10 μm. Scanning results confirm that the presence of the mineral oil layer on top of the circuit improves the sensitivity of the probe without degrading the spatial resolution. Simulated data using a lumped-element model of the probe and sample support the measured results.","PeriodicalId":266910,"journal":{"name":"2012 42nd European Microwave Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114957555","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}
Pub Date : 2012-10-01DOI: 10.23919/EUMC.2012.6459248
Nasimuddin, Zhi Ning Chen, X. Qing
A microstrip-fed symmetric-slot antenna is proposed for wideband circularly polarized radiation. The antenna consists of a microstrip feed line and a wide symmetrical slot along the diagonal axis. The slot and feeding structure are fabricated on the opposite plane of a low cost FR4 substrate. The wideband is achieved by changing the symmetric-shaped slot lengths and a strip-line length. The measured 3-dB axial ratio and 10-dB return-loss bandwidths of the antenna are around 50% and more than 100% respectively. The boresight gain and backside gain is more than 3.0 dBic over the 3-dB axial ratio bandwidth.
{"title":"Wideband circularly polarized slot antenna","authors":"Nasimuddin, Zhi Ning Chen, X. Qing","doi":"10.23919/EUMC.2012.6459248","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459248","url":null,"abstract":"A microstrip-fed symmetric-slot antenna is proposed for wideband circularly polarized radiation. The antenna consists of a microstrip feed line and a wide symmetrical slot along the diagonal axis. The slot and feeding structure are fabricated on the opposite plane of a low cost FR4 substrate. The wideband is achieved by changing the symmetric-shaped slot lengths and a strip-line length. The measured 3-dB axial ratio and 10-dB return-loss bandwidths of the antenna are around 50% and more than 100% respectively. The boresight gain and backside gain is more than 3.0 dBic over the 3-dB axial ratio bandwidth.","PeriodicalId":266910,"journal":{"name":"2012 42nd European Microwave Conference","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122550703","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}
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