Pub Date : 2012-10-01DOI: 10.23919/EUMC.2012.6459413
Zhenhai Ji, Weiqiang Zhu, Zhijian Li, Yongzhi Sun, Qi Wang
Conventional Phased array antenna (PAA) had beam squint during scanning in wide instantaneous bandwidth, and the paper proposed a novel method based on optical true time delay (OTTD) to solve the problem, which adopted the hybrid architecture of by-pass and differential architecture to realize the OTTD. The novel method has characteristics of high delay accuracy, compact volume and low loss. The experiments show the proposed method, which can solve the beam squint during scanning wide bandwidth and have better amplitude-frequency and phase response character as well as.
{"title":"A novel method of optical true time delay in phased array antenna","authors":"Zhenhai Ji, Weiqiang Zhu, Zhijian Li, Yongzhi Sun, Qi Wang","doi":"10.23919/EUMC.2012.6459413","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459413","url":null,"abstract":"Conventional Phased array antenna (PAA) had beam squint during scanning in wide instantaneous bandwidth, and the paper proposed a novel method based on optical true time delay (OTTD) to solve the problem, which adopted the hybrid architecture of by-pass and differential architecture to realize the OTTD. The novel method has characteristics of high delay accuracy, compact volume and low loss. The experiments show the proposed method, which can solve the beam squint during scanning wide bandwidth and have better amplitude-frequency and phase response character as well as.","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":"123888243","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.2012.6459255
S. Cogollos, V. Boria, J. D. Martinez
The use and synthesis of stepped impedance transformers for multi-band applications is revisited from a new point of view. A short step commensurate transformer can be used for impedance matching simultaneously at several frequencies/bands, even for the important first harmonic frequency 2 f0. An automated synthesis procedure borrowed from the lowpass filter theory is fully described. This procedure can provide reflection zeros at arbitrary frequency locations, thus leading to general responses in terms of return losses and matching frequencies. Finally, to validate the theory a microstrip prototype has been manufactured and measured.
{"title":"Generalized short step transformers for multi-band impedance matching","authors":"S. Cogollos, V. Boria, J. D. Martinez","doi":"10.23919/EUMC.2012.6459255","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459255","url":null,"abstract":"The use and synthesis of stepped impedance transformers for multi-band applications is revisited from a new point of view. A short step commensurate transformer can be used for impedance matching simultaneously at several frequencies/bands, even for the important first harmonic frequency 2 f0. An automated synthesis procedure borrowed from the lowpass filter theory is fully described. This procedure can provide reflection zeros at arbitrary frequency locations, thus leading to general responses in terms of return losses and matching frequencies. Finally, to validate the theory a microstrip prototype has been manufactured and measured.","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":"131377745","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.2012.6459265
J. P. Magalhães, J. Vieira, R. Gómez‐García, N. Carvalho
This paper proposes an original architecture for a Software-Defined-Radio receiver based on an Hybrid Filter Bank. The key issue for its proper operation is the channelization of the incoming signal into multiple sub-bands, that is performed at two stages: radio-frequency (RF) and intermediate-frequency (IF) levels. Thus, low-cost analog-to-digital converters (ADCs) can be employed for the sampling of these sub-bands to be subsequently processed at the digital level for the overall signal reconstruction. Special attention is given to the RF and IF channelizers, for which two suitable designs consisting of an eight-channel double-star-junction and a cochlea-like multiplexer, respectively, are devised. For experimental verification, two prototypes in microstrip and lumped-element technologies are developed and characterized.
{"title":"RF and IF channelizers for wide-band sensing in cognitive/Software-Defined-Radio receivers","authors":"J. P. Magalhães, J. Vieira, R. Gómez‐García, N. Carvalho","doi":"10.23919/EUMC.2012.6459265","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459265","url":null,"abstract":"This paper proposes an original architecture for a Software-Defined-Radio receiver based on an Hybrid Filter Bank. The key issue for its proper operation is the channelization of the incoming signal into multiple sub-bands, that is performed at two stages: radio-frequency (RF) and intermediate-frequency (IF) levels. Thus, low-cost analog-to-digital converters (ADCs) can be employed for the sampling of these sub-bands to be subsequently processed at the digital level for the overall signal reconstruction. Special attention is given to the RF and IF channelizers, for which two suitable designs consisting of an eight-channel double-star-junction and a cochlea-like multiplexer, respectively, are devised. For experimental verification, two prototypes in microstrip and lumped-element technologies are developed and characterized.","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":"130079677","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.2012.6459374
W. Alomar, A. Mortazawi
A novel design technique for a serially fed antenna array employing a negative group delay (NGD) circuit is reported. The NGD is generated using an antenna and a T-junction power divider. To the best of the authors' knowledge, this is the first demonstration of employing an antenna to generate NGD. The NGD circuit cancels out the positive group delay caused by the feed lines within the array. This results in beam squint elimination over the entire antenna operation bandwidth.
{"title":"Elimination of beam squint in serially fed arrays with negative group delay circuits incorporating antenna elements","authors":"W. Alomar, A. Mortazawi","doi":"10.23919/EUMC.2012.6459374","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459374","url":null,"abstract":"A novel design technique for a serially fed antenna array employing a negative group delay (NGD) circuit is reported. The NGD is generated using an antenna and a T-junction power divider. To the best of the authors' knowledge, this is the first demonstration of employing an antenna to generate NGD. The NGD circuit cancels out the positive group delay caused by the feed lines within the array. This results in beam squint elimination over the entire antenna operation 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":"115830799","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.2012.6459176
J. P. Guzman, S. Muhammad, M. Ney, C. Person
In this paper, a completely packaged solution is presented for high data rate radio front end operating around 60 GHz. A cylindrical dielectric resonator antenna is micromachined as a part of the package surrounding other active elements. This resonator is magnetically coupled to a nearby integrated coplanar-fed slotted dipole. Simulation results show a 6.1GHz impedance matching bandwidth (VSWR=2) with a gain greater than 5dBi throughout the entire bandwidth.
{"title":"Cylindrical dielectric resonator antenna excited by on-chip integrated slot for a completely packaged 60 GHz front-end solution","authors":"J. P. Guzman, S. Muhammad, M. Ney, C. Person","doi":"10.23919/EUMC.2012.6459176","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459176","url":null,"abstract":"In this paper, a completely packaged solution is presented for high data rate radio front end operating around 60 GHz. A cylindrical dielectric resonator antenna is micromachined as a part of the package surrounding other active elements. This resonator is magnetically coupled to a nearby integrated coplanar-fed slotted dipole. Simulation results show a 6.1GHz impedance matching bandwidth (VSWR=2) with a gain greater than 5dBi throughout the entire 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":"127123164","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.2012.6459214
K. Kawai, H. Okazaki, S. Narahashi
This paper proposes a novel tunable dual-band bandpass filter that can individually tune its center frequency and the bandwidth of its two passbands. The proposed filter comprises two tunable single-band filters and branch lines that achieve a nearly independent tuning capability of its center frequency and the bandwidth in each passband. In addition, when tuning the frequency characteristics of one passband the characteristics of the other passband are not significantly affected. To the best knowledge of the authors, this is the first dual-band bandpass filter with highly flexible tuning capabilities in the 5-GHz band.
{"title":"5-GHz-band center frequency and bandwidth tunable dual-band bandpass filter","authors":"K. Kawai, H. Okazaki, S. Narahashi","doi":"10.23919/EUMC.2012.6459214","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459214","url":null,"abstract":"This paper proposes a novel tunable dual-band bandpass filter that can individually tune its center frequency and the bandwidth of its two passbands. The proposed filter comprises two tunable single-band filters and branch lines that achieve a nearly independent tuning capability of its center frequency and the bandwidth in each passband. In addition, when tuning the frequency characteristics of one passband the characteristics of the other passband are not significantly affected. To the best knowledge of the authors, this is the first dual-band bandpass filter with highly flexible tuning capabilities in the 5-GHz band.","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":"129048096","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.2012.6459157
D. Penkin, G. Janssen, A. Yarovoy
An algorithm suitable to estimate the source node location in a large-scale wireless sensor network without relying on a particular network infrastructure is developed based on a discrete percolation approach. The algorithm's applicability is evaluated in terms of confidence intervals for the Gaussian distribution of hop count in a peripheral channel and cooperative routing effect is exploited to improve the localization approach.
{"title":"Source node location estimation in large-scale wireless sensor networks","authors":"D. Penkin, G. Janssen, A. Yarovoy","doi":"10.23919/EUMC.2012.6459157","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459157","url":null,"abstract":"An algorithm suitable to estimate the source node location in a large-scale wireless sensor network without relying on a particular network infrastructure is developed based on a discrete percolation approach. The algorithm's applicability is evaluated in terms of confidence intervals for the Gaussian distribution of hop count in a peripheral channel and cooperative routing effect is exploited to improve the localization approach.","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":"133595754","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.2012.6459258
M. Zucca, M. Ciattaglia, R. Pintauro, G. Valério, A. Galli
A novel compact, light-weight, and low-loss printed circuit based on hybrid rings is developed and tested for processing functionalities in radar applications. The circuit modularity and the design choices enable for the reduction both of the topological complexity of the beam forming network and of the relevant ohmic losses with consequent improvements in the antenna gain. At the same time, this circuit allows us to manage only two RF channels (instead of the conventional three) combining Delta and Omnidirectional channels with the possibility to modulate Omni-channel signal. After the design and simulation processes, two components have been built and measured, showing the expected valid performance.
{"title":"Compact and low-loss printed circuit based on hybrid rings for radar applications","authors":"M. Zucca, M. Ciattaglia, R. Pintauro, G. Valério, A. Galli","doi":"10.23919/EUMC.2012.6459258","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459258","url":null,"abstract":"A novel compact, light-weight, and low-loss printed circuit based on hybrid rings is developed and tested for processing functionalities in radar applications. The circuit modularity and the design choices enable for the reduction both of the topological complexity of the beam forming network and of the relevant ohmic losses with consequent improvements in the antenna gain. At the same time, this circuit allows us to manage only two RF channels (instead of the conventional three) combining Delta and Omnidirectional channels with the possibility to modulate Omni-channel signal. After the design and simulation processes, two components have been built and measured, showing the expected valid performance.","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":"122239498","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.2012.6459410
A. Rodriguez, V. Boria, J. Selga, F. Martín
In this work, a robust method for the automated synthesis of microstrip lines loaded with complementary split-ring resonators (CSRRs), starting from equivalent circuit models, is presented. Following this novel space mapping-based strategy, the initial estimated layout is already very close to the optimum final solution, thus achieving a fast and very soft convergence rate of the whole synthesis procedure. Additionally, this synthesis method is able to evaluate the suitability of the proposed microstrip technology for implementing any given target frequency response. For this purpose, the convergence region of this synthesis algorithm (related to the physical realization of the CSRRs loading the host microstrip line), is obtained following an aggressive space mapping (ASM) technique. For validation issues, three design examples are shown.
{"title":"A robust space mapping method for the practical synthesis of CSRR-based artificial transmission lines from equivalent circuit models","authors":"A. Rodriguez, V. Boria, J. Selga, F. Martín","doi":"10.23919/EUMC.2012.6459410","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459410","url":null,"abstract":"In this work, a robust method for the automated synthesis of microstrip lines loaded with complementary split-ring resonators (CSRRs), starting from equivalent circuit models, is presented. Following this novel space mapping-based strategy, the initial estimated layout is already very close to the optimum final solution, thus achieving a fast and very soft convergence rate of the whole synthesis procedure. Additionally, this synthesis method is able to evaluate the suitability of the proposed microstrip technology for implementing any given target frequency response. For this purpose, the convergence region of this synthesis algorithm (related to the physical realization of the CSRRs loading the host microstrip line), is obtained following an aggressive space mapping (ASM) technique. For validation issues, three design examples are shown.","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":"130532408","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.2012.6459242
Shiran Wang, Fu‐Chiarng Chen
Mushroom structure exhibits unique electromagnetic properties that have led to a wide range of application in microwave and antenna community. This paper focuses on the electromagnetic band-gap (EBG) characteristic of the mushroom structure with the suspending microstrip line, and a new concept of the mushroom interlaced periodic arrayal has proposed. By the simulated and measured results, it is verified that the mushroom structure with the suspending microstrip line can generate multi-band EBG characteristic. Moreover, we use the new concept to design a new triplexer circuit. The triplexer can integrate three kinds of communication systems with each other, which operate at frequencies including GSM 1800MHz, WiFi 2.45GHz, and WiMAX 3.5GHz, respectively.
{"title":"The multi-band EBG characteristic of the mushroom structure with the suspending microstrip line","authors":"Shiran Wang, Fu‐Chiarng Chen","doi":"10.23919/EUMC.2012.6459242","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459242","url":null,"abstract":"Mushroom structure exhibits unique electromagnetic properties that have led to a wide range of application in microwave and antenna community. This paper focuses on the electromagnetic band-gap (EBG) characteristic of the mushroom structure with the suspending microstrip line, and a new concept of the mushroom interlaced periodic arrayal has proposed. By the simulated and measured results, it is verified that the mushroom structure with the suspending microstrip line can generate multi-band EBG characteristic. Moreover, we use the new concept to design a new triplexer circuit. The triplexer can integrate three kinds of communication systems with each other, which operate at frequencies including GSM 1800MHz, WiFi 2.45GHz, and WiMAX 3.5GHz, respectively.","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":"131517910","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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