Pub Date : 2012-10-01DOI: 10.23919/EUMC.2012.6459324
P. Vizarreta, G. Montoro, P. Gilabert
This paper presents an envelope tracking (ET) Power Amplifier (PA) whose architecture includes an efficient Envelope Amplifier (EA) and a bandwidth reduction algorithm suitable for real time applications. The EA consists of a hybrid amplifier combining switched and linear amplification. A bandwidth and slew-rate reduction algorithm has been incorporated in order to allow wide-band envelope amplifications. Non-linearities introduced by the Hybrid EA (HEA) and the dynamic supply are compensated with Digital Pre-Distortion. The ET PA has been tested using 64-QAM signals and commercial devices. Results show that non-linearities produced by the HEA are compensable and that the architecture provides efficiency improvements compared to the conventional linear EA.
{"title":"Hybrid Envelope Amplifier for envelope tracking power amplifier transmitters","authors":"P. Vizarreta, G. Montoro, P. Gilabert","doi":"10.23919/EUMC.2012.6459324","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459324","url":null,"abstract":"This paper presents an envelope tracking (ET) Power Amplifier (PA) whose architecture includes an efficient Envelope Amplifier (EA) and a bandwidth reduction algorithm suitable for real time applications. The EA consists of a hybrid amplifier combining switched and linear amplification. A bandwidth and slew-rate reduction algorithm has been incorporated in order to allow wide-band envelope amplifications. Non-linearities introduced by the Hybrid EA (HEA) and the dynamic supply are compensated with Digital Pre-Distortion. The ET PA has been tested using 64-QAM signals and commercial devices. Results show that non-linearities produced by the HEA are compensable and that the architecture provides efficiency improvements compared to the conventional linear EA.","PeriodicalId":266910,"journal":{"name":"2012 42nd European Microwave Conference","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125627551","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.2012.6459195
P. Kozakowski, A. Deleniv
All-metal insert E-plane band-pass filter with asymmetric frequency response is presented. The extracted pole technique is used to introduce transmission zero. The proposed metal-insert E-plane extracted pole resonator is suitable for direct integration with straight waveguide section. An additional modification of the structure is offered which facilities the design process and makes practical implementation more feasible. The discussed structure provides solution for all-metal E-plane filters with two transmissions zeros of extracted pole variety and proves to be particularly useful in diplexer design. The concept was validated by designing and manufacturing a 4-order filter with a transmission zero located on the upper side of the pass-band.
{"title":"All metal insert E-plane filter with integrated extracted pole resonator","authors":"P. Kozakowski, A. Deleniv","doi":"10.23919/EUMC.2012.6459195","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459195","url":null,"abstract":"All-metal insert E-plane band-pass filter with asymmetric frequency response is presented. The extracted pole technique is used to introduce transmission zero. The proposed metal-insert E-plane extracted pole resonator is suitable for direct integration with straight waveguide section. An additional modification of the structure is offered which facilities the design process and makes practical implementation more feasible. The discussed structure provides solution for all-metal E-plane filters with two transmissions zeros of extracted pole variety and proves to be particularly useful in diplexer design. The concept was validated by designing and manufacturing a 4-order filter with a transmission zero located on the upper side of the pass-band.","PeriodicalId":266910,"journal":{"name":"2012 42nd European Microwave Conference","volume":" 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113952499","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.2012.6459127
Xuyang Li, Y. L. Sit, L. Zwirello, M. Jalilvand, T. Zwick
For the characterization of the antennas for medical diagnostics or implanted devices, an E-field probe based antenna measurement system is presented here. Since the devices work in the near-field range of the antenna, the near-field measurement of the antennas is performed. A liquid phantom, a mixture from PEG and water, is chosen to emulate different tissues with regards to their dielectric properties. The system is characterized from 0.5 GHz to 5 GHz with pattern measurement both in E- and H-plane of the antennas. The short measured distance of 4-6 cm between two antennas in the liquid phantom is maintained. Benefiting from the positioning system with high accuracy motors and the small size of the probe for capturing the E-fields, the measurement system exhibits an extremely reliable results of the near-field pattern.
{"title":"An E-field probe based near-field measurement system for on- and in-body antennas","authors":"Xuyang Li, Y. L. Sit, L. Zwirello, M. Jalilvand, T. Zwick","doi":"10.23919/EUMC.2012.6459127","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459127","url":null,"abstract":"For the characterization of the antennas for medical diagnostics or implanted devices, an E-field probe based antenna measurement system is presented here. Since the devices work in the near-field range of the antenna, the near-field measurement of the antennas is performed. A liquid phantom, a mixture from PEG and water, is chosen to emulate different tissues with regards to their dielectric properties. The system is characterized from 0.5 GHz to 5 GHz with pattern measurement both in E- and H-plane of the antennas. The short measured distance of 4-6 cm between two antennas in the liquid phantom is maintained. Benefiting from the positioning system with high accuracy motors and the small size of the probe for capturing the E-fields, the measurement system exhibits an extremely reliable results of the near-field pattern.","PeriodicalId":266910,"journal":{"name":"2012 42nd European Microwave Conference","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127885506","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.2012.6459300
A. K. Saxena, S. Kumar, K. V. Srivastava
This paper presents a compact fourth order based unconditionally stable 3-step locally one dimensional (LOD) finite difference time domain (FDTD) method. Dispersion analysis of the proposed method shows that due to the fourth order accuracy in space, compact fourth order 3-step LOD-FDTD method has less numerical dispersion error as compared to that of second order 3-step LOD-FDTD method.
{"title":"A compact fourth order 3-step LOD-FDTD method","authors":"A. K. Saxena, S. Kumar, K. V. Srivastava","doi":"10.23919/EUMC.2012.6459300","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459300","url":null,"abstract":"This paper presents a compact fourth order based unconditionally stable 3-step locally one dimensional (LOD) finite difference time domain (FDTD) method. Dispersion analysis of the proposed method shows that due to the fourth order accuracy in space, compact fourth order 3-step LOD-FDTD method has less numerical dispersion error as compared to that of second order 3-step LOD-FDTD method.","PeriodicalId":266910,"journal":{"name":"2012 42nd European Microwave Conference","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129302170","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.2012.6459423
G. Monti, L. Tarricone, M. Dionigi, M. Mongiardo
In this paper a wireless power transfer resonant link using inductive coupling is considered and analyzed on the basis of an artificial transmission line approach. More specifically, a periodic network consisting of inductively coupled LC resonators is studied. It is demonstrated that the analyzed system exhibits a pass-band characterized by negative effective parameters (i.e., a double negative pass-band). In order to validate the proposed approach, comparisons with experimental data and circuital simulations are reported and discussed.
{"title":"Magnetically coupled resonant wireless power transmission: An artificial transmission line approach","authors":"G. Monti, L. Tarricone, M. Dionigi, M. Mongiardo","doi":"10.23919/EUMC.2012.6459423","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459423","url":null,"abstract":"In this paper a wireless power transfer resonant link using inductive coupling is considered and analyzed on the basis of an artificial transmission line approach. More specifically, a periodic network consisting of inductively coupled LC resonators is studied. It is demonstrated that the analyzed system exhibits a pass-band characterized by negative effective parameters (i.e., a double negative pass-band). In order to validate the proposed approach, comparisons with experimental data and circuital simulations are reported and discussed.","PeriodicalId":266910,"journal":{"name":"2012 42nd European Microwave Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128467683","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.2012.6459379
A. Costanzo, F. Mastri, M. Dionigi, M. Mongiardo
In a wireless power transmission system the oscillator power is transmitted through resonant coils over variable distances. The simplest systems are realized with direct connection between the oscillator and the resonant coil. To improve the system performance one or more relay elements can be used. In order to take into account the resonant frequency variations, which also tune oscillation frequency, a broadband harmonic balance (HB) design of the system is carried out with the oscillator load including the resonant coupling and the rectifier. The oscillator efficiency, the RF-to-DC system efficiency and the DC power are then directly optimized for any coupling distance of interest. A Royer-type oscillator is designed and prototyped using the proposed technique. The oscillator exhibits 40 W and 75% conversion efficiency while the WPT system efficiency, DC-to-DC, is better than 60% for coupling distances of the order of 10 cm.
{"title":"Wireless resonant-type power transfer links with relay elements: Harmonic balance design","authors":"A. Costanzo, F. Mastri, M. Dionigi, M. Mongiardo","doi":"10.23919/EUMC.2012.6459379","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459379","url":null,"abstract":"In a wireless power transmission system the oscillator power is transmitted through resonant coils over variable distances. The simplest systems are realized with direct connection between the oscillator and the resonant coil. To improve the system performance one or more relay elements can be used. In order to take into account the resonant frequency variations, which also tune oscillation frequency, a broadband harmonic balance (HB) design of the system is carried out with the oscillator load including the resonant coupling and the rectifier. The oscillator efficiency, the RF-to-DC system efficiency and the DC power are then directly optimized for any coupling distance of interest. A Royer-type oscillator is designed and prototyped using the proposed technique. The oscillator exhibits 40 W and 75% conversion efficiency while the WPT system efficiency, DC-to-DC, is better than 60% for coupling distances of the order of 10 cm.","PeriodicalId":266910,"journal":{"name":"2012 42nd European Microwave Conference","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129176710","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.2012.6459230
N. Jeevanandham, Nasimuddin, K. Agarwal, A. Alphones
A dual-band, circularly polarized, hexagonal-shaped slot antenna is proposed and studied using microstrip feed with L-shaped stub. The antenna consists of a hexagonal-shaped slot with a microstrip feed and L-shaped stub. An impedance transformer is used to improve the impedance matching of the slot antenna. The slot and feeding structure are fabricated on a low cost FR4 substrate. The measured results of the antenna prototype are 15.7% (3.2-3.75 GHz)15.5% (4.42-5.1 GHz) for 3-dB axial ratio bandwidths and 8.6% (3.41-3.70 GHz)15.5% (4.47-5.20 GHz) for VSWR<;2 impedance bandwidths, respectively, for the 3.5 GHz and 4.5 GHz operating frequency bands. The measured gain is around 4.3 dBic for 3.5 GHz band and 3.0 dBic for 4.5 GHz band at the boresight.
{"title":"Dual-band circularly polarized hexagonal-slot antenna","authors":"N. Jeevanandham, Nasimuddin, K. Agarwal, A. Alphones","doi":"10.23919/EUMC.2012.6459230","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459230","url":null,"abstract":"A dual-band, circularly polarized, hexagonal-shaped slot antenna is proposed and studied using microstrip feed with L-shaped stub. The antenna consists of a hexagonal-shaped slot with a microstrip feed and L-shaped stub. An impedance transformer is used to improve the impedance matching of the slot antenna. The slot and feeding structure are fabricated on a low cost FR4 substrate. The measured results of the antenna prototype are 15.7% (3.2-3.75 GHz)15.5% (4.42-5.1 GHz) for 3-dB axial ratio bandwidths and 8.6% (3.41-3.70 GHz)15.5% (4.47-5.20 GHz) for VSWR<;2 impedance bandwidths, respectively, for the 3.5 GHz and 4.5 GHz operating frequency bands. The measured gain is around 4.3 dBic for 3.5 GHz band and 3.0 dBic for 4.5 GHz band at the boresight.","PeriodicalId":266910,"journal":{"name":"2012 42nd European Microwave Conference","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116876073","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.2012.6459180
S. Maddio, A. Cidronali, G. Manes
In this paper we propose a Direction of Arrival (DoA) positioning system based on a switched six-beams antenna operating in Circular Polarization at 2.45 GHz. The system is intended to operate 1D localization of generic device equipped with a common monopole antenna. The DoA estimation is possible regardless of the target antenna orientation. The system operates in circular polarization and it is designed to work without any form of calibration. We demonstrate that, in an anechoic setup, the mean errors for the DoA estimations are around 5 or 6 degrees for a wide range of target antenna orientations, while not exceed 11 degrees even in the worst case of deep fading. When operating in a complex indoor environment, the localization performance slightly degrades, but the reported experiments demonstrate that the average error is still under 10 degrees for the most common cases.
{"title":"Direction of Arrival estimation of an arbitrary oriented targets by a highly directive antenna and coarse RSSI data","authors":"S. Maddio, A. Cidronali, G. Manes","doi":"10.23919/EUMC.2012.6459180","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459180","url":null,"abstract":"In this paper we propose a Direction of Arrival (DoA) positioning system based on a switched six-beams antenna operating in Circular Polarization at 2.45 GHz. The system is intended to operate 1D localization of generic device equipped with a common monopole antenna. The DoA estimation is possible regardless of the target antenna orientation. The system operates in circular polarization and it is designed to work without any form of calibration. We demonstrate that, in an anechoic setup, the mean errors for the DoA estimations are around 5 or 6 degrees for a wide range of target antenna orientations, while not exceed 11 degrees even in the worst case of deep fading. When operating in a complex indoor environment, the localization performance slightly degrades, but the reported experiments demonstrate that the average error is still under 10 degrees for the most common cases.","PeriodicalId":266910,"journal":{"name":"2012 42nd European Microwave Conference","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115660776","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.2012.6459309
Y. Okita, F. Kuroki, Y. Kawahara
The tri-plate transmission line is usually fabricated by etching copper-coated dielectric substrates to support the center conductor. However, the dielectric loss of the dielectric substrates is no longer negligible increasing operational frequencies, and this fact causes difficulty for loss reduction of filters at millimeter-wave frequencies. With this in mind, the tri-plate transmission line structure to be able to support the center conductor without the dielectric substrates was devised and a bandpass filter made by only metal strip was designed and fabricated as a trial at 30 GHz.
{"title":"Design on fish-bone shaped tri-plate transmission line filter at millimeter wave lengths","authors":"Y. Okita, F. Kuroki, Y. Kawahara","doi":"10.23919/EUMC.2012.6459309","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459309","url":null,"abstract":"The tri-plate transmission line is usually fabricated by etching copper-coated dielectric substrates to support the center conductor. However, the dielectric loss of the dielectric substrates is no longer negligible increasing operational frequencies, and this fact causes difficulty for loss reduction of filters at millimeter-wave frequencies. With this in mind, the tri-plate transmission line structure to be able to support the center conductor without the dielectric substrates was devised and a bandpass filter made by only metal strip was designed and fabricated as a trial at 30 GHz.","PeriodicalId":266910,"journal":{"name":"2012 42nd European Microwave Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115764974","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.2012.6459254
C. Baer, T. Musch, M. Vogt
In this contribution a measurement concept, named pseudo transmission method, is presented. It aimes at volume fraction determination in multi phase flows which is a relevant physical quantity for the mass flow determination in latter systems. Fundamentals concerning the material composition as well as necessary mixing equations for effective permittivities are investigated, discussed and adopted to the pseudo transmission measurement concept. In addition a transpolarizing reflector, which is essential for the pseudo transmission measurement method is discussed and evaluated in electromagnetic simulations. The proposed monitoring concept is validated in various electromagnetic field simulations. Finally, measurements that were performed with a calibrated vector network analyzer on plastic phantoms inserted into a glass tube are presented and discussed in detail.
{"title":"Volume fraction determination in pneumatic conveying systems by means of the pseudo transmission measurement concept using a transpolarizing reflector","authors":"C. Baer, T. Musch, M. Vogt","doi":"10.23919/EUMC.2012.6459254","DOIUrl":"https://doi.org/10.23919/EUMC.2012.6459254","url":null,"abstract":"In this contribution a measurement concept, named pseudo transmission method, is presented. It aimes at volume fraction determination in multi phase flows which is a relevant physical quantity for the mass flow determination in latter systems. Fundamentals concerning the material composition as well as necessary mixing equations for effective permittivities are investigated, discussed and adopted to the pseudo transmission measurement concept. In addition a transpolarizing reflector, which is essential for the pseudo transmission measurement method is discussed and evaluated in electromagnetic simulations. The proposed monitoring concept is validated in various electromagnetic field simulations. Finally, measurements that were performed with a calibrated vector network analyzer on plastic phantoms inserted into a glass tube are presented and discussed in detail.","PeriodicalId":266910,"journal":{"name":"2012 42nd European Microwave Conference","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114856237","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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