Pub Date : 2008-06-15DOI: 10.1109/MWSYM.2008.4633236
J. Corral, R. Sambaraju, M. Piqueras, V. Polo
A novel photonic vector modulator architecture for generating pure quadrature amplitude modulation (QAM) signals is presented. No electrical devices apart from the local oscillator are needed in the generation process. Both binary and multilevel digital signals can be used to generate quadrature phase shift keying (QPSK) or multilevel QAM (M-QAM) digital modulations at any carrier frequency. A pure 2.5Gb/s 16-QAM signal has been experimentally generated at a 42 GHz carrier frequency.
{"title":"Pure 2.5 Gb/s 16-QAM signal generation with photonic vector modulator","authors":"J. Corral, R. Sambaraju, M. Piqueras, V. Polo","doi":"10.1109/MWSYM.2008.4633236","DOIUrl":"https://doi.org/10.1109/MWSYM.2008.4633236","url":null,"abstract":"A novel photonic vector modulator architecture for generating pure quadrature amplitude modulation (QAM) signals is presented. No electrical devices apart from the local oscillator are needed in the generation process. Both binary and multilevel digital signals can be used to generate quadrature phase shift keying (QPSK) or multilevel QAM (M-QAM) digital modulations at any carrier frequency. A pure 2.5Gb/s 16-QAM signal has been experimentally generated at a 42 GHz carrier frequency.","PeriodicalId":273767,"journal":{"name":"2008 IEEE MTT-S International Microwave Symposium Digest","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133345797","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 : 2008-06-15DOI: 10.1109/MWSYM.2008.4632939
S. Liberatoscioli, M. Mattes, M. Guglielmi, D. Schmitt, C. Ernst
In this paper an innovative manufacturing technology is presented that combines electroforming and CFRP (Carbon Fiber Reinforced Plastic) application and thus could be an enabling technology to achieve tuningless lightweight RF passive hardware with complex geometries. In order to demonstrate the performances achievable with this manufacturing process, a highly sensitive 0.14% fractional bandwidth dual mode filter centered at 19.8GHz was fabricated and tested. The flange interface of the filter was an integral part of the hardware and the total weight four times lighter than an equivalent part made from INVAR.
{"title":"Innovative manufacturing technology for RF Passive devices combining electroforming and CFRP application","authors":"S. Liberatoscioli, M. Mattes, M. Guglielmi, D. Schmitt, C. Ernst","doi":"10.1109/MWSYM.2008.4632939","DOIUrl":"https://doi.org/10.1109/MWSYM.2008.4632939","url":null,"abstract":"In this paper an innovative manufacturing technology is presented that combines electroforming and CFRP (Carbon Fiber Reinforced Plastic) application and thus could be an enabling technology to achieve tuningless lightweight RF passive hardware with complex geometries. In order to demonstrate the performances achievable with this manufacturing process, a highly sensitive 0.14% fractional bandwidth dual mode filter centered at 19.8GHz was fabricated and tested. The flange interface of the filter was an integral part of the hardware and the total weight four times lighter than an equivalent part made from INVAR.","PeriodicalId":273767,"journal":{"name":"2008 IEEE MTT-S International Microwave Symposium Digest","volume":"10 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120985037","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 : 2008-06-15DOI: 10.1109/MWSYM.2008.4633006
L. Hady, D. Kajfez, A. Kishk
A new concept of dual mode operation for oscillation and radiation characteristics using single dielectric resonator enclosed by modified rectangular cavity has been developed in this paper. High unloaded quality factor of 2700 at 2.54 GHz and omni-directional radiation patterns with radiation bandwidth of 5.13% around 3.31 GHz were achieved simultaneously. The high-Q mode is coupled to a microstrip line and the low-Q mode is coupled to a coaxial probe with capacitive plate. Measurements of the scattering parameters and of the radiating patterns were carried out to verify the simulation results.
{"title":"Dual function of a dielectric resonator: A high-Q resonator and a low-Q radiator","authors":"L. Hady, D. Kajfez, A. Kishk","doi":"10.1109/MWSYM.2008.4633006","DOIUrl":"https://doi.org/10.1109/MWSYM.2008.4633006","url":null,"abstract":"A new concept of dual mode operation for oscillation and radiation characteristics using single dielectric resonator enclosed by modified rectangular cavity has been developed in this paper. High unloaded quality factor of 2700 at 2.54 GHz and omni-directional radiation patterns with radiation bandwidth of 5.13% around 3.31 GHz were achieved simultaneously. The high-Q mode is coupled to a microstrip line and the low-Q mode is coupled to a coaxial probe with capacitive plate. Measurements of the scattering parameters and of the radiating patterns were carried out to verify the simulation results.","PeriodicalId":273767,"journal":{"name":"2008 IEEE MTT-S International Microwave Symposium Digest","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114930815","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 : 2008-06-15DOI: 10.1109/MWSYM.2008.4633081
J. Buckwalter
High-speed digital signal integrity is strongly limited by microwave reflections, which degrade the reliability of a serial link. This work describes the relationship between the reflections and attenuation that occur along interconnects and the signal integrity. Bounds on ISI and DDJ resulting from reflections and attenuation quantify system design of link jitter budgets. This paper demonstrates analytical methods to quickly deduce the signal integrity penalty of transmission line discontinuities.
{"title":"Signal integrity in reflection-limited channels","authors":"J. Buckwalter","doi":"10.1109/MWSYM.2008.4633081","DOIUrl":"https://doi.org/10.1109/MWSYM.2008.4633081","url":null,"abstract":"High-speed digital signal integrity is strongly limited by microwave reflections, which degrade the reliability of a serial link. This work describes the relationship between the reflections and attenuation that occur along interconnects and the signal integrity. Bounds on ISI and DDJ resulting from reflections and attenuation quantify system design of link jitter budgets. This paper demonstrates analytical methods to quickly deduce the signal integrity penalty of transmission line discontinuities.","PeriodicalId":273767,"journal":{"name":"2008 IEEE MTT-S International Microwave Symposium Digest","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115371428","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 : 2008-06-15DOI: 10.1109/MWSYM.2008.4633191
A. Alghanim, J. Lees, T. Williams, J. Benedikt, P. Tasker
The usual approach in minimizing electrical memory in PA design is to terminate base-band impedances into a broadband short circuit, usually provided in the form of an array of bypass capacitors attached close to the output terminal of the device. This paper investigates the validity of this approach and compares linearity performance under different IF impedance terminations. Active IF load-pull is used as a modulation-frequency independent means of engineering the significant low-frequency IF voltage components generated as a result of two-tone excitation. Selective IF loads are presented in order to probe device linearity as a function of IF impedance. One significant observation is the existence of specific IF loads that result in the suppression of both IM3 and IM5 intermodulation components by more than 16dB and 10dB respectively, in comparison to the case of a conventional IF short termination. These investigations are performed using a 20W LDMOS device characterised at 2.1 GHz within a purpose built, high-power measurement system.
{"title":"Reduction of electrical baseband memory effect in high-power LDMOS devices using optimum termination for IMD3 and IMD5 using active load-pull","authors":"A. Alghanim, J. Lees, T. Williams, J. Benedikt, P. Tasker","doi":"10.1109/MWSYM.2008.4633191","DOIUrl":"https://doi.org/10.1109/MWSYM.2008.4633191","url":null,"abstract":"The usual approach in minimizing electrical memory in PA design is to terminate base-band impedances into a broadband short circuit, usually provided in the form of an array of bypass capacitors attached close to the output terminal of the device. This paper investigates the validity of this approach and compares linearity performance under different IF impedance terminations. Active IF load-pull is used as a modulation-frequency independent means of engineering the significant low-frequency IF voltage components generated as a result of two-tone excitation. Selective IF loads are presented in order to probe device linearity as a function of IF impedance. One significant observation is the existence of specific IF loads that result in the suppression of both IM3 and IM5 intermodulation components by more than 16dB and 10dB respectively, in comparison to the case of a conventional IF short termination. These investigations are performed using a 20W LDMOS device characterised at 2.1 GHz within a purpose built, high-power measurement system.","PeriodicalId":273767,"journal":{"name":"2008 IEEE MTT-S International Microwave Symposium Digest","volume":"212 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115460353","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 : 2008-06-15DOI: 10.1109/MWSYM.2008.4632984
A. Traille, Li Yang, A. Rida, M. Tentzeris
The performance of the most commonly used metal antennas close to the human body is one of the limiting factors of the performance of bio-sensors and wireless body area networks (WBAN). Due to the high dielectric and conductivity contrast with respect to most parts of the human body (blood, skin, …), the range of most of the wireless sensors operating in RF and microwave frequencies is limited to 1–2 cm when attached to the body. In this paper, we introduce the very novel idea of liquid antennas, that is based on engineering the properties of liquids. This approach allows for the improvement of the range by a factor of 5–10 in a very easy-to-realize way, just modifying the salinity of the aqueous solution of the antenna. A similar methodology can be extended to the development of liquid RF electronics for implantable devices and wearable real-time bio-signal monitoring, since it can potentially lead to very flexible antenna and electronic configurations.
{"title":"A novel liquid antenna for wearable bio-monitoring applications","authors":"A. Traille, Li Yang, A. Rida, M. Tentzeris","doi":"10.1109/MWSYM.2008.4632984","DOIUrl":"https://doi.org/10.1109/MWSYM.2008.4632984","url":null,"abstract":"The performance of the most commonly used metal antennas close to the human body is one of the limiting factors of the performance of bio-sensors and wireless body area networks (WBAN). Due to the high dielectric and conductivity contrast with respect to most parts of the human body (blood, skin, …), the range of most of the wireless sensors operating in RF and microwave frequencies is limited to 1–2 cm when attached to the body. In this paper, we introduce the very novel idea of liquid antennas, that is based on engineering the properties of liquids. This approach allows for the improvement of the range by a factor of 5–10 in a very easy-to-realize way, just modifying the salinity of the aqueous solution of the antenna. A similar methodology can be extended to the development of liquid RF electronics for implantable devices and wearable real-time bio-signal monitoring, since it can potentially lead to very flexible antenna and electronic configurations.","PeriodicalId":273767,"journal":{"name":"2008 IEEE MTT-S International Microwave Symposium Digest","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116607009","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 : 2008-06-15DOI: 10.1109/MWSYM.2008.4632914
A. Ezzeddine, Ho-Chung Huang
We report the design and performance of an ultra-broadband power amplifier. It achieves 10 Watts output power with 21dB ± 1.5dB gain from 20 MHz to 3000 MHz. At lower frequencies from 20 to 1000 MHz the output power is 15 Watts with 22% efficiency. To achieve this performance, we employ a new design concept to control the device impedance and the power combiner impedance to be naturally 50 Ohms, such that no impedance matching is needed. Also, we developed a broadband microwave balun as a push-pull power combiner, which doubles as an impedance transformer. We believe the combination of output power, bandwidth and efficiency is the best reported to date.
{"title":"10W ultra-broadband power amplifier","authors":"A. Ezzeddine, Ho-Chung Huang","doi":"10.1109/MWSYM.2008.4632914","DOIUrl":"https://doi.org/10.1109/MWSYM.2008.4632914","url":null,"abstract":"We report the design and performance of an ultra-broadband power amplifier. It achieves 10 Watts output power with 21dB ± 1.5dB gain from 20 MHz to 3000 MHz. At lower frequencies from 20 to 1000 MHz the output power is 15 Watts with 22% efficiency. To achieve this performance, we employ a new design concept to control the device impedance and the power combiner impedance to be naturally 50 Ohms, such that no impedance matching is needed. Also, we developed a broadband microwave balun as a push-pull power combiner, which doubles as an impedance transformer. We believe the combination of output power, bandwidth and efficiency is the best reported to date.","PeriodicalId":273767,"journal":{"name":"2008 IEEE MTT-S International Microwave Symposium Digest","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115070448","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 : 2008-06-15DOI: 10.1109/MWSYM.2008.4633300
Ki Jin Han, M. Swaminathan, E. Engin
For wideband modeling of large and complicated three-dimensional interconnects, this paper proposes an efficiency improvement in solving electric field integral equation with cylindrical conduction mode basis functions. Based on the multifunction method, the improved method reduces computational cost by using smaller number of higher-order basis functions for computing mutual inductances between far-separated conductors. From the modeling examples of through-hole vias and bonding wires in stacked IC’s, the proposed method is verified for application to real three-dimensional interconnects.
{"title":"Wideband electrical modeling of large three-dimensional interconnects using accelerated generation of partial impedances with cylindrical conduction mode basis functions","authors":"Ki Jin Han, M. Swaminathan, E. Engin","doi":"10.1109/MWSYM.2008.4633300","DOIUrl":"https://doi.org/10.1109/MWSYM.2008.4633300","url":null,"abstract":"For wideband modeling of large and complicated three-dimensional interconnects, this paper proposes an efficiency improvement in solving electric field integral equation with cylindrical conduction mode basis functions. Based on the multifunction method, the improved method reduces computational cost by using smaller number of higher-order basis functions for computing mutual inductances between far-separated conductors. From the modeling examples of through-hole vias and bonding wires in stacked IC’s, the proposed method is verified for application to real three-dimensional interconnects.","PeriodicalId":273767,"journal":{"name":"2008 IEEE MTT-S International Microwave Symposium Digest","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115653135","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 : 2008-06-15DOI: 10.1109/MWSYM.2008.4633258
H. Grubinger, H. Barth, R. Vahldieck
This paper introduces a novel 30 GHz turnstile coupler design which is very compact, exhibits low losses and can be manufactured at low cost. The turnstile coupler is modular and allows the implementation of amplifiers as highly integrated millimeter wave power combiners. The achievable bandwidth is approximately 20%.
{"title":"A low-loss, wideband combiner for power amplification at Ka-band frequencies","authors":"H. Grubinger, H. Barth, R. Vahldieck","doi":"10.1109/MWSYM.2008.4633258","DOIUrl":"https://doi.org/10.1109/MWSYM.2008.4633258","url":null,"abstract":"This paper introduces a novel 30 GHz turnstile coupler design which is very compact, exhibits low losses and can be manufactured at low cost. The turnstile coupler is modular and allows the implementation of amplifiers as highly integrated millimeter wave power combiners. The achievable bandwidth is approximately 20%.","PeriodicalId":273767,"journal":{"name":"2008 IEEE MTT-S International Microwave Symposium Digest","volume":"134 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123220419","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 : 2008-06-15DOI: 10.1109/MWSYM.2008.4633042
J. Reynoso‐Hernández, J. E. Zuniga-Juarez, A. Zarate-de Landa
This paper presents a new method for calculating the gate resistance Rg and inductance Lg, of GaN HEMTs. The method consists in forward biasing the gate with low Igs currents (Igs≫0; 0≪Vgs≪Vbi; drain open) and is based on the extrema of Z11 curves. Rg and Lg are determined from the extrema of Z11 curves measured (after conversion of S to Z parameters) at single DC gate forward current. This new method differs from those previously published [3,6] in that it avoids the use of the resonance frequency in the imaginary part of Z11 and the large DC gate forward current. The good agreement between experimental and model data confirms the validity of the proposed method.
{"title":"A new method for determining the gate resistance and inductance of GaN HEMTs based on the extrema points of Z11 curves","authors":"J. Reynoso‐Hernández, J. E. Zuniga-Juarez, A. Zarate-de Landa","doi":"10.1109/MWSYM.2008.4633042","DOIUrl":"https://doi.org/10.1109/MWSYM.2008.4633042","url":null,"abstract":"This paper presents a new method for calculating the gate resistance R<inf>g</inf> and inductance L<inf>g</inf>, of GaN HEMTs. The method consists in forward biasing the gate with low I<inf>gs</inf> currents (I<inf>gs</inf>≫0; 0≪V<inf>gs</inf>≪V<inf>bi</inf>; drain open) and is based on the extrema of Z<inf>11</inf> curves. R<inf>g</inf> and L<inf>g</inf> are determined from the extrema of Z<inf>11</inf> curves measured (after conversion of S to Z parameters) at single DC gate forward current. This new method differs from those previously published [3,6] in that it avoids the use of the resonance frequency in the imaginary part of Z<inf>11</inf> and the large DC gate forward current. The good agreement between experimental and model data confirms the validity of the proposed method.","PeriodicalId":273767,"journal":{"name":"2008 IEEE MTT-S International Microwave Symposium Digest","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125173830","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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