Pub Date : 2000-06-11DOI: 10.1109/MWSYM.2000.863560
I. Ohta, T. Kawai, Y. Kokubo
This paper presents a design method of a reversed-phase hybrid ring based on the equivalent admittance approach, and successfully designs a very miniature hybrid ring with a 0.28-wavelength or less circumference by adding shunt capacitors at each port as a matching element. The present hybrid has a broad bandwidth comparable to the regular reversed-phase hybrid ring. The validity and usefulness of the design are demonstrated by electromagnetic simulation for a uniplanar hybrid.
{"title":"A very-small-sized reversed-phase hybrid ring","authors":"I. Ohta, T. Kawai, Y. Kokubo","doi":"10.1109/MWSYM.2000.863560","DOIUrl":"https://doi.org/10.1109/MWSYM.2000.863560","url":null,"abstract":"This paper presents a design method of a reversed-phase hybrid ring based on the equivalent admittance approach, and successfully designs a very miniature hybrid ring with a 0.28-wavelength or less circumference by adding shunt capacitors at each port as a matching element. The present hybrid has a broad bandwidth comparable to the regular reversed-phase hybrid ring. The validity and usefulness of the design are demonstrated by electromagnetic simulation for a uniplanar hybrid.","PeriodicalId":149404,"journal":{"name":"2000 IEEE MTT-S International Microwave Symposium Digest (Cat. No.00CH37017)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122135992","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 : 2000-06-11DOI: 10.1109/MWSYM.2000.862339
Y.K. Verma, A. Verma
A new method is proposed for the accurate determination of the dielectric constant of the planar substrate materials. This method makes use of accurate determination of resonance frequency of a microstrip patch using the Modified Wolff Model (MWM). Accuracy and limitation of the MWM for calculation of resonance frequency of a rectangular patch are examined by comparing the computed resonance frequency with the measured resonance frequency for several patches both on low and on high dielectric constant substrates. An MWM based algorithm has been developed to extract value of the dielectric constant of the substrate from the measured resonance frequency anal accurate dimension of the patch. A sensitivity analysis has also been performed to explain the error in determination of dielectric constant due to errors in dimensions of the patch, thickness of substrate and measured resonance frequency. Our experimental results show that the accuracy of the proposed method is better than 1% for determination of dielectric constant of substrates.
{"title":"Accurate determination of dielectric constant of substrate materials using modified Wolff model","authors":"Y.K. Verma, A. Verma","doi":"10.1109/MWSYM.2000.862339","DOIUrl":"https://doi.org/10.1109/MWSYM.2000.862339","url":null,"abstract":"A new method is proposed for the accurate determination of the dielectric constant of the planar substrate materials. This method makes use of accurate determination of resonance frequency of a microstrip patch using the Modified Wolff Model (MWM). Accuracy and limitation of the MWM for calculation of resonance frequency of a rectangular patch are examined by comparing the computed resonance frequency with the measured resonance frequency for several patches both on low and on high dielectric constant substrates. An MWM based algorithm has been developed to extract value of the dielectric constant of the substrate from the measured resonance frequency anal accurate dimension of the patch. A sensitivity analysis has also been performed to explain the error in determination of dielectric constant due to errors in dimensions of the patch, thickness of substrate and measured resonance frequency. Our experimental results show that the accuracy of the proposed method is better than 1% for determination of dielectric constant of substrates.","PeriodicalId":149404,"journal":{"name":"2000 IEEE MTT-S International Microwave Symposium Digest (Cat. No.00CH37017)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122750421","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 : 2000-06-11DOI: 10.1109/MWSYM.2000.860889
E. Ngoya, N. Gallou, J. Nebus, H. Buret, P. Reig
Accurate system level simulation is indispensable for efficient RF communication system design. However system level models of nonlinear circuits are today very limited by their inability to handle nonlinear memory effects. The paper describes a new approach of system-level modeling which accounts efficiently for nonlinear envelope memory effects of wideband amplifiers, multipliers and mixers.
{"title":"Accurate RF and microwave system level modeling of wideband nonlinear circuits","authors":"E. Ngoya, N. Gallou, J. Nebus, H. Buret, P. Reig","doi":"10.1109/MWSYM.2000.860889","DOIUrl":"https://doi.org/10.1109/MWSYM.2000.860889","url":null,"abstract":"Accurate system level simulation is indispensable for efficient RF communication system design. However system level models of nonlinear circuits are today very limited by their inability to handle nonlinear memory effects. The paper describes a new approach of system-level modeling which accounts efficiently for nonlinear envelope memory effects of wideband amplifiers, multipliers and mixers.","PeriodicalId":149404,"journal":{"name":"2000 IEEE MTT-S International Microwave Symposium Digest (Cat. No.00CH37017)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122799572","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 : 2000-06-11DOI: 10.1109/MWSYM.2000.860955
T. Namiki
We previously introduced an unconditionally stable FDTD algorithm for a two-dimensional TE wave. This algorithm is based on the alternating-direction implicit (ADI) method, so we have called this new algorithm the ADI-FDTD method. We analytically and numerically verified that the algorithm of this method is free from the Courant-Friedrich-Levy condition restraint. In this paper, we extend this approach to a full three-dimensional wave. Numerical formulations are presented and simulation results are compared to those using the conventional FDTD method.
{"title":"Unconditionally stable FDTD algorithm for solving three-dimensional Maxwell's equations","authors":"T. Namiki","doi":"10.1109/MWSYM.2000.860955","DOIUrl":"https://doi.org/10.1109/MWSYM.2000.860955","url":null,"abstract":"We previously introduced an unconditionally stable FDTD algorithm for a two-dimensional TE wave. This algorithm is based on the alternating-direction implicit (ADI) method, so we have called this new algorithm the ADI-FDTD method. We analytically and numerically verified that the algorithm of this method is free from the Courant-Friedrich-Levy condition restraint. In this paper, we extend this approach to a full three-dimensional wave. Numerical formulations are presented and simulation results are compared to those using the conventional FDTD method.","PeriodicalId":149404,"journal":{"name":"2000 IEEE MTT-S International Microwave Symposium Digest (Cat. No.00CH37017)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125330513","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 : 2000-06-11DOI: 10.1109/MWSYM.2000.862317
T. Berceli, S. Kudszus, M. Schlechtweg, A. Zolomy, G. Járó, T. Marozsák, E. Udvary
New methods for optical millimeter wave generation are presented. They apply a harmonic oscillator stabilized to an optically transmitted subharmonic reference signal by a frequency division PLL. A 94 GHz signal was generated using both injection and phase locking techniques. The new approaches utilize inexpensive photonic components and exhibit low sensitivity to the fiber dispersion.
{"title":"Optical millimeter wave generation utilizing a subharmonic reference","authors":"T. Berceli, S. Kudszus, M. Schlechtweg, A. Zolomy, G. Járó, T. Marozsák, E. Udvary","doi":"10.1109/MWSYM.2000.862317","DOIUrl":"https://doi.org/10.1109/MWSYM.2000.862317","url":null,"abstract":"New methods for optical millimeter wave generation are presented. They apply a harmonic oscillator stabilized to an optically transmitted subharmonic reference signal by a frequency division PLL. A 94 GHz signal was generated using both injection and phase locking techniques. The new approaches utilize inexpensive photonic components and exhibit low sensitivity to the fiber dispersion.","PeriodicalId":149404,"journal":{"name":"2000 IEEE MTT-S International Microwave Symposium Digest (Cat. No.00CH37017)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125534399","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 : 2000-06-11DOI: 10.1109/MWSYM.2000.862234
W.N. Mwema, G. Kompa
An automatic technique for determining starting values for the parasitic elements of a distributed 18 element FET directly from pinched cold FET S-parameters is described. Optimization results using this technique are presented and show that the starting vector is very close to the solution. The approach is discussed on the basis of synthesized and measured S-parameter data.
{"title":"A new simplified and reliable HEMT modelling approach using pinched cold FET S-parameters","authors":"W.N. Mwema, G. Kompa","doi":"10.1109/MWSYM.2000.862234","DOIUrl":"https://doi.org/10.1109/MWSYM.2000.862234","url":null,"abstract":"An automatic technique for determining starting values for the parasitic elements of a distributed 18 element FET directly from pinched cold FET S-parameters is described. Optimization results using this technique are presented and show that the starting vector is very close to the solution. The approach is discussed on the basis of synthesized and measured S-parameter data.","PeriodicalId":149404,"journal":{"name":"2000 IEEE MTT-S International Microwave Symposium Digest (Cat. No.00CH37017)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126243957","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 : 2000-06-11DOI: 10.1109/MWSYM.2000.862255
A. Bracale, D. Pasquet, J. Gautier, N. Fel, V. Ferlet, J. Pelloie
This paper presents a new method to straightforwardly estimate the characteristic impedance of transmission lines printed on lossy substrate, and to accurately model transition between two calibrations. Other original points consist of the determination of parasitic elements included in these transitions, and in a clear assessment of the validity of the results.
{"title":"A new method for characteristic impedance determination on lossy substrate","authors":"A. Bracale, D. Pasquet, J. Gautier, N. Fel, V. Ferlet, J. Pelloie","doi":"10.1109/MWSYM.2000.862255","DOIUrl":"https://doi.org/10.1109/MWSYM.2000.862255","url":null,"abstract":"This paper presents a new method to straightforwardly estimate the characteristic impedance of transmission lines printed on lossy substrate, and to accurately model transition between two calibrations. Other original points consist of the determination of parasitic elements included in these transitions, and in a clear assessment of the validity of the results.","PeriodicalId":149404,"journal":{"name":"2000 IEEE MTT-S International Microwave Symposium Digest (Cat. No.00CH37017)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125765825","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 : 2000-06-11DOI: 10.1109/MWSYM.2000.863546
Chun-Lin Liao, C. Chen
A novel edge-coupled coplanar-waveguide (CPW) structure with finite-extent backed conductor is proposed. Based on the full-wave analysis, the effective dielectric constants and characteristic impedances of odd and even CPW modes are characterized, together with the associated coupling coefficients. The electric field distributions of these two modes are also presented.
{"title":"Full-wave characterization of an edge-coupled coplanar-waveguide structure with backed conductor","authors":"Chun-Lin Liao, C. Chen","doi":"10.1109/MWSYM.2000.863546","DOIUrl":"https://doi.org/10.1109/MWSYM.2000.863546","url":null,"abstract":"A novel edge-coupled coplanar-waveguide (CPW) structure with finite-extent backed conductor is proposed. Based on the full-wave analysis, the effective dielectric constants and characteristic impedances of odd and even CPW modes are characterized, together with the associated coupling coefficients. The electric field distributions of these two modes are also presented.","PeriodicalId":149404,"journal":{"name":"2000 IEEE MTT-S International Microwave Symposium Digest (Cat. No.00CH37017)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125777560","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 : 2000-06-11DOI: 10.1109/MWSYM.2000.862367
K. Itoh, T. Katsura, H. Nagano, T. Yamaguchi, Y. Hamade, M. Shimozawa, N. Suematsu, R. Hayashi, W. Palmer, M. Goldfarb
A 2 GHz band even harmonic type direct conversion receiver (EH-DCR) is proposed for the W-CDMA mobile terminal. Because of the well-matched anti-parallel diode pair used in the proposed EH-DCR, the receiver can reduce even order mixing products that degrade sensitivity characteristics. Also the proposed EH-DCR can achieve low current consumption with a passive mixer approach. In this paper, the overall receiver with an RF block, an analog baseband IC (ABB-IC) and a demodulator is demonstrated to indicate the effectiveness on the proposed RF architecture. The described evaluation results indicate high instantaneous dynamic range with high sensitivity.
{"title":"2 GHz band even harmonic type direct conversion receiver with ABB-IC for W-CDMA mobile terminal","authors":"K. Itoh, T. Katsura, H. Nagano, T. Yamaguchi, Y. Hamade, M. Shimozawa, N. Suematsu, R. Hayashi, W. Palmer, M. Goldfarb","doi":"10.1109/MWSYM.2000.862367","DOIUrl":"https://doi.org/10.1109/MWSYM.2000.862367","url":null,"abstract":"A 2 GHz band even harmonic type direct conversion receiver (EH-DCR) is proposed for the W-CDMA mobile terminal. Because of the well-matched anti-parallel diode pair used in the proposed EH-DCR, the receiver can reduce even order mixing products that degrade sensitivity characteristics. Also the proposed EH-DCR can achieve low current consumption with a passive mixer approach. In this paper, the overall receiver with an RF block, an analog baseband IC (ABB-IC) and a demodulator is demonstrated to indicate the effectiveness on the proposed RF architecture. The described evaluation results indicate high instantaneous dynamic range with high sensitivity.","PeriodicalId":149404,"journal":{"name":"2000 IEEE MTT-S International Microwave Symposium Digest (Cat. No.00CH37017)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125810663","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 : 2000-06-11DOI: 10.1109/MWSYM.2000.863534
Elise C. Fear, M. Stuchly
A system for microwave breast cancer detection is described, further extending ideas from the previously introduced technique of microwave confocal imaging. The breast is immersed in a liquid with electrical properties similar to skin or breast tissue, but of low loss. The characteristics of resistively loaded dipole antennas in the immersion media are investigated. The influences of the number of antennas and immersion medium on reconstructed images are examined. Results indicate successful detection of 6 mm diameter tumors with both immersion media, and larger tumor returns with the system immersed in skin.
{"title":"Microwave breast cancer detection","authors":"Elise C. Fear, M. Stuchly","doi":"10.1109/MWSYM.2000.863534","DOIUrl":"https://doi.org/10.1109/MWSYM.2000.863534","url":null,"abstract":"A system for microwave breast cancer detection is described, further extending ideas from the previously introduced technique of microwave confocal imaging. The breast is immersed in a liquid with electrical properties similar to skin or breast tissue, but of low loss. The characteristics of resistively loaded dipole antennas in the immersion media are investigated. The influences of the number of antennas and immersion medium on reconstructed images are examined. Results indicate successful detection of 6 mm diameter tumors with both immersion media, and larger tumor returns with the system immersed in skin.","PeriodicalId":149404,"journal":{"name":"2000 IEEE MTT-S International Microwave Symposium Digest (Cat. No.00CH37017)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129391916","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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