Pub Date : 1996-10-01DOI: 10.1109/EUMA.1996.337603
W. Schwab
The design of parallel-coupled microstrip band-pass filters with aligned input and output lines is described. The design procedure is a combination of coupled-resonator filter design from low-pass prototypes and a full-wave spectral domain resonance method. Measured results of a 37 GHz and a 60 GHz band-pass filter are presented.
{"title":"Full-wave design of parallel-coupled microstrip band-pass filters with aligned input and output lines","authors":"W. Schwab","doi":"10.1109/EUMA.1996.337603","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337603","url":null,"abstract":"The design of parallel-coupled microstrip band-pass filters with aligned input and output lines is described. The design procedure is a combination of coupled-resonator filter design from low-pass prototypes and a full-wave spectral domain resonance method. Measured results of a 37 GHz and a 60 GHz band-pass filter are presented.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127847839","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 : 1996-10-01DOI: 10.1109/EUMA.1996.337680
M. Tsuji, S. Yamato, H. Shigesawa
We report here for the first time the effect of lossy conductor with finite thickness on the resonant characteristics of strip-patch resonators. An unexpected behavior found here, especially in the unloaded quality factor, should be taken into account when high-performance microwave and millimeter-wave components are designed with actual lossy conductors Therefore, we discuss thoroughly such a behavior theoretically and experimentally.
{"title":"Extinction of lossy conductors and its effect on the resonant characteristics of strip-patch resonators","authors":"M. Tsuji, S. Yamato, H. Shigesawa","doi":"10.1109/EUMA.1996.337680","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337680","url":null,"abstract":"We report here for the first time the effect of lossy conductor with finite thickness on the resonant characteristics of strip-patch resonators. An unexpected behavior found here, especially in the unloaded quality factor, should be taken into account when high-performance microwave and millimeter-wave components are designed with actual lossy conductors Therefore, we discuss thoroughly such a behavior theoretically and experimentally.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121196035","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 : 1996-10-01DOI: 10.1109/EUMA.1996.337706
G. Zarba, G. Bertin, P. Besso
An improved transition from rectangular waveguide to microstrip is presented. This transition consists of a ridge waveguide transformer with the ending step extending over the microstrip and two side grooves which maintain the microstrip in its correct position, ensuring both a good electrical contact without soldering and an optimum measurement repeatability. In addition to step ridges, used for matching purposes, also the main guide is stepped in the wider side in order to obtain a single-mode operation in all sections of the transition. The transition is analysed by a full wave mode-matching method and optimised over the 17.7-19.7 GHz band. Measurements are performed in back-to-back configuration using a TRL calibration and the scattering matrix of a single transition is obtained using a de-embedding technique. Experimental results agree well with theory and measured return loss is better than 28 dB over the 16-20 GHz frequency band.
{"title":"An optimised waveguide to microstrip transition at K band","authors":"G. Zarba, G. Bertin, P. Besso","doi":"10.1109/EUMA.1996.337706","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337706","url":null,"abstract":"An improved transition from rectangular waveguide to microstrip is presented. This transition consists of a ridge waveguide transformer with the ending step extending over the microstrip and two side grooves which maintain the microstrip in its correct position, ensuring both a good electrical contact without soldering and an optimum measurement repeatability. In addition to step ridges, used for matching purposes, also the main guide is stepped in the wider side in order to obtain a single-mode operation in all sections of the transition. The transition is analysed by a full wave mode-matching method and optimised over the 17.7-19.7 GHz band. Measurements are performed in back-to-back configuration using a TRL calibration and the scattering matrix of a single transition is obtained using a de-embedding technique. Experimental results agree well with theory and measured return loss is better than 28 dB over the 16-20 GHz frequency band.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132476181","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 : 1996-10-01DOI: 10.1109/EUMA.1996.337569
A. Deleniv, M. Gubina, D. Kholodniak, I. Vendik
Closed form models are proposed for propagation parameters of high-TC superconducting (HTS) coupled microstrip lines taking into account anisotropy of dielectric properties of sapphire substrate and a non-homogeneous current distribution in the coupled strips and in the ground plane for the even and odd modes. The models were verified by a comparison with full-wave analysis results and by an experimental investigation of a coupled lines HTS resonator.
{"title":"Modeling of high-Tc superconducting coupled microstrip lines on sapphire substrate","authors":"A. Deleniv, M. Gubina, D. Kholodniak, I. Vendik","doi":"10.1109/EUMA.1996.337569","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337569","url":null,"abstract":"Closed form models are proposed for propagation parameters of high-TC superconducting (HTS) coupled microstrip lines taking into account anisotropy of dielectric properties of sapphire substrate and a non-homogeneous current distribution in the coupled strips and in the ground plane for the even and odd modes. The models were verified by a comparison with full-wave analysis results and by an experimental investigation of a coupled lines HTS resonator.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132669183","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 : 1996-10-01DOI: 10.1109/EUMA.1996.337639
M. Sobhy, M. Ng, E. Bakkar
This paper describes non-linear modelling of oscillators from time domain measurement. Non-linear time domain transfer functions are used to model both the generation of the oscillator output voltage wave and the reflection coefficient. The model can be combined with other subsystem models to perform complete system simulation. Overall non-linear system simulation in the time domain is computational efficient.
{"title":"Non-linear time domain modelling of oscillators","authors":"M. Sobhy, M. Ng, E. Bakkar","doi":"10.1109/EUMA.1996.337639","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337639","url":null,"abstract":"This paper describes non-linear modelling of oscillators from time domain measurement. Non-linear time domain transfer functions are used to model both the generation of the oscillator output voltage wave and the reflection coefficient. The model can be combined with other subsystem models to perform complete system simulation. Overall non-linear system simulation in the time domain is computational efficient.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128355196","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 : 1996-10-01DOI: 10.1109/EUMA.1996.337594
A. Stolze, G. Kompa
This paper presents a concept for the nonlinear modelling of dispersive photodiodes. Different devices such as MSM-, PIN-, and avalanche photodiodes can be described by the same equivalent circuit topology. The model of the photodiode is divided into two parts. A physically based part, which characterizes the generation of electron-hole-pairs and their drift in the depletion layer and an electrical model part, which describes the nonlinear dispersive characteristic of the photodiode by an equivalent circuit. The equivalent network comprises multidimensional charge and current sources similar to known microwave FET modelling approach. Different measurement steps and measurement setups are necessary to extract both physical parameters and electrical model parameters of the nonlinear equivalent circuit. As an example, we use a MSM-photodiode to demonstrate the measurements and extraction method to get the unknown model parameter. We demonstrate the use of the photodiode model to correct the errors, caused by the non-linearities of the photodiode, in a laser radar system.
{"title":"Nonlinear modelling of dispersive photodiodes based on frequency-and time-domain measurements","authors":"A. Stolze, G. Kompa","doi":"10.1109/EUMA.1996.337594","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337594","url":null,"abstract":"This paper presents a concept for the nonlinear modelling of dispersive photodiodes. Different devices such as MSM-, PIN-, and avalanche photodiodes can be described by the same equivalent circuit topology. The model of the photodiode is divided into two parts. A physically based part, which characterizes the generation of electron-hole-pairs and their drift in the depletion layer and an electrical model part, which describes the nonlinear dispersive characteristic of the photodiode by an equivalent circuit. The equivalent network comprises multidimensional charge and current sources similar to known microwave FET modelling approach. Different measurement steps and measurement setups are necessary to extract both physical parameters and electrical model parameters of the nonlinear equivalent circuit. As an example, we use a MSM-photodiode to demonstrate the measurements and extraction method to get the unknown model parameter. We demonstrate the use of the photodiode model to correct the errors, caused by the non-linearities of the photodiode, in a laser radar system.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125374419","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 : 1996-10-01DOI: 10.1109/EUMA.1996.337518
G. Tan
The performance of a novel front end system, the Multi Frequency Front End (MEFE), for use in a synthesis radio telescope is discussed. This front end covers 9 frequency bands in the range from 250 MHz to 8600 MHz. All receivers are based on the double superheterodyne principle. Each receiver has two channels which are connected to dual polarized feed systems. These linearly polarized, orthogonal channels allow the measurement of all four Stokes parameters of the received electromagnetic wave. An improvement in sensitivity and extension in frequency coverage is realized compared to present systems. Other important goals that are satisfied are compact design and frequency agility. These goals were met by using innovative designs for feed systems and local oscillator. The application of cryogenic cooling to feed components and HEMT based low noise amplifiers results in very low system temperatures. Emphasis is given to the constructional details and measured performance of a prototype front end.
{"title":"Upgrade of the Westerbork synthesis radio telescope: The multi frequency front end","authors":"G. Tan","doi":"10.1109/EUMA.1996.337518","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337518","url":null,"abstract":"The performance of a novel front end system, the Multi Frequency Front End (MEFE), for use in a synthesis radio telescope is discussed. This front end covers 9 frequency bands in the range from 250 MHz to 8600 MHz. All receivers are based on the double superheterodyne principle. Each receiver has two channels which are connected to dual polarized feed systems. These linearly polarized, orthogonal channels allow the measurement of all four Stokes parameters of the received electromagnetic wave. An improvement in sensitivity and extension in frequency coverage is realized compared to present systems. Other important goals that are satisfied are compact design and frequency agility. These goals were met by using innovative designs for feed systems and local oscillator. The application of cryogenic cooling to feed components and HEMT based low noise amplifiers results in very low system temperatures. Emphasis is given to the constructional details and measured performance of a prototype front end.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"2011 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121622796","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 : 1996-10-01DOI: 10.1109/EUMA.1996.337572
L. Giauffret, J. Laheurte
A microstrip antenna fed by a conductor-backed coplanar waveguide is demonstrated. The addition of a back-side metallic ground plane involves a possible leakage of the CPW mode into Parallel Plate Modes (PPMs) or the excitation of these PPMs by the back-radiation of the coupling slot. A theoretical model, based on the solution of coupled integral equations, is validated by experimental results. It is shown that the power leakage can be avoided by a proper choice of the substrate characteristics.
{"title":"Backing of microstrip patch antennas fed by coplanar waveguides","authors":"L. Giauffret, J. Laheurte","doi":"10.1109/EUMA.1996.337572","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337572","url":null,"abstract":"A microstrip antenna fed by a conductor-backed coplanar waveguide is demonstrated. The addition of a back-side metallic ground plane involves a possible leakage of the CPW mode into Parallel Plate Modes (PPMs) or the excitation of these PPMs by the back-radiation of the coupling slot. A theoretical model, based on the solution of coupled integral equations, is validated by experimental results. It is shown that the power leakage can be avoided by a proper choice of the substrate characteristics.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"123 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113970144","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 : 1996-10-01DOI: 10.1109/EUMA.1996.337648
T. Imaoka, A. Minakawa, N. Imai
In the flip-chip mounting of MMIC chips, an adequate separation between the flip chip and the mounting substrate must be maintained to prevent undesirable loading effects. In this paper, as an approach to solve this restriction, an electrically shielded MMIC is presented. This can be realized employing multilayer MMIC technology. An electrically shielded MMIC amplifier has been designed and fabricated, and satisfactory performance with excellent designability has been obtained. Furthermore, by using the electrically shielded MMICs, a novel high-density IC module construction providing excellent electrical and thermal functions, named "Stacked Integrated Circuits", is proposed.
{"title":"Multilayer MMIC for stacked integrated circuits","authors":"T. Imaoka, A. Minakawa, N. Imai","doi":"10.1109/EUMA.1996.337648","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337648","url":null,"abstract":"In the flip-chip mounting of MMIC chips, an adequate separation between the flip chip and the mounting substrate must be maintained to prevent undesirable loading effects. In this paper, as an approach to solve this restriction, an electrically shielded MMIC is presented. This can be realized employing multilayer MMIC technology. An electrically shielded MMIC amplifier has been designed and fabricated, and satisfactory performance with excellent designability has been obtained. Furthermore, by using the electrically shielded MMICs, a novel high-density IC module construction providing excellent electrical and thermal functions, named \"Stacked Integrated Circuits\", is proposed.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114208701","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 : 1996-10-01DOI: 10.1109/EUMA.1996.337730
D. Elad, A. Nahum, D. Adar, S. Zoref, E. Friedler, A. Madjar, B. Chiz
FMCW sensors are gaining more importance-in a wide variety of applications for measuring target range and relative velocity. In order to improve resolution of the sensor for measuring between two close, adjacent targets, one has to widen the bandwidth and to improve the linearity of the transmit chirp. In addition, improving the linearity increases the signal to noise ratio, and thus, the receiver sensitivity. In this paper we present a new analog, closed loop system, which pins the higher order VCO nonlinearity resulting in an overall linearity of 0.1%. The system is compact, cheap to implement, and free from spurious signals. Our theoretical analysis also identifies the important parameters which influence the linearity and sensitivity of the receiver.
{"title":"An improved, analog closed loop linearizer for W and Ka band FMCW","authors":"D. Elad, A. Nahum, D. Adar, S. Zoref, E. Friedler, A. Madjar, B. Chiz","doi":"10.1109/EUMA.1996.337730","DOIUrl":"https://doi.org/10.1109/EUMA.1996.337730","url":null,"abstract":"FMCW sensors are gaining more importance-in a wide variety of applications for measuring target range and relative velocity. In order to improve resolution of the sensor for measuring between two close, adjacent targets, one has to widen the bandwidth and to improve the linearity of the transmit chirp. In addition, improving the linearity increases the signal to noise ratio, and thus, the receiver sensitivity. In this paper we present a new analog, closed loop system, which pins the higher order VCO nonlinearity resulting in an overall linearity of 0.1%. The system is compact, cheap to implement, and free from spurious signals. Our theoretical analysis also identifies the important parameters which influence the linearity and sensitivity of the receiver.","PeriodicalId":219101,"journal":{"name":"1996 26th European Microwave Conference","volume":"93 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120841900","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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