Pub Date : 2004-06-06DOI: 10.1109/MWSYM.2004.1339121
M. Ueda, J. Tsutsumi, S. Inoue, T. Matsuda, O. Ikata, Y. Satoh
This paper describes PCS SAW duplexer using unique design methods in order to realize steep cut-off performance, which are based on ladder and DMS design for Tx and Rx, respectively. It is found that SAW resonator having narrow electrode fingers makes transverse leakage of SAW energy suppress around resonant frequency, so that band edge and skirt performance of Tx filter is much improved. For Rx part, new DMS (Double Mode SAW) is proposed which uses inductors and capacitors in the device effectively to realize higher rejection and better cut-off performance. We have succeeded to realize ultra-miniaturized PCS SAW duplexers for the US and Korean market using these technologies.
{"title":"Ultra-miniaturized and high performance PCS SAW duplexer with steep cut-off filters","authors":"M. Ueda, J. Tsutsumi, S. Inoue, T. Matsuda, O. Ikata, Y. Satoh","doi":"10.1109/MWSYM.2004.1339121","DOIUrl":"https://doi.org/10.1109/MWSYM.2004.1339121","url":null,"abstract":"This paper describes PCS SAW duplexer using unique design methods in order to realize steep cut-off performance, which are based on ladder and DMS design for Tx and Rx, respectively. It is found that SAW resonator having narrow electrode fingers makes transverse leakage of SAW energy suppress around resonant frequency, so that band edge and skirt performance of Tx filter is much improved. For Rx part, new DMS (Double Mode SAW) is proposed which uses inductors and capacitors in the device effectively to realize higher rejection and better cut-off performance. We have succeeded to realize ultra-miniaturized PCS SAW duplexers for the US and Korean market using these technologies.","PeriodicalId":334675,"journal":{"name":"2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133144268","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 : 2004-06-06DOI: 10.1109/MWSYM.2004.1335823
J. Booth, K. Leong, S. Schima
We report on the development of a microwave power limiter based on high-temperature superconductor technology. The power limiter takes the form of a 50 /spl Omega/ coplanar waveguide transmission line that can be reversibly driven from the low-loss superconducting state into the high-loss normal state as microwave currents within the device exceed a critical value. This device has demonstrated very low insertion loss (<0.5dB/cm at 70K, 40GHz) and extremely wide bandwidth (constant impedance up to 40 GHz) in the signal-pass state, with variable attenuation in the signal-block state. Switching times for transitions from the signal-pass state to the signal-block state are estimated to be on the order of a nanosecond or less. Reversible operation has been demonstrated for continuous-wave (CW) signals up to 10 W at 3GHz, and for 100 /spl mu/s transient signals up to 100W. This device should be valuable for protecting high-performance receiver components from high-power transients encountered in real-world applications.
{"title":"A superconducting microwave power limiter for high-performance receiver protection","authors":"J. Booth, K. Leong, S. Schima","doi":"10.1109/MWSYM.2004.1335823","DOIUrl":"https://doi.org/10.1109/MWSYM.2004.1335823","url":null,"abstract":"We report on the development of a microwave power limiter based on high-temperature superconductor technology. The power limiter takes the form of a 50 /spl Omega/ coplanar waveguide transmission line that can be reversibly driven from the low-loss superconducting state into the high-loss normal state as microwave currents within the device exceed a critical value. This device has demonstrated very low insertion loss (<0.5dB/cm at 70K, 40GHz) and extremely wide bandwidth (constant impedance up to 40 GHz) in the signal-pass state, with variable attenuation in the signal-block state. Switching times for transitions from the signal-pass state to the signal-block state are estimated to be on the order of a nanosecond or less. Reversible operation has been demonstrated for continuous-wave (CW) signals up to 10 W at 3GHz, and for 100 /spl mu/s transient signals up to 100W. This device should be valuable for protecting high-performance receiver components from high-power transients encountered in real-world applications.","PeriodicalId":334675,"journal":{"name":"2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535)","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131673442","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 : 2004-06-06DOI: 10.1109/MWSYM.2004.1339153
J. Guo, Sami G. Tantawi
A novel X-band single wafer amplifier and switch arrays are designed to work in a high Q circular waveguide cavity. This design can significantly reduce power leakage at the plane where the wafer is inserted, which is essential to achieve high Q and ultrahigh power. The array is achieved in an overmoded circular waveguide. The mode being exited and/or controlled by the array is the TE/sub 01/ mode. We hope that the use of an overmoded waveguide and the TE/sub 01/ mode would allow us to extend the power handling capabilities of the device by orders of magnitude beyond the state-of-the-art for semiconductor devices. We present the general design of the array and show several implementations.
{"title":"An ultra-high power amplifier and switch arrays on single wafer","authors":"J. Guo, Sami G. Tantawi","doi":"10.1109/MWSYM.2004.1339153","DOIUrl":"https://doi.org/10.1109/MWSYM.2004.1339153","url":null,"abstract":"A novel X-band single wafer amplifier and switch arrays are designed to work in a high Q circular waveguide cavity. This design can significantly reduce power leakage at the plane where the wafer is inserted, which is essential to achieve high Q and ultrahigh power. The array is achieved in an overmoded circular waveguide. The mode being exited and/or controlled by the array is the TE/sub 01/ mode. We hope that the use of an overmoded waveguide and the TE/sub 01/ mode would allow us to extend the power handling capabilities of the device by orders of magnitude beyond the state-of-the-art for semiconductor devices. We present the general design of the array and show several implementations.","PeriodicalId":334675,"journal":{"name":"2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131877609","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 : 2004-06-06DOI: 10.1109/MWSYM.2004.1339093
S. Cha, Y.H. Chung, M. Wojtowwicz, I. Smorchkova, B. Allen, J.M. Yang, R. Kagiwada
Gallium Nitride has emerged as the technology of choice for the next generation high power electronics. However, its ability to handling high power also makes it the perfect technology candidate for highly survivable receiver components. This has obvious cost benefit for the footprint of the LNA will be smaller since no extra front-end protection circuitry is required. In this paper, a wideband Gallium Nitride HEMT low noise amplifier MMIC, using novel dual gate topology, has been design and manufactured to demonstrate Gallium Nitride low noise capability.
{"title":"Wideband AlGaN/GaN HEMT low noise amplifier for highly survivable receiver electronics","authors":"S. Cha, Y.H. Chung, M. Wojtowwicz, I. Smorchkova, B. Allen, J.M. Yang, R. Kagiwada","doi":"10.1109/MWSYM.2004.1339093","DOIUrl":"https://doi.org/10.1109/MWSYM.2004.1339093","url":null,"abstract":"Gallium Nitride has emerged as the technology of choice for the next generation high power electronics. However, its ability to handling high power also makes it the perfect technology candidate for highly survivable receiver components. This has obvious cost benefit for the footprint of the LNA will be smaller since no extra front-end protection circuitry is required. In this paper, a wideband Gallium Nitride HEMT low noise amplifier MMIC, using novel dual gate topology, has been design and manufactured to demonstrate Gallium Nitride low noise capability.","PeriodicalId":334675,"journal":{"name":"2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535)","volume":"197 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115479941","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 : 2004-06-06DOI: 10.1109/MWSYM.2004.1335878
C. Allen, C. Caloz, T. Itoh
A two-dimensional periodic mushroom structure is proposed as a leaky-wave antenna with a conical beam. To the author's knowledge, this is the first 2D leaky wave antenna demonstrated experimentally. The structure can be modelled as a composite right/left-handed (CRLH) transmission line and exhibits both backward and forward leakage. The radiation patterns for the antenna are shown and demonstrated a scanning range of 15/spl deg/-33/spl deg/ in the backward region and 27/spl deg/-63/spl deg/ in the forward region.
{"title":"Leaky-waves in a metamaterial-based two-dimensional structure for a conical beam antenna application","authors":"C. Allen, C. Caloz, T. Itoh","doi":"10.1109/MWSYM.2004.1335878","DOIUrl":"https://doi.org/10.1109/MWSYM.2004.1335878","url":null,"abstract":"A two-dimensional periodic mushroom structure is proposed as a leaky-wave antenna with a conical beam. To the author's knowledge, this is the first 2D leaky wave antenna demonstrated experimentally. The structure can be modelled as a composite right/left-handed (CRLH) transmission line and exhibits both backward and forward leakage. The radiation patterns for the antenna are shown and demonstrated a scanning range of 15/spl deg/-33/spl deg/ in the backward region and 27/spl deg/-63/spl deg/ in the forward region.","PeriodicalId":334675,"journal":{"name":"2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535)","volume":"213 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115562496","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 : 2004-06-06DOI: 10.1109/MWSYM.2004.1336058
P. Kozakowski, A. Lamecki, M. Mongiardo, M. Mrozowski, C. Tomassoni
A CAD procedure for a new type of in-line resonator filters with multiple elliptical-apertures irises is presented. The proposed design procedure, based on the concept of automated CAD of coupled resonator filters, considerably simplifies filter design since, with this approach, the choice of the initial geometrical dimensions is not critical. To increase the computational efficiency, at first optimization is carried out by using multivariate surrogate models derived from full wave analysis; final dimensions are then directly obtained by a rigorous full-wave optimization of the entire structure. Two examples of filters with two transmission zeros at lower and upper stop-band are presented in order to illustrate the approach.
{"title":"Computer-aided design of in-line resonator filters with multiple elliptical apertures","authors":"P. Kozakowski, A. Lamecki, M. Mongiardo, M. Mrozowski, C. Tomassoni","doi":"10.1109/MWSYM.2004.1336058","DOIUrl":"https://doi.org/10.1109/MWSYM.2004.1336058","url":null,"abstract":"A CAD procedure for a new type of in-line resonator filters with multiple elliptical-apertures irises is presented. The proposed design procedure, based on the concept of automated CAD of coupled resonator filters, considerably simplifies filter design since, with this approach, the choice of the initial geometrical dimensions is not critical. To increase the computational efficiency, at first optimization is carried out by using multivariate surrogate models derived from full wave analysis; final dimensions are then directly obtained by a rigorous full-wave optimization of the entire structure. Two examples of filters with two transmission zeros at lower and upper stop-band are presented in order to illustrate the approach.","PeriodicalId":334675,"journal":{"name":"2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115778766","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 : 2004-06-06DOI: 10.1109/MWSYM.2004.1339159
V.H.C. Melo, C.A.T. de Carvalho, L. de Menezes
This work presents a novel numerical scheme for the acceleration of the 2-D Transmission-Line Matrix method. The idea is the use of controlled leaps in the time step in order to achieve faster processing. The leaps are numerically stable and may result in significant CPU savings. In addition to the adjustable time step, the procedure becomes more efficient by using model reduction with Schur decomposition. The technique was validated by the calculation of a microwave filter and subsequent comparison to the normal TLM results.
{"title":"High performance TLM simulation using adjustable time steps","authors":"V.H.C. Melo, C.A.T. de Carvalho, L. de Menezes","doi":"10.1109/MWSYM.2004.1339159","DOIUrl":"https://doi.org/10.1109/MWSYM.2004.1339159","url":null,"abstract":"This work presents a novel numerical scheme for the acceleration of the 2-D Transmission-Line Matrix method. The idea is the use of controlled leaps in the time step in order to achieve faster processing. The leaps are numerically stable and may result in significant CPU savings. In addition to the adjustable time step, the procedure becomes more efficient by using model reduction with Schur decomposition. The technique was validated by the calculation of a microwave filter and subsequent comparison to the normal TLM results.","PeriodicalId":334675,"journal":{"name":"2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535)","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114423036","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 : 2004-06-06DOI: 10.1109/MWSYM.2004.1339147
V. T. Vo, K. L. Koon, Z.R. Hu, C. N. Dharmasiri, S. C. Subramaniam, A. Rezazadeh
Voltage sensitivities of planar doped barrier (PDB) detector diodes as high as 17.4 mV//spl mu/W at 10 GHz and 28.6 mV//spl mu/W at 35 GHz have been achieved. In comparison with that of existing devices, these values are three to ten times higher, implying the diodes can detect much lower power hence widening the dynamic range of microwave/millimeter-wave detectors.
{"title":"High voltage sensitivity GaAs planar doped barrier diodes for microwave/millimeter-wave power detector applications","authors":"V. T. Vo, K. L. Koon, Z.R. Hu, C. N. Dharmasiri, S. C. Subramaniam, A. Rezazadeh","doi":"10.1109/MWSYM.2004.1339147","DOIUrl":"https://doi.org/10.1109/MWSYM.2004.1339147","url":null,"abstract":"Voltage sensitivities of planar doped barrier (PDB) detector diodes as high as 17.4 mV//spl mu/W at 10 GHz and 28.6 mV//spl mu/W at 35 GHz have been achieved. In comparison with that of existing devices, these values are three to ten times higher, implying the diodes can detect much lower power hence widening the dynamic range of microwave/millimeter-wave detectors.","PeriodicalId":334675,"journal":{"name":"2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535)","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114798935","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 : 2004-06-06DOI: 10.1109/MWSYM.2004.1338879
M. Ismail, K. Engel, Ming Yu
For the first time we exploit multiple space-mapping for T-switch design. The switch we consider has six paths. From symmetry the whole switch can be designed by considering only two paths. Applying space-mapping to each path does not produce feasible results since the two paths share some common design parameters. A multiple space-mapping algorithm has been developed and applied to design the two switch paths. The algorithm iteratively enhances the coarse model of each path. The enhanced coarse models are then optimized to meet the required specifications. Excellent RF performance in the C-band and Ku-band has been obtained in few iterations.
{"title":"Multiple space mapping for RF T-switch design","authors":"M. Ismail, K. Engel, Ming Yu","doi":"10.1109/MWSYM.2004.1338879","DOIUrl":"https://doi.org/10.1109/MWSYM.2004.1338879","url":null,"abstract":"For the first time we exploit multiple space-mapping for T-switch design. The switch we consider has six paths. From symmetry the whole switch can be designed by considering only two paths. Applying space-mapping to each path does not produce feasible results since the two paths share some common design parameters. A multiple space-mapping algorithm has been developed and applied to design the two switch paths. The algorithm iteratively enhances the coarse model of each path. The enhanced coarse models are then optimized to meet the required specifications. Excellent RF performance in the C-band and Ku-band has been obtained in few iterations.","PeriodicalId":334675,"journal":{"name":"2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115019484","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 : 2004-06-06DOI: 10.1109/MWSYM.2004.1338874
Jianjun Xu, M. Yagoub, R. Ding, Qi-jun Zhang
For the first time, the issue of using neural-based microwave models far outside their training range is directly addressed. A standard neural model is meaningful only outside the particular range of inputs for which it is trained, and becomes unreliable when used outside this range. This paper presents a robust neural modelling technique incorporating advanced extrapolation to address this problem. A new process is incorporated in training to formulate a set of base points to represent a regular or irregular training region. An adaptive base point selection method is developed to identify the most significant subset of base points upon any given value of model input. This method is combined with quadratic extrapolation utilizing neural network outputs and their derivatives. The proposed technique is demonstrated by examples of neural based design solution space analysis of coupled transmission lines and neural based behaviour modelling and simulation of power amplifiers. It is demonstrated that the proposed technique allows the neural based microwave models to be used far beyond their original training range.
{"title":"Robust neural based microwave modelling and design using advanced model extrapolation","authors":"Jianjun Xu, M. Yagoub, R. Ding, Qi-jun Zhang","doi":"10.1109/MWSYM.2004.1338874","DOIUrl":"https://doi.org/10.1109/MWSYM.2004.1338874","url":null,"abstract":"For the first time, the issue of using neural-based microwave models far outside their training range is directly addressed. A standard neural model is meaningful only outside the particular range of inputs for which it is trained, and becomes unreliable when used outside this range. This paper presents a robust neural modelling technique incorporating advanced extrapolation to address this problem. A new process is incorporated in training to formulate a set of base points to represent a regular or irregular training region. An adaptive base point selection method is developed to identify the most significant subset of base points upon any given value of model input. This method is combined with quadratic extrapolation utilizing neural network outputs and their derivatives. The proposed technique is demonstrated by examples of neural based design solution space analysis of coupled transmission lines and neural based behaviour modelling and simulation of power amplifiers. It is demonstrated that the proposed technique allows the neural based microwave models to be used far beyond their original training range.","PeriodicalId":334675,"journal":{"name":"2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115024996","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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