{"title":"Effect of laser and RF oscillator phase noises","authors":"Tae-Sik Cho, Changho Yun, Kanghee Kim, Kiseon Kim","doi":"10.1109/MWSYM.2004.1335913","DOIUrl":"https://doi.org/10.1109/MWSYM.2004.1335913","url":null,"abstract":"The effect of phase noises from a laser and an oscillator on radio over fiber (RoF) systems is analyzed and discussed with a power spectral density (PSD) function. It is shown that the carrier to noise ratio (CNR) penalty is deeply related to the bandwidth of a electrical filter at a receiver and the phase noise from a radio frequency (RF) signal oscillator rather than that from a laser with a small differential delay and a direct detection scheme. The CNR penalties due to the laser linewidths of 10 MHz and 624 MHz are 0.045 dB and 2.78 dB, while the increase of the RF oscillator linewidth from 1 Hz to 10 Hz results in about 10 dB penalty at 50 GHz, 24 km transmission in a standard single mode fiber (SSMF) with a fiber chromatic dispersion of 17 ps/km nm.","PeriodicalId":334675,"journal":{"name":"2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130788874","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}
S. Cha, Y.H. Chung, M. Wojtowwicz, I. Smorchkova, B. Allen, J.M. Yang, R. Kagiwada
{"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}
{"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}
P. Kozakowski, A. Lamecki, M. Mongiardo, M. Mrozowski, C. Tomassoni
{"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}
{"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}
V. T. Vo, K. L. Koon, Z.R. Hu, C. N. Dharmasiri, S. C. Subramaniam, A. Rezazadeh
{"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}
{"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}
{"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}
{"title":"On the influence of arithmetic underflow rounding standard on the speed of FDTD modeling","authors":"M. Sypniewski, W. Gwarek","doi":"10.1109/MWSYM.2004.1338949","DOIUrl":"https://doi.org/10.1109/MWSYM.2004.1338949","url":null,"abstract":"This paper presents the influence of arithmetic underflow rounding operations on the speed of FDTD analysis. It is shown that the underflow treatment according to the IEEE standard 754 (commonly accepted and implemented in modern arithmetic processors) may sometimes result in drastic slowdown of the speed of computing. The effect is much more pronounced in some of the most modern and most used processors. The ways to circumvent the effect by specific software operations are discussed.","PeriodicalId":334675,"journal":{"name":"2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535)","volume":"18 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":"115039849","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}
{"title":"Absorptive near-Gaussian low pass filter design with applications in the time and frequency domain","authors":"J. Breitbarth, D. Schmelzer","doi":"10.1109/MWSYM.2004.1338805","DOIUrl":"https://doi.org/10.1109/MWSYM.2004.1338805","url":null,"abstract":"The work presented here is for the design of an absorptive low pass filter for use in the time and frequency domain. The filter presented is absorptive in the stop band, flat in group delay to twice the half power frequency and near-Gaussian in shape. The design of the low pass filter is general with design examples in microstrip and coplanar waveguide at 40 GHz. Frequency domain measurements to 110 GHz and time domain measurements at 40 Gbits/s are presented. The absorptive filter presented has uses in pulse shaping, rise time alteration and harmonic matching.","PeriodicalId":334675,"journal":{"name":"2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535)","volume":"59 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":"115067089","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}