Pub Date : 2007-04-18DOI: 10.1109/ICMMT.2007.381462
A. Cao, L. Jiang, S.H. Chen, S. Antipov, S. Shi
In this paper, the intermediate frequency (IF) gain bandwidth of a quasi-optical NbN superconducting hot-electron bolometer (HEB) mixer is investigated at 500 GHz with an IF system incorporating with a frequency down-converting scheme which is able to sweep the IF signal in a frequency range of 0.3-4 GHz. The IF gain bandwidth of the device is measured to be 1.5 GHz when it is biased at a voltage of the minimum noise temperature, and becomes larger when the bias voltage increases.
{"title":"IF Gain Bandwidth of a Quasi-Optical NbN Superconducting HEB Mixer","authors":"A. Cao, L. Jiang, S.H. Chen, S. Antipov, S. Shi","doi":"10.1109/ICMMT.2007.381462","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381462","url":null,"abstract":"In this paper, the intermediate frequency (IF) gain bandwidth of a quasi-optical NbN superconducting hot-electron bolometer (HEB) mixer is investigated at 500 GHz with an IF system incorporating with a frequency down-converting scheme which is able to sweep the IF signal in a frequency range of 0.3-4 GHz. The IF gain bandwidth of the device is measured to be 1.5 GHz when it is biased at a voltage of the minimum noise temperature, and becomes larger when the bias voltage increases.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":"261 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116373279","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 : 2007-04-18DOI: 10.1109/ICMMT.2007.381345
S. Phaiboon, P. Phokharatkul, P. Kittithamavongs
This paper presents an intelligent radio wave propagation prediction model by using the 2-dimension aerial image which is taken from the actual area. An suburban area is used as examples. The prediction procedure is done in three steps. First, the image segmentation is employed to divide the area image into subgroups by using Maximum Likelihood algorithm. The second step uses the subgroup images from step 1 to determine the parameters for the fuzzy model that we use to classify the propagation areas. The final step is to plot the path loss contour on the image so the cellular cell site can be chosen. The research results show that the proposed segmentation provides an accuracy of 80-90% compared with the actual area. Therefore, cell site selection can be designed on the 2-dimension aerial map with the error less than 8 dB.
{"title":"Mobile Path Loss Prediction with Image Segmentation and Classification","authors":"S. Phaiboon, P. Phokharatkul, P. Kittithamavongs","doi":"10.1109/ICMMT.2007.381345","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381345","url":null,"abstract":"This paper presents an intelligent radio wave propagation prediction model by using the 2-dimension aerial image which is taken from the actual area. An suburban area is used as examples. The prediction procedure is done in three steps. First, the image segmentation is employed to divide the area image into subgroups by using Maximum Likelihood algorithm. The second step uses the subgroup images from step 1 to determine the parameters for the fuzzy model that we use to classify the propagation areas. The final step is to plot the path loss contour on the image so the cellular cell site can be chosen. The research results show that the proposed segmentation provides an accuracy of 80-90% compared with the actual area. Therefore, cell site selection can be designed on the 2-dimension aerial map with the error less than 8 dB.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124314080","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 : 2007-04-18DOI: 10.1109/ICMMT.2007.381341
Shuguang Liu, Xiaojuan Zhang
A novel hybrid method that combines high order Nystrom method and PO method is developed in this paper. It is shown that this method is capable of calculating the scattering properties of 3D conductor targets of arbitrary shape and can achieve desired accuracy. This method employs the simplicity and concision of the Nystrom method and PO method and it is suitable for computing the scattering properties of electrically large problems with fine scattering features. Various examples show the applicability of this method.
{"title":"High Order Nyström-PO Hybrid Method for 3D EM Scattering of Arbitrar Shape","authors":"Shuguang Liu, Xiaojuan Zhang","doi":"10.1109/ICMMT.2007.381341","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381341","url":null,"abstract":"A novel hybrid method that combines high order Nystrom method and PO method is developed in this paper. It is shown that this method is capable of calculating the scattering properties of 3D conductor targets of arbitrary shape and can achieve desired accuracy. This method employs the simplicity and concision of the Nystrom method and PO method and it is suitable for computing the scattering properties of electrically large problems with fine scattering features. Various examples show the applicability of this method.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115967026","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 : 2007-04-18DOI: 10.1109/ICMMT.2007.381456
M. Buchta
The technological requirements leads to an unavoidable border at finite grounding via arrays. At a certain frequency an unwanted wave travelling occurs along the border. This paper provides not only detailed analytical and numerical analysis of such crosstalk effect, but also experimental verifications. The presented model achieves very good agreement over a broad range of border length variations.
{"title":"Analysis of Crosstalk Caused by Border Effect at Finite Grounding Via Arrays","authors":"M. Buchta","doi":"10.1109/ICMMT.2007.381456","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381456","url":null,"abstract":"The technological requirements leads to an unavoidable border at finite grounding via arrays. At a certain frequency an unwanted wave travelling occurs along the border. This paper provides not only detailed analytical and numerical analysis of such crosstalk effect, but also experimental verifications. The presented model achieves very good agreement over a broad range of border length variations.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132775572","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 : 2007-04-18DOI: 10.1109/ICMMT.2007.381271
Bing-Jhang Huang, Yuan Yao, Zhenghe Feng
A novel dual-band dual-polarization stacked microstrip -dielectric antenna is analyzed and designed. It transmits left-hand circularly polarized (LHCP) signals in L band and receives right-hand circularly polarized (RHCP) signals in S band. The antenna has been realized by two stacked square patches which are fed by four quadrature pins placed symmetrically on the two main axis. The amplitude and phase relationship between the four pins to maintain circular polarization is obtained by two wide band 90deg hybrid couplers. It can easily realize matching by changing the position of feed points. In the experiment results, high isolation between transmission port and receiving port, wide 3-dB beamwidth and perfect circular polarization characteristics in the dual-band are obtained.
{"title":"A Novel Wide Beam Dual-band Dual-Polarization Stacked Microstrip - Dielectric Antenna","authors":"Bing-Jhang Huang, Yuan Yao, Zhenghe Feng","doi":"10.1109/ICMMT.2007.381271","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381271","url":null,"abstract":"A novel dual-band dual-polarization stacked microstrip -dielectric antenna is analyzed and designed. It transmits left-hand circularly polarized (LHCP) signals in L band and receives right-hand circularly polarized (RHCP) signals in S band. The antenna has been realized by two stacked square patches which are fed by four quadrature pins placed symmetrically on the two main axis. The amplitude and phase relationship between the four pins to maintain circular polarization is obtained by two wide band 90deg hybrid couplers. It can easily realize matching by changing the position of feed points. In the experiment results, high isolation between transmission port and receiving port, wide 3-dB beamwidth and perfect circular polarization characteristics in the dual-band are obtained.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132452770","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 : 2007-04-18DOI: 10.1109/ICMMT.2007.381305
Wei Wei
Offset cross slots are used in designing the feeding network of the slotted-waveguide array antenna. Using equivalent theory, method of moment and Galerkin function, and according to boundary conditions of electromagnetic fields, this paper establish the integral equation to ascertain electric field distribution on the slot aperture, and dissertates an improved method of computing the impedance of feeding offset cross slots in broad wall of a rectangular waveguide.
{"title":"Analysis of Impedance of Feeding Offset Cross Slots in the Broad Wall of a Rectangular Waveguide","authors":"Wei Wei","doi":"10.1109/ICMMT.2007.381305","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381305","url":null,"abstract":"Offset cross slots are used in designing the feeding network of the slotted-waveguide array antenna. Using equivalent theory, method of moment and Galerkin function, and according to boundary conditions of electromagnetic fields, this paper establish the integral equation to ascertain electric field distribution on the slot aperture, and dissertates an improved method of computing the impedance of feeding offset cross slots in broad wall of a rectangular waveguide.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132633962","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}
For anti-millimeter wave polarization agile active jamming, interpulse polarization coding technique, as a new polarization signal processing method, is proposed in this paper. The active jamming, as an effective technique to interfere traditional radar, is popular used nowadays. It often works with a single polarization antenna, so it can be identified by polarimetric radar. But a millimeter wave polarization agile active jamming is effective to deceit millimeter wave polarimetric radar. Therefore, a new recognition technique is necessary to be researched for anti-millimeter wave polarization agile active jamming. The purpose of the paper is to present an effective method for countermeasure to millimeter wave polarization agile active jamming. The interpulse polarization coding technology, as a new method using in millimeter wave polarimetric radar, is proposed and a new polarization demodulation method is given in the paper. The results of simulation prove the new method is effective to suppress millimeter wave polarization agile active jamming.
{"title":"Anti-Millimeter Wave Polarization Agile Active Jamming","authors":"Qiao Xiaolin, Jin Tao, Qiao Xiaohui, Zhang Min, Yuan Shuqing, Zhang Qunxing","doi":"10.1109/ICMMT.2007.381515","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381515","url":null,"abstract":"For anti-millimeter wave polarization agile active jamming, interpulse polarization coding technique, as a new polarization signal processing method, is proposed in this paper. The active jamming, as an effective technique to interfere traditional radar, is popular used nowadays. It often works with a single polarization antenna, so it can be identified by polarimetric radar. But a millimeter wave polarization agile active jamming is effective to deceit millimeter wave polarimetric radar. Therefore, a new recognition technique is necessary to be researched for anti-millimeter wave polarization agile active jamming. The purpose of the paper is to present an effective method for countermeasure to millimeter wave polarization agile active jamming. The interpulse polarization coding technology, as a new method using in millimeter wave polarimetric radar, is proposed and a new polarization demodulation method is given in the paper. The results of simulation prove the new method is effective to suppress millimeter wave polarization agile active jamming.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115668909","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 : 2007-04-18DOI: 10.1109/ICMMT.2007.381427
Yang Wei-ming, Chen Jian-xin, Shi Chen, Liu Su-juan
The SPICE model parameters of SiGe HBT with high resistivity substrate is extracted. Compared results between measured and simulated data verify that this model is suitable for SiGe HBT DC and AC small-signal characterizations' representation. Using these extracted SPICE parameters, a two-stage direct-coupled amplifier has been designed and implemented on a Teflon substrate PCB. The simulated results are closed to that of test.
{"title":"SPICE Model of SiGe HBT with High Resistivity Substrate and its Amplifier Design","authors":"Yang Wei-ming, Chen Jian-xin, Shi Chen, Liu Su-juan","doi":"10.1109/ICMMT.2007.381427","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381427","url":null,"abstract":"The SPICE model parameters of SiGe HBT with high resistivity substrate is extracted. Compared results between measured and simulated data verify that this model is suitable for SiGe HBT DC and AC small-signal characterizations' representation. Using these extracted SPICE parameters, a two-stage direct-coupled amplifier has been designed and implemented on a Teflon substrate PCB. The simulated results are closed to that of test.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114407550","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 : 2007-04-18DOI: 10.1109/ICMMT.2007.381441
R. Wang, Wang Yong, Ding Yaogen, Ruan Cunjun
The sheet beam klystron (SBK) is a new kind of microwave vacuum devices, which uses a high aspect ratio, thin rectangular beam to reduce space charge effects, increase power capability and beam-wave interaction efficiency. In this paper, an SBK cavity was studied and the resonant frequency, quality-factor and shunt impedance were computed. The theoretical formulae and 3D PIC simulation code were respectively used to find out the relation between gap voltage and input power, and the results of two methods were compared.
{"title":"3D Simulation for the Cavity of X-band Sheet Beam Klystron","authors":"R. Wang, Wang Yong, Ding Yaogen, Ruan Cunjun","doi":"10.1109/ICMMT.2007.381441","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381441","url":null,"abstract":"The sheet beam klystron (SBK) is a new kind of microwave vacuum devices, which uses a high aspect ratio, thin rectangular beam to reduce space charge effects, increase power capability and beam-wave interaction efficiency. In this paper, an SBK cavity was studied and the resonant frequency, quality-factor and shunt impedance were computed. The theoretical formulae and 3D PIC simulation code were respectively used to find out the relation between gap voltage and input power, and the results of two methods were compared.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116903901","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 : 2007-04-18DOI: 10.1109/ICMMT.2007.381270
Qi-sheng Wang, Xiao-wei Shi
Various techniques and geometries have been introduced for size reduction of microstrip patch antennas. Fractal technology makes antennas improved obviously in structure, frequency bandwidth, sidelobe capabilities and so on. This paper reviews its concept and presents an evaluation on a novel spherical conformal microstrip patch antenna using fractal geometry. The simulated results indicate that the size of antenna can be reduced obviously; the radiation bandwidth can be increased at the same time.
{"title":"A Novel Spherical Conformal Microstrip Patch Antenna Based on Fractal Concepts","authors":"Qi-sheng Wang, Xiao-wei Shi","doi":"10.1109/ICMMT.2007.381270","DOIUrl":"https://doi.org/10.1109/ICMMT.2007.381270","url":null,"abstract":"Various techniques and geometries have been introduced for size reduction of microstrip patch antennas. Fractal technology makes antennas improved obviously in structure, frequency bandwidth, sidelobe capabilities and so on. This paper reviews its concept and presents an evaluation on a novel spherical conformal microstrip patch antenna using fractal geometry. The simulated results indicate that the size of antenna can be reduced obviously; the radiation bandwidth can be increased at the same time.","PeriodicalId":409971,"journal":{"name":"2007 International Conference on Microwave and Millimeter Wave Technology","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129411068","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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