Pub Date : 1900-01-01DOI: 10.1109/ISAPE.2003.1276623
Zhu Xiang-qin, Ge De-biao, Wu Yue-li
To analyze the radiation of a monopole covered with plasma, a shift operator method in FDTD is applied. By using this scheme we compute the radiation of a monopole antenna with the coverage of plasma. We observe from the numerical results that the plasma can greatly absorb electromagnetic waves and can impede the Gaussian pulse travelling along the antenna. In addition, the high frequency components in the radiation fields are decreased, and the resonant frequencies are shifted.
{"title":"FDTD analysis of radiation from monopole antenna with plasma coating","authors":"Zhu Xiang-qin, Ge De-biao, Wu Yue-li","doi":"10.1109/ISAPE.2003.1276623","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276623","url":null,"abstract":"To analyze the radiation of a monopole covered with plasma, a shift operator method in FDTD is applied. By using this scheme we compute the radiation of a monopole antenna with the coverage of plasma. We observe from the numerical results that the plasma can greatly absorb electromagnetic waves and can impede the Gaussian pulse travelling along the antenna. In addition, the high frequency components in the radiation fields are decreased, and the resonant frequencies are shifted.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127701787","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 : 1900-01-01DOI: 10.1109/ISAPE.2003.1276654
C. Zhao, Ping Li
This paper designs a single-chip machine system control enlarge signal and antenna location system. It is located according to the satellite's longitude and latitude angle of rotation and elevation in receive place. The calculation compensates the signal enlargement and gives the highest signal level by controlling the matrix. This is done according to the transmission wastage factor of the electric wave of different areas.
{"title":"Reception of the antenna auto-location system of high rail satellite","authors":"C. Zhao, Ping Li","doi":"10.1109/ISAPE.2003.1276654","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276654","url":null,"abstract":"This paper designs a single-chip machine system control enlarge signal and antenna location system. It is located according to the satellite's longitude and latitude angle of rotation and elevation in receive place. The calculation compensates the signal enlargement and gives the highest signal level by controlling the matrix. This is done according to the transmission wastage factor of the electric wave of different areas.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122383670","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 : 1900-01-01DOI: 10.1109/ISAPE.2003.1276739
Zhou Dong-fang, Ma Tian-Peng, Jiang Chang-yin, Sun Hong-lin, Hou De-ting, Li Xiang-he
In this paper, we present the newest calculation model of microwave propagation attenuation by rainfall in atmosphere, simulate the rainfall attenuation in a certain area according to its weather data and geography information system, and analyze the simulation results simply.
{"title":"Analysis of the characteristic of rainfall attenuation of microwave and calculation module simulation","authors":"Zhou Dong-fang, Ma Tian-Peng, Jiang Chang-yin, Sun Hong-lin, Hou De-ting, Li Xiang-he","doi":"10.1109/ISAPE.2003.1276739","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276739","url":null,"abstract":"In this paper, we present the newest calculation model of microwave propagation attenuation by rainfall in atmosphere, simulate the rainfall attenuation in a certain area according to its weather data and geography information system, and analyze the simulation results simply.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122391995","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 : 1900-01-01DOI: 10.1109/ISAPE.2003.1276758
Enjie Ding, Bingyu Li
A new multi-path propagation model for predicting radio channel in rectangular tunnel is built. The traditional model is only a special case of the new model. An iterating algorithm for calculating multi-path propagation distances of radio rays in the new model is discussed.
{"title":"Algorithm for calculating multi-path distances in rectangular tunnel","authors":"Enjie Ding, Bingyu Li","doi":"10.1109/ISAPE.2003.1276758","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276758","url":null,"abstract":"A new multi-path propagation model for predicting radio channel in rectangular tunnel is built. The traditional model is only a special case of the new model. An iterating algorithm for calculating multi-path propagation distances of radio rays in the new model is discussed.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"132 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122881599","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 : 1900-01-01DOI: 10.1109/ISAPE.2003.1276652
A. Bayat, A. Khaleqi
Satellite communication and remote sensing systems need reflector antennas for communication. An efficient system could be constructed with offset reflector and an appropriate corrugated horn to generate low cross polarization, high efficiency, low VSWR and low side lobe level. An offset reflector antenna has been designed and an appropriate corrugated horn in X-band satellite communication with near perfect Gaussian beam was constructed to achieve the required specifications.
{"title":"Design and implementation of an X-band corrugated feed horn for offset reflector antenna","authors":"A. Bayat, A. Khaleqi","doi":"10.1109/ISAPE.2003.1276652","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276652","url":null,"abstract":"Satellite communication and remote sensing systems need reflector antennas for communication. An efficient system could be constructed with offset reflector and an appropriate corrugated horn to generate low cross polarization, high efficiency, low VSWR and low side lobe level. An offset reflector antenna has been designed and an appropriate corrugated horn in X-band satellite communication with near perfect Gaussian beam was constructed to achieve the required specifications.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124469755","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 : 1900-01-01DOI: 10.1109/ISAPE.2003.1276764
S. Pan, Qiang Wang, Zongqian Li, Yi Hua Zhai
The echo data of airborne DBS radar are simulated given the cross section of the ground targets. The range-Doppler cell is introduced to reduce computational amount. DBS images with the simulated echo data are presented. Some useful conclusions can be retrieved from these images.
{"title":"The echo data simulation of airborne DBS radar","authors":"S. Pan, Qiang Wang, Zongqian Li, Yi Hua Zhai","doi":"10.1109/ISAPE.2003.1276764","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276764","url":null,"abstract":"The echo data of airborne DBS radar are simulated given the cross section of the ground targets. The range-Doppler cell is introduced to reduce computational amount. DBS images with the simulated echo data are presented. Some useful conclusions can be retrieved from these images.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127902985","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 : 1900-01-01DOI: 10.1109/ISAPE.2003.1276767
Song Lizhong, Qiao Xiaolin, M. Xiande, Jin Ming
The terminal guidance radar is faced with the interferences including the passive chaff and the active off-board decoy. It is effective to adopt polarization signal processing to suppress such interferences. Traditional polarization signal processing is finished in the video frequency, and the radar receiver would be saturated and disabled when the interference is strong enough. For this, a new adaptive polarization agile microwave network is proposed in order to solve the problem in this paper. The microwave network can suppress the interferences in the RF band before the interferences enter into the receiver, so we call it RF polarization filter. The structure and theorem of the RF polarization filter are given and the estimates of the interference polarization parameter arc also discussed.
{"title":"Study on the method of RF filtering for the new polarization radar","authors":"Song Lizhong, Qiao Xiaolin, M. Xiande, Jin Ming","doi":"10.1109/ISAPE.2003.1276767","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276767","url":null,"abstract":"The terminal guidance radar is faced with the interferences including the passive chaff and the active off-board decoy. It is effective to adopt polarization signal processing to suppress such interferences. Traditional polarization signal processing is finished in the video frequency, and the radar receiver would be saturated and disabled when the interference is strong enough. For this, a new adaptive polarization agile microwave network is proposed in order to solve the problem in this paper. The microwave network can suppress the interferences in the RF band before the interferences enter into the receiver, so we call it RF polarization filter. The structure and theorem of the RF polarization filter are given and the estimates of the interference polarization parameter arc also discussed.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128705694","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 : 1900-01-01DOI: 10.1109/ISAPE.2003.1276765
Tang Hui, Zhang Ye, Jin Ming, Zhao Yinan
A focused minimum variance distortionless (MVDR) beamformer for broadband adaptive beamforming is formulated and contrasted with the conventional beamformer. The proposed beamformer involves a preprocessor that focuses the signal spaces at different frequencies to a common one and an MVDR beamformer as the narrowband beamformer following the pre-processor. The merits that result as a consequence are improved computational efficiency of focusing and adaptivity and high beamforming resolution of MVDR with short observation times.
{"title":"A broadband focused MVDR beamformer for use with short observation times","authors":"Tang Hui, Zhang Ye, Jin Ming, Zhao Yinan","doi":"10.1109/ISAPE.2003.1276765","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276765","url":null,"abstract":"A focused minimum variance distortionless (MVDR) beamformer for broadband adaptive beamforming is formulated and contrasted with the conventional beamformer. The proposed beamformer involves a preprocessor that focuses the signal spaces at different frequencies to a common one and an MVDR beamformer as the narrowband beamformer following the pre-processor. The merits that result as a consequence are improved computational efficiency of focusing and adaptivity and high beamforming resolution of MVDR with short observation times.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128857477","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 : 1900-01-01DOI: 10.1109/ISAPE.2003.1276626
S. Latif, S.K. Sharma, L. Shafai
Microstrip antennas have played an important role in the field of wireless communications in the past few decades. It is required in applications such as mobile handsets, PC cards or in PCS, miniaturized as well as wideband antennas. Engineers and researchers have made extensive efforts to miniaturize microstrip antennas, but small antennas inherently have narrow bandwidth. However, in order to transmit and receive more information, large bandwidths are required and bandwidth enhancement is currently a popular research. Some common broadbanding techniques are the use of multimode resonators, use of parasitic elements with main radiating patch and use of stacked patches [R. Garg et al., 2001]. All these techniques result in increasing the antenna size. Therefore, the issue of antenna miniaturization is of major interest [A.K. Skriverik et al., August 2001]. In [(S.K Sharma et al., June 2002) (S.K. Sharma et al.)], a monopole slot cut at one corner of the ground plane was presented with simulated and experimental results. In this paper, the monopole slot at the center of the ground plane is parametrically studied for its impedance bandwidth (S1/sub 1/= -10 dB) using method of moments (MOM) software Ensemble 8.0. The radiation characteristics are also investigated using finite element method (FEM) software, HFSS.
在过去的几十年里，微带天线在无线通信领域发挥了重要的作用。在移动电话、PC卡或PC机、小型化和宽带天线等应用中都需要它。工程师和研究人员已经为微带天线的小型化做出了大量的努力，但小型天线固有的带宽很窄。然而，为了传输和接收更多的信息，需要更大的带宽，带宽增强是目前研究的热点。一些常见的宽带技术是使用多模谐振器，使用带有主辐射贴片的寄生元件和使用堆叠贴片[R]。Garg等，2001]。所有这些技术都增加了天线的尺寸。因此，天线小型化的问题是主要的兴趣[A.K.]Skriverik等，August 2001]。在[(S。K Sharma et al.， 2002年6月)[S.K. Sharma et al.]，给出了在地平面一角切割单极子槽的模拟和实验结果。本文利用矩量法(MOM)软件对地平面中心单极槽的阻抗带宽(S1/sub 1/= -10 dB)进行了参数化研究。利用有限元软件HFSS对其辐射特性进行了研究。
{"title":"Wideband microstrip monopole slot antenna","authors":"S. Latif, S.K. Sharma, L. Shafai","doi":"10.1109/ISAPE.2003.1276626","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276626","url":null,"abstract":"Microstrip antennas have played an important role in the field of wireless communications in the past few decades. It is required in applications such as mobile handsets, PC cards or in PCS, miniaturized as well as wideband antennas. Engineers and researchers have made extensive efforts to miniaturize microstrip antennas, but small antennas inherently have narrow bandwidth. However, in order to transmit and receive more information, large bandwidths are required and bandwidth enhancement is currently a popular research. Some common broadbanding techniques are the use of multimode resonators, use of parasitic elements with main radiating patch and use of stacked patches [R. Garg et al., 2001]. All these techniques result in increasing the antenna size. Therefore, the issue of antenna miniaturization is of major interest [A.K. Skriverik et al., August 2001]. In [(S.K Sharma et al., June 2002) (S.K. Sharma et al.)], a monopole slot cut at one corner of the ground plane was presented with simulated and experimental results. In this paper, the monopole slot at the center of the ground plane is parametrically studied for its impedance bandwidth (S1/sub 1/= -10 dB) using method of moments (MOM) software Ensemble 8.0. The radiation characteristics are also investigated using finite element method (FEM) software, HFSS.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116848063","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 : 1900-01-01DOI: 10.1109/ISAPE.2003.1276777
Xuan Liming, N. Zaiping
Several efficient methods are proposed in this paper to evaluate and accelerate the Sommerfeld integrals for stratified media Green's functions, with the emphasis on the case of half-space. For reference, the slowly convergent method of integration along the Sommerfeld integration path (SIP) is first summarily discussed. To speed up the convergence of the SIs, the deformation is made from the SIP to the steepest descent path (SDP). If branch point is surrounded by the contour, the constant phase path passing through the branch point (BSDP) is added to calculate the contribution of the branch point singularity. Along the deformed path, the integrands have a characteristic of constant phase and fast decaying, which results in the contribution of the path integration mainly from the vicinity of the saddle point and the computation time reduced. Further reducing computation time is realized through the asymptotic approximation based stationary phase method or saddle point method (SPA) along the SDP or the BSDP and physical explanation is enlightened. Numerical results show the validity of the proposed methods.
{"title":"Evaluation and acceleration of Sommerfeld integrals for stratified media Green's functions","authors":"Xuan Liming, N. Zaiping","doi":"10.1109/ISAPE.2003.1276777","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276777","url":null,"abstract":"Several efficient methods are proposed in this paper to evaluate and accelerate the Sommerfeld integrals for stratified media Green's functions, with the emphasis on the case of half-space. For reference, the slowly convergent method of integration along the Sommerfeld integration path (SIP) is first summarily discussed. To speed up the convergence of the SIs, the deformation is made from the SIP to the steepest descent path (SDP). If branch point is surrounded by the contour, the constant phase path passing through the branch point (BSDP) is added to calculate the contribution of the branch point singularity. Along the deformed path, the integrands have a characteristic of constant phase and fast decaying, which results in the contribution of the path integration mainly from the vicinity of the saddle point and the computation time reduced. Further reducing computation time is realized through the asymptotic approximation based stationary phase method or saddle point method (SPA) along the SDP or the BSDP and physical explanation is enlightened. Numerical results show the validity of the proposed methods.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116739362","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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