Pub Date : 1900-01-01DOI: 10.1109/ISAPE.2003.1276799
D. Ochi, T. Matsuoka, M. Tateiba, Y. Nanbu
In this paper, the composite medium containing sparsely and randomly distributed aggregate spheres is considered. The effective propagation constants of the medium for the left- and right-handed polarization is evaluated by solving the multiple scattering equation using EFA. The T-matrix of the aggregate sphere is obtained by the recursive algorithm. Numerical results show that when the aggregate sphere consists of chiral or dielectric spheres whose size are much smaller than the wavelength, the characteristics of the aggregate sphere depend mainly on the properties of a scatterer of the largest size.
{"title":"An analysis of the effective propagation constant for a composite medium containing sparsely and randomly distributed pairs of dielectric or chiral spheres","authors":"D. Ochi, T. Matsuoka, M. Tateiba, Y. Nanbu","doi":"10.1109/ISAPE.2003.1276799","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276799","url":null,"abstract":"In this paper, the composite medium containing sparsely and randomly distributed aggregate spheres is considered. The effective propagation constants of the medium for the left- and right-handed polarization is evaluated by solving the multiple scattering equation using EFA. The T-matrix of the aggregate sphere is obtained by the recursive algorithm. Numerical results show that when the aggregate sphere consists of chiral or dielectric spheres whose size are much smaller than the wavelength, the characteristics of the aggregate sphere depend mainly on the properties of a scatterer of the largest size.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"3 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":"133733044","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.2003.1276800
Yin Hongcheng, Xun Yanping, Chao Zengming
This paper presents an extension of the free-space method for measurement of bi-axial anisotropic material at microwave frequencies. In this method, four complex transverse constitutive parameters are directly computed from the reflection and transmission coefficients of a planar sample in free space for a normally incident plane wave with two polarizations. By using the measured amplitudes of the reflection and transmission coefficients of a planar sample at six incident angles with two polarizations, two complex longitudinal constitutive parameters are obtained by finding the solution to minimize the properly designed objective function under the suitable judging criterion. The numerical trials are carried out for a high-loss material by joining random errors to simulate the real measurement condition, which verifies the validity of this method.
{"title":"Free-space measurement of bi-axial anisotropic materials","authors":"Yin Hongcheng, Xun Yanping, Chao Zengming","doi":"10.1109/ISAPE.2003.1276800","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276800","url":null,"abstract":"This paper presents an extension of the free-space method for measurement of bi-axial anisotropic material at microwave frequencies. In this method, four complex transverse constitutive parameters are directly computed from the reflection and transmission coefficients of a planar sample in free space for a normally incident plane wave with two polarizations. By using the measured amplitudes of the reflection and transmission coefficients of a planar sample at six incident angles with two polarizations, two complex longitudinal constitutive parameters are obtained by finding the solution to minimize the properly designed objective function under the suitable judging criterion. The numerical trials are carried out for a high-loss material by joining random errors to simulate the real measurement condition, which verifies the validity of this method.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"126 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":"115459753","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.2003.1276658
Lin Ze Xiang, Lin Tao, Tang Kai Tai
The sphere interferometer antenna array is described in this paper. Such antenna from S band to Ku band has been designed, fabricated and tested over a wide range of incidence angles. The measurements results of the mechanical and electrical performance show that this prototype antenna can meet with the request of real application.
{"title":"Sphere interferometer antenna array","authors":"Lin Ze Xiang, Lin Tao, Tang Kai Tai","doi":"10.1109/ISAPE.2003.1276658","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276658","url":null,"abstract":"The sphere interferometer antenna array is described in this paper. Such antenna from S band to Ku band has been designed, fabricated and tested over a wide range of incidence angles. The measurements results of the mechanical and electrical performance show that this prototype antenna can meet with the request of real application.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"31 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":"115566848","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.2003.1276685
M.J.B. Constenla, M. Arias, A. Pino, O. Rubiños
Smart antenna sizes are too large to be implemented in indoor environments. Spatial diversity is too complicated to perform a fast deployment. An alternative design for such application is proposed, trying to obtain the benefits of spatial diversity but using only one compact antenna. The presented design is based on patch antennas, and fits the requirements for DCS-UMTS applications.
{"title":"Broadband diversity patch antenna for DCS-UMTS indoor environments","authors":"M.J.B. Constenla, M. Arias, A. Pino, O. Rubiños","doi":"10.1109/ISAPE.2003.1276685","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276685","url":null,"abstract":"Smart antenna sizes are too large to be implemented in indoor environments. Spatial diversity is too complicated to perform a fast deployment. An alternative design for such application is proposed, trying to obtain the benefits of spatial diversity but using only one compact antenna. The presented design is based on patch antennas, and fits the requirements for DCS-UMTS applications.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"45 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":"114419556","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.2003.1276772
Qin Zhi-an, Deyuan Cheng
The non-divergence vector potential in M and N vector wave function space is respectively separated into a component each one can be expressed by a scalar function, and then the independent separative forms of the non-divergence vector potential and electromagnetic wave field in M and N vector wave function space is studied further.
{"title":"The electromagnetic wave field in M and N vector wave function space","authors":"Qin Zhi-an, Deyuan Cheng","doi":"10.1109/ISAPE.2003.1276772","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276772","url":null,"abstract":"The non-divergence vector potential in M and N vector wave function space is respectively separated into a component each one can be expressed by a scalar function, and then the independent separative forms of the non-divergence vector potential and electromagnetic wave field in M and N vector wave function space is studied further.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"19 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":"116360830","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.2003.1276798
Yubo Tian, J. Qian, Junfeng Lu, Wenfeng Guo
In terms of genetic algorithm (GA) and a parameter tracking scheme (PTS), the propagating constants of a waveguide filled with dissipative magnetic substances are accurately calculated and thoroughly analyzed. The practical results show the method is efficient and accurate. Moreover, it is found during the calculating that under certain conditions, the phase constant may be negative, which revealed that the wave propagating inside this waveguide possess the characteristic of that of the left-handed wave (LHW). It is of significance that the LHW may present in nature materials.
{"title":"The left-handed wave inside natural materials","authors":"Yubo Tian, J. Qian, Junfeng Lu, Wenfeng Guo","doi":"10.1109/ISAPE.2003.1276798","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276798","url":null,"abstract":"In terms of genetic algorithm (GA) and a parameter tracking scheme (PTS), the propagating constants of a waveguide filled with dissipative magnetic substances are accurately calculated and thoroughly analyzed. The practical results show the method is efficient and accurate. Moreover, it is found during the calculating that under certain conditions, the phase constant may be negative, which revealed that the wave propagating inside this waveguide possess the characteristic of that of the left-handed wave (LHW). It is of significance that the LHW may present in nature materials.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"229 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120878926","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.2003.1276740
C. Mayer, Dae Hong Kim
This paper addresses the frequency dependence of tropospheric scintillation by comparing the scintillation of both frequencies at the seven sites. Theoretically, tropospheric scintillation increases as the frequency increases with respect to a power function, f. The goal of this paper is to determine values for a, and study site, climate and elevation angle, dependence of a, with respect to rain and clear-sky conditions.
{"title":"Frequency dependence of scintillation at K and Ka-band","authors":"C. Mayer, Dae Hong Kim","doi":"10.1109/ISAPE.2003.1276740","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276740","url":null,"abstract":"This paper addresses the frequency dependence of tropospheric scintillation by comparing the scintillation of both frequencies at the seven sites. Theoretically, tropospheric scintillation increases as the frequency increases with respect to a power function, f. The goal of this paper is to determine values for a, and study site, climate and elevation angle, dependence of a, with respect to rain and clear-sky conditions.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"111 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":"124109708","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.2003.1276640
H. Nakano, T. Nakajima, H. Mimaki, J. Yamauchi
A loop antenna printed on a dielectric substrate backed by a conducting plane, where the conducting plane and substrate are of finite extent is analyzed in this paper. The loop antenna has a printed sleeve of width w/sub slv/ and is excited through an electromagnetically coupled strip line. The radiation characteristics, taking into account the finite sizes of the substrate and the reflector also is studied in this paper. The author used finite-difference time-domain (FDTD) method with Liao's second order absorbing boundary condition for the analysis of the strip loop antenna.
{"title":"A strip loop antenna with a sleeve","authors":"H. Nakano, T. Nakajima, H. Mimaki, J. Yamauchi","doi":"10.1109/ISAPE.2003.1276640","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276640","url":null,"abstract":"A loop antenna printed on a dielectric substrate backed by a conducting plane, where the conducting plane and substrate are of finite extent is analyzed in this paper. The loop antenna has a printed sleeve of width w/sub slv/ and is excited through an electromagnetically coupled strip line. The radiation characteristics, taking into account the finite sizes of the substrate and the reflector also is studied in this paper. The author used finite-difference time-domain (FDTD) method with Liao's second order absorbing boundary condition for the analysis of the strip loop antenna.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"24 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":"124480251","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.2003.1276683
D. Chang
The effects of multiple paths and channel capacity are concerned in the communication system. The SAS (smart antenna system) can solve these problems. The SAS can be separated by adaptive antenna array and MBA (multiple beams antenna array). In this paper, the MBA is discussed. There are different types of SAS that are developed in Taiwan for the applications of cellular phone system in GSM, WCDMA, and WLAN (wireless local access network). Key components such as wideband RP radiators and different kinds of RF BFN are developed for SAS. Several types of SAS with multiple beams and narrower beamwidth are developing and testing at Da Yeh University. The test results are quite agreed with that of simulation.
{"title":"The developments of smart antenna system at Da Yeh University","authors":"D. Chang","doi":"10.1109/ISAPE.2003.1276683","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276683","url":null,"abstract":"The effects of multiple paths and channel capacity are concerned in the communication system. The SAS (smart antenna system) can solve these problems. The SAS can be separated by adaptive antenna array and MBA (multiple beams antenna array). In this paper, the MBA is discussed. There are different types of SAS that are developed in Taiwan for the applications of cellular phone system in GSM, WCDMA, and WLAN (wireless local access network). Key components such as wideband RP radiators and different kinds of RF BFN are developed for SAS. Several types of SAS with multiple beams and narrower beamwidth are developing and testing at Da Yeh University. The test results are quite agreed with that of simulation.","PeriodicalId":179885,"journal":{"name":"6th International SYmposium on Antennas, Propagation and EM Theory, 2003. Proceedings. 2003","volume":"154 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":"125962599","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.2003.1276618
Sung-pyo Im, Sung-kyo Park, Choul-jun Park, Chong-baek Park
Radiofrequency thermal ablation (RTA) is becoming one of the treatment for small but inoperable tumors of the liver. In this paper, we designed the applicator composed of coaxial cable antenna with a ring slot for RTA. To optimize the maximum output of radiation at 2450 MHz, we simulated the antenna using electromagnetic simulation tools Maxwell program and analyzed the return loss and the electric field E/sub tot/ at the near-field region between the simulation results and the experiment results. As a result, we could obtain the return loss of 29.786 dB at 2450 MHz only when the antenna is placed between two liver blocks of a pig, and the measurement results agreed with the simulation results well. Therefore, this coaxial cable antenna with a ring slot can be used very usefully as the applicator for RTA.
{"title":"Characteristics of coaxial cable antenna with a ring slot for RTA","authors":"Sung-pyo Im, Sung-kyo Park, Choul-jun Park, Chong-baek Park","doi":"10.1109/ISAPE.2003.1276618","DOIUrl":"https://doi.org/10.1109/ISAPE.2003.1276618","url":null,"abstract":"Radiofrequency thermal ablation (RTA) is becoming one of the treatment for small but inoperable tumors of the liver. In this paper, we designed the applicator composed of coaxial cable antenna with a ring slot for RTA. To optimize the maximum output of radiation at 2450 MHz, we simulated the antenna using electromagnetic simulation tools Maxwell program and analyzed the return loss and the electric field E/sub tot/ at the near-field region between the simulation results and the experiment results. As a result, we could obtain the return loss of 29.786 dB at 2450 MHz only when the antenna is placed between two liver blocks of a pig, and the measurement results agreed with the simulation results well. Therefore, this coaxial cable antenna with a ring slot can be used very usefully as the applicator for RTA.","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":"129381164","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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