Pub Date : 2007-06-09DOI: 10.1109/APS.2007.4396615
Su-Wei Chang, Chien‐Jen Wang
In this paper, two types of the slot antenna were designed, fabricated, and measured. We used several technical methods to perform the impedance characteristics, control the operating frequency of resonances, enhance the impedance bandwidth at the resonances and miniaturize the size of the microstrip-fed slot antenna at the 2.4 GHz and 5 GHz (the industrial-scientific-medical (ISM) bands and the Hiperlan2) bands. The slot antenna was fabricated by changing the radiation element from the rectangular slot to the Z-like slot, adding four symmetrical tuning stubs at the slot edges, and splitting the slot into a double slot. The obtained impedance bandwidths for two operating bands can reach about 16.07 % for the 2.4 GHz band and 20.59 % for the 5 GHz band. The simulated and the measured radiation patterns of the double Z-like slot antenna were shown.
{"title":"A dual broadband dual slot antenna","authors":"Su-Wei Chang, Chien‐Jen Wang","doi":"10.1109/APS.2007.4396615","DOIUrl":"https://doi.org/10.1109/APS.2007.4396615","url":null,"abstract":"In this paper, two types of the slot antenna were designed, fabricated, and measured. We used several technical methods to perform the impedance characteristics, control the operating frequency of resonances, enhance the impedance bandwidth at the resonances and miniaturize the size of the microstrip-fed slot antenna at the 2.4 GHz and 5 GHz (the industrial-scientific-medical (ISM) bands and the Hiperlan2) bands. The slot antenna was fabricated by changing the radiation element from the rectangular slot to the Z-like slot, adding four symmetrical tuning stubs at the slot edges, and splitting the slot into a double slot. The obtained impedance bandwidths for two operating bands can reach about 16.07 % for the 2.4 GHz band and 20.59 % for the 5 GHz band. The simulated and the measured radiation patterns of the double Z-like slot antenna were shown.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121140738","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 : 2007-06-09DOI: 10.1109/APS.2007.4396123
M. Ammann, M. John
Printed planar monopole antennas are enjoying considerable popularity and publicity to their low-profile, wide bandwidth, quasi-omnidirectional radiation characteristics and their ease of integratability into devices. The impedance bandwidth and radiation properties of a strip monopole have been shown to be heavily dependent on groundplane size. The groundplane (GP) is of primary importance and when miniaturised, the antenna properties change significantly. Techniques to improve the performance of printed antennas on small groundplanes are presented.
{"title":"Some techniques to improve small groundplane printed monopole performance","authors":"M. Ammann, M. John","doi":"10.1109/APS.2007.4396123","DOIUrl":"https://doi.org/10.1109/APS.2007.4396123","url":null,"abstract":"Printed planar monopole antennas are enjoying considerable popularity and publicity to their low-profile, wide bandwidth, quasi-omnidirectional radiation characteristics and their ease of integratability into devices. The impedance bandwidth and radiation properties of a strip monopole have been shown to be heavily dependent on groundplane size. The groundplane (GP) is of primary importance and when miniaturised, the antenna properties change significantly. Techniques to improve the performance of printed antennas on small groundplanes are presented.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121342061","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 : 2007-06-09DOI: 10.1109/APS.2007.4395430
A. Holub, M. Polivka
In this paper, multiport network (MN) model of CoMPA excited by mode TM03 has been developed. The theoretical results have been compared with the Method of Moment based IE3D results. For the accurate matching of results of the both methods the radiating equivalent admittance network of the inner slot has been included. This is the unique of the presented MN model implementation.
{"title":"Application of MNM on collinear microstrip patch antenna","authors":"A. Holub, M. Polivka","doi":"10.1109/APS.2007.4395430","DOIUrl":"https://doi.org/10.1109/APS.2007.4395430","url":null,"abstract":"In this paper, multiport network (MN) model of CoMPA excited by mode TM03 has been developed. The theoretical results have been compared with the Method of Moment based IE3D results. For the accurate matching of results of the both methods the radiating equivalent admittance network of the inner slot has been included. This is the unique of the presented MN model implementation.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127089553","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 : 2007-06-09DOI: 10.1109/APS.2007.4395548
E. Altshuler, T. H. O’Donnell
In this paper the edge effects from a finite ground plane on the gain of an antenna for a wide band of frequencies at UHF and above was examined. Hewlett-Packard 8510 network analyzer was used for the measurements. Simulation is done using Ansoft's HFSS code for frequencies from 400 to 1200 MHz. In addition, the simulation is also done for an infinite ground plane so that the edge effects can be more easily understood.
{"title":"The measurement of antenna gain with transmitting and receiving antennas on a finite ground plane","authors":"E. Altshuler, T. H. O’Donnell","doi":"10.1109/APS.2007.4395548","DOIUrl":"https://doi.org/10.1109/APS.2007.4395548","url":null,"abstract":"In this paper the edge effects from a finite ground plane on the gain of an antenna for a wide band of frequencies at UHF and above was examined. Hewlett-Packard 8510 network analyzer was used for the measurements. Simulation is done using Ansoft's HFSS code for frequencies from 400 to 1200 MHz. In addition, the simulation is also done for an infinite ground plane so that the edge effects can be more easily understood.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127278233","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 : 2007-06-09DOI: 10.1109/APS.2007.4396592
I. Szini, C. Di Nallo, A. Faraone
An internal multi-band antenna for mobile phones featuring wide fractional bandwidth is presented. The antenna is realized by a flat conformal conductor above the ground plane, featuring a feed and ground connections to the PCB. A slot is cut in the flat conductor, which is open only in between the ground and feeding connections of the flat conductor, thus forming a slit. This structure is called enhanced bandwidth folded inverted conformal antenna (EB-FICA), with reference to its precursor FICA (Di Nallo and Faraone, 2005). The EB-FICA can be designed to be penta-band, covering the four GSM bands and the UMTS Rx band, and has been adopted in several Motorola products.
{"title":"The enhanced bandwidth folded inverted conformal antenna (EB FICA) for mufti-band cellular handsets","authors":"I. Szini, C. Di Nallo, A. Faraone","doi":"10.1109/APS.2007.4396592","DOIUrl":"https://doi.org/10.1109/APS.2007.4396592","url":null,"abstract":"An internal multi-band antenna for mobile phones featuring wide fractional bandwidth is presented. The antenna is realized by a flat conformal conductor above the ground plane, featuring a feed and ground connections to the PCB. A slot is cut in the flat conductor, which is open only in between the ground and feeding connections of the flat conductor, thus forming a slit. This structure is called enhanced bandwidth folded inverted conformal antenna (EB-FICA), with reference to its precursor FICA (Di Nallo and Faraone, 2005). The EB-FICA can be designed to be penta-band, covering the four GSM bands and the UMTS Rx band, and has been adopted in several Motorola products.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127312013","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 : 2007-06-09DOI: 10.1109/APS.2007.4395776
Yu-Jiun Ren, K. Chang
This paper reported a broadband 8x16 retrodirective array for millimeter-wave applications. The array element is a proximity-coupled dual-ring antenna with a bandwidth of 33.7% (31-42.8 GHz). The antenna is used to build a 4x4 retrodirective array as a sub-array Then the sub-arrays are assembled to form an 8x16 array. The design method of the array and the measured performances from 32 GHz to 40 GHz are presented.
{"title":"A broadband van atta retrodirective array for ka-band applications","authors":"Yu-Jiun Ren, K. Chang","doi":"10.1109/APS.2007.4395776","DOIUrl":"https://doi.org/10.1109/APS.2007.4395776","url":null,"abstract":"This paper reported a broadband 8x16 retrodirective array for millimeter-wave applications. The array element is a proximity-coupled dual-ring antenna with a bandwidth of 33.7% (31-42.8 GHz). The antenna is used to build a 4x4 retrodirective array as a sub-array Then the sub-arrays are assembled to form an 8x16 array. The design method of the array and the measured performances from 32 GHz to 40 GHz are presented.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127345006","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 : 2007-06-09DOI: 10.1109/APS.2007.4395478
S. Salvador, G. Vecchi
In this paper, microwave imaging technique for breast cancer detection is presented. The possibility to detect tumors of various dimensions and positioned in different locations (with respect to the breast itself and to the positions of antenna), employing the post-processing algorithm has been proposed with ultrawideband antenna terminals.
{"title":"On some experiments with UWB microwave imaging for breast cancer detection","authors":"S. Salvador, G. Vecchi","doi":"10.1109/APS.2007.4395478","DOIUrl":"https://doi.org/10.1109/APS.2007.4395478","url":null,"abstract":"In this paper, microwave imaging technique for breast cancer detection is presented. The possibility to detect tumors of various dimensions and positioned in different locations (with respect to the breast itself and to the positions of antenna), employing the post-processing algorithm has been proposed with ultrawideband antenna terminals.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127437767","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 : 2007-06-09DOI: 10.1109/APS.2007.4396819
H. Espinosa, A. Heldring, J. Rius
The application of the Method of Moments to the analysis of large PEC structures is difficult due to the computational requirements when the structure is discretized in a high number of unknowns. To solve this problem we propose the Multilevel Field Interpolation Algorithm (MLFIA) based on a source domain decomposition that permits a fast matrix-vector multiplication within the iterative solution that reduces the computational complexity and the memory requirements to O(NlogN). The execution of the algorithm is composed of five steps that follow the computation of the field evaluated at a set of evaluation points within the observation domain, the extraction of the Green's function, the interpolation of the fields, the restoration of the Green's function and finally the aggregation of the fields. The algorithm is applied to the fast solution of 2D problems. The generalization to 3D problems is straightforward.
{"title":"Application of the multilevel field interpolation algorithm to large PEC structures in 2-D","authors":"H. Espinosa, A. Heldring, J. Rius","doi":"10.1109/APS.2007.4396819","DOIUrl":"https://doi.org/10.1109/APS.2007.4396819","url":null,"abstract":"The application of the Method of Moments to the analysis of large PEC structures is difficult due to the computational requirements when the structure is discretized in a high number of unknowns. To solve this problem we propose the Multilevel Field Interpolation Algorithm (MLFIA) based on a source domain decomposition that permits a fast matrix-vector multiplication within the iterative solution that reduces the computational complexity and the memory requirements to O(NlogN). The execution of the algorithm is composed of five steps that follow the computation of the field evaluated at a set of evaluation points within the observation domain, the extraction of the Green's function, the interpolation of the fields, the restoration of the Green's function and finally the aggregation of the fields. The algorithm is applied to the fast solution of 2D problems. The generalization to 3D problems is straightforward.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127463945","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 : 2007-06-09DOI: 10.1109/APS.2007.4396595
Wan-Lae Roh, J. Woo
Today, the advancement speed of wireless communication system is accelerated and consumers want a communication service without limit of space. A portable satellite communication service is required with the need and miniaturization of a mobile terminal is more important. The previous antenna for a satellite communication terminal, such as the Quadrifilar Helix antenna, is used but it is not suitable for portable by its huge volume To solve this problem, in this paper, miniaturizing a microstrip patch antenna with 3-dimensional structure is explained that it has a small volume, a low position, light weight, and mass production. Generally, since the size of a microstrip patch antenna is in proportion with the wavelength of a center frequency, a high permittivity dielectric is utilized for miniaturization of an antenna. However, this method causes drops of a radiating efficiency and bandwidth by the high permittivity. Therefore, folded structure and a method of using a plate attached in the bottom of an antenna are mixed rather than using a high dielectric. It is that a plate is attached on the edge of a folded antenna's patch. Also, to minimize an antenna, a method of folded structure is applied to resonance length L and width W in a general patch antenna.
{"title":"Miniaturization of microstrip antenna using folded structure with attaching plates for satellite communication terminal","authors":"Wan-Lae Roh, J. Woo","doi":"10.1109/APS.2007.4396595","DOIUrl":"https://doi.org/10.1109/APS.2007.4396595","url":null,"abstract":"Today, the advancement speed of wireless communication system is accelerated and consumers want a communication service without limit of space. A portable satellite communication service is required with the need and miniaturization of a mobile terminal is more important. The previous antenna for a satellite communication terminal, such as the Quadrifilar Helix antenna, is used but it is not suitable for portable by its huge volume To solve this problem, in this paper, miniaturizing a microstrip patch antenna with 3-dimensional structure is explained that it has a small volume, a low position, light weight, and mass production. Generally, since the size of a microstrip patch antenna is in proportion with the wavelength of a center frequency, a high permittivity dielectric is utilized for miniaturization of an antenna. However, this method causes drops of a radiating efficiency and bandwidth by the high permittivity. Therefore, folded structure and a method of using a plate attached in the bottom of an antenna are mixed rather than using a high dielectric. It is that a plate is attached on the edge of a folded antenna's patch. Also, to minimize an antenna, a method of folded structure is applied to resonance length L and width W in a general patch antenna.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127486282","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 : 2007-06-09DOI: 10.1109/APS.2007.4396268
J. Bossard, Yan Tang, D. Werner, T. Mayer
A metallodielectric frequency selective surfaces (FSS) filter was optimized by a genetic algorithm (GA) to have dual stopbands in the mid-IR. Fabrication and measurement of this design demonstrated excellent filter properties with greater than 10 dB attenuation in the stopbands. However, blooming of the metallic patches resulted in a frequency shift in the measured response. Efforts are currently underway to improve the fabrication process so that the fabricated structures are faithful to the design parameters.
{"title":"Genetically designed multiband metallodielectric frequency selective surface filters for the mid-infrared","authors":"J. Bossard, Yan Tang, D. Werner, T. Mayer","doi":"10.1109/APS.2007.4396268","DOIUrl":"https://doi.org/10.1109/APS.2007.4396268","url":null,"abstract":"A metallodielectric frequency selective surfaces (FSS) filter was optimized by a genetic algorithm (GA) to have dual stopbands in the mid-IR. Fabrication and measurement of this design demonstrated excellent filter properties with greater than 10 dB attenuation in the stopbands. However, blooming of the metallic patches resulted in a frequency shift in the measured response. Efforts are currently underway to improve the fabrication process so that the fabricated structures are faithful to the design parameters.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124738553","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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