Pub Date : 2007-03-21DOI: 10.1109/IWAT.2007.370175
Shaopeng Feng, Jingyang Lv, Yanwen Wang, P. Gong, Weilin Wu
In this paper, we present an iterative algorithm of channel estimation for MIMO-OFDM systems based on discrete cosine transform (DCT). By exploiting the properties of DCT, the proposed method mitigates the aliasing effect introduced in discrete Fourier transform (DFT)-based channel estimation method. Further more, the proposed algorithm reduces the additive white Gaussian noise (AWGN) and inter-carrier interference (ICl) significantly by iteration. Simulation results show that the proposed method provides good MSE performance.
{"title":"An Iterative Algorithm of Channel Estimation for MIMO-OFDM Systems Based on Discrete Cosine Transform","authors":"Shaopeng Feng, Jingyang Lv, Yanwen Wang, P. Gong, Weilin Wu","doi":"10.1109/IWAT.2007.370175","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370175","url":null,"abstract":"In this paper, we present an iterative algorithm of channel estimation for MIMO-OFDM systems based on discrete cosine transform (DCT). By exploiting the properties of DCT, the proposed method mitigates the aliasing effect introduced in discrete Fourier transform (DFT)-based channel estimation method. Further more, the proposed algorithm reduces the additive white Gaussian noise (AWGN) and inter-carrier interference (ICl) significantly by iteration. Simulation results show that the proposed method provides good MSE performance.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"106 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116742166","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370135
Y. Ge, K. Esselle, T. Bird
Two wideband stacked rectangular dielectric resonator antenna (DRA) designs are presented. These DRAs are excited by a coaxial probe and small square metallic patch connected with a coaxial probe respectively. Simulated results show that over 80% matching bandwidth can be achieved by these designs
{"title":"Wideband Stacked Dielectric Resonator Antennas","authors":"Y. Ge, K. Esselle, T. Bird","doi":"10.1109/IWAT.2007.370135","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370135","url":null,"abstract":"Two wideband stacked rectangular dielectric resonator antenna (DRA) designs are presented. These DRAs are excited by a coaxial probe and small square metallic patch connected with a coaxial probe respectively. Simulated results show that over 80% matching bandwidth can be achieved by these designs","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131069815","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370137
W. Liu, R. Wu, R. Langley
A beamspace adaptive planar array for broadband beamforming based on the frequency invariant beamforming technique is proposed. The relationship between the dimension of the two-dimensional (2-D) prototype filter for the beam design and the number of independent beams is discussed and an arrangement of the desired frequency invariant responses for beamspace processing is provided, which guarantees the linear independence of the beams. Simulation results show the effectiveness of the method with increased convergence speed and a resultant frequency invariant beam pattern
{"title":"Beamspace Adaptive Beamforming for Broadband Planar Arrays","authors":"W. Liu, R. Wu, R. Langley","doi":"10.1109/IWAT.2007.370137","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370137","url":null,"abstract":"A beamspace adaptive planar array for broadband beamforming based on the frequency invariant beamforming technique is proposed. The relationship between the dimension of the two-dimensional (2-D) prototype filter for the beam design and the number of independent beams is discussed and an arrangement of the desired frequency invariant responses for beamspace processing is provided, which guarantees the linear independence of the beams. Simulation results show the effectiveness of the method with increased convergence speed and a resultant frequency invariant beam pattern","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"97 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132025814","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370068
K. Fujimoto
In this paper, small antennas (SA) are treated with a wide concept, in which not only electrically small antennas (ESA), but also SA's categorized in terms of dimensions and functions are included. Essentials of SA are discussed pertaining to the fundamentals of SA and realization of SA. Matching and resonance are taken as the significant issues in SA. Investigation of the radiation mechanism of an antenna system and study of the calculation of energy flow from an antenna are proposed as one of the clues to look into the essentials of SA. Typical structures to create ESA are shown and some practical examples of SA are introduced. Future perspectives are briefly discussed.
{"title":"Modern Small Antenna Engieering","authors":"K. Fujimoto","doi":"10.1109/IWAT.2007.370068","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370068","url":null,"abstract":"In this paper, small antennas (SA) are treated with a wide concept, in which not only electrically small antennas (ESA), but also SA's categorized in terms of dimensions and functions are included. Essentials of SA are discussed pertaining to the fundamentals of SA and realization of SA. Matching and resonance are taken as the significant issues in SA. Investigation of the radiation mechanism of an antenna system and study of the calculation of energy flow from an antenna are proposed as one of the clues to look into the essentials of SA. Typical structures to create ESA are shown and some practical examples of SA are introduced. Future perspectives are briefly discussed.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128663150","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370179
S. K. Parui, S. Das
A selective bandpass filter is presented by using a pairs of open loop resonators, each has a perimeter about half-wavelength. For the improvement of bandwidth, we have used a DGS under coupled area. A prototype filter circuit of center frequency at 1.8 GHz has been fabricated with PTFE substrate. Measured result shows bandwidth of 200 MHz with insertion loss of 0.2 dB at center frequency of 1.95 GHz. We have used defected ground structures under feed lines for extra stopband rejection mode to the 2nd and 3rd harmonics of the filter with attenuation losses over than -25 dB, without affecting the center frequency and insertion loss of the originally designed filter.
{"title":"Performance Enhancement of Microstrip Open Loop Resonator Band Pass Filter By Defected Ground structures","authors":"S. K. Parui, S. Das","doi":"10.1109/IWAT.2007.370179","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370179","url":null,"abstract":"A selective bandpass filter is presented by using a pairs of open loop resonators, each has a perimeter about half-wavelength. For the improvement of bandwidth, we have used a DGS under coupled area. A prototype filter circuit of center frequency at 1.8 GHz has been fabricated with PTFE substrate. Measured result shows bandwidth of 200 MHz with insertion loss of 0.2 dB at center frequency of 1.95 GHz. We have used defected ground structures under feed lines for extra stopband rejection mode to the 2nd and 3rd harmonics of the filter with attenuation losses over than -25 dB, without affecting the center frequency and insertion loss of the originally designed filter.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116021139","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370085
A. Thornell-Pers, P. Erlandsson
A small active controllable cellular antenna for mobile phones has been designed and evaluated. With a switch on top of the radiator different frequency bands can be chosen. The antenna is based on a dual band IFA design but number of bands are increased to four. Two different radiator branches can be activated by the switch which results in a frequency shift. In one state the antenna covers the GSM 850 MHz and 1800 MHz bands and in the other state the GSM 900 MHz and 1900 MHz bands are covered. This means the antenna size is same as a dual band antenna but it covers four frequency bands. Size is 38times7times1 mm. Adding active circuits to an antenna to achieve frequency control normally results in high losses and low gain antenna. With this solution the performance remains and radiation efficiency (gain) is very high and similar to a passive antenna
{"title":"Compact Active Multiband Cellular Antenna for Mobile Handsets","authors":"A. Thornell-Pers, P. Erlandsson","doi":"10.1109/IWAT.2007.370085","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370085","url":null,"abstract":"A small active controllable cellular antenna for mobile phones has been designed and evaluated. With a switch on top of the radiator different frequency bands can be chosen. The antenna is based on a dual band IFA design but number of bands are increased to four. Two different radiator branches can be activated by the switch which results in a frequency shift. In one state the antenna covers the GSM 850 MHz and 1800 MHz bands and in the other state the GSM 900 MHz and 1900 MHz bands are covered. This means the antenna size is same as a dual band antenna but it covers four frequency bands. Size is 38times7times1 mm. Adding active circuits to an antenna to achieve frequency control normally results in high losses and low gain antenna. With this solution the performance remains and radiation efficiency (gain) is very high and similar to a passive antenna","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116745088","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370159
K. Karlsson, J. Carlsson, P. Ankarson, Z. Ying
This paper presents a simple method for using data from full wave simulations in combination with lumped circuit models for calculating port responses for arbitrary loading and excitation conditions. Data from full wave simulations are used for constructing a matrix representation of port responses that is used in a circuit simulator code where arbitrary active and passive components can be added to the circuit. By this it is possible to evaluate different circuit configurations efficiently without the need of performing additional full wave simulations.
{"title":"Combination of Full Wave Simulations and Equivalent Circuit Models in Predicting Coupling between Antenna Element and Nearby Object in Mobile Phone","authors":"K. Karlsson, J. Carlsson, P. Ankarson, Z. Ying","doi":"10.1109/IWAT.2007.370159","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370159","url":null,"abstract":"This paper presents a simple method for using data from full wave simulations in combination with lumped circuit models for calculating port responses for arbitrary loading and excitation conditions. Data from full wave simulations are used for constructing a matrix representation of port responses that is used in a circuit simulator code where arbitrary active and passive components can be added to the circuit. By this it is possible to evaluate different circuit configurations efficiently without the need of performing additional full wave simulations.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114398895","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370156
J. Wu, S. Khamas, G. Cook
A conformal Archimedian spiral antenna above a cylindrical groundplane is modelled using a curved segment moment method incorporating closed form Green's functions to describe the cylinder for maximum computational efficiency. Asymptotic input impedances agree well with a planar geometry.
{"title":"Conformal Archimedian Spiral Antenna Above a Cylindrical Groundplane","authors":"J. Wu, S. Khamas, G. Cook","doi":"10.1109/IWAT.2007.370156","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370156","url":null,"abstract":"A conformal Archimedian spiral antenna above a cylindrical groundplane is modelled using a curved segment moment method incorporating closed form Green's functions to describe the cylinder for maximum computational efficiency. Asymptotic input impedances agree well with a planar geometry.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114485913","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370127
S. Zhong, Li‐Na Zhang, Xianling Liang
The rapid development in the WLAN communication demands novel compact antenna designs that can provide multi-band operation, such as the IEEE 802.11b/g (2.4-2.484 GHz), IEEE802.11a (5.15-5.35 GHz, 5.725-5.825 GHz), and HIPERLAN/2 (5.15-5.35 GHz, 5.47-5.725 GHz) operations. This article introduces a printed meander monopole antenna with a novel shaped profile for tri-band WLAN operation. Compared with the above mentioned monopole antennas of letter configurations, the proposed antenna has a smaller size and a wider bandwidth. Details of the antenna design and the experimental results are presented and discussed
{"title":"Compact Tri-Band Printed Monopole Antenna","authors":"S. Zhong, Li‐Na Zhang, Xianling Liang","doi":"10.1109/IWAT.2007.370127","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370127","url":null,"abstract":"The rapid development in the WLAN communication demands novel compact antenna designs that can provide multi-band operation, such as the IEEE 802.11b/g (2.4-2.484 GHz), IEEE802.11a (5.15-5.35 GHz, 5.725-5.825 GHz), and HIPERLAN/2 (5.15-5.35 GHz, 5.47-5.725 GHz) operations. This article introduces a printed meander monopole antenna with a novel shaped profile for tri-band WLAN operation. Compared with the above mentioned monopole antennas of letter configurations, the proposed antenna has a smaller size and a wider bandwidth. Details of the antenna design and the experimental results are presented and discussed","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114520254","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 : 2007-03-21DOI: 10.1109/IWAT.2007.370182
M. Neshat, D. Saeedkia, S. Safavi-Naeini
In this paper, large-aperture terahertz photoconductive antennas, placed on a hyper-hemispherical silicon lens and excited by a short, pulse laser, are studied. The behavior of the radiation field is investigated in terms of several aspects. Our study shows that the radiated field is saturated when the photo-conductivity exceeds a threshold value defined be the permittivity of the photoconductor material.
{"title":"On the Behavior of the Radiation Field from Large-Aperture Terahertz Photoconductive Antenna under Impulsive Excitation","authors":"M. Neshat, D. Saeedkia, S. Safavi-Naeini","doi":"10.1109/IWAT.2007.370182","DOIUrl":"https://doi.org/10.1109/IWAT.2007.370182","url":null,"abstract":"In this paper, large-aperture terahertz photoconductive antennas, placed on a hyper-hemispherical silicon lens and excited by a short, pulse laser, are studied. The behavior of the radiation field is investigated in terms of several aspects. Our study shows that the radiated field is saturated when the photo-conductivity exceeds a threshold value defined be the permittivity of the photoconductor material.","PeriodicalId":446281,"journal":{"name":"2007 International workshop on Antenna Technology: Small and Smart Antennas Metamaterials and Applications","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126760309","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：