Pub Date : 2009-05-02DOI: 10.1109/IWAT.2009.4906934
P. Ramachandran, O. Bengtsson, C. Beckman
In this paper we present a single tuner based load-pull method for characterization of optimal antenna load impedance in mobile terminals. In the proposed load-pull set-up the mobile terminal itself is used as a source. The presented method can provide valuable data for antenna design since it determines the optimal impedance at the antenna connector/pad taken into account the full output circuitry of the mobile terminal. It reveals the modification of the power amplifier, PA, output impedance caused by the presence of SAW filter, antenna switch, and transmission line possibly present between the PA and the antenna. With the presented method it is not only possible to characterize the optimum antenna impedance to be presented to the terminal' PA in different bands and channels but also to reveal the impedance miss-match sensitivity of the PA for each channel.
{"title":"Impedance determination of terminal power amplifiers for optimal antenna matching using load-pull method","authors":"P. Ramachandran, O. Bengtsson, C. Beckman","doi":"10.1109/IWAT.2009.4906934","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906934","url":null,"abstract":"In this paper we present a single tuner based load-pull method for characterization of optimal antenna load impedance in mobile terminals. In the proposed load-pull set-up the mobile terminal itself is used as a source. The presented method can provide valuable data for antenna design since it determines the optimal impedance at the antenna connector/pad taken into account the full output circuitry of the mobile terminal. It reveals the modification of the power amplifier, PA, output impedance caused by the presence of SAW filter, antenna switch, and transmission line possibly present between the PA and the antenna. With the presented method it is not only possible to characterize the optimum antenna impedance to be presented to the terminal' PA in different bands and channels but also to reveal the impedance miss-match sensitivity of the PA for each channel.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115499613","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 : 2009-03-02DOI: 10.1109/IWAT.2009.4906931
Cheng-Jung Lee, A. Gummalla, M. Achour
This paper presents a dualband MIMO antenna subsystem which employs two dualband metamaterial antenna elements and a directional coupler. The strong coupling between adjacent antennas due to their close proximity is reduced to achieve the full potential of using MIMO antenna array. The measured isolation is less than −13dB and radiation efficiency is more than 50% at both bands. The far-field envelope correlation is also studied in this paper.
{"title":"Compact dualband antenna subsystem for MIMO application","authors":"Cheng-Jung Lee, A. Gummalla, M. Achour","doi":"10.1109/IWAT.2009.4906931","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906931","url":null,"abstract":"This paper presents a dualband MIMO antenna subsystem which employs two dualband metamaterial antenna elements and a directional coupler. The strong coupling between adjacent antennas due to their close proximity is reduced to achieve the full potential of using MIMO antenna array. The measured isolation is less than −13dB and radiation efficiency is more than 50% at both bands. The far-field envelope correlation is also studied in this paper.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115761640","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 : 2009-03-02DOI: 10.1109/IWAT.2009.4906876
Akiyoshi Abe, N. Michishita, Yoshihide Yamada, J. Muramatsu, Toshiaki Watanabe, Kazuo Sato
In this study, a composite right-/left-handed transmission line (CRLH TL) is used as a parasitic element. It is shown that a right-handed (RH) dipole antenna with the CRLH parasitic element has band rejection characteristics. Moreover, transmission characteristics and electric field distribution confirm that mutual coupling between the two dipole antennas can be reduced by using CRLH parasitic elements between the two antennas.
{"title":"Mutual coupling reduction between two dipole antennas with parasitic elements composed of composite right-/left-handed transmission lines","authors":"Akiyoshi Abe, N. Michishita, Yoshihide Yamada, J. Muramatsu, Toshiaki Watanabe, Kazuo Sato","doi":"10.1109/IWAT.2009.4906876","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906876","url":null,"abstract":"In this study, a composite right-/left-handed transmission line (CRLH TL) is used as a parasitic element. It is shown that a right-handed (RH) dipole antenna with the CRLH parasitic element has band rejection characteristics. Moreover, transmission characteristics and electric field distribution confirm that mutual coupling between the two dipole antennas can be reduced by using CRLH parasitic elements between the two antennas.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"448 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114959145","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 : 2009-03-02DOI: 10.1109/IWAT.2009.4906969
B. Collins
Many mobile service providers are planning to introduce digital television services over the next few years. The reception of UHF TV signals on mobile user devices will require new electrically small antennas capable of operating over a wide frequency band. This paper describes the problems to be overcome and proposes solutions for further development.
{"title":"Small antennas for the reception of future mobile television services","authors":"B. Collins","doi":"10.1109/IWAT.2009.4906969","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906969","url":null,"abstract":"Many mobile service providers are planning to introduce digital television services over the next few years. The reception of UHF TV signals on mobile user devices will require new electrically small antennas capable of operating over a wide frequency band. This paper describes the problems to be overcome and proposes solutions for further development.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"143 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122674425","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 : 2009-03-02DOI: 10.1109/IWAT.2009.4906891
Sung-soo Nam, Hong-min Lee
In this paper, a composite right/left-handed (CRLH) transmission line (TL) structure is used for the design of broadband leaky-wave antenna, using Low temperature co-fired ceramic (LTCC) technology. The proposed CRLH TL unit cell consists of a metal-insulator-metal (MIM) capacitor to realize left-handed (LH) series capacitance and a shorted-stub shunt arm to realize LH shunt inductance and total three cells are used for the antenna design. The proposed antenna has very compact size (total size; 24.2 mm x 25 mm, unit cell size p is 7.2 mm, p ≈ λg/9). This antenna is designed for wide bandwidth and omni-directional radiation pattern. The measured result shows that the prototype antenna has wide impedance band-width of 100 %, near omni directional radiation pattern and maximum gain of − 0.3 dBi. The proposed small antenna structure can be applied to RF/MMIC applications.
本文采用低温共烧陶瓷(LTCC)技术，采用左/右复合传输线(CRLH)结构设计宽带漏波天线。该天线单元由金属-绝缘体-金属(MIM)电容组成，实现左旋(LH)串联电容;由短短分路臂组成，实现左旋(LH)分路电感。所提出的天线具有非常紧凑的尺寸(总尺寸;24.2 mm × 25mm，单位电池尺寸p为7.2 mm, p≈λg/9)。该天线设计用于宽带和全向辐射方向图。测量结果表明，原型天线具有100%的宽阻抗带，近全向辐射方向图，最大增益为−0.3 dBi。所提出的小型天线结构可应用于射频/MMIC应用。
{"title":"Composite right/left-handed transmission line leaky-wave antenna using LTCC technology","authors":"Sung-soo Nam, Hong-min Lee","doi":"10.1109/IWAT.2009.4906891","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906891","url":null,"abstract":"In this paper, a composite right/left-handed (CRLH) transmission line (TL) structure is used for the design of broadband leaky-wave antenna, using Low temperature co-fired ceramic (LTCC) technology. The proposed CRLH TL unit cell consists of a metal-insulator-metal (MIM) capacitor to realize left-handed (LH) series capacitance and a shorted-stub shunt arm to realize LH shunt inductance and total three cells are used for the antenna design. The proposed antenna has very compact size (total size; 24.2 mm x 25 mm, unit cell size p is 7.2 mm, p ≈ λg/9). This antenna is designed for wide bandwidth and omni-directional radiation pattern. The measured result shows that the prototype antenna has wide impedance band-width of 100 %, near omni directional radiation pattern and maximum gain of − 0.3 dBi. The proposed small antenna structure can be applied to RF/MMIC applications.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122876331","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 : 2009-03-02DOI: 10.1109/IWAT.2009.4906970
Q. Xue, S. Qu, C. Chan
For wideband antennas with unidirectional patterns, it is a troublesome problem to stabilize the antenna patterns across a very large frequency band. In our work, cavity-backed structures are utilized with bowtie exciters. The patterns of the proposed cavity-backed triangular bowtie antenna (TBA) with rounded corners can be stabilized within a 92% frequency band without side lobes, by placing a circular ring between the ground plane of the cavity and the TBA. Similar performances can also be achieved by a dual-folded TBA backed by the same cavity. Much wider available bandwidth can be achieved by employing complex cavity.
{"title":"Wideband cavity-backed bowtie antennas","authors":"Q. Xue, S. Qu, C. Chan","doi":"10.1109/IWAT.2009.4906970","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906970","url":null,"abstract":"For wideband antennas with unidirectional patterns, it is a troublesome problem to stabilize the antenna patterns across a very large frequency band. In our work, cavity-backed structures are utilized with bowtie exciters. The patterns of the proposed cavity-backed triangular bowtie antenna (TBA) with rounded corners can be stabilized within a 92% frequency band without side lobes, by placing a circular ring between the ground plane of the cavity and the TBA. Similar performances can also be achieved by a dual-folded TBA backed by the same cavity. Much wider available bandwidth can be achieved by employing complex cavity.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129768940","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 : 2009-03-02DOI: 10.1109/IWAT.2009.4906894
T. Kataria, D. Murthy, A. Chávez
In this paper we present an ultra compact monopole UWB antenna integrated with a filtering structure based on SIC technology and metamaterial transmission line. Preliminary simulation results of the filtering structure and experimental results of the antenna are presented along with design procedure.
{"title":"Compact ultra wide band antenna with filtering structure using metamaterial (MTM) and substrate integrated circuit (SIC) technologies","authors":"T. Kataria, D. Murthy, A. Chávez","doi":"10.1109/IWAT.2009.4906894","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906894","url":null,"abstract":"In this paper we present an ultra compact monopole UWB antenna integrated with a filtering structure based on SIC technology and metamaterial transmission line. Preliminary simulation results of the filtering structure and experimental results of the antenna are presented along with design procedure.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128430462","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 : 2009-03-02DOI: 10.1109/IWAT.2009.4906885
Ming-Yun Lv, Min-jie Huang, Jun Huang, Zhe Wu
This paper proposed a proof for the existence of dual-band characteristic of the combined element FSS which contains two simple elements in each unit cell in particular condition, and provided an explicit relationship between the resonance frequencies of combined element FSS and the member element FSSs. Serials of experiments showed that this conclusion was not only suitable for the no dielectric support cases, but also worked well in predicting the frequency response of dielectric loaded FSSs, and no exception has been found up to now.
{"title":"Study on the dual-band characteristic of combined element based frequency selective surfaces","authors":"Ming-Yun Lv, Min-jie Huang, Jun Huang, Zhe Wu","doi":"10.1109/IWAT.2009.4906885","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906885","url":null,"abstract":"This paper proposed a proof for the existence of dual-band characteristic of the combined element FSS which contains two simple elements in each unit cell in particular condition, and provided an explicit relationship between the resonance frequencies of combined element FSS and the member element FSSs. Serials of experiments showed that this conclusion was not only suitable for the no dielectric support cases, but also worked well in predicting the frequency response of dielectric loaded FSSs, and no exception has been found up to now.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129458506","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 : 2009-03-02DOI: 10.1109/IWAT.2009.4906905
P. Tichit, S. Burokur, A. Lustrac
Spatial coordinate transformation is used as a reliable tool to control electromagnetic fields. In this paper, we derive the permeability and permittivity tensors of a metamaterial able to transform a dipole source radiating isotropically to an ultra-directive antenna. We show how its directivity is enhanced when the wavelength is sufficiently small compared to the width of the metamaterial. Numerical simulations using Comsol Multiphysics are performed to illustrate these properties.
{"title":"Design of an ultra-directive antenna using spatial coordinate transformation","authors":"P. Tichit, S. Burokur, A. Lustrac","doi":"10.1109/IWAT.2009.4906905","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906905","url":null,"abstract":"Spatial coordinate transformation is used as a reliable tool to control electromagnetic fields. In this paper, we derive the permeability and permittivity tensors of a metamaterial able to transform a dipole source radiating isotropically to an ultra-directive antenna. We show how its directivity is enhanced when the wavelength is sufficiently small compared to the width of the metamaterial. Numerical simulations using Comsol Multiphysics are performed to illustrate these properties.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121199057","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 : 2009-03-02DOI: 10.1109/IWAT.2009.4906941
M. Dahmardeh, A. Ghorbani, A. Abdipour
This paper presents a slow-wave low-noise active receiving antenna with defected ground structure (DGS) and photonic bandgap (PBG). The integrated design of a low noise amplifier (LNA) stage and an enhanced patch antenna is presented. The antenna consists of a microstrip patch integrated with one-dimensional DGS in ground plane and two-dimensional PBG. It is demonstrated that application of DGS and PBG eliminates the second and third harmonics and improve the return loss level. Moreover, the combination use of PBG and DGS decreases the occupied area by 61%. Also, by adopting DGS pattern on the ground plane, the length of the output matching network of the LNA shortened by about 39%, while maintaining the matching and performances of the amplifier. This, also, eliminates the third harmonic.
{"title":"Active integrated antenna enhanced using photonic bandgap and defected ground structure","authors":"M. Dahmardeh, A. Ghorbani, A. Abdipour","doi":"10.1109/IWAT.2009.4906941","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906941","url":null,"abstract":"This paper presents a slow-wave low-noise active receiving antenna with defected ground structure (DGS) and photonic bandgap (PBG). The integrated design of a low noise amplifier (LNA) stage and an enhanced patch antenna is presented. The antenna consists of a microstrip patch integrated with one-dimensional DGS in ground plane and two-dimensional PBG. It is demonstrated that application of DGS and PBG eliminates the second and third harmonics and improve the return loss level. Moreover, the combination use of PBG and DGS decreases the occupied area by 61%. Also, by adopting DGS pattern on the ground plane, the length of the output matching network of the LNA shortened by about 39%, while maintaining the matching and performances of the amplifier. This, also, eliminates the third harmonic.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134016030","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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