Pub Date : 2009-03-02DOI: 10.1109/IWAT.2009.4906908
Chi-Yuk Chiu, R. Murch
A technique of designing a slot antenna with multi-band operation is described in this paper first. The design is based on introducing a short circuit point on the slot antenna for each additional required frequency band of operation. This will create different effective electrical slot lengths from a single-feed resonant slot. Examples of dual-band and tri-band slot antennas are provided. A feature of the proposed approach is that similar broadside radiation patterns are produced for each frequency band. Additionally the ratios between the frequency bands are flexible and easily designed. Then, by making the short circuit points in open or short states with switches, the proposed slot antenna is able to change the frequency response from single-band to multi-band operation.
{"title":"Reconfigurable slot antenna using switched stub technique","authors":"Chi-Yuk Chiu, R. Murch","doi":"10.1109/IWAT.2009.4906908","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906908","url":null,"abstract":"A technique of designing a slot antenna with multi-band operation is described in this paper first. The design is based on introducing a short circuit point on the slot antenna for each additional required frequency band of operation. This will create different effective electrical slot lengths from a single-feed resonant slot. Examples of dual-band and tri-band slot antennas are provided. A feature of the proposed approach is that similar broadside radiation patterns are produced for each frequency band. Additionally the ratios between the frequency bands are flexible and easily designed. Then, by making the short circuit points in open or short states with switches, the proposed slot antenna is able to change the frequency response from single-band to multi-band operation.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"10 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":"133429796","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.2009.4906968
X. Qing, C. K. Goh, Zhi Ning Chen
A methodology to measure UHF RFID tag antenna impedance using network approach is presented. The balanced UHF RFID tag antenna is considered as a two-port network and the impedance of the antenna is characterized by network parameters. In the measurement, the balanced antenna is connected to the two ports of a two-port vector network analyzer (VNA) through a test fixture. The influence of the test fixture is de-embedded by using a portextension technique and then the antenna impedance is extracted directly from the measured S-parameters. The proposed method is validated by comparing the measured and the simulated impedance of an asymmetrical dipole antenna and a symmetrical meander line dipole antenna both for UHF RFID tags.
{"title":"Measurement of UHF RFID tag antenna impedance","authors":"X. Qing, C. K. Goh, Zhi Ning Chen","doi":"10.1109/IWAT.2009.4906968","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906968","url":null,"abstract":"A methodology to measure UHF RFID tag antenna impedance using network approach is presented. The balanced UHF RFID tag antenna is considered as a two-port network and the impedance of the antenna is characterized by network parameters. In the measurement, the balanced antenna is connected to the two ports of a two-port vector network analyzer (VNA) through a test fixture. The influence of the test fixture is de-embedded by using a portextension technique and then the antenna impedance is extracted directly from the measured S-parameters. The proposed method is validated by comparing the measured and the simulated impedance of an asymmetrical dipole antenna and a symmetrical meander line dipole antenna both for UHF RFID tags.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"500 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":"127591180","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.2009.4906947
J. Holopainen, R. Valkonen, C. Icheln, O. Kivekas, P. Vainikainen
This paper reviews different recent approaches taken towards the realisation of space-efficient antenna structures for mobile terminals without the use of traditional self-resonant antenna structures, but instead by coupling the RF power directly to the wavemodes of a regular-sized terminal chassis. Several realisations of possible coupling structures are presented. In order to re-use the same coupling structure for several desired radio systems, reconfigurable matching circuitries have to be designed and optimised, which is a challenge that is highlighted in this paper. Also, the effect that the user's hands have on the impedance and radiation characteristics of a coupling-based DVB-H antenna structure is investigated. This knowledge can facilitate the optimal design of the mentioned tuneable matching circuitry for coping with the many possible usage scenarios.
{"title":"Recent advances in coupling-based antenna structures for mobile terminals","authors":"J. Holopainen, R. Valkonen, C. Icheln, O. Kivekas, P. Vainikainen","doi":"10.1109/IWAT.2009.4906947","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906947","url":null,"abstract":"This paper reviews different recent approaches taken towards the realisation of space-efficient antenna structures for mobile terminals without the use of traditional self-resonant antenna structures, but instead by coupling the RF power directly to the wavemodes of a regular-sized terminal chassis. Several realisations of possible coupling structures are presented. In order to re-use the same coupling structure for several desired radio systems, reconfigurable matching circuitries have to be designed and optimised, which is a challenge that is highlighted in this paper. Also, the effect that the user's hands have on the impedance and radiation characteristics of a coupling-based DVB-H antenna structure is investigated. This knowledge can facilitate the optimal design of the mentioned tuneable matching circuitry for coping with the many possible usage scenarios.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"37 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":"127610928","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.2009.4906896
S. Clavijo, B. Bosco
In today's 60GHz radios large signal to noise ratios are needed due to the high atmospheric losses inherent to 60GHz communications. This paper tackles the isolation of leakage noise from the transmitter to the receiver by means of a reactive surface. We achieved the aforementioned by using a variation of the Artificial Magnetic Conductor (AMC) on a one layer Liquid Crystal Polymer (LCP) substrate. It is proven that in order to achieve noise suppression the artificial material does not require a high-impedance surface.
{"title":"Noise suppression through a reactive surface for 60GHz radios","authors":"S. Clavijo, B. Bosco","doi":"10.1109/IWAT.2009.4906896","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906896","url":null,"abstract":"In today's 60GHz radios large signal to noise ratios are needed due to the high atmospheric losses inherent to 60GHz communications. This paper tackles the isolation of leakage noise from the transmitter to the receiver by means of a reactive surface. We achieved the aforementioned by using a variation of the Artificial Magnetic Conductor (AMC) on a one layer Liquid Crystal Polymer (LCP) substrate. It is proven that in order to achieve noise suppression the artificial material does not require a high-impedance surface.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"29 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":"114400426","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.2009.4906972
D. Manteuffel, M. Arnold, Y. Makris, Zhi-Ning Chen
Some key aspects of two different concepts of configurable antennas for future mobile terminal have been addressed in this paper. It has been shown that a coupling element in combination with a configurable tuning circuit can be used to excite the chassis of the mobile terminal to act as the entire antenna in many different frequency bands. However, when both the coupling element and the tuneable circuit elements are combined in a compact LTCC antenna component the achievable antenna efficiency is quite weak.
{"title":"Concepts for future multistandard and ultra wideband mobile terminal antennas using multilayer LTCC technology","authors":"D. Manteuffel, M. Arnold, Y. Makris, Zhi-Ning Chen","doi":"10.1109/IWAT.2009.4906972","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906972","url":null,"abstract":"Some key aspects of two different concepts of configurable antennas for future mobile terminal have been addressed in this paper. It has been shown that a coupling element in combination with a configurable tuning circuit can be used to excite the chassis of the mobile terminal to act as the entire antenna in many different frequency bands. However, when both the coupling element and the tuneable circuit elements are combined in a compact LTCC antenna component the achievable antenna efficiency is quite weak.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"10 5 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":"123833934","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.2009.4906925
K. Noguchi, T. Moroya, M. Mizusawa, S. Betsudan, S. Makino, Takurou Sasaki
RFID usage is steadily increasing in the world, and its frequency bands are assigned in each country. RFID in UHF band is mainly used in 900MHz band. Allocated frequency bands of Europe, the USA and Japan are included from 860 to 960MHz. Broadbanding of the IC and antenna is needed to manage the worldwide RFID frequency band. This paper proposes broadband matching of a RFID antenna by using a T-type circuit. The antenna consists of a meander-line and a T-type circuit that realizes conjugate impedance matching to the IC impedance. Equivalent circuits of the antenna are shown and evaluated by parametric study. Prototype of the antenna is realized and its numerical analyses are examined.
{"title":"Broadband matching of a RFID antenna by using a T-type circuit","authors":"K. Noguchi, T. Moroya, M. Mizusawa, S. Betsudan, S. Makino, Takurou Sasaki","doi":"10.1109/IWAT.2009.4906925","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906925","url":null,"abstract":"RFID usage is steadily increasing in the world, and its frequency bands are assigned in each country. RFID in UHF band is mainly used in 900MHz band. Allocated frequency bands of Europe, the USA and Japan are included from 860 to 960MHz. Broadbanding of the IC and antenna is needed to manage the worldwide RFID frequency band. This paper proposes broadband matching of a RFID antenna by using a T-type circuit. The antenna consists of a meander-line and a T-type circuit that realizes conjugate impedance matching to the IC impedance. Equivalent circuits of the antenna are shown and evaluated by parametric study. Prototype of the antenna is realized and its numerical analyses are examined.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"216 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":"122517947","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.2009.4906976
N. Guan, Zhanghuan Li, D. Delaune, H. Furuya, K. Ito
A film-antenna capable of generating two wide resonant modes for covering the AMPS/GSM bands and the DCS/PCS/ UMTS bands for mobile phones is proposed. The antenna consists of two superimposed radiating arms which can support two resonant modes by themselves. The frequency range of a resonant mode generated by one of the arm is arranged to differ a little with the corresponding mode of the other, at the fundamental and higher-order modes. As a result, the bandwidths at both of the resonant modes are significantly enhanced. The antenna has a dimension of 5×15×40 mm3 and shows fairly good omni-directional radiation patterns at all the operating bands.
{"title":"Bandwidth enhancement of a compact multiband film-antenna for mobile phones","authors":"N. Guan, Zhanghuan Li, D. Delaune, H. Furuya, K. Ito","doi":"10.1109/IWAT.2009.4906976","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906976","url":null,"abstract":"A film-antenna capable of generating two wide resonant modes for covering the AMPS/GSM bands and the DCS/PCS/ UMTS bands for mobile phones is proposed. The antenna consists of two superimposed radiating arms which can support two resonant modes by themselves. The frequency range of a resonant mode generated by one of the arm is arranged to differ a little with the corresponding mode of the other, at the fundamental and higher-order modes. As a result, the bandwidths at both of the resonant modes are significantly enhanced. The antenna has a dimension of 5×15×40 mm3 and shows fairly good omni-directional radiation patterns at all the operating bands.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"63 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":"120969220","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.2009.4906890
Hualiang Zhang, R. Ziolkowski, H. Xin
A uni-planar, easy for integration and compact antenna for millimeter wave applications is presented in this paper. The concept of metamaterials is employed to realize the antenna miniaturization. For the designed antenna, a small rectangular semi-loop performs as the radiating element. Metamaterial-inspired parallel strips are introduced that are coupled to the original antenna. It is found that, with this modification, the total size of the antenna is reduced and the impedance matching of the whole antenna system is improved. To further show the impact of ground plane size, the proposed antenna is simulated with different ground plane sizes. In addition, by using the Wheeler-cap method and full-wave electromagnetic simulations, it is found the proposed antenna exhibits high radiation efficiency at the working frequencies.
{"title":"A compact metamaterial-inspired mmW CPW-fed antenna","authors":"Hualiang Zhang, R. Ziolkowski, H. Xin","doi":"10.1109/IWAT.2009.4906890","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906890","url":null,"abstract":"A uni-planar, easy for integration and compact antenna for millimeter wave applications is presented in this paper. The concept of metamaterials is employed to realize the antenna miniaturization. For the designed antenna, a small rectangular semi-loop performs as the radiating element. Metamaterial-inspired parallel strips are introduced that are coupled to the original antenna. It is found that, with this modification, the total size of the antenna is reduced and the impedance matching of the whole antenna system is improved. To further show the impact of ground plane size, the proposed antenna is simulated with different ground plane sizes. In addition, by using the Wheeler-cap method and full-wave electromagnetic simulations, it is found the proposed antenna exhibits high radiation efficiency at the working frequencies.","PeriodicalId":166472,"journal":{"name":"2009 IEEE International Workshop on Antenna Technology","volume":"9 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":"126982609","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.2009.4906920
Chuyong Lee, Chihyun Cho, J. Ryoo, I. Park, H. Choo
In this paper we propose a novel planar near-field antenna for radio-frequency identification (RFID) based on the principle that two closely spaced opposite-directed currents (ODC) can generate a strong magnetic field over a broad surface area. To implement the ODC concept, the proposed antenna uses a dipole and a parasitic patch with a microstrip feedline. The proposed antenna provides an Hz field greater than −20 dBA/m in a region of 30 × 30 cm2. Measurements with a commercial RFID system show a maximum reading range of 24 cm, and a reading area of 744 cm2 for a reading range greater than 5 cm.
{"title":"Planar near-field RFID reader antenna using opposite-directed currents","authors":"Chuyong Lee, Chihyun Cho, J. Ryoo, I. Park, H. Choo","doi":"10.1109/IWAT.2009.4906920","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906920","url":null,"abstract":"In this paper we propose a novel planar near-field antenna for radio-frequency identification (RFID) based on the principle that two closely spaced opposite-directed currents (ODC) can generate a strong magnetic field over a broad surface area. To implement the ODC concept, the proposed antenna uses a dipole and a parasitic patch with a microstrip feedline. The proposed antenna provides an Hz field greater than −20 dBA/m in a region of 30 × 30 cm2. Measurements with a commercial RFID system show a maximum reading range of 24 cm, and a reading area of 744 cm2 for a reading range greater than 5 cm.","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":"125858695","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.2009.4906946
B. K. Lau, J. Andersen
The effective use of multiple antenna systems in compact terminal devices is plagued by the problems of mutual coupling and spatial correlation. Consequently, increasing the number of antennas per unit volume results in rapidly diminishing returns after an upper limit is reached. We review recent advances on this topic of closely coupled antennas, including several existing techniques that may be used to push the boundary further, such that closely spaced antennas can still give good performance. A new approach of decoupling closely spaced antennas is also introduced.
{"title":"Unleashing multiple antenna systems in compact terminal devices","authors":"B. K. Lau, J. Andersen","doi":"10.1109/IWAT.2009.4906946","DOIUrl":"https://doi.org/10.1109/IWAT.2009.4906946","url":null,"abstract":"The effective use of multiple antenna systems in compact terminal devices is plagued by the problems of mutual coupling and spatial correlation. Consequently, increasing the number of antennas per unit volume results in rapidly diminishing returns after an upper limit is reached. We review recent advances on this topic of closely coupled antennas, including several existing techniques that may be used to push the boundary further, such that closely spaced antennas can still give good performance. A new approach of decoupling closely spaced antennas is also introduced.","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":"129091366","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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