Pub Date : 2012-03-05DOI: 10.1109/IWAT.2012.6178409
C. Rusch, J. Schafer, S. Beer, T. Zwick
A highly integrated W-Band Vivaldi antenna for radar systems in LTCC is presented. The antenna properties are optimized for high accuracy CW radar short distance measurements by the housing design. The presented technique allows to reduce the phase error resulting by multipath reflections and a non-linear phase front in the near field by decreasing the beamwidth using a tapered horn around the planar Vivaldi antenna. The paper describes the phase error sources and the influence of the metallic horn around the antenna. The electrical field propagation is explained and the limitations of the optimization because of higher propagating modes in the housing are determined. All results are verified by measurements.
{"title":"W-band short distance CW-radar antenna optimized by housing design","authors":"C. Rusch, J. Schafer, S. Beer, T. Zwick","doi":"10.1109/IWAT.2012.6178409","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178409","url":null,"abstract":"A highly integrated W-Band Vivaldi antenna for radar systems in LTCC is presented. The antenna properties are optimized for high accuracy CW radar short distance measurements by the housing design. The presented technique allows to reduce the phase error resulting by multipath reflections and a non-linear phase front in the near field by decreasing the beamwidth using a tapered horn around the planar Vivaldi antenna. The paper describes the phase error sources and the influence of the metallic horn around the antenna. The electrical field propagation is explained and the limitations of the optimization because of higher propagating modes in the housing are determined. All results are verified by measurements.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76274220","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 : 2012-03-05DOI: 10.1109/IWAT.2012.6178637
Y. Kim, S. Nam
To investigate the wireless power transfer, we need to analyze the antenna coupling. We derive a Z-parameter between two antennas using spherical modes and the addition theorem. We present formulas that calculate the maximum power transfer efficiency and the optimum load impedance for the antennas generating arbitrary modes. To simplify the formula, we assume that the antennas are canonical minimum scattering antennas. We find from the formula presented in this paper that the power transfer efficiency increases as the mode number and the radiation efficiency increase.
{"title":"Analysis of wireless power transfer using spherical modes","authors":"Y. Kim, S. Nam","doi":"10.1109/IWAT.2012.6178637","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178637","url":null,"abstract":"To investigate the wireless power transfer, we need to analyze the antenna coupling. We derive a Z-parameter between two antennas using spherical modes and the addition theorem. We present formulas that calculate the maximum power transfer efficiency and the optimum load impedance for the antennas generating arbitrary modes. To simplify the formula, we assume that the antennas are canonical minimum scattering antennas. We find from the formula presented in this paper that the power transfer efficiency increases as the mode number and the radiation efficiency increase.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80590416","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 : 2012-03-05DOI: 10.1109/IWAT.2012.6178662
J. Mclean, R. Sutton
It has been shown that a magnetic core in a loop antenna excludes energy from the interior reducing radiation Q and that a core with magnetic losses still provides this reduction of stored energy without excessive dissipation provided that the magnitude of the complex permeability is sufficiently large. We present a broadband, low-loss, low-profile antenna based on a lossy magneto-dielectric material, a Ni-Zn ferrite operating in its dispersion region. The antenna behaves as a magnetic dipole and a radiation efficiency of almost 65 % is obtained at a frequency for which the loss tangent of the material is greater than 10.
{"title":"An efficient, low-profile antenna employing lossy magneto-dielectric materials","authors":"J. Mclean, R. Sutton","doi":"10.1109/IWAT.2012.6178662","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178662","url":null,"abstract":"It has been shown that a magnetic core in a loop antenna excludes energy from the interior reducing radiation Q and that a core with magnetic losses still provides this reduction of stored energy without excessive dissipation provided that the magnitude of the complex permeability is sufficiently large. We present a broadband, low-loss, low-profile antenna based on a lossy magneto-dielectric material, a Ni-Zn ferrite operating in its dispersion region. The antenna behaves as a magnetic dipole and a radiation efficiency of almost 65 % is obtained at a frequency for which the loss tangent of the material is greater than 10.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81366266","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 : 2012-03-05DOI: 10.1109/IWAT.2012.6178667
H. Mirzaei, G. Eleftheriades
Three different antenna applications of non-Foster elements in resonant antennas, leaky-wave antennas and series-fed antenna arrays, are investigated. A resonant antenna is presented in which an internal tuning element is replaced with a combination of non-Foster elements in order to make the antenna wideband. Moreover, a non-dispersive fast-wave transmission line, which can be obtained by loading a host transmission line with non-Foster reactive elements, is introduced. Subsequently, the applications of such an artificial transmission line in making squint-free leaky-wave antennas is presented. Finally, the requirements of true time-delay lines for applications in series-fed antenna arrays is discussed and it is shown that the non-Foster fast-wave transmission line can meet these requirements.
{"title":"Antenna applications of non-Foster elements","authors":"H. Mirzaei, G. Eleftheriades","doi":"10.1109/IWAT.2012.6178667","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178667","url":null,"abstract":"Three different antenna applications of non-Foster elements in resonant antennas, leaky-wave antennas and series-fed antenna arrays, are investigated. A resonant antenna is presented in which an internal tuning element is replaced with a combination of non-Foster elements in order to make the antenna wideband. Moreover, a non-dispersive fast-wave transmission line, which can be obtained by loading a host transmission line with non-Foster reactive elements, is introduced. Subsequently, the applications of such an artificial transmission line in making squint-free leaky-wave antennas is presented. Finally, the requirements of true time-delay lines for applications in series-fed antenna arrays is discussed and it is shown that the non-Foster fast-wave transmission line can meet these requirements.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79126881","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 : 2012-03-05DOI: 10.1109/IWAT.2012.6178385
J. Volakis, Lanlin Zhang, Zheyu Wang, Y. Bayram
We introduce a novel class of flexible Radio Frequency (RF) electronics composed of conductive fibers on polymer or fabric substrates. The proposed fiber conductors and polymer substrates provide excellent RF characteristics, including mechanical flexibility and conformality. Key to the improved conductivity is the increased stitching density of the employed conductive fibers, reaching >;70 stitches per cm2. Prototype flexible antennas and circuits were fabricated and validated for their RF performance. These were realized by embroidering them on organza fabrics or by integrating them on thin polymer substrates. Their RF performance was found comparable to their conventional copper counterparts. Because of their excellent RF performance and high level of flexibility, these embroidered antennas should lead to a new class of devices expected to provide high data rate, low profile, and reliable operation for RF applications.
{"title":"Embroidered flexible RF electronics","authors":"J. Volakis, Lanlin Zhang, Zheyu Wang, Y. Bayram","doi":"10.1109/IWAT.2012.6178385","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178385","url":null,"abstract":"We introduce a novel class of flexible Radio Frequency (RF) electronics composed of conductive fibers on polymer or fabric substrates. The proposed fiber conductors and polymer substrates provide excellent RF characteristics, including mechanical flexibility and conformality. Key to the improved conductivity is the increased stitching density of the employed conductive fibers, reaching >;70 stitches per cm2. Prototype flexible antennas and circuits were fabricated and validated for their RF performance. These were realized by embroidering them on organza fabrics or by integrating them on thin polymer substrates. Their RF performance was found comparable to their conventional copper counterparts. Because of their excellent RF performance and high level of flexibility, these embroidered antennas should lead to a new class of devices expected to provide high data rate, low profile, and reliable operation for RF applications.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86084115","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 : 2012-03-05DOI: 10.1109/IWAT.2012.6178671
T. Jiang, Kihun Chang, Qi Tang, L. Ran, H. Xin
We have investigated microwave active negative refractive index (NRI) transmission line (also named composite right-hand / left-hand transmission line, or CRLH-TL) metamaterials incorporating gain devices to provide effective negative resistance. Our simulation and experimental results show that by inserting semiconductor tunnel diode at the unit cell level, the negative phase constant (i.e., left-handedness) of this kind of transmission lines is maintained while gain can be obtained (negative attenuation constant of transmission line) simultaneously. Important design aspects of the active metamaterial transmission lines are discussed. As a potential application, single unit-cell zeroth order resonator (ZOR) antennas based on the passive and active transmission lines are also discussed.
{"title":"Active negative refraction index (NRI) transmission line with gain","authors":"T. Jiang, Kihun Chang, Qi Tang, L. Ran, H. Xin","doi":"10.1109/IWAT.2012.6178671","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178671","url":null,"abstract":"We have investigated microwave active negative refractive index (NRI) transmission line (also named composite right-hand / left-hand transmission line, or CRLH-TL) metamaterials incorporating gain devices to provide effective negative resistance. Our simulation and experimental results show that by inserting semiconductor tunnel diode at the unit cell level, the negative phase constant (i.e., left-handedness) of this kind of transmission lines is maintained while gain can be obtained (negative attenuation constant of transmission line) simultaneously. Important design aspects of the active metamaterial transmission lines are discussed. As a potential application, single unit-cell zeroth order resonator (ZOR) antennas based on the passive and active transmission lines are also discussed.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86372859","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 : 2012-03-05DOI: 10.1109/IWAT.2012.6178414
Xianling Liang, Di Yang, R. Jin, Jun-ping Geng
A wideband strip-line-fed dielectric resonator antenna is proposed for the 60-GHz UWB communication. The antenna achieves an bandwidth of ~15%, which is sufficient to covering the 60-GHz band, and provides a stable inclined radiation pattern, with a gain of 7.1±0.3 dBi over the entire operating bandwidth. Moreover, this antenna owns a simple structure and easy to integrate with MMICs. It is very suitable for the portable device applications.
{"title":"A 60-GHz wideband dielectric resonator antenna with inclined radiation","authors":"Xianling Liang, Di Yang, R. Jin, Jun-ping Geng","doi":"10.1109/IWAT.2012.6178414","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178414","url":null,"abstract":"A wideband strip-line-fed dielectric resonator antenna is proposed for the 60-GHz UWB communication. The antenna achieves an bandwidth of ~15%, which is sufficient to covering the 60-GHz band, and provides a stable inclined radiation pattern, with a gain of 7.1±0.3 dBi over the entire operating bandwidth. Moreover, this antenna owns a simple structure and easy to integrate with MMICs. It is very suitable for the portable device applications.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87988304","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 : 2012-03-05DOI: 10.1109/IWAT.2012.6178681
Yong-xin Guo
In this paper, our research progress on millimeter-wave on-chip antennas and antennas in package will be reported. Firstly, wideband 60-GHz on-chip antennas with artificial magnetic conductors (AMC) on a standard 0.18um CMOS process will be presented. With the introduction of AMC, more freedom is added to optimize the antenna performance. The AMC plane can make the reflected wave in phase with the incident wave, therefore increase the gain performance. After that, we will also present a 60-GHz planar helical antenna using the LTCC technology. The antenna element is composed of eight 1/3-turn open loops at various layers connected by via holes to form an axial-mode helical structure to generate traveling wave radiation.
{"title":"Millimeter-wave on-chip antennas and antennas in package","authors":"Yong-xin Guo","doi":"10.1109/IWAT.2012.6178681","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178681","url":null,"abstract":"In this paper, our research progress on millimeter-wave on-chip antennas and antennas in package will be reported. Firstly, wideband 60-GHz on-chip antennas with artificial magnetic conductors (AMC) on a standard 0.18um CMOS process will be presented. With the introduction of AMC, more freedom is added to optimize the antenna performance. The AMC plane can make the reflected wave in phase with the incident wave, therefore increase the gain performance. After that, we will also present a 60-GHz planar helical antenna using the LTCC technology. The antenna element is composed of eight 1/3-turn open loops at various layers connected by via holes to form an axial-mode helical structure to generate traveling wave radiation.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87726599","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 : 2012-03-05DOI: 10.1109/IWAT.2012.6178652
S. Komeylian, F. Hojjat-kashani
In this paper, we investigate the frequency response and materials composition of a crossed-dipole FSS (Frequency Selective Surface). Moment methods in spectral domain, are employed to gain reflection coefficients of crossed-dipole FSS for both polarizations, providing valid analysis, especially in practice. The appropriate properties of crossed-dipole shape, in both its fabrication and its analysis, lead to various and sundry applications in antenna reflectors and other communication's vehicles. Besides, the effect of interaction between FSS structure and harsh environment would be investigated by considering its materials combination. The phase and amplitude frequency response for both polarizations have been illustrated at wide band frequency through the computer simulation.
{"title":"Intense scrutiny in cross-dipole Frequency Selective Surface","authors":"S. Komeylian, F. Hojjat-kashani","doi":"10.1109/IWAT.2012.6178652","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178652","url":null,"abstract":"In this paper, we investigate the frequency response and materials composition of a crossed-dipole FSS (Frequency Selective Surface). Moment methods in spectral domain, are employed to gain reflection coefficients of crossed-dipole FSS for both polarizations, providing valid analysis, especially in practice. The appropriate properties of crossed-dipole shape, in both its fabrication and its analysis, lead to various and sundry applications in antenna reflectors and other communication's vehicles. Besides, the effect of interaction between FSS structure and harsh environment would be investigated by considering its materials combination. The phase and amplitude frequency response for both polarizations have been illustrated at wide band frequency through the computer simulation.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83162188","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 : 2012-03-05DOI: 10.1109/IWAT.2012.6178403
Jie Lu, Zhenqi Kuai, Xiaowei Zhu
A broadband suspended patch antenna fed by co-planar double L-probes is proposed in this paper. Unlike a conventional L-probe fed patch antenna, the co-planar double L-probe is composed of two identical L-shaped strips which are printed entirely on a substrate and placed symmetrically below the patch. Hence, this kind of L-probe is more flexible to design and convenient to fabricate than a conventional one. A broadband 180° power divider is used to feed the double L-probes, which maintains the currents induced on the patch in phase and improves the symmetry of the current distribution. Because of this, the symmetry of the E-plane in radiation patterns and the H-plane cross polarization property can be improved.
{"title":"Broadband suspended patch antenna fed by co-planar double L-probes","authors":"Jie Lu, Zhenqi Kuai, Xiaowei Zhu","doi":"10.1109/IWAT.2012.6178403","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178403","url":null,"abstract":"A broadband suspended patch antenna fed by co-planar double L-probes is proposed in this paper. Unlike a conventional L-probe fed patch antenna, the co-planar double L-probe is composed of two identical L-shaped strips which are printed entirely on a substrate and placed symmetrically below the patch. Hence, this kind of L-probe is more flexible to design and convenient to fabricate than a conventional one. A broadband 180° power divider is used to feed the double L-probes, which maintains the currents induced on the patch in phase and improves the symmetry of the current distribution. Because of this, the symmetry of the E-plane in radiation patterns and the H-plane cross polarization property can be improved.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82126017","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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