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":"147 1","pages":"104-107"},"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":"5 1","pages":"165-168"},"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":"87 1","pages":"261-264"},"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":"50 1","pages":"281-284"},"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.2012.6178415
H. Chattha, M. Ishfaq, Y. Huang, S. Boyes
The planar inverted-F antenna (PIFA) is widely used in mobile and portable radio systems due to its excellent features. However, it is not yet employed as an ultra wide band antenna because it was considered a narrowband antenna. This paper introduces an ultra wideband planar inverted-F antenna based on three techniques, which are (a) changes in the widths of feed and shorting plates, (b) addition of an inverted-L shaped parasitic element and (c) addition of a rectangular parasitic element. It is shown that ultra wideband PIFAs with fractional bandwidth of more than 100 % is achieved covering from 3.4 GHz to 10.7 GHz. Simulated and measured results are provided to verify the conclusion.
{"title":"An UWB planar inverted-F antenna for wireless applications","authors":"H. Chattha, M. Ishfaq, Y. Huang, S. Boyes","doi":"10.1109/IWAT.2012.6178415","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178415","url":null,"abstract":"The planar inverted-F antenna (PIFA) is widely used in mobile and portable radio systems due to its excellent features. However, it is not yet employed as an ultra wide band antenna because it was considered a narrowband antenna. This paper introduces an ultra wideband planar inverted-F antenna based on three techniques, which are (a) changes in the widths of feed and shorting plates, (b) addition of an inverted-L shaped parasitic element and (c) addition of a rectangular parasitic element. It is shown that ultra wideband PIFAs with fractional bandwidth of more than 100 % is achieved covering from 3.4 GHz to 10.7 GHz. Simulated and measured results are provided to verify the conclusion.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":"104 1","pages":"128-131"},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74442290","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.2012.6178680
T. Zwick, S. Beer
This paper introduces the idea of a low-cost surface-mountable millimeter-wave radar sensor. Different packaging topologies are compared with the potential of integrating the whole radar frontend together with the antennas into a single QFN package. The pros and cons of the different packaging concepts are discussed and finally, a 120 GHz off-chip antenna design for integration into a QFN package and its measurements are presented.
{"title":"QFN based packaging concepts for millimeter-wave transceivers","authors":"T. Zwick, S. Beer","doi":"10.1109/IWAT.2012.6178680","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178680","url":null,"abstract":"This paper introduces the idea of a low-cost surface-mountable millimeter-wave radar sensor. Different packaging topologies are compared with the potential of integrating the whole radar frontend together with the antennas into a single QFN package. The pros and cons of the different packaging concepts are discussed and finally, a 120 GHz off-chip antenna design for integration into a QFN package and its measurements are presented.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":"205 1","pages":"335-338"},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77043368","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":"1 1","pages":"221-224"},"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.2012.6178668
M. Barbuto, A. Monti, F. Bilotti, A. Toscano
In this contribution, we theoretically and numerically show that the operation bandwidth of an electrically small SRR loaded monopole antenna can be improved by using non-Foster active elements connected to the external gap of the SRR. The circuit implementation of the required non-Foster load in the VHF frequency band, as well as the stability analysis of the whole active component are also presented and discussed.
{"title":"Employment of non-Foster active loads to improve the operation bandwidth of SRR loaded monopole antennas","authors":"M. Barbuto, A. Monti, F. Bilotti, A. Toscano","doi":"10.1109/IWAT.2012.6178668","DOIUrl":"https://doi.org/10.1109/IWAT.2012.6178668","url":null,"abstract":"In this contribution, we theoretically and numerically show that the operation bandwidth of an electrically small SRR loaded monopole antenna can be improved by using non-Foster active elements connected to the external gap of the SRR. The circuit implementation of the required non-Foster load in the VHF frequency band, as well as the stability analysis of the whole active component are also presented and discussed.","PeriodicalId":6341,"journal":{"name":"2012 IEEE International Workshop on Antenna Technology (iWAT)","volume":"41 1","pages":"285-288"},"PeriodicalIF":0.0,"publicationDate":"2012-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90209303","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":"19 1","pages":"124-127"},"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.2012.6178671
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":"71 1","pages":"297-298"},"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}
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