Pub Date : 2007-06-09DOI: 10.1109/APS.2007.4395971
E. Ofli, F. Nunez, N. Chavannes, E. Cherubini, N. Kuster
This paper present a novel approach which allows to perform - to our knowledge for the first time - the effective optimization of entire CAD derived devices, embedded in complex environments. The new optimizer combines the advantages of genetic algorithms with the unique and superior speed of FDTD hardware acceleration. On the basis of a commercial mobile phone, the applied methods are outlined and demonstrated whereas the devices' antenna is optimized with respect to return loss/matching in free space and under real usage conditions, i.e., with head and hand. In addition, our optimization technique runs a sensitivity study for each optimized parameter in parallel.
{"title":"Design and optimization of CAD derived mobile phone antennas using multi-goal genetic algorithms","authors":"E. Ofli, F. Nunez, N. Chavannes, E. Cherubini, N. Kuster","doi":"10.1109/APS.2007.4395971","DOIUrl":"https://doi.org/10.1109/APS.2007.4395971","url":null,"abstract":"This paper present a novel approach which allows to perform - to our knowledge for the first time - the effective optimization of entire CAD derived devices, embedded in complex environments. The new optimizer combines the advantages of genetic algorithms with the unique and superior speed of FDTD hardware acceleration. On the basis of a commercial mobile phone, the applied methods are outlined and demonstrated whereas the devices' antenna is optimized with respect to return loss/matching in free space and under real usage conditions, i.e., with head and hand. In addition, our optimization technique runs a sensitivity study for each optimized parameter in parallel.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124797170","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 : 2007-06-09DOI: 10.1109/APS.2007.4395901
S. Farzaneh, A. Sebak
Using microwave beamforming (MBF) reduces the cost, size, weight and battery power consumption of the adaptive beamformer structure by lowering the number of RF down-converters and analog to digital converters (ADC). However, there have been two problems associated with traditional MBF. One problem is having only one signal at the output that limits the signal processing capability of the structure. Several perturbation-based algorithms have been proposed for this purpose. Another problem the need for multiple phase shifters and amplitude control circuits which are the most expensive part of these systems. In (Farzaneh and Sebak, 2006), a new MBF structure has been proposed which independently accomplishes full range phase-amplitude control using one simple block by sampling in the microwave domain. This technique reduces the implementation cost of the MBF and also makes it possible to obtain high resolution weightings using high resolution time delay and pulse width modulation ICs. However, the structure in (Farzaneh and Sebak, 2006) is based on an infinite periodic pulse train. For adaptive beamforming (ABF) and direction of arrival (DOA) estimation, where weights are updated temporarily, the sampling pulse train is finite. In this work, the effect of the finite duration pulse train is investigated. A new limit for the sampling frequency is obtained which is a function of signal bandwidth and pulse train duration. In the next section the fundamental principle of the MSBF is introduced and the new structure is discussed. Then, simulation model and results are presented. Finally, summary and conclusions are given.
{"title":"Microwave sampling beamformer with finite pulse train","authors":"S. Farzaneh, A. Sebak","doi":"10.1109/APS.2007.4395901","DOIUrl":"https://doi.org/10.1109/APS.2007.4395901","url":null,"abstract":"Using microwave beamforming (MBF) reduces the cost, size, weight and battery power consumption of the adaptive beamformer structure by lowering the number of RF down-converters and analog to digital converters (ADC). However, there have been two problems associated with traditional MBF. One problem is having only one signal at the output that limits the signal processing capability of the structure. Several perturbation-based algorithms have been proposed for this purpose. Another problem the need for multiple phase shifters and amplitude control circuits which are the most expensive part of these systems. In (Farzaneh and Sebak, 2006), a new MBF structure has been proposed which independently accomplishes full range phase-amplitude control using one simple block by sampling in the microwave domain. This technique reduces the implementation cost of the MBF and also makes it possible to obtain high resolution weightings using high resolution time delay and pulse width modulation ICs. However, the structure in (Farzaneh and Sebak, 2006) is based on an infinite periodic pulse train. For adaptive beamforming (ABF) and direction of arrival (DOA) estimation, where weights are updated temporarily, the sampling pulse train is finite. In this work, the effect of the finite duration pulse train is investigated. A new limit for the sampling frequency is obtained which is a function of signal bandwidth and pulse train duration. In the next section the fundamental principle of the MSBF is introduced and the new structure is discussed. Then, simulation model and results are presented. Finally, summary and conclusions are given.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126175831","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 : 2007-06-09DOI: 10.1109/APS.2007.4395698
Jie Yang, Pinyuen Chen, Tiee-Jian Wu
In this paper we apply model selection criteria in time series and regression analysis to the estimation of the number of signals in the MUSIC (multiple signal classification) method. We compare the following model selection (information) criteria: AIC, HQ, BIC, AICC, and the recently introduced WIC as the weighted average of AICC and BIC. The general form of the above information criteria consists of a log likelihood function expressed in terms of the eigenvalues of the covariance matrix and a unique penalty term. In our estimation procedure, the number of signals is obtained by minimizing each of the above criteria. A linear antenna array example is presented to compare the performance of the above model selection criteria in signal processing problem.
{"title":"On estimating the number of signals","authors":"Jie Yang, Pinyuen Chen, Tiee-Jian Wu","doi":"10.1109/APS.2007.4395698","DOIUrl":"https://doi.org/10.1109/APS.2007.4395698","url":null,"abstract":"In this paper we apply model selection criteria in time series and regression analysis to the estimation of the number of signals in the MUSIC (multiple signal classification) method. We compare the following model selection (information) criteria: AIC, HQ, BIC, AICC, and the recently introduced WIC as the weighted average of AICC and BIC. The general form of the above information criteria consists of a log likelihood function expressed in terms of the eigenvalues of the covariance matrix and a unique penalty term. In our estimation procedure, the number of signals is obtained by minimizing each of the above criteria. A linear antenna array example is presented to compare the performance of the above model selection criteria in signal processing problem.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123553079","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 : 2007-06-09DOI: 10.1109/APS.2007.4395452
E. de Lera, E. García
In order to obtain the full performance of a finite phased-array antenna, due to the presence of edge and inner elements, a high computational cost full wave simulation of the whole array is necessary. In the case of an array where SmnneSnm (an active array for instance), the coupling characteristics of any element must be computed by means of feeding every element in the simulation and sometimes this cost may be unaffordable. In this paper, we develop an approximated method to get the active reflection coefficient (ARC), of an edge element using the ARC of an element embedded in an infinite array, which implies a reduction in the computational load of the calculation.
{"title":"Mutual coupling edge effect approximation for phased-array antennas","authors":"E. de Lera, E. García","doi":"10.1109/APS.2007.4395452","DOIUrl":"https://doi.org/10.1109/APS.2007.4395452","url":null,"abstract":"In order to obtain the full performance of a finite phased-array antenna, due to the presence of edge and inner elements, a high computational cost full wave simulation of the whole array is necessary. In the case of an array where SmnneSnm (an active array for instance), the coupling characteristics of any element must be computed by means of feeding every element in the simulation and sometimes this cost may be unaffordable. In this paper, we develop an approximated method to get the active reflection coefficient (ARC), of an edge element using the ARC of an element embedded in an infinite array, which implies a reduction in the computational load of the calculation.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123783277","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 : 2007-06-09DOI: 10.1109/APS.2007.4395662
B. Li, K. Leung, Y. C. Or
In this paper, a dualband antenna that consists of two radiating slots is studied. The slots are cut onto an L-probe-fed hollow rectangular conducting cavity, which is covered by a protective dielectric layer. Dualband operation can be obtained by exciting the two resonant modes of the two slots. It is found that the frequencies of the two resonant modes can be adjusted independently, which greatly facilitates the antenna design. To demonstrate the idea, a dualband antenna for 2.4/5.2-GHz IEEE802.11a/b WLAN applications is designed. The return loss,radiation pattern, gain the antenna are studied. Reasonable agreement between simulation and experiment is obtained.
{"title":"Dualband dielectric-covered slot antenna","authors":"B. Li, K. Leung, Y. C. Or","doi":"10.1109/APS.2007.4395662","DOIUrl":"https://doi.org/10.1109/APS.2007.4395662","url":null,"abstract":"In this paper, a dualband antenna that consists of two radiating slots is studied. The slots are cut onto an L-probe-fed hollow rectangular conducting cavity, which is covered by a protective dielectric layer. Dualband operation can be obtained by exciting the two resonant modes of the two slots. It is found that the frequencies of the two resonant modes can be adjusted independently, which greatly facilitates the antenna design. To demonstrate the idea, a dualband antenna for 2.4/5.2-GHz IEEE802.11a/b WLAN applications is designed. The return loss,radiation pattern, gain the antenna are studied. Reasonable agreement between simulation and experiment is obtained.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125294513","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 : 2007-06-09DOI: 10.1109/APS.2007.4395941
Kiburm Ahn, M. Uhm, I. Yom
This paper presents a new circular-shaped dual-mode cavity for mm wave filters in the LTCC substrate. The cavity enables a resonator filter to include the cross couplings between input and output ports for high frequency selectivity. Two mm-wave filters are demonstrated to verify the effectiveness of proposed cavity.
{"title":"New circular-shaped dual-mode cavity for mm-wave filters using LTCC technology","authors":"Kiburm Ahn, M. Uhm, I. Yom","doi":"10.1109/APS.2007.4395941","DOIUrl":"https://doi.org/10.1109/APS.2007.4395941","url":null,"abstract":"This paper presents a new circular-shaped dual-mode cavity for mm wave filters in the LTCC substrate. The cavity enables a resonator filter to include the cross couplings between input and output ports for high frequency selectivity. Two mm-wave filters are demonstrated to verify the effectiveness of proposed cavity.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125340237","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 : 2007-06-09DOI: 10.1109/APS.2007.4396257
E. Palantei, D. Thiel
Radiation pattern symmetry of a switched parasitic smart antenna is important for full 360deg azimuthal coverage. The ideal symmetrical beam patterns are hard to achieve in reality due to a number of crucial problems related to the need for precision design and manufacture, and the accuracy of the supporting electronics. These factors are examined on this paper.
{"title":"Symmetry problems in switched parasitic smart antennas","authors":"E. Palantei, D. Thiel","doi":"10.1109/APS.2007.4396257","DOIUrl":"https://doi.org/10.1109/APS.2007.4396257","url":null,"abstract":"Radiation pattern symmetry of a switched parasitic smart antenna is important for full 360deg azimuthal coverage. The ideal symmetrical beam patterns are hard to achieve in reality due to a number of crucial problems related to the need for precision design and manufacture, and the accuracy of the supporting electronics. These factors are examined on this paper.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125351734","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 : 2007-06-09DOI: 10.1109/APS.2007.4395604
L. Lizzi, F. Viani, R. Azaro, P. Rocca, A. Massa
In this paper, an innovative spline-based approach for the UWB antennas synthesis has been proposed. The flexibility and accuracy of the method allows a reliable matching of UWB requirements. A representative design example described through the arising simulated as well as experimental electrical parameters has been presented in order to confirm the effectiveness of the approach.
{"title":"An innovative spline-based shaping approach for ultra-wideband antenna synthesis","authors":"L. Lizzi, F. Viani, R. Azaro, P. Rocca, A. Massa","doi":"10.1109/APS.2007.4395604","DOIUrl":"https://doi.org/10.1109/APS.2007.4395604","url":null,"abstract":"In this paper, an innovative spline-based approach for the UWB antennas synthesis has been proposed. The flexibility and accuracy of the method allows a reliable matching of UWB requirements. A representative design example described through the arising simulated as well as experimental electrical parameters has been presented in order to confirm the effectiveness of the approach.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125367360","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 : 2007-06-09DOI: 10.1109/APS.2007.4395857
Kihun Chang, Woosung Lee, Jaekwon Kim
A wireless identification system based on SAW devices is presented. To reduce degradation of the antenna performance associated with the piezoelectric materials with a good electro-mechanical coupling property, an efficient design of the transponder is required. By measuring parameters of the SAW ID tag, the performance was tested by experimentation.
{"title":"A wireless identification system with an efficient antenna based on passive SAW devices","authors":"Kihun Chang, Woosung Lee, Jaekwon Kim","doi":"10.1109/APS.2007.4395857","DOIUrl":"https://doi.org/10.1109/APS.2007.4395857","url":null,"abstract":"A wireless identification system based on SAW devices is presented. To reduce degradation of the antenna performance associated with the piezoelectric materials with a good electro-mechanical coupling property, an efficient design of the transponder is required. By measuring parameters of the SAW ID tag, the performance was tested by experimentation.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125528573","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 : 2007-06-09DOI: 10.1109/APS.2007.4396227
S. Burintramart, N. Yilmazer, T. Sarkar, M. Salazar-Palma
In this paper, another basic form of Shannon channel capacity, which may be more appropriate for vector quantities, is discussed. We start with the Shannon channel capacity theorem followed by numerical simulations. Then the other possible form of channel capacity will be discussed. It is seen that the new metric is linear as opposed to the classical form, which is nonlinear.
{"title":"Different perspective on channel capacity theorem","authors":"S. Burintramart, N. Yilmazer, T. Sarkar, M. Salazar-Palma","doi":"10.1109/APS.2007.4396227","DOIUrl":"https://doi.org/10.1109/APS.2007.4396227","url":null,"abstract":"In this paper, another basic form of Shannon channel capacity, which may be more appropriate for vector quantities, is discussed. We start with the Shannon channel capacity theorem followed by numerical simulations. Then the other possible form of channel capacity will be discussed. It is seen that the new metric is linear as opposed to the classical form, which is nonlinear.","PeriodicalId":117975,"journal":{"name":"2007 IEEE Antennas and Propagation Society International Symposium","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126604931","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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