Pub Date : 2012-10-08DOI: 10.1109/APWC.2012.6324946
P. G. Wiid, K. D. Palmer, P. S. van der Merwe, H. Reader
Design details of a 50:1 bandwidth printed circuit board log periodic dipole array antenna for practical radio frequency interference measurement use are discussed. A feeding tab design optimization is incorporated, which obviates the need for a dummy cable on the opposite board to balance the feed cable structure. Computer simulated and measured realized gain and reflection coefficient results are shown from 50 MHz to 8 GHz. Although the antenna works well over its intended bandwidth of 150 MHz to 7.5 GHz, it can be used down to 70 MHz.
{"title":"A practical 50∶1 bandwidth PCB-LPDA antenna for MeerKAT RFI studies","authors":"P. G. Wiid, K. D. Palmer, P. S. van der Merwe, H. Reader","doi":"10.1109/APWC.2012.6324946","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324946","url":null,"abstract":"Design details of a 50:1 bandwidth printed circuit board log periodic dipole array antenna for practical radio frequency interference measurement use are discussed. A feeding tab design optimization is incorporated, which obviates the need for a dummy cable on the opposite board to balance the feed cable structure. Computer simulated and measured realized gain and reflection coefficient results are shown from 50 MHz to 8 GHz. Although the antenna works well over its intended bandwidth of 150 MHz to 7.5 GHz, it can be used down to 70 MHz.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89376892","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324911
O. Rorato, S. Bertoldo, C. Lucianaz, M. Allegretti, G. Perona
In recent years Wireless Sensor Networks (WSNs) have attracted an increasing attention because of the large number of potential applications. They are used for collecting, storing and sharing data, for monitoring application, surveillance purposes and much more. Taking into account such multipurpose applications, a new experimental electronic board has been designed to be used specifically as a multipurpose WSN node. The board has been completely designed as an open system in order to be configured by only varying the firmware on the microcontroller to be connected with different types of sensors, such as, for example, solid state tri-axial accelerometer, analog temperature sensors, GNSS receivers, etc... The board allow different interfaces and is equipped with a recovery system via a watchdog chip which continuously monitor the onboard microcontroller. A free open source operative system has been ported on the microcontroller in order to give greater flexibility to the node, and to perform multi tasking operations. Low power consumptions together with its compact size, and its multiple functionalities made the board perfectly suited as a multipurpose WSN node. The boards have been already employed in two installed WSN: a GPS monitoring network and an WSN designed as anti-theft alarm system for photovoltaic panels.
{"title":"A multipurpose node for low cost wireless sensor network","authors":"O. Rorato, S. Bertoldo, C. Lucianaz, M. Allegretti, G. Perona","doi":"10.1109/APWC.2012.6324911","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324911","url":null,"abstract":"In recent years Wireless Sensor Networks (WSNs) have attracted an increasing attention because of the large number of potential applications. They are used for collecting, storing and sharing data, for monitoring application, surveillance purposes and much more. Taking into account such multipurpose applications, a new experimental electronic board has been designed to be used specifically as a multipurpose WSN node. The board has been completely designed as an open system in order to be configured by only varying the firmware on the microcontroller to be connected with different types of sensors, such as, for example, solid state tri-axial accelerometer, analog temperature sensors, GNSS receivers, etc... The board allow different interfaces and is equipped with a recovery system via a watchdog chip which continuously monitor the onboard microcontroller. A free open source operative system has been ported on the microcontroller in order to give greater flexibility to the node, and to perform multi tasking operations. Low power consumptions together with its compact size, and its multiple functionalities made the board perfectly suited as a multipurpose WSN node. The boards have been already employed in two installed WSN: a GPS monitoring network and an WSN designed as anti-theft alarm system for photovoltaic panels.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87084077","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324960
W. Steyn
This paper presents a procedure for the design of edge-slot non-resonant planar waveguide arrays for marine applications with relative bandwidths of up to 13 percent.
本文提出了一种相对带宽高达13%的船用边槽非谐振平面波导阵列的设计方法。
{"title":"Planar slotted waveguide arrays for marine applications","authors":"W. Steyn","doi":"10.1109/APWC.2012.6324960","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324960","url":null,"abstract":"This paper presents a procedure for the design of edge-slot non-resonant planar waveguide arrays for marine applications with relative bandwidths of up to 13 percent.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74845641","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324920
M. Hein, M. Helbig, M. Kmec, J. Sachs, F. Scotto di Clemente, R. Stephan, M. Hamouda, T. Ussmueller, R. Weigel, M. Robens, R. Wunderlich, S. Heinen
Ultra-wideband active array imaging has proven extremely valuable for biomedical diagnostics. At the same time, the underlying technologies have achieved a high degree of maturity. Across institutions, we have merged our expertise in M-sequence radar systems, antennas, low-noise and high-power circuitry, to devise an UWB MIMO radar system for breast tumour localisation. Recent progress in UWB imaging and hardware for active antenna arrays is presented.
{"title":"Ultra-wideband active array imaging for biomedical diagnostics","authors":"M. Hein, M. Helbig, M. Kmec, J. Sachs, F. Scotto di Clemente, R. Stephan, M. Hamouda, T. Ussmueller, R. Weigel, M. Robens, R. Wunderlich, S. Heinen","doi":"10.1109/APWC.2012.6324920","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324920","url":null,"abstract":"Ultra-wideband active array imaging has proven extremely valuable for biomedical diagnostics. At the same time, the underlying technologies have achieved a high degree of maturity. Across institutions, we have merged our expertise in M-sequence radar systems, antennas, low-noise and high-power circuitry, to devise an UWB MIMO radar system for breast tumour localisation. Recent progress in UWB imaging and hardware for active antenna arrays is presented.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83312038","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324948
I. Mason, J. Cloete, K. D. Palmer
Hitherto, Tx→Rx cross-talk has inhibited the profiling of shorter tactical probe-holes, drilled from stopes at shallow angles below reef. Now that recent component advances have shrunk bistatic radars, raising their close-in response without compromising long range performance, BHR designers are moving towards mapping face & hanging wall fractures in stope automatically at one hundredth the scale of reconnaissance, in part with proximity coupled blast & bolt drillrod guided radars.
{"title":"Borehole radar imaging in tactical support of miners working in very narrow stopes","authors":"I. Mason, J. Cloete, K. D. Palmer","doi":"10.1109/APWC.2012.6324948","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324948","url":null,"abstract":"Hitherto, Tx→Rx cross-talk has inhibited the profiling of shorter tactical probe-holes, drilled from stopes at shallow angles below reef. Now that recent component advances have shrunk bistatic radars, raising their close-in response without compromising long range performance, BHR designers are moving towards mapping face & hanging wall fractures in stope automatically at one hundredth the scale of reconnaissance, in part with proximity coupled blast & bolt drillrod guided radars.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76150195","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324967
Jinbao Zhang, Y. Wen, Kesheng Zhou, Z. Tan, Yun Zhu
This work proposes an explicit relationship between APD statistical parameters of EMI and the performance of digital radio systems, and then finds the algorithms for evaluating BER by using APD of interference. Finally, a feasible scheme of ensuring the limits of APD which meet the BER requirements of baseband modulation radio systems is presented.
{"title":"Research on statistical parameters of interference for digital radio","authors":"Jinbao Zhang, Y. Wen, Kesheng Zhou, Z. Tan, Yun Zhu","doi":"10.1109/APWC.2012.6324967","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324967","url":null,"abstract":"This work proposes an explicit relationship between APD statistical parameters of EMI and the performance of digital radio systems, and then finds the algorithms for evaluating BER by using APD of interference. Finally, a feasible scheme of ensuring the limits of APD which meet the BER requirements of baseband modulation radio systems is presented.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81117462","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324981
J. B. du Toit, D. Baker, A. J. Booysen
This paper presents design considerations and measured results for a two element 8 to 12 GHz horn antenna array for transmit/receive applications requiring high isolation. Circular polarization is achieved by incorporating a five layer meanderline circular polarizer over the aperture of the horn antenna. The measured axial ratio for operational antennas including protective radomes is less than 0.85 dB over the entire frequency band. The antennas are fitted with waveguide-to-coax adapters and achieve a VSWR ≤ 1.5:1 in the fully assembled condition. Installed isolation of better than 78 dB is achieved over most of the frequency band at a prescribed antenna separation of 500 mm.
{"title":"Design and development of an 8 to 12 GHz circularly polarized two element horn antenna array with high isolation","authors":"J. B. du Toit, D. Baker, A. J. Booysen","doi":"10.1109/APWC.2012.6324981","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324981","url":null,"abstract":"This paper presents design considerations and measured results for a two element 8 to 12 GHz horn antenna array for transmit/receive applications requiring high isolation. Circular polarization is achieved by incorporating a five layer meanderline circular polarizer over the aperture of the horn antenna. The measured axial ratio for operational antennas including protective radomes is less than 0.85 dB over the entire frequency band. The antennas are fitted with waveguide-to-coax adapters and achieve a VSWR ≤ 1.5:1 in the fully assembled condition. Installed isolation of better than 78 dB is achieved over most of the frequency band at a prescribed antenna separation of 500 mm.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82606985","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324955
O. Quevedo–Teruel, Y. Hao
Surface Plasmons and particularly Domino Plasmons have demonstrated to present ideal conditions for THz waveguides. However radiators for this technology had not enough attention in the literature. In this paper we propose the use of dense dielectric substrates to obtain a leaky wave antenna with broadband and constant radiation properties. In order to provide preliminary results of the potential of our proposal a design in the microwave regime has been studied with very promising properties, i.e. very low Side Lobe Level (SLL) of -15dB and low cross-polarization (-30dB in all the directions and negligible in the main plane).
{"title":"On the use of surface plasmons for the design of WB leaky ave antennas","authors":"O. Quevedo–Teruel, Y. Hao","doi":"10.1109/APWC.2012.6324955","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324955","url":null,"abstract":"Surface Plasmons and particularly Domino Plasmons have demonstrated to present ideal conditions for THz waveguides. However radiators for this technology had not enough attention in the literature. In this paper we propose the use of dense dielectric substrates to obtain a leaky wave antenna with broadband and constant radiation properties. In order to provide preliminary results of the potential of our proposal a design in the microwave regime has been studied with very promising properties, i.e. very low Side Lobe Level (SLL) of -15dB and low cross-polarization (-30dB in all the directions and negligible in the main plane).","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78298145","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324963
Y. Wen, Yunshuang Ma, Xiaoyan Zhang, Xiaojun Jin, Fenglan Wang
In this paper, based on the measured data at Wuhan-Guangzhou high speed railway, the statistics characteristics of high speed mobile fading channel including long-term and short-term fading in this environment are presented. The measurement campaigns were conducted at GSM-R downlink band. The experimental data was analyzed to provide path loss model and short-term fading statistics including probability density functions (PDF) of signal amplitude, delay statistics, number of paths and path power statistics. From these statistics, it is shown that the path loss index at this railway area is n=2~5 with standard deviation ranging from 3 to 6dB; the test PDF of the short-term fading in such channels approximately fit Nakagami distributions better; the cumulative density functions of average delay and root mean square delay demonstrated that the mean and root mean square delay are not larger than respectively 1.37μs and 1.69μs and maximum delays less than 6.7μs occur most frequently. At last, the PDFs of paths and PDFs of relative amplitude of paths with different threshold levels were computed and drawn.
{"title":"Channel fading statistics in high-speed mobile environment","authors":"Y. Wen, Yunshuang Ma, Xiaoyan Zhang, Xiaojun Jin, Fenglan Wang","doi":"10.1109/APWC.2012.6324963","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324963","url":null,"abstract":"In this paper, based on the measured data at Wuhan-Guangzhou high speed railway, the statistics characteristics of high speed mobile fading channel including long-term and short-term fading in this environment are presented. The measurement campaigns were conducted at GSM-R downlink band. The experimental data was analyzed to provide path loss model and short-term fading statistics including probability density functions (PDF) of signal amplitude, delay statistics, number of paths and path power statistics. From these statistics, it is shown that the path loss index at this railway area is n=2~5 with standard deviation ranging from 3 to 6dB; the test PDF of the short-term fading in such channels approximately fit Nakagami distributions better; the cumulative density functions of average delay and root mean square delay demonstrated that the mean and root mean square delay are not larger than respectively 1.37μs and 1.69μs and maximum delays less than 6.7μs occur most frequently. At last, the PDFs of paths and PDFs of relative amplitude of paths with different threshold levels were computed and drawn.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90085680","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 : 2012-10-08DOI: 10.1109/APWC.2012.6324930
P. H. van der Merwe, J. Odendaal, J. Joubert
A compact quad-ridged horn antenna is presented. This antenna was designed by separating the antenna into the co-axial to ridged waveguide transition and the flared horn sections. The two sections were simulated and optimized separately and afterwards combined to form a complete unit. It is shown that the complete antenna's performance is a combination of the performance of the two sections. The antenna is dual-polarized and a return loss that is greater than 10dB is achieved across a 15.7:1 bandwidth.
{"title":"A dual-polarized ridged horn antenna","authors":"P. H. van der Merwe, J. Odendaal, J. Joubert","doi":"10.1109/APWC.2012.6324930","DOIUrl":"https://doi.org/10.1109/APWC.2012.6324930","url":null,"abstract":"A compact quad-ridged horn antenna is presented. This antenna was designed by separating the antenna into the co-axial to ridged waveguide transition and the flared horn sections. The two sections were simulated and optimized separately and afterwards combined to form a complete unit. It is shown that the complete antenna's performance is a combination of the performance of the two sections. The antenna is dual-polarized and a return loss that is greater than 10dB is achieved across a 15.7:1 bandwidth.","PeriodicalId":6393,"journal":{"name":"2012 IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2012-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83853199","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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