In this study, a novel single layer band stop Frequency Selective Surface (FSS) for gain enhancement of Ultra-Wide Band (UWB) antenna is presented. The proposed FSS unit cell consists of a conventional square loop (CSL), a ring and cross dipole elements and printed on a single side of 15mm χ 15mm dielectric substrate. The −10dB frequency band relies on 3.02GHz and 11.79GHz and fractional bandwidth is %128. Also, effects of the unit cell parameters over the transmission performances are investigated and conclusions are presented. In order to showgain enhancement performance, the FSS with the designed high gain UWB antenna were simulated by CST MWS. The antenna with FSS has a maximum gain of 14dB. The FSS shows a linear reflection phase variation within the operation range and can be good candidate for enhancing the printed antennas gain.
本文提出了一种用于超宽带天线增益增强的新型单层带阻频率选择表面。所提出的FSS单元电池由传统的方环(CSL)，环和交叉偶极子元件组成，并印刷在15mm x 15mm介电衬底的单面上。−10dB频段依赖于3.02GHz和11.79GHz，分数带宽为%128。此外，还研究了单胞参数对传输性能的影响，并给出了结论。为了显示增益增强性能，利用CST MWS对设计的高增益超宽带天线的FSS进行了仿真。带FSS的天线最大增益为14dB。FSS在工作范围内呈现线性反射相位变化，是提高印刷天线增益的良好选择。
{"title":"A novel single layer frequency selective surface design for ultra-wide band antenna gain enhancement","authors":"A. Kocakaya, G. Çakir, C. Dikmen","doi":"10.5072/ZENODO.58360","DOIUrl":"https://doi.org/10.5072/ZENODO.58360","url":null,"abstract":"In this study, a novel single layer band stop Frequency Selective Surface (FSS) for gain enhancement of Ultra-Wide Band (UWB) antenna is presented. The proposed FSS unit cell consists of a conventional square loop (CSL), a ring and cross dipole elements and printed on a single side of 15mm χ 15mm dielectric substrate. The −10dB frequency band relies on 3.02GHz and 11.79GHz and fractional bandwidth is %128. Also, effects of the unit cell parameters over the transmission performances are investigated and conclusions are presented. In order to showgain enhancement performance, the FSS with the designed high gain UWB antenna were simulated by CST MWS. The antenna with FSS has a maximum gain of 14dB. The FSS shows a linear reflection phase variation within the operation range and can be good candidate for enhancing the printed antennas gain.","PeriodicalId":395108,"journal":{"name":"2017 10th International Conference on Electrical and Electronics Engineering (ELECO)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129442412","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}
In this study, effects of the different end shapes on the gain flatness of an Antipodal Vivaldi Antenna (APVA) operating over 3.1–10.6 GHz are investigated. The antenna having an ending with parallel wires is proposed for gain flatness in this study. Numerical studies are performed for four different APVAs having endings in different shapes of elliptical, circular and partially square forms and parallel wires. The best gain flatness is obtained for the antenna having the ending of the parallel wires.
{"title":"Effect of the different end shapes on the gain flatness of the Antipodal Vivaldi Antenna","authors":"Öznur Türkmen-Küçüksar, S. Cimen, G. Çakir","doi":"10.5072/ZENODO.54016","DOIUrl":"https://doi.org/10.5072/ZENODO.54016","url":null,"abstract":"In this study, effects of the different end shapes on the gain flatness of an Antipodal Vivaldi Antenna (APVA) operating over 3.1–10.6 GHz are investigated. The antenna having an ending with parallel wires is proposed for gain flatness in this study. Numerical studies are performed for four different APVAs having endings in different shapes of elliptical, circular and partially square forms and parallel wires. The best gain flatness is obtained for the antenna having the ending of the parallel wires.","PeriodicalId":395108,"journal":{"name":"2017 10th International Conference on Electrical and Electronics Engineering (ELECO)","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123175613","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}
This paper provides an in-depth investigation and analysis on the characteristics of channel-based transform waveforms and their differences from Fourier transform-based waveforms. Particularly, the basis functions of the recently proposed orthogonal transform division multiplexing (OTDM) waveform, which belongs to the category of channel-based transform waveforms, are comprehensively compared with the fixed exponential basis functions of orthogonal frequency division multiplexing (OFDM) waveform, which pertains to the class of Fourier transform-based waveforms. The obtained results show significant differences in the time and frequency characteristics of both classes of the waveforms. Also, the peak-to-average power ratio (PAPR) of OTDM is investigated and compared to OFDM. Then, a new effective technique, referred to as OTDM with edge subcarrier dedication (OTDM-ESD), is proposed for PAPR reduction by exploiting the special characteristics of the effective channel response in OTDM waveform. Simulation results show that the proposed OTDM-ESD technique not only reduces the PAPR, but also enhances the BER performance significantly.
{"title":"Time-frequency characteristics and PAPR reduction of OTDM waveform for 5G and beyond","authors":"Jehad M. Hamamreh, H. Arslan","doi":"10.5072/ZENODO.54808","DOIUrl":"https://doi.org/10.5072/ZENODO.54808","url":null,"abstract":"This paper provides an in-depth investigation and analysis on the characteristics of channel-based transform waveforms and their differences from Fourier transform-based waveforms. Particularly, the basis functions of the recently proposed orthogonal transform division multiplexing (OTDM) waveform, which belongs to the category of channel-based transform waveforms, are comprehensively compared with the fixed exponential basis functions of orthogonal frequency division multiplexing (OFDM) waveform, which pertains to the class of Fourier transform-based waveforms. The obtained results show significant differences in the time and frequency characteristics of both classes of the waveforms. Also, the peak-to-average power ratio (PAPR) of OTDM is investigated and compared to OFDM. Then, a new effective technique, referred to as OTDM with edge subcarrier dedication (OTDM-ESD), is proposed for PAPR reduction by exploiting the special characteristics of the effective channel response in OTDM waveform. Simulation results show that the proposed OTDM-ESD technique not only reduces the PAPR, but also enhances the BER performance significantly.","PeriodicalId":395108,"journal":{"name":"2017 10th International Conference on Electrical and Electronics Engineering (ELECO)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133896779","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}
A millimeter wave obstacle detection system for helicopters is installed to observe the feasibility for the detection of power lines from a safe distance, using 77 and 94 GHz central frequencies, separately. A two wire power line system is illuminated using two different antennas with 24 and 27 dBi gains, comparatively. An external W band (92–96 GHz) power amplifier is also used to measure power line response for increasing the maximum detection distance. It's shown that the use of 77 GHz central frequency, as well as higher antenna gain and output power, is better in terms of increasing the detection range of the millimeter wave radar system. The feasibility measurements are also validated using the theoretical radar formula. A collision avoidance and warning system to detect power lines is also discussed using a compact millimeter wave radar module for the future study.
{"title":"Investigations on millimeter wave detection of power lines from a safe distance","authors":"Ilhami Ünal, S. Eker","doi":"10.5072/ZENODO.14154","DOIUrl":"https://doi.org/10.5072/ZENODO.14154","url":null,"abstract":"A millimeter wave obstacle detection system for helicopters is installed to observe the feasibility for the detection of power lines from a safe distance, using 77 and 94 GHz central frequencies, separately. A two wire power line system is illuminated using two different antennas with 24 and 27 dBi gains, comparatively. An external W band (92–96 GHz) power amplifier is also used to measure power line response for increasing the maximum detection distance. It's shown that the use of 77 GHz central frequency, as well as higher antenna gain and output power, is better in terms of increasing the detection range of the millimeter wave radar system. The feasibility measurements are also validated using the theoretical radar formula. A collision avoidance and warning system to detect power lines is also discussed using a compact millimeter wave radar module for the future study.","PeriodicalId":395108,"journal":{"name":"2017 10th International Conference on Electrical and Electronics Engineering (ELECO)","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126303178","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}
We consider microwave imaging of pulmonary edema which is a critical medical condition which manifests itself as a water accumulation in the human lungs. In order to detect water accumulation in the human lungs, we implement a microwave inversion scheme based on Born iterative method (BIM). To that end, a realistic human torso phantom is used and dielectric parameters of tissues and organs are estimated via Cole-Cole model at desired frequency. Then, scattered electric field is calculated synthetically by method of moments. Simulations are performed at 350 MHz and the region between phantom and antennas are surrounded by a dielectric material with a permittivity of 30. In the numerical results section, performance assessment of BIM is carried for two cases. The numerical results suggest that the BIM is capable of imaging water accumulation in the human lungs.
{"title":"Imaging of pulmonary edema with microwaves — Preliminary investigation","authors":"Semih Doğu, Ismail Dilman, M. Çayören, I. Akduman","doi":"10.5072/ZENODO.56042","DOIUrl":"https://doi.org/10.5072/ZENODO.56042","url":null,"abstract":"We consider microwave imaging of pulmonary edema which is a critical medical condition which manifests itself as a water accumulation in the human lungs. In order to detect water accumulation in the human lungs, we implement a microwave inversion scheme based on Born iterative method (BIM). To that end, a realistic human torso phantom is used and dielectric parameters of tissues and organs are estimated via Cole-Cole model at desired frequency. Then, scattered electric field is calculated synthetically by method of moments. Simulations are performed at 350 MHz and the region between phantom and antennas are surrounded by a dielectric material with a permittivity of 30. In the numerical results section, performance assessment of BIM is carried for two cases. The numerical results suggest that the BIM is capable of imaging water accumulation in the human lungs.","PeriodicalId":395108,"journal":{"name":"2017 10th International Conference on Electrical and Electronics Engineering (ELECO)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114318239","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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