Pub Date : 2016-03-14DOI: 10.1109/IEEE-IWS.2016.7585455
B. Gao, Linsheng Wu, J. Mao
A resistively coupled lossy filter is proposed using the substrate integrated waveguide (SIW) resonators, where nonresonating nodes are avoided for simple realization. Based on the sensitivity analysis of the resistive coupling coefficient, the parameters of coupling structure and mounted resistors are determined. In the measured results, the 0.2-dB passband is increased from 198 MHz of the case without resistive couplings to 256 MHz with resistive couplings. The flat passband and high selectivity are achieved at the cost of an additional insertion loss (IL) of 1.1 dB. Since SIW cavities can provide higher unloaded Q-factor than microstrip resonators, a smaller in-band IL deterioration will be required with the lossy SIW filter than microstrip counterparts when a good passband flatness is desired, especially for narrow-band applications. Excellent agreement is observed between the simulated and measured results.
{"title":"Lossy substrate integrated waveguide filter with flat passband","authors":"B. Gao, Linsheng Wu, J. Mao","doi":"10.1109/IEEE-IWS.2016.7585455","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2016.7585455","url":null,"abstract":"A resistively coupled lossy filter is proposed using the substrate integrated waveguide (SIW) resonators, where nonresonating nodes are avoided for simple realization. Based on the sensitivity analysis of the resistive coupling coefficient, the parameters of coupling structure and mounted resistors are determined. In the measured results, the 0.2-dB passband is increased from 198 MHz of the case without resistive couplings to 256 MHz with resistive couplings. The flat passband and high selectivity are achieved at the cost of an additional insertion loss (IL) of 1.1 dB. Since SIW cavities can provide higher unloaded Q-factor than microstrip resonators, a smaller in-band IL deterioration will be required with the lossy SIW filter than microstrip counterparts when a good passband flatness is desired, especially for narrow-band applications. Excellent agreement is observed between the simulated and measured results.","PeriodicalId":185971,"journal":{"name":"2016 IEEE MTT-S International Wireless Symposium (IWS)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126726444","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 : 2016-03-14DOI: 10.1109/IEEE-IWS.2016.7585415
Jianzhao Zhang, Yongxiang Liu, Chen Yong, Long Cao
Fast and precise spectrum opportunity (SOP) exploration is a fundamental and vital procedure for dynamic spectrum management. In this paper, the temporal rather than geographical feature of spectrum database is investigated. The spectrum prediction is formulated and taken as a function of spectrum database. Furthermore, spectrum sensing is also a choice for SOP exploration to cope with the inefficiency of the solely spectrum database approach on freshness of the information and the precise of the prediction. On that consideration, a joint SOP exploration (JSE) scheme is proposed which determines SOP based on joint spectrum sensing and the spectrum prediction enabled spectrum database. The advantages of spectrum database, spectrum prediction and spectrum sensing can be taken jointly to ascertain SOP. Extensive simulation results demonstrate that the proposed scheme can accommodate to diverse scenarios with different sensing ability of SUs and prediction ability of spectrum database, while the advantages of existing SOP exploration approaches can be jointly taken.
{"title":"Spectrum opportunity exploration based on joint spectrum sensing and the spectrum prediction enabled spectrum database","authors":"Jianzhao Zhang, Yongxiang Liu, Chen Yong, Long Cao","doi":"10.1109/IEEE-IWS.2016.7585415","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2016.7585415","url":null,"abstract":"Fast and precise spectrum opportunity (SOP) exploration is a fundamental and vital procedure for dynamic spectrum management. In this paper, the temporal rather than geographical feature of spectrum database is investigated. The spectrum prediction is formulated and taken as a function of spectrum database. Furthermore, spectrum sensing is also a choice for SOP exploration to cope with the inefficiency of the solely spectrum database approach on freshness of the information and the precise of the prediction. On that consideration, a joint SOP exploration (JSE) scheme is proposed which determines SOP based on joint spectrum sensing and the spectrum prediction enabled spectrum database. The advantages of spectrum database, spectrum prediction and spectrum sensing can be taken jointly to ascertain SOP. Extensive simulation results demonstrate that the proposed scheme can accommodate to diverse scenarios with different sensing ability of SUs and prediction ability of spectrum database, while the advantages of existing SOP exploration approaches can be jointly taken.","PeriodicalId":185971,"journal":{"name":"2016 IEEE MTT-S International Wireless Symposium (IWS)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116561002","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 2kW power amplifier module is described in this paper. It is designed to operate at C band, pulse width of 500 Ps, and duty cycle of 30%. The module has been physically implemented and achieved a high PAE of 30%, 63dBm output power and associated gain of 63dB. The main devices of this module are GaN HEMT power transistors working at class AB made in China. The output power of each transistor is more than 200 watts. In this paper, the main properties and key technologies of the GaN power amplifier module are presented.
{"title":"Design and realization of a C-band 2kW GaN power amplifier module","authors":"Zhang Haibing, Xu Xiaofan, Kuang Xiaole, Zhu Weitao","doi":"10.1109/IEEE-IWS.2016.7585461","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2016.7585461","url":null,"abstract":"A 2kW power amplifier module is described in this paper. It is designed to operate at C band, pulse width of 500 Ps, and duty cycle of 30%. The module has been physically implemented and achieved a high PAE of 30%, 63dBm output power and associated gain of 63dB. The main devices of this module are GaN HEMT power transistors working at class AB made in China. The output power of each transistor is more than 200 watts. In this paper, the main properties and key technologies of the GaN power amplifier module are presented.","PeriodicalId":185971,"journal":{"name":"2016 IEEE MTT-S International Wireless Symposium (IWS)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126284607","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 : 2016-03-14DOI: 10.1109/IEEE-IWS.2016.7585449
Zongtang Zhang, S. Xiao
The helical wave that carries orbital angular momentum has received much attention due to its potential in communications and other aspects. In this paper, a multimode concentric circularly polarized patch antenna is designed to generate multiple orbital angular momentum modes. The proposed antenna consists of three circularly polarized patches, one circular patch and two shorted annular ring patches, all in the same layer. Each circularly polarized patch corresponds to one OAM state respectively. All three patches are designed to operate at 2.45 GHz. The simulated electric field and radiation property are also presented.
{"title":"Generation of multiple orbital angular momentum (OAM) Modes with a circularly polarized multimode patch antenna","authors":"Zongtang Zhang, S. Xiao","doi":"10.1109/IEEE-IWS.2016.7585449","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2016.7585449","url":null,"abstract":"The helical wave that carries orbital angular momentum has received much attention due to its potential in communications and other aspects. In this paper, a multimode concentric circularly polarized patch antenna is designed to generate multiple orbital angular momentum modes. The proposed antenna consists of three circularly polarized patches, one circular patch and two shorted annular ring patches, all in the same layer. Each circularly polarized patch corresponds to one OAM state respectively. All three patches are designed to operate at 2.45 GHz. The simulated electric field and radiation property are also presented.","PeriodicalId":185971,"journal":{"name":"2016 IEEE MTT-S International Wireless Symposium (IWS)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126452971","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 : 2016-03-14DOI: 10.1109/IEEE-IWS.2016.7585431
Yao Wang, Liang Rong, Liangbo Xie, Jiaxin Liu, G. Wen
An on-chip sub-μW RC oscillator suitable for ultra-low power applications is presented. A technique that cancels both comparator delay and offset are proposed to improve the frequency stability against variations of temperature and supply voltage. This relaxation oscillator is designed and simulated in a 180-nm CMOS technology. The post layout simulation results show that the proposed circuit has a 1-cycle start-up time, and the frequency drift is less than ±0.6%. For the supply voltage changing from 0.9 to 1.2 V, the variation of frequency is -0.72% ~ +0.68% and the temperature coefficient is 75.5 ppm/°C over 0 to 90°C. The power consumption of the proposed oscillator is 255 nW at TT and 27°C.
{"title":"A 255nW 138kHz RC oscillator for ultra-low power applications","authors":"Yao Wang, Liang Rong, Liangbo Xie, Jiaxin Liu, G. Wen","doi":"10.1109/IEEE-IWS.2016.7585431","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2016.7585431","url":null,"abstract":"An on-chip sub-μW RC oscillator suitable for ultra-low power applications is presented. A technique that cancels both comparator delay and offset are proposed to improve the frequency stability against variations of temperature and supply voltage. This relaxation oscillator is designed and simulated in a 180-nm CMOS technology. The post layout simulation results show that the proposed circuit has a 1-cycle start-up time, and the frequency drift is less than ±0.6%. For the supply voltage changing from 0.9 to 1.2 V, the variation of frequency is -0.72% ~ +0.68% and the temperature coefficient is 75.5 ppm/°C over 0 to 90°C. The power consumption of the proposed oscillator is 255 nW at TT and 27°C.","PeriodicalId":185971,"journal":{"name":"2016 IEEE MTT-S International Wireless Symposium (IWS)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128088498","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 : 2016-03-14DOI: 10.1109/IEEE-IWS.2016.7585413
Chia-Ming Hsu, Kuan-Zhou Chen, Chieh-Sen Lee, Chin-Lung Yang
This paper presents a non-destructive planar single-compound triple complementary split-ring resonator (TCSRR) to improve the measurement of the dielectric constants of a material under test (MUT). This proposed microwave sensor technology requires the multiple-square concentric ring to generate multiple non-identical frequency responses to take estimate for dielectric property measurement, and the cooperated estimate of SC-TCSRR can effectively mitigate the permittivity measurement error. The dielectric constants and thickness of a MUT are dependent on the operational resonance frequency deviation. The CSRR sensor is etched on the ground plane of a microstrip line. The SC-TCSRR sensor operating between 1.5 GHz to 4.6 GHz band is fabricated by specific ratio range and tested for verification. For calculation and analysis, the permittivity of a MUT is extracted by two resonant frequencies (fM, fH). This proposed method uses three sets (fM, fH), fL, fM) and fL, fH) and averages the measured results to improve measurement accuracy. The experiments yielded average measurement errors less than 1.60 % for the permittivity of MUT. And, the result is more accurate than dual ring CSRR's measurement error result [1] 4.63%. This effective TCSRR sensor offers low computational costs, easy fabrication and precise measurement.
{"title":"Improved approach using multiple planar complementary split-ring resonators for accurate measurement of permittivity","authors":"Chia-Ming Hsu, Kuan-Zhou Chen, Chieh-Sen Lee, Chin-Lung Yang","doi":"10.1109/IEEE-IWS.2016.7585413","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2016.7585413","url":null,"abstract":"This paper presents a non-destructive planar single-compound triple complementary split-ring resonator (TCSRR) to improve the measurement of the dielectric constants of a material under test (MUT). This proposed microwave sensor technology requires the multiple-square concentric ring to generate multiple non-identical frequency responses to take estimate for dielectric property measurement, and the cooperated estimate of SC-TCSRR can effectively mitigate the permittivity measurement error. The dielectric constants and thickness of a MUT are dependent on the operational resonance frequency deviation. The CSRR sensor is etched on the ground plane of a microstrip line. The SC-TCSRR sensor operating between 1.5 GHz to 4.6 GHz band is fabricated by specific ratio range and tested for verification. For calculation and analysis, the permittivity of a MUT is extracted by two resonant frequencies (fM, fH). This proposed method uses three sets (fM, fH), fL, fM) and fL, fH) and averages the measured results to improve measurement accuracy. The experiments yielded average measurement errors less than 1.60 % for the permittivity of MUT. And, the result is more accurate than dual ring CSRR's measurement error result [1] 4.63%. This effective TCSRR sensor offers low computational costs, easy fabrication and precise measurement.","PeriodicalId":185971,"journal":{"name":"2016 IEEE MTT-S International Wireless Symposium (IWS)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134251257","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 : 2016-03-14DOI: 10.1109/IEEE-IWS.2016.7585460
Nurzhan Kalikulov, Refik Caglar Kizilirmak
The aim of this paper is to investigate the performance of orthogonal frequency division multiplexing (OFDM) based visible light communication systems (VLC) with multiple transmitters. We have modeled our scenario with two synchronously broadcasting transmitters and a single receiver. We then incorporate the cabling delay between the transmitters that cause periodic deep fades in the frequency response of the broadcasting channel. We propose to employ adaptive modulation in order to increase the spectral efficiency of the system. Simulation results demonstrate that adaptive modulation can improve the performance of OFDM based VLC systems for the considered practical channel conditions.
{"title":"Adaptive OFDM for VLC systems with multiple transmitters","authors":"Nurzhan Kalikulov, Refik Caglar Kizilirmak","doi":"10.1109/IEEE-IWS.2016.7585460","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2016.7585460","url":null,"abstract":"The aim of this paper is to investigate the performance of orthogonal frequency division multiplexing (OFDM) based visible light communication systems (VLC) with multiple transmitters. We have modeled our scenario with two synchronously broadcasting transmitters and a single receiver. We then incorporate the cabling delay between the transmitters that cause periodic deep fades in the frequency response of the broadcasting channel. We propose to employ adaptive modulation in order to increase the spectral efficiency of the system. Simulation results demonstrate that adaptive modulation can improve the performance of OFDM based VLC systems for the considered practical channel conditions.","PeriodicalId":185971,"journal":{"name":"2016 IEEE MTT-S International Wireless Symposium (IWS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131090937","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 : 2016-03-14DOI: 10.1109/IEEE-IWS.2016.7585480
R. Kalyan, K. Rawat, S. Koul
This paper proposes a reconfigurable and concurrent dual-band power amplifier for upcoming wireless applications such as LTE carrier aggregation. The designed power amplifier operates concurrently at 1600 MHz and 2100 MHz when the switches are OFF; whereas, when the switches are ON, the power amplifier operating frequencies shifts to 1800 MHz and 2300 MHz. Thus, the proposed power amplifier topology covers four different bands of operation while simultaneously operating at two bands. The measured results show a drain efficiency of 62%-67 % and approximate 10 W output power in all the four bands of operation.
{"title":"Design of reconfigurable concurrent dual-band power amplifiers using reconfigurable concurrent dual-band matching network","authors":"R. Kalyan, K. Rawat, S. Koul","doi":"10.1109/IEEE-IWS.2016.7585480","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2016.7585480","url":null,"abstract":"This paper proposes a reconfigurable and concurrent dual-band power amplifier for upcoming wireless applications such as LTE carrier aggregation. The designed power amplifier operates concurrently at 1600 MHz and 2100 MHz when the switches are OFF; whereas, when the switches are ON, the power amplifier operating frequencies shifts to 1800 MHz and 2300 MHz. Thus, the proposed power amplifier topology covers four different bands of operation while simultaneously operating at two bands. The measured results show a drain efficiency of 62%-67 % and approximate 10 W output power in all the four bands of operation.","PeriodicalId":185971,"journal":{"name":"2016 IEEE MTT-S International Wireless Symposium (IWS)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133294564","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 : 2016-03-14DOI: 10.1109/IEEE-IWS.2016.7585476
Jingjing Pu, F. Xu, S. Qiu
In this letter, a novel structure of a single split-ring resonator (S-SRR) is presented and discussed. Two metallic vias are combined with the S-SRR to improve the performance. A coplanar waveguide (CPW) loaded with the new structures and series gaps, which works as a band pass filter is simulated and fabricated. The proposed band pass filter reaches a high level of compactness, which provides a good choice for designing composite right-left handed (CRLH) transmission lines.
{"title":"A miniaturized coplanar waveguide band pass filter using novel single split-ring resonators","authors":"Jingjing Pu, F. Xu, S. Qiu","doi":"10.1109/IEEE-IWS.2016.7585476","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2016.7585476","url":null,"abstract":"In this letter, a novel structure of a single split-ring resonator (S-SRR) is presented and discussed. Two metallic vias are combined with the S-SRR to improve the performance. A coplanar waveguide (CPW) loaded with the new structures and series gaps, which works as a band pass filter is simulated and fabricated. The proposed band pass filter reaches a high level of compactness, which provides a good choice for designing composite right-left handed (CRLH) transmission lines.","PeriodicalId":185971,"journal":{"name":"2016 IEEE MTT-S International Wireless Symposium (IWS)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134471352","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}
After clutters suppression, the feasibility of applying compressive sensing (CS) in through-wall imaging (TWI) using spread spectrum (SS) radar is analyzed. Then CS is compared with the conventional back projection (BP) method in TWI. Results show that it is feasible and very effective to use CS to image the targets behind the wall with SS radar. Furthermore, compared with BP imaging, although the number of observation points using CS method has decreased by 67% and the data store using CS also has declined by 60%, the location accuracy of targets using CS is much higher than that using BP. This will lower the cost of hardware significantly and shorten the recording time greatly.
{"title":"Compressive sensing for through-wall imaging with spread spectrum radar","authors":"Xue-Hu Zhang, Xiaoli Xi, Yurong Pu, Chen Zheng, Daocheng Wu","doi":"10.1109/IEEE-IWS.2016.7585489","DOIUrl":"https://doi.org/10.1109/IEEE-IWS.2016.7585489","url":null,"abstract":"After clutters suppression, the feasibility of applying compressive sensing (CS) in through-wall imaging (TWI) using spread spectrum (SS) radar is analyzed. Then CS is compared with the conventional back projection (BP) method in TWI. Results show that it is feasible and very effective to use CS to image the targets behind the wall with SS radar. Furthermore, compared with BP imaging, although the number of observation points using CS method has decreased by 67% and the data store using CS also has declined by 60%, the location accuracy of targets using CS is much higher than that using BP. This will lower the cost of hardware significantly and shorten the recording time greatly.","PeriodicalId":185971,"journal":{"name":"2016 IEEE MTT-S International Wireless Symposium (IWS)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115113410","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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