Pub Date : 2019-06-20DOI: 10.23919/URSIAP-RASC.2019.8738625
Z. Slavik, O. Bringmann, W. Rosenstiel
Automated driving reveals various shortcomings of today’s commercial automotive radar systems. We address them by proposing a noise modulated pulse-Doppler radar system that uses a subset of usually required correlation filters at the receiver stage. With a validated phenomenological radar sensor model we evaluated the radar performance in various conditions such as low signal-to-noise-ratio (SNR) and interference and compared it against a commercial frequency-modulated continuous wave (FMCW) radar.
{"title":"Approaches for Interference-proof Future Radar Systems","authors":"Z. Slavik, O. Bringmann, W. Rosenstiel","doi":"10.23919/URSIAP-RASC.2019.8738625","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738625","url":null,"abstract":"Automated driving reveals various shortcomings of today’s commercial automotive radar systems. We address them by proposing a noise modulated pulse-Doppler radar system that uses a subset of usually required correlation filters at the receiver stage. With a validated phenomenological radar sensor model we evaluated the radar performance in various conditions such as low signal-to-noise-ratio (SNR) and interference and compared it against a commercial frequency-modulated continuous wave (FMCW) radar.","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120991457","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 : 2019-06-20DOI: 10.23919/URSIAP-RASC.2019.8738398
Sina Hashemizadeh, Y. Kato, M. Horibe, N. Kuster
Measurements of the complex permittivity of materials as functions of frequency provide valuable information in different fields of engineering, industry, medicine and physical chemistry. Open-Ended Coaxial probes (OCP) are commonly used as nondestructive testing tools for dielectric analysis. The method, although nondestructive, does have limitations. For example, if there is an air gap between sample and probe, the discontinuity in the normal electric field causes a considerable error in the predicted permittivity. Even a small gap of the order 10μm in thickness can produce large errors in permittivity measurement by sensors (10% or more) because it lies in the region where the fringing fields are most intense [1]. For this reason, usually the probe use has been limited to liquid and semiliquid measurements, where good contact can be obtained.
{"title":"Evaluation of Dielectric Measurements upon Thin Single Layer Solids using OpenCoaxial Probe Technology","authors":"Sina Hashemizadeh, Y. Kato, M. Horibe, N. Kuster","doi":"10.23919/URSIAP-RASC.2019.8738398","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738398","url":null,"abstract":"Measurements of the complex permittivity of materials as functions of frequency provide valuable information in different fields of engineering, industry, medicine and physical chemistry. Open-Ended Coaxial probes (OCP) are commonly used as nondestructive testing tools for dielectric analysis. The method, although nondestructive, does have limitations. For example, if there is an air gap between sample and probe, the discontinuity in the normal electric field causes a considerable error in the predicted permittivity. Even a small gap of the order 10μm in thickness can produce large errors in permittivity measurement by sensors (10% or more) because it lies in the region where the fringing fields are most intense [1]. For this reason, usually the probe use has been limited to liquid and semiliquid measurements, where good contact can be obtained.","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117066502","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 : 2019-06-20DOI: 10.23919/URSIAP-RASC.2019.8738210
S. Pfeifer, N. Jain, S. Kuehn, E. Neufeld, K. Pokovic, J. Xi, A. Christ, N. Kuster
A novel measurement system and a 3D field reconstruction method with near-to-near field and near-to-far field forward transformation are described for wireless transmitters operating at frequencies from 6 – 110 GHz. Measurements are taken as close as $lambda /6$ and the reconstructed 3D field distributions are compared against simulated results. The uncertainty in the measurement plane is better than 1.4 dB. The uncertainty budget at arbitrary observation points will be developed and validated by simulations and far-field measurement systems.
{"title":"mm-Wave Experimental Scanning System to Determine the Complete Field by Near-to-Near Field and Near-to-Far Field Transformation","authors":"S. Pfeifer, N. Jain, S. Kuehn, E. Neufeld, K. Pokovic, J. Xi, A. Christ, N. Kuster","doi":"10.23919/URSIAP-RASC.2019.8738210","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738210","url":null,"abstract":"A novel measurement system and a 3D field reconstruction method with near-to-near field and near-to-far field forward transformation are described for wireless transmitters operating at frequencies from 6 – 110 GHz. Measurements are taken as close as $lambda /6$ and the reconstructed 3D field distributions are compared against simulated results. The uncertainty in the measurement plane is better than 1.4 dB. The uncertainty budget at arbitrary observation points will be developed and validated by simulations and far-field measurement systems.","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125133549","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 : 2019-03-26DOI: 10.23919/URSIAP-RASC.2019.8738664
M. Filic, R. Filjar
Space weather, geomagnetic and ionospheric conditions are the most prominent single cause of the Global Navigation Satellite System (GNSS) positioning performance degradation, through introduction of the GNSS signal ionospheric delay. This affects numerous GNSS-based technology and socio-economic systems and services. Analyses of case-studies of GNSS positioning performance degradation contribute to characterization of the GNSS positioning error, and support error correction methods and models development. Here a case of rapidly developing ionospheric storm is examined, with the aim of the event characterization using a low-cost Sudden Ionospheric Disturbance (SID) monitor observations of lower ionospheric levels condition through continuous reception of Very Low Frequency (VLF) signal strength values. Time series of observations, taken in Croatia during the St Patrick 2015 event of fast development of the large ionospheric storm, were compared with time series of dual-frequency GPS-derived observations of Total Electronic Content (TEC), a parameter linearly related to GNSS ionospheric delay. A comparison framework has been developed in the open-source R programming framework for statistical computing. Time series of SID and GNSS-based TEC observations were examined for cross-correlation. The research revealed correspondence between two time series. Although not linear, the correspondence identified may be used for an early warning for potential GNSS positioning performance deterioration. Further to this, it may serve as the foundation for understanding of the lower ionosphere contribution to the over-all TEC, and thus to formation of the GNSS ionospheric delay. Our team intends to explore both research directions in forthcoming studies.
{"title":"On correlation between SID monitor and GPS-derived TEC observations during a massive ionospheric storm development","authors":"M. Filic, R. Filjar","doi":"10.23919/URSIAP-RASC.2019.8738664","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738664","url":null,"abstract":"Space weather, geomagnetic and ionospheric conditions are the most prominent single cause of the Global Navigation Satellite System (GNSS) positioning performance degradation, through introduction of the GNSS signal ionospheric delay. This affects numerous GNSS-based technology and socio-economic systems and services. Analyses of case-studies of GNSS positioning performance degradation contribute to characterization of the GNSS positioning error, and support error correction methods and models development. Here a case of rapidly developing ionospheric storm is examined, with the aim of the event characterization using a low-cost Sudden Ionospheric Disturbance (SID) monitor observations of lower ionospheric levels condition through continuous reception of Very Low Frequency (VLF) signal strength values. Time series of observations, taken in Croatia during the St Patrick 2015 event of fast development of the large ionospheric storm, were compared with time series of dual-frequency GPS-derived observations of Total Electronic Content (TEC), a parameter linearly related to GNSS ionospheric delay. A comparison framework has been developed in the open-source R programming framework for statistical computing. Time series of SID and GNSS-based TEC observations were examined for cross-correlation. The research revealed correspondence between two time series. Although not linear, the correspondence identified may be used for an early warning for potential GNSS positioning performance deterioration. Further to this, it may serve as the foundation for understanding of the lower ionosphere contribution to the over-all TEC, and thus to formation of the GNSS ionospheric delay. Our team intends to explore both research directions in forthcoming studies.","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116645430","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}
Interferometric imaging is an alternative passive imaging method developed originally from radio astronomy from 1960’s. Comparing with the traditional real aperture system, interferometric synthetic aperture system can realize much better spatial resolution by using thinned array. Since 1980’s, this technique had been introduced in earth observation community, aiming to realize the soil moisture and ocean salinity measurement at L-band from space [1]. From 2000’s, several instrument concepts at millimeter wave (53GHz & 183GHz) had been proposed to support the next-generation geostationary orbit(GEO) meteorological satellites [2, 3, 4].
{"title":"Enabling Technologies for High Performance Microwave and MM wave Interferometric Radiometers","authors":"Hao Liu, Lijie Niu, Wei Chen, Hao Lu, Cheng Zhang, Ji Wu","doi":"10.23919/URSIAP-RASC.2019.8738678","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738678","url":null,"abstract":"Interferometric imaging is an alternative passive imaging method developed originally from radio astronomy from 1960’s. Comparing with the traditional real aperture system, interferometric synthetic aperture system can realize much better spatial resolution by using thinned array. Since 1980’s, this technique had been introduced in earth observation community, aiming to realize the soil moisture and ocean salinity measurement at L-band from space [1]. From 2000’s, several instrument concepts at millimeter wave (53GHz & 183GHz) had been proposed to support the next-generation geostationary orbit(GEO) meteorological satellites [2, 3, 4].","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125539772","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 : 2019-03-09DOI: 10.23919/URSIAP-RASC.2019.8738659
A. Maurya, M. Cohen, K. N. Kumar, D. Phanikumar, Rajesh Singh
It has been known that the atmospheric gravity waves (AGWs) play a major role in shaping up the structure and dynamics of lower, middle and upper atmosphere [1, 2], and relates to various phenomena in the thermosphere. VLF remote sensing is a well-established technique to monitor D-region conditions, including AGWs. We have analyzed various VLF navigation transmitter signals recorded at VLF recording station in North Carolina, USA, called PARI (35.2 N, 82.9 W) for a one-year period from May 2015 to April 2016. The VLF signal (both amplitude and phase) show wave like signature (WLS) in different Transmitter-receiver great circle path (TRGCPs). We have found three event days namely 02 May 2015, 21 January 2016 and 21 April 2016, with periodic variations of 1.2 -3 minutes. One example of observed Wavy signature on VLF transmitter on 21 January 2016 is shown as Figure 1. In general, the period of AGWs is longer than the background oscillations known as Brunt-Vaisala period (BV period) but in the present case observed periods are much lower than the BV periods (∼5 minutes). Initial analysis suggests that the probable source of observed WLSs is convective (from lightning discharges/thunderstorm) generated AGWs propagating upward from troposphere. The source regions are identified using lightning location network and satellite data. The more details on the properties and possible source are discussed.
大气重力波(AGWs)在形成低层、中层和高层大气的结构和动力学方面起着重要作用[1,2]，并与热层中的各种现象有关。VLF遥感是一种成熟的监测d区条件的技术，包括agw。我们分析了2015年5月至2016年4月期间在美国北卡罗来纳州名为PARI (35.2 N, 82.9 W)的VLF记录站记录的各种VLF导航发射机信号。在不同的收发大圆路径(TRGCPs)上，VLF信号(振幅和相位)都表现出波状特征(WLS)。我们发现了三个事件日，即2015年5月2日，2016年1月21日和2016年4月21日，周期变化为1.2 -3分钟。2016年1月21日在VLF发射机上观测到的波形特征示例如图1所示。一般来说，AGWs的周期长于被称为Brunt-Vaisala周期(BV周期)的背景振荡，但在目前的情况下观测到的周期远低于BV周期(~ 5分钟)。初步分析显示，观测到的WLSs的可能来源是由对流层向上传播的对流(由闪电放电/雷暴)产生的AGWs。利用闪电定位网络和卫星数据确定震源区域。讨论了有关属性和可能来源的更多细节。
{"title":"The low period atmospheric gravity waves observed using Very Low Frequency signals","authors":"A. Maurya, M. Cohen, K. N. Kumar, D. Phanikumar, Rajesh Singh","doi":"10.23919/URSIAP-RASC.2019.8738659","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738659","url":null,"abstract":"It has been known that the atmospheric gravity waves (AGWs) play a major role in shaping up the structure and dynamics of lower, middle and upper atmosphere [1, 2], and relates to various phenomena in the thermosphere. VLF remote sensing is a well-established technique to monitor D-region conditions, including AGWs. We have analyzed various VLF navigation transmitter signals recorded at VLF recording station in North Carolina, USA, called PARI (35.2 N, 82.9 W) for a one-year period from May 2015 to April 2016. The VLF signal (both amplitude and phase) show wave like signature (WLS) in different Transmitter-receiver great circle path (TRGCPs). We have found three event days namely 02 May 2015, 21 January 2016 and 21 April 2016, with periodic variations of 1.2 -3 minutes. One example of observed Wavy signature on VLF transmitter on 21 January 2016 is shown as Figure 1. In general, the period of AGWs is longer than the background oscillations known as Brunt-Vaisala period (BV period) but in the present case observed periods are much lower than the BV periods (∼5 minutes). Initial analysis suggests that the probable source of observed WLSs is convective (from lightning discharges/thunderstorm) generated AGWs propagating upward from troposphere. The source regions are identified using lightning location network and satellite data. The more details on the properties and possible source are discussed.","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125890752","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}
Metamaterials are well-known for their tunable and unnatural properties that are not usually accessible in natural materials. Recently, there is a large growing interest in the actively tunable metamaterials, where their structural/optical can be actively tuned using an external means, such as optical pulse, thermal and electrical controls. Among them the microelectromechanical systems (MEMS) based metamaterials have given useful features of multiple controls in engineering their structural geometry in all the three-spatial directions of the sample at the THz frequencies. This allows to probe and engineer unique and intriguing near-field coupling phenomena in metamaterials, thereby obtaining the electro-optical properties on demand.
{"title":"Reconfigurable MEMS metamaterial based active THz photonics","authors":"Manukumara Manjappa, Prakash Pitchappa, Ranjan Singh","doi":"10.23919/URSIAP-RASC.2019.8738366","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738366","url":null,"abstract":"Metamaterials are well-known for their tunable and unnatural properties that are not usually accessible in natural materials. Recently, there is a large growing interest in the actively tunable metamaterials, where their structural/optical can be actively tuned using an external means, such as optical pulse, thermal and electrical controls. Among them the microelectromechanical systems (MEMS) based metamaterials have given useful features of multiple controls in engineering their structural geometry in all the three-spatial directions of the sample at the THz frequencies. This allows to probe and engineer unique and intriguing near-field coupling phenomena in metamaterials, thereby obtaining the electro-optical properties on demand.","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131034450","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 : 2019-03-09DOI: 10.23919/URSIAP-RASC.2019.8738430
R. Pant, S. A.
Generation and processing of RF signals using photonic technologies enable electromagnetic interference (EMI) free low loss, light weight microwave photonic processor [1]. Generation of RF signals is typically achieved by beating multiple optical frequencies, which are created by exploiting nonlinear optical phenomenon in high-Q resonators [2]. RF photonic signal processing, on the other hand, is performed by modulating a laser with the incoming RF signal and processing one of the modulation side bands using active or passive optical resonance to achieve microwave photonic notch filter, RF switch, etc. [3]. Many of these photonics based RF signal processors use a phase modulator or a dual-parallel Mach-Zehnder modulator and a passive filter to create out-of-phase side bands with unequal amplitude. An active or passive resonance is then used to equalize the amplitude of the two out-of-phase sidebands [3, 4]. The resulting destructive interference between the beat signals, which are obtained by beating of the carrier with upper and lower sidebands, results in creation of a rejection band centered at the frequency of equal amplitude. Since the two sidebands are out-of-phase, the induced insertion loss is high because of cancellation in the pass band.
{"title":"Microwave photonic signal processing exploiting coherent interactions between Brillouin Stokes and anti-Stokes resonances","authors":"R. Pant, S. A.","doi":"10.23919/URSIAP-RASC.2019.8738430","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738430","url":null,"abstract":"Generation and processing of RF signals using photonic technologies enable electromagnetic interference (EMI) free low loss, light weight microwave photonic processor [1]. Generation of RF signals is typically achieved by beating multiple optical frequencies, which are created by exploiting nonlinear optical phenomenon in high-Q resonators [2]. RF photonic signal processing, on the other hand, is performed by modulating a laser with the incoming RF signal and processing one of the modulation side bands using active or passive optical resonance to achieve microwave photonic notch filter, RF switch, etc. [3]. Many of these photonics based RF signal processors use a phase modulator or a dual-parallel Mach-Zehnder modulator and a passive filter to create out-of-phase side bands with unequal amplitude. An active or passive resonance is then used to equalize the amplitude of the two out-of-phase sidebands [3, 4]. The resulting destructive interference between the beat signals, which are obtained by beating of the carrier with upper and lower sidebands, results in creation of a rejection band centered at the frequency of equal amplitude. Since the two sidebands are out-of-phase, the induced insertion loss is high because of cancellation in the pass band.","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121506252","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 : 2019-03-09DOI: 10.23919/URSIAP-RASC.2019.8738646
M. Ameen, S. Kalraiya, R. Chaudhary
A new, compact and low profile triple band metamaterial (MTM) antenna based on the open-ended configuration of composite right/left-handed (CRLH) transmission line (TL) is discussed in this paper. The intended antenna obtains a compact size $( ka = 0.8 lt 1)$ due to its zeroth order resonance (ZOR) property with an overall electrical dimension of $0.16 lambda _{0} times 0.19 lambda _{0}, times 0.004 lambda _{0}$ at 2.16 GHz and an overall antenna dimensions of $23 times 27 times 0.6$ mm3. The antenna covers three resonances from (2.14–2.18 GHz), (3.14–3.65 GHz), and (4.59–7.34 GHz) frequency bands with -10 dB S11 bandwidths of 1.85%, 15.22%, and 49.10% for the three frequency bands. The intended MTM antenna provides an average gain of 2 dBi, 1.2 dBi, and 4 dBi respectively for the three resonances. Measured S11 shows almost similar result with the simulated result demonstrates that the intended triple band MTM antenna is appropriate for working in the 2.2 GHz UMTS, 3.6/5.2/5.8 GHz WLAN, and 3.3/3.5/5.5 GHz WiMAX applications.
{"title":"A Compact Low Profile Modified ACS-fed Triple Band Open-Ended Metamaterial Antenna for UMTS, WLAN, and WiMAX Applications","authors":"M. Ameen, S. Kalraiya, R. Chaudhary","doi":"10.23919/URSIAP-RASC.2019.8738646","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738646","url":null,"abstract":"A new, compact and low profile triple band metamaterial (MTM) antenna based on the open-ended configuration of composite right/left-handed (CRLH) transmission line (TL) is discussed in this paper. The intended antenna obtains a compact size $( ka = 0.8 lt 1)$ due to its zeroth order resonance (ZOR) property with an overall electrical dimension of $0.16 lambda _{0} times 0.19 lambda _{0}, times 0.004 lambda _{0}$ at 2.16 GHz and an overall antenna dimensions of $23 times 27 times 0.6$ mm3. The antenna covers three resonances from (2.14–2.18 GHz), (3.14–3.65 GHz), and (4.59–7.34 GHz) frequency bands with -10 dB S11 bandwidths of 1.85%, 15.22%, and 49.10% for the three frequency bands. The intended MTM antenna provides an average gain of 2 dBi, 1.2 dBi, and 4 dBi respectively for the three resonances. Measured S11 shows almost similar result with the simulated result demonstrates that the intended triple band MTM antenna is appropriate for working in the 2.2 GHz UMTS, 3.6/5.2/5.8 GHz WLAN, and 3.3/3.5/5.5 GHz WiMAX applications.","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122538863","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 : 2019-03-09DOI: 10.23919/URSIAP-RASC.2019.8738396
Rajarshi Bhattacharyya, Jyoti, Aman Gupta, O. Prakash, Somnath C. Roy, Tapas Bhattacharyya, P. Maiti, Somak Bhattacharyya, Santanu Das
We report the in-situ synthesis of (M$g_{0.5} Zn_{0.5}$)$Fe_{2}O_{4}$-graphene oxide (MZF-GO) ferrite nanoparticle hybrid nanocomposite by auto-combustion technique followed by fabrication of homogeneous, structurally stable thin layer (-100-120 $mu$m) of nanocomposite-polyurethane coating on metallic substrate (A1) and its application on the properties of broadband microwave absorption over the gigahertz (GHz) frequency range. Microstructure studies of nanocomposites depicted that small sized ferrite nanoparticles $(-24 pm 6 nm)$ are grafted on and through the graphene layers, which forms a homogeneous coating. The nanocomposite-polymer coating demonstrated excellent broadband absorption properties with absorptivity of greater than 85%. The nanocomposite-polymer coating showed good absorptivity over the frequency band of 4-15 GHz, which has numerous practical applications as radar absorbing materials (RAM), stealth technology, electromagnetic shielding, and many more.
{"title":"In-situ synthesis of (Mg0.5Zn0.5)Fe2O4-graphene oxide nanocomposite for broadband microwave absorption in GHz frequency range","authors":"Rajarshi Bhattacharyya, Jyoti, Aman Gupta, O. Prakash, Somnath C. Roy, Tapas Bhattacharyya, P. Maiti, Somak Bhattacharyya, Santanu Das","doi":"10.23919/URSIAP-RASC.2019.8738396","DOIUrl":"https://doi.org/10.23919/URSIAP-RASC.2019.8738396","url":null,"abstract":"We report the in-situ synthesis of (M$g_{0.5} Zn_{0.5}$)$Fe_{2}O_{4}$-graphene oxide (MZF-GO) ferrite nanoparticle hybrid nanocomposite by auto-combustion technique followed by fabrication of homogeneous, structurally stable thin layer (-100-120 $mu$m) of nanocomposite-polyurethane coating on metallic substrate (A1) and its application on the properties of broadband microwave absorption over the gigahertz (GHz) frequency range. Microstructure studies of nanocomposites depicted that small sized ferrite nanoparticles $(-24 pm 6 nm)$ are grafted on and through the graphene layers, which forms a homogeneous coating. The nanocomposite-polymer coating demonstrated excellent broadband absorption properties with absorptivity of greater than 85%. The nanocomposite-polymer coating showed good absorptivity over the frequency band of 4-15 GHz, which has numerous practical applications as radar absorbing materials (RAM), stealth technology, electromagnetic shielding, and many more.","PeriodicalId":344386,"journal":{"name":"2019 URSI Asia-Pacific Radio Science Conference (AP-RASC)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133303685","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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