Pub Date : 2021-11-01DOI: 10.1109/comcas52219.2021.9629089
Yanyu Jiang, Qianchu Zhang, B. Katsnelson
The report examines the propagation of a sound field from a point source down the slope in the area of the coastal wedge of the ocean in the presence of a sound speed profile (thermocline). It is shown that the presence of the thermocline leads to the appearance of local areas of strong mode coupling and, accordingly, to specific spatial variability of the sound field. The theory and results of modeling the variability of the sound field in a wedge on the basis of the parabolic equation and adiabatic mode theory are presented.
{"title":"Sound Field Variability and Mode Coupling in Area of Coastal Wedge in the Ocean","authors":"Yanyu Jiang, Qianchu Zhang, B. Katsnelson","doi":"10.1109/comcas52219.2021.9629089","DOIUrl":"https://doi.org/10.1109/comcas52219.2021.9629089","url":null,"abstract":"The report examines the propagation of a sound field from a point source down the slope in the area of the coastal wedge of the ocean in the presence of a sound speed profile (thermocline). It is shown that the presence of the thermocline leads to the appearance of local areas of strong mode coupling and, accordingly, to specific spatial variability of the sound field. The theory and results of modeling the variability of the sound field in a wedge on the basis of the parabolic equation and adiabatic mode theory are presented.","PeriodicalId":354885,"journal":{"name":"2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)","volume":"72 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120925054","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 : 2021-11-01DOI: 10.1109/comcas52219.2021.9629114
Y. Tzabari, R. Shavit
This paper presents a novel method for surface impedance characterization for a metasurface with printed elements and arbitrary geometry. The modeling of the metasurface as a surface impedance simplifies the entire design cycle of a multilayer metasurface structure and enables analysis using transmission line theory. The proposed method is compared to HFSS simulations and very good agreement was obtained. Using the proposed model, a flat lens antenna based on a multilayer metasurface structure with printed elements that locally corrects the phase has been designed. The performance of the proposed lens in terms of radiation pattern and gain is satisfactory.
{"title":"Flat Lens Antenna Design Based on Metasurfaces with Printed Elements using Tensor Surface Impedance Model","authors":"Y. Tzabari, R. Shavit","doi":"10.1109/comcas52219.2021.9629114","DOIUrl":"https://doi.org/10.1109/comcas52219.2021.9629114","url":null,"abstract":"This paper presents a novel method for surface impedance characterization for a metasurface with printed elements and arbitrary geometry. The modeling of the metasurface as a surface impedance simplifies the entire design cycle of a multilayer metasurface structure and enables analysis using transmission line theory. The proposed method is compared to HFSS simulations and very good agreement was obtained. Using the proposed model, a flat lens antenna based on a multilayer metasurface structure with printed elements that locally corrects the phase has been designed. The performance of the proposed lens in terms of radiation pattern and gain is satisfactory.","PeriodicalId":354885,"journal":{"name":"2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122579169","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 : 2021-11-01DOI: 10.1109/comcas52219.2021.9629003
Erez Loebl, Nimrod Ginzberg, E. Cohen
This work presents a neural network (NN) implementation of a digital self-interference cancellation (SIC) filter and a digital predistortion (DPD) linearizer in a quadrature balanced full duplex (FD) transceiver front-end. A quantitative description of the NNs design and functionality is laid out. The proposed algorithms were evaluated in measurements using a discrete-component quadrature balanced RF front-end and a 20 MHz 802.11ac WiFi signal with 10 dB peak-to-average power ratio (PAPR) around the center frequency of 2.4 GHz. At 13 dBm average transmit (TX) power, the NN-DPD corrects TX error vector magnitude (EVM) by 13 dB to the value of -41.5 dB. Total TX-RX isolation of 50 dB is demonstrated in the RF domain, out of which 20 dB is contributed by the passive TX-RX isolation and 30 dB by active TX leakage suppression using the NN SIC filter.
{"title":"Neural Network-Based Digital Predistortion and Self-Interference Cancellation in a Quadrature Balanced Full Duplex Transmitter","authors":"Erez Loebl, Nimrod Ginzberg, E. Cohen","doi":"10.1109/comcas52219.2021.9629003","DOIUrl":"https://doi.org/10.1109/comcas52219.2021.9629003","url":null,"abstract":"This work presents a neural network (NN) implementation of a digital self-interference cancellation (SIC) filter and a digital predistortion (DPD) linearizer in a quadrature balanced full duplex (FD) transceiver front-end. A quantitative description of the NNs design and functionality is laid out. The proposed algorithms were evaluated in measurements using a discrete-component quadrature balanced RF front-end and a 20 MHz 802.11ac WiFi signal with 10 dB peak-to-average power ratio (PAPR) around the center frequency of 2.4 GHz. At 13 dBm average transmit (TX) power, the NN-DPD corrects TX error vector magnitude (EVM) by 13 dB to the value of -41.5 dB. Total TX-RX isolation of 50 dB is demonstrated in the RF domain, out of which 20 dB is contributed by the passive TX-RX isolation and 30 dB by active TX leakage suppression using the NN SIC filter.","PeriodicalId":354885,"journal":{"name":"2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122625261","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 : 2021-11-01DOI: 10.1109/comcas52219.2021.9629115
{"title":"COMCAS 2021 Committees","authors":"","doi":"10.1109/comcas52219.2021.9629115","DOIUrl":"https://doi.org/10.1109/comcas52219.2021.9629115","url":null,"abstract":"","PeriodicalId":354885,"journal":{"name":"2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123940018","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 : 2021-11-01DOI: 10.1109/comcas52219.2021.9629100
M. Kulygin, D. Schegolkov, V. Belousov, A. Chirkov, I. N. Shevelev, I. Litovsky
The urgency of the problem of obtaining gigawatt nanosecond microwave pulses is due to the growing popularity of the concept of terahertz acceleration of charged particles. The aim of this project is to develop a new gigawatt range of peak powers of nanosecond pulses in the 170 GHz frequency range. Open resonator active traveling wave compressors promise the highest possible compression ratio. The compressor is based on the well-known open 3-mirror scheme, with the power input using spatial harmonics transformation effect at a coupling mirror with a sinusoidal corrugation. A differential equation describing the process of excitation is derived from basic principles. The efficiency of the active compressor depends on the regime of pumping. We can see that the less thickness of the active element is used, the more efficiency and compression ratio can be achieved.
{"title":"Nanosecond Gigawatt Compressor Excitation Dynamics","authors":"M. Kulygin, D. Schegolkov, V. Belousov, A. Chirkov, I. N. Shevelev, I. Litovsky","doi":"10.1109/comcas52219.2021.9629100","DOIUrl":"https://doi.org/10.1109/comcas52219.2021.9629100","url":null,"abstract":"The urgency of the problem of obtaining gigawatt nanosecond microwave pulses is due to the growing popularity of the concept of terahertz acceleration of charged particles. The aim of this project is to develop a new gigawatt range of peak powers of nanosecond pulses in the 170 GHz frequency range. Open resonator active traveling wave compressors promise the highest possible compression ratio. The compressor is based on the well-known open 3-mirror scheme, with the power input using spatial harmonics transformation effect at a coupling mirror with a sinusoidal corrugation. A differential equation describing the process of excitation is derived from basic principles. The efficiency of the active compressor depends on the regime of pumping. We can see that the less thickness of the active element is used, the more efficiency and compression ratio can be achieved.","PeriodicalId":354885,"journal":{"name":"2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126738727","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 : 2021-11-01DOI: 10.1109/comcas52219.2021.9629017
Yair Adar, Y. Golovachev
Optimal incubation protocol plays an important role in increasing incubator efficiency. The incubation program includes changes and adjustments of environmental variables such as temperature, humidity and carbon dioxide level (CO2), corresponding to the type of the egg. Embryo development stages can be identified according to measured characteristics, such as photo-plethysmography (PPG) and transmitted light intensity through the eggshell. Monitoring the development of poultry embryos during the incubation process can improve an optimal incubator protocol. In this article, we present an analysis of PPG signals and candling light intensity for monitoring embryonic development during the incubation process.
{"title":"Monitoring Poultry Embryo Development During Incubation Process Via Electro-Optical Signals","authors":"Yair Adar, Y. Golovachev","doi":"10.1109/comcas52219.2021.9629017","DOIUrl":"https://doi.org/10.1109/comcas52219.2021.9629017","url":null,"abstract":"Optimal incubation protocol plays an important role in increasing incubator efficiency. The incubation program includes changes and adjustments of environmental variables such as temperature, humidity and carbon dioxide level (CO2), corresponding to the type of the egg. Embryo development stages can be identified according to measured characteristics, such as photo-plethysmography (PPG) and transmitted light intensity through the eggshell. Monitoring the development of poultry embryos during the incubation process can improve an optimal incubator protocol. In this article, we present an analysis of PPG signals and candling light intensity for monitoring embryonic development during the incubation process.","PeriodicalId":354885,"journal":{"name":"2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124087815","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 : 2021-11-01DOI: 10.1109/comcas52219.2021.9629102
A. Kumar
A non-invasive feeding method to excite the electric monopole mode (TM01δ mode) of a cylindrical dielectric resonator (DR) antenna or DRA is presented. The feed comprises a non-resonant circular metallic patch with four symmetric stubs, fed by a coaxial probe. The monopole mode of the DRA is excited by the patch rather than the probe, hence the need to drill an axial hole in the DR for conventional probe insertion (invasive feed) is avoided. Using ANSYS HFSS simulations, the viability of this new feed is demonstrated and results are compared with that of a probe-fed DRA exciting the same mode.
{"title":"A Non-Invasive Feed Approach to Excite the Electric Monopole Mode of a Dielectric Resonator Antenna","authors":"A. Kumar","doi":"10.1109/comcas52219.2021.9629102","DOIUrl":"https://doi.org/10.1109/comcas52219.2021.9629102","url":null,"abstract":"A non-invasive feeding method to excite the electric monopole mode (TM01δ mode) of a cylindrical dielectric resonator (DR) antenna or DRA is presented. The feed comprises a non-resonant circular metallic patch with four symmetric stubs, fed by a coaxial probe. The monopole mode of the DRA is excited by the patch rather than the probe, hence the need to drill an axial hole in the DR for conventional probe insertion (invasive feed) is avoided. Using ANSYS HFSS simulations, the viability of this new feed is demonstrated and results are compared with that of a probe-fed DRA exciting the same mode.","PeriodicalId":354885,"journal":{"name":"2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131341204","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 : 2021-11-01DOI: 10.1109/comcas52219.2021.9629030
Yu. Voloshyn, S. Kulish, V. Oliynyk
The article considers the general characteristics of information wave technology and prospects for its application in medicine. The main effects of information-wave technology are described and aspects of information-wave interactions that can be used in medical practice are studied. Experimental studies have been performed on biological objects using the ultra-low-intensity broadband spark generator. The paper considers the theoretical substantiation and a new solution to the scientific problem of finding ways to determine and establish the effect of low-intensity MM range electromagnetic radiation on rat bone marrow cells. A method of data statistical processing has been proposed and the dependence of the decrease in the number of dead cells on the time of irradiation has been experimentally proved, as well as an improved method for determining the effect of an external destabilizing factor on the culture of rat bone marrow cells in vitro.
{"title":"Information-wave interactions of ultra-low intensity electromagnetic fields with biological systems","authors":"Yu. Voloshyn, S. Kulish, V. Oliynyk","doi":"10.1109/comcas52219.2021.9629030","DOIUrl":"https://doi.org/10.1109/comcas52219.2021.9629030","url":null,"abstract":"The article considers the general characteristics of information wave technology and prospects for its application in medicine. The main effects of information-wave technology are described and aspects of information-wave interactions that can be used in medical practice are studied. Experimental studies have been performed on biological objects using the ultra-low-intensity broadband spark generator. The paper considers the theoretical substantiation and a new solution to the scientific problem of finding ways to determine and establish the effect of low-intensity MM range electromagnetic radiation on rat bone marrow cells. A method of data statistical processing has been proposed and the dependence of the decrease in the number of dead cells on the time of irradiation has been experimentally proved, as well as an improved method for determining the effect of an external destabilizing factor on the culture of rat bone marrow cells in vitro.","PeriodicalId":354885,"journal":{"name":"2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130303253","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 : 2021-11-01DOI: 10.1109/comcas52219.2021.9629041
Chaoyi He, Anil Korkmaz, Sam Palermo, R. S. Williams, L. Katehi
A memristor is a nanoscale resistive switching device identified in 2009 [1], [4] as the fourth circuit element along with the resistor, the capacitor and the inductor. Since then, most of the research effort has focused on the design and fabrication of resistors to mitigate problems faced in todays computing circuits including Neumann’s bottleneck and the anticipated end of Moore’s Law. Memristors configured as node elements of a crossbar array circuit have demonstrated the capability to perform vector-matrix multiplications in one time step, regardless of the size of the vector-matrix pair [8]. Using the intrinsic memristor non-volatile resistance and the circuit properties of a cross-bar, this paper explores the use of a memristor cross-bar configuration in the analog domain. Specifically, the design and implementation of the memristor crossbar array concept in the design of a filter-mixer combination is demonstrated. In the proposed architecture, the memristor crossbar arrays can be programmed and re-programmed to replicate a broad range of analog circuits appropriate for signal processing. Programmable Memristor Analog Arrays (PMAA) provide high-performance signal processing functions and are free of the filter and LO-generated parasitic effects and related noise found in every heterodyne receiver.
{"title":"Analog Signal Processing in High Frequency Circuits Using Crossbar Configurations","authors":"Chaoyi He, Anil Korkmaz, Sam Palermo, R. S. Williams, L. Katehi","doi":"10.1109/comcas52219.2021.9629041","DOIUrl":"https://doi.org/10.1109/comcas52219.2021.9629041","url":null,"abstract":"A memristor is a nanoscale resistive switching device identified in 2009 [1], [4] as the fourth circuit element along with the resistor, the capacitor and the inductor. Since then, most of the research effort has focused on the design and fabrication of resistors to mitigate problems faced in todays computing circuits including Neumann’s bottleneck and the anticipated end of Moore’s Law. Memristors configured as node elements of a crossbar array circuit have demonstrated the capability to perform vector-matrix multiplications in one time step, regardless of the size of the vector-matrix pair [8]. Using the intrinsic memristor non-volatile resistance and the circuit properties of a cross-bar, this paper explores the use of a memristor cross-bar configuration in the analog domain. Specifically, the design and implementation of the memristor crossbar array concept in the design of a filter-mixer combination is demonstrated. In the proposed architecture, the memristor crossbar arrays can be programmed and re-programmed to replicate a broad range of analog circuits appropriate for signal processing. Programmable Memristor Analog Arrays (PMAA) provide high-performance signal processing functions and are free of the filter and LO-generated parasitic effects and related noise found in every heterodyne receiver.","PeriodicalId":354885,"journal":{"name":"2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130618256","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 : 2021-11-01DOI: 10.1109/comcas52219.2021.9629088
Kobi Ben Atar, E. Socher
This paper presents the design of a 204GHz power amplifier fabricated in TSMC 65nm CMOS process. The power amplifier employs 4 parallel chains of 8 gain stages with novel input and output series combining transformers. The 4:1 divider transformer at the input is driven in staggered anti-phase, which results in less than 2dB of insertion loss. The active stage layout has been modified to push the maximum oscillation frequency (fmax) by more than 50GHz. The power amplifier produces peak output power of 6.9dBm with 8.8dB of peak power gain at 204GHz, with a PAE of 1%. The active region occupies 0.17mm2 of die area.
{"title":"A 204 GHz Power Amplifier with 6.9dBm Psat and 8.8dB Gain in 65nm CMOS Technology","authors":"Kobi Ben Atar, E. Socher","doi":"10.1109/comcas52219.2021.9629088","DOIUrl":"https://doi.org/10.1109/comcas52219.2021.9629088","url":null,"abstract":"This paper presents the design of a 204GHz power amplifier fabricated in TSMC 65nm CMOS process. The power amplifier employs 4 parallel chains of 8 gain stages with novel input and output series combining transformers. The 4:1 divider transformer at the input is driven in staggered anti-phase, which results in less than 2dB of insertion loss. The active stage layout has been modified to push the maximum oscillation frequency (fmax) by more than 50GHz. The power amplifier produces peak output power of 6.9dBm with 8.8dB of peak power gain at 204GHz, with a PAE of 1%. The active region occupies 0.17mm2 of die area.","PeriodicalId":354885,"journal":{"name":"2021 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems (COMCAS)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124929145","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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