Pub Date : 2020-07-05DOI: 10.23919/USNC/URSI49741.2020.9321642
Nicolas C. Garcia, J. Chisum
In this article we propose the use of feed-element correction lenslets (FCL) in order to significantly reduce scan loss for wide-angle beam-scanning lens antennas. The FCL achieves this improved scan performance by squinting feed beams toward the center of the aperture lens to reduce spillover loss and can optionally predistort feed phase to correct for aperture phase distortions and improve beam quality. To demonstrate the concept we design and simulate a 4" fan-beam gradient-index (GRIN) lens antenna and unique GRIN FCLs for beam angles of 27° and 47°. The aperture lens and FCLs include broadband matching sections and exhibit approximately 50% aperture efficiency across the 26.5–40 GHz (WR28) band. We show that by using FCLs the gain at 47° is increased by 3.3 dB, corresponding to a scan loss exponent decrease from 3.0 to 2.0.
{"title":"Wide-angle Beam-scanning with Squinted Feed Elements","authors":"Nicolas C. Garcia, J. Chisum","doi":"10.23919/USNC/URSI49741.2020.9321642","DOIUrl":"https://doi.org/10.23919/USNC/URSI49741.2020.9321642","url":null,"abstract":"In this article we propose the use of feed-element correction lenslets (FCL) in order to significantly reduce scan loss for wide-angle beam-scanning lens antennas. The FCL achieves this improved scan performance by squinting feed beams toward the center of the aperture lens to reduce spillover loss and can optionally predistort feed phase to correct for aperture phase distortions and improve beam quality. To demonstrate the concept we design and simulate a 4\" fan-beam gradient-index (GRIN) lens antenna and unique GRIN FCLs for beam angles of 27° and 47°. The aperture lens and FCLs include broadband matching sections and exhibit approximately 50% aperture efficiency across the 26.5–40 GHz (WR28) band. We show that by using FCLs the gain at 47° is increased by 3.3 dB, corresponding to a scan loss exponent decrease from 3.0 to 2.0.","PeriodicalId":443426,"journal":{"name":"2020 IEEE USNC-CNC-URSI North American Radio Science Meeting (Joint with AP-S Symposium)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130572059","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 : 2020-07-05DOI: 10.23919/USNC/URSI49741.2020.9321669
Daniel Chen, Stavros Vakalis, Vaughn E. Holmes, J. Nanzer
We investigate the use of spatial frequency filtering to detect specific features and classify images without reconstructing a full image. Based on interferometric Fourier-domain imaging, filtering the spatial frequency information amounts to a data reduction at the input to the system, leading to lower computational complexity, less hardware requirements, and the ability to classify images without the need for full image reconstruction. The proposed application is the detection of man-made structures from interferometric microwave imagery of the ground. In the spatial frequency domain, man-made structures such as buildings and roads display discrete, high spatial-frequency signals, while natural scenes have a smoother spatial frequency profile. We present ring-shaped spatial frequency designs that can detect these features without full image reconstruction. Furthermore, the filters can potentially be implemented with a small set of antennas, leading to low-cost, fast classification imaging.
{"title":"Spatial Frequency Filter Design for Interferometric Image Classification Without Image Reconstruction","authors":"Daniel Chen, Stavros Vakalis, Vaughn E. Holmes, J. Nanzer","doi":"10.23919/USNC/URSI49741.2020.9321669","DOIUrl":"https://doi.org/10.23919/USNC/URSI49741.2020.9321669","url":null,"abstract":"We investigate the use of spatial frequency filtering to detect specific features and classify images without reconstructing a full image. Based on interferometric Fourier-domain imaging, filtering the spatial frequency information amounts to a data reduction at the input to the system, leading to lower computational complexity, less hardware requirements, and the ability to classify images without the need for full image reconstruction. The proposed application is the detection of man-made structures from interferometric microwave imagery of the ground. In the spatial frequency domain, man-made structures such as buildings and roads display discrete, high spatial-frequency signals, while natural scenes have a smoother spatial frequency profile. We present ring-shaped spatial frequency designs that can detect these features without full image reconstruction. Furthermore, the filters can potentially be implemented with a small set of antennas, leading to low-cost, fast classification imaging.","PeriodicalId":443426,"journal":{"name":"2020 IEEE USNC-CNC-URSI North American Radio Science Meeting (Joint with AP-S Symposium)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130458240","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 : 2020-07-05DOI: 10.23919/USNC/URSI49741.2020.9321643
Serge R. Mghabghab, J. Nanzer
We present an analysis on the required ranging accuracy for open-loop coherent distributed beamforming when wireless frequency synchronization is simultaneously implemented. In dynamic coherent networks, ranging is used to adjust the shifts in the phase of the transmitted signals by estimating the relative phase changes. The constraints on the desired ranging accuracy are increased in the case where wireless frequency transfer is implemented. We discuss a model for distributed beamforming and present analysis of the required ranging accuracy as a function of the relative beamforming gain, demonstrating that some angles exhibit significantly more ranging error tolerance than other angles.
{"title":"Ranging Requirements for Open-Loop Coherent Distributed Arrays With Wireless Frequency Synchronization","authors":"Serge R. Mghabghab, J. Nanzer","doi":"10.23919/USNC/URSI49741.2020.9321643","DOIUrl":"https://doi.org/10.23919/USNC/URSI49741.2020.9321643","url":null,"abstract":"We present an analysis on the required ranging accuracy for open-loop coherent distributed beamforming when wireless frequency synchronization is simultaneously implemented. In dynamic coherent networks, ranging is used to adjust the shifts in the phase of the transmitted signals by estimating the relative phase changes. The constraints on the desired ranging accuracy are increased in the case where wireless frequency transfer is implemented. We discuss a model for distributed beamforming and present analysis of the required ranging accuracy as a function of the relative beamforming gain, demonstrating that some angles exhibit significantly more ranging error tolerance than other angles.","PeriodicalId":443426,"journal":{"name":"2020 IEEE USNC-CNC-URSI North American Radio Science Meeting (Joint with AP-S Symposium)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122750231","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 : 2020-07-05DOI: 10.23919/USNC/URSI49741.2020.9321665
D. Klyuev, A. Neshcheret, O. Osipov, S. Skulkin
The paper shows the possibility of increasing the bandwidth in MIMO systems by using antennas based on biisotropic and bianisotropic chiral metamaterials. It is shown that the use of different configurations of metamaterials has different effects on the characteristics of MIMO systems.
{"title":"Antennas based on biisotropic and bianisotropic chiral metamaterials for MIMO systems","authors":"D. Klyuev, A. Neshcheret, O. Osipov, S. Skulkin","doi":"10.23919/USNC/URSI49741.2020.9321665","DOIUrl":"https://doi.org/10.23919/USNC/URSI49741.2020.9321665","url":null,"abstract":"The paper shows the possibility of increasing the bandwidth in MIMO systems by using antennas based on biisotropic and bianisotropic chiral metamaterials. It is shown that the use of different configurations of metamaterials has different effects on the characteristics of MIMO systems.","PeriodicalId":443426,"journal":{"name":"2020 IEEE USNC-CNC-URSI North American Radio Science Meeting (Joint with AP-S Symposium)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125054627","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 low-profile RF wire-to-board connector design for 5G mobile communications and WiGig applications is presented in this paper. A new connector structure with a mating height of only 0.7mm to achieve a bandwidth from DC up to 70GHz is proposed. This RF connector design may provide jump wire connections in devices for 5G wireless communications and other millimeter wave systems.
{"title":"A Low-Profile RF Wire-to-Board Connector Design for Millimeter Wave Applications","authors":"Yu-Cheng Huang, Chen-Pang Chao, Ming‐Jie Gao, Yi-Wen Chiu, Chang-Fa Yang, Shih-Chieh Chen, Jaisy Kung, George Wei","doi":"10.23919/USNC/URSI49741.2020.9321653","DOIUrl":"https://doi.org/10.23919/USNC/URSI49741.2020.9321653","url":null,"abstract":"A low-profile RF wire-to-board connector design for 5G mobile communications and WiGig applications is presented in this paper. A new connector structure with a mating height of only 0.7mm to achieve a bandwidth from DC up to 70GHz is proposed. This RF connector design may provide jump wire connections in devices for 5G wireless communications and other millimeter wave systems.","PeriodicalId":443426,"journal":{"name":"2020 IEEE USNC-CNC-URSI North American Radio Science Meeting (Joint with AP-S Symposium)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125100259","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 : 2020-07-05DOI: 10.23919/USNC/URSI49741.2020.9321635
Yin-Cheng Chang, Ta-Yeh Lin, Shuw-Guann Lin, Chaoping Hsieh, D. Chang
The IC stripline, an IEC radiated electromagnetic susceptibility (EMS) method, is utilized for evaluating the injection pulling and locking effects of the voltage-controlled oscillator (VCO). An IC stripline with the bandwidth of 2.5 GHz is realized and the test setup is built. A commercial VCO is tested for demonstration. Another IEC conducted EMS test, direct power injection, is also performed for comparison. The results show the effectiveness of characterizing injection pulling and locking of VCO by using the proposed solution.
{"title":"Evaluation of Injection Pulling/Locking of VCO by Using IEC Electromagnetic Susceptibility Tests","authors":"Yin-Cheng Chang, Ta-Yeh Lin, Shuw-Guann Lin, Chaoping Hsieh, D. Chang","doi":"10.23919/USNC/URSI49741.2020.9321635","DOIUrl":"https://doi.org/10.23919/USNC/URSI49741.2020.9321635","url":null,"abstract":"The IC stripline, an IEC radiated electromagnetic susceptibility (EMS) method, is utilized for evaluating the injection pulling and locking effects of the voltage-controlled oscillator (VCO). An IC stripline with the bandwidth of 2.5 GHz is realized and the test setup is built. A commercial VCO is tested for demonstration. Another IEC conducted EMS test, direct power injection, is also performed for comparison. The results show the effectiveness of characterizing injection pulling and locking of VCO by using the proposed solution.","PeriodicalId":443426,"journal":{"name":"2020 IEEE USNC-CNC-URSI North American Radio Science Meeting (Joint with AP-S Symposium)","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133898494","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 : 2020-07-05DOI: 10.23919/USNC/URSI49741.2020.9321683
Koki Kawauchi, Etsushi Oda, T. Hamasaki
In this paper, the low-latitude maritime mobile radio propagation measurement and model are demonstrated over a distance of 42 km. The specific feature of this scenario is using a novel high-sensitivity communication system (Received Signal Strength Indication: RSSI -142 dBm typical) with a low power 20 mW 920 MHz transmitter. In addition, comparing the LOS (Line of Sight) propagation and the NLOS (Non-LOS) propagation for a small hill island, it was clarified that there is no significant difference between RSSI and distance due to diffraction and scattering in an atmospheric duct.
本文在42公里的距离上对低纬度海上移动无线电传播测量和模型进行了验证。该方案的具体特点是使用一种新颖的高灵敏度通信系统(接收信号强度指示:RSSI -142 dBm典型)与低功率20 mW 920 MHz发射机。此外，比较了一个小山丘岛的LOS (Line of Sight)传播和NLOS (Non-LOS)传播，澄清了由于大气导管中衍射和散射的影响，RSSI与距离之间没有显著差异。
{"title":"Long Distance Propagation Characteristics on the Sea Using a 20 mW 920 MHz Wireless System","authors":"Koki Kawauchi, Etsushi Oda, T. Hamasaki","doi":"10.23919/USNC/URSI49741.2020.9321683","DOIUrl":"https://doi.org/10.23919/USNC/URSI49741.2020.9321683","url":null,"abstract":"In this paper, the low-latitude maritime mobile radio propagation measurement and model are demonstrated over a distance of 42 km. The specific feature of this scenario is using a novel high-sensitivity communication system (Received Signal Strength Indication: RSSI -142 dBm typical) with a low power 20 mW 920 MHz transmitter. In addition, comparing the LOS (Line of Sight) propagation and the NLOS (Non-LOS) propagation for a small hill island, it was clarified that there is no significant difference between RSSI and distance due to diffraction and scattering in an atmospheric duct.","PeriodicalId":443426,"journal":{"name":"2020 IEEE USNC-CNC-URSI North American Radio Science Meeting (Joint with AP-S Symposium)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115485455","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 : 2020-07-05DOI: 10.23919/USNC/URSI49741.2020.9321608
C. Haedrich, D. Breton
In previous work, we have observed significant variability in radio-frequency (RF) noise within neighborhoods of Boston, MA, USA [1]. Furthermore, the sources of this man-made RF noise appear to be point-like in nature [2]. However, there are no descriptions in the literature describing the relationship between the spatial pattern of sources within a neighborhood and the distribution of measured noise powers in the same area. Therefore, we developed a simple model with completely spatially random (CSR) point sources and compared the modeled results with our measurements from Boston. Our results show that, at the frequency studied, a simple CSR model effectively captures the heavy-tailed behavior present in our measurements. A source density of 280 sources per km2, a mean source power of 1 μW and a standard deviation of 7 dB are a reasonable match to the observed distribution in Boston, MA, USA.
{"title":"Modeling RF Noise in Urban Environments with Spatially Distributed Point Sources","authors":"C. Haedrich, D. Breton","doi":"10.23919/USNC/URSI49741.2020.9321608","DOIUrl":"https://doi.org/10.23919/USNC/URSI49741.2020.9321608","url":null,"abstract":"In previous work, we have observed significant variability in radio-frequency (RF) noise within neighborhoods of Boston, MA, USA [1]. Furthermore, the sources of this man-made RF noise appear to be point-like in nature [2]. However, there are no descriptions in the literature describing the relationship between the spatial pattern of sources within a neighborhood and the distribution of measured noise powers in the same area. Therefore, we developed a simple model with completely spatially random (CSR) point sources and compared the modeled results with our measurements from Boston. Our results show that, at the frequency studied, a simple CSR model effectively captures the heavy-tailed behavior present in our measurements. A source density of 280 sources per km2, a mean source power of 1 μW and a standard deviation of 7 dB are a reasonable match to the observed distribution in Boston, MA, USA.","PeriodicalId":443426,"journal":{"name":"2020 IEEE USNC-CNC-URSI North American Radio Science Meeting (Joint with AP-S Symposium)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115514375","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 : 2020-07-05DOI: 10.23919/USNC/URSI49741.2020.9321617
J. Claverie, Dorra Boukari
Ducting is a major phenomenon that affects the radar systems operating above the sea surface. The refractivity profiles derived from bulk models can be approximated by analytical expressions whose precision must be analyzed. We examine here a quite new published expression and show that, in terms of radar propagation, it gives very similar results to those obtained with the complete bulk profiles (The computed propagation factors generally differs by only a few tenths of dB).
{"title":"Analytical formulation of the vertical refractivity profiles associated to evaporation ducts","authors":"J. Claverie, Dorra Boukari","doi":"10.23919/USNC/URSI49741.2020.9321617","DOIUrl":"https://doi.org/10.23919/USNC/URSI49741.2020.9321617","url":null,"abstract":"Ducting is a major phenomenon that affects the radar systems operating above the sea surface. The refractivity profiles derived from bulk models can be approximated by analytical expressions whose precision must be analyzed. We examine here a quite new published expression and show that, in terms of radar propagation, it gives very similar results to those obtained with the complete bulk profiles (The computed propagation factors generally differs by only a few tenths of dB).","PeriodicalId":443426,"journal":{"name":"2020 IEEE USNC-CNC-URSI North American Radio Science Meeting (Joint with AP-S Symposium)","volume":"212 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117313799","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 : 2020-07-05DOI: 10.23919/USNC/URSI49741.2020.9321615
Xenofon Konstantinou, M. Craton, Cristian J. Herrera-Rodriguez, A. Hardy, J. Albrecht, T. Grotjohn, J. Papapolymerou
This paper demonstrates the design, fabrication, and RF testing of a monolithic lowpass filter (LPF) on single-crystalline diamond (SCD). This is the first time an RF filter has been fabricated on SCD. The LPF consists of grounded coplanar waveguide (GCPW) and microstrip (MS) transmission lines, via-less GCPW-to-MS transitions, and a bottom ground plane, all printed on a 5 mm × 5 mm × 0.15 mm SCD wafer with Aerosol Jet Printing technology using silver ink. The LPF is a stepped-impedance filter designed to have a cutoff frequency of 40 GHz and was measured from 10 MHz up to 67 GHz. Our results indicate that SCD is a good platform for the realization of high-frequency RF structures on a single substrate using additive manufacturing techniques.
{"title":"A Monolithic RF Lowpass Filter on Diamond via Additive Manufacturing","authors":"Xenofon Konstantinou, M. Craton, Cristian J. Herrera-Rodriguez, A. Hardy, J. Albrecht, T. Grotjohn, J. Papapolymerou","doi":"10.23919/USNC/URSI49741.2020.9321615","DOIUrl":"https://doi.org/10.23919/USNC/URSI49741.2020.9321615","url":null,"abstract":"This paper demonstrates the design, fabrication, and RF testing of a monolithic lowpass filter (LPF) on single-crystalline diamond (SCD). This is the first time an RF filter has been fabricated on SCD. The LPF consists of grounded coplanar waveguide (GCPW) and microstrip (MS) transmission lines, via-less GCPW-to-MS transitions, and a bottom ground plane, all printed on a 5 mm × 5 mm × 0.15 mm SCD wafer with Aerosol Jet Printing technology using silver ink. The LPF is a stepped-impedance filter designed to have a cutoff frequency of 40 GHz and was measured from 10 MHz up to 67 GHz. Our results indicate that SCD is a good platform for the realization of high-frequency RF structures on a single substrate using additive manufacturing techniques.","PeriodicalId":443426,"journal":{"name":"2020 IEEE USNC-CNC-URSI North American Radio Science Meeting (Joint with AP-S Symposium)","volume":"61 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124234235","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：