Pub Date : 2019-04-01DOI: 10.1109/WAMICON.2019.8765460
D. Jiao
The fast and large-scale design automation of next-generation IC, packages, and boards calls for a continuous reduction of the computational complexity of electromagnetic solvers. In general, to solve problems with N parameters, the optimal computational complexity is linear complexity O(N). State-of-the-art fast computational methods rely on iterative matrix solutions to solve large-scale problems. The optimal complexity of an iterative solver is O(NN it N rhs ) with N being matrix size, N it the number of iterations and N rhs the number of right-hand sides. How to invert or factorize a dense matrix or a sparse matrix of size N in O(N) (optimal) complexity has been a challenging research problem, but of critical importance to the continual advancement of computational electromagnetics and electronic design automation. In this talk, I will present recent progresses in developing both direct finite element solvers and integral equation-based solvers of optimal complexity for fast and large-scale electromagnetics-based analysis and design of integrated circuits and systems.
下一代集成电路、封装和电路板的快速和大规模设计自动化要求不断降低电磁求解器的计算复杂性。一般情况下，对于有N个参数的问题，最优计算复杂度为线性复杂度O(N)。最先进的快速计算方法依赖于迭代矩阵解来解决大规模问题。迭代求解器的最优复杂度为0 (NN it N rhs)，其中N为矩阵大小，N为迭代次数，N rhs为右侧个数。如何以O(N)(最优)复杂度反演或分解大小为N的密集矩阵或稀疏矩阵一直是一个具有挑战性的研究问题，但对计算电磁学和电子设计自动化的持续发展至关重要。在这次演讲中，我将介绍在开发用于快速和大规模基于电磁的集成电路和系统分析和设计的最优复杂性的直接有限元求解器和基于积分方程的求解器方面的最新进展。
{"title":"Next-generation fast algorithms for electromagnetics-based design and analysis of high-performance integrated circuits, packages, and boards","authors":"D. Jiao","doi":"10.1109/WAMICON.2019.8765460","DOIUrl":"https://doi.org/10.1109/WAMICON.2019.8765460","url":null,"abstract":"The fast and large-scale design automation of next-generation IC, packages, and boards calls for a continuous reduction of the computational complexity of electromagnetic solvers. In general, to solve problems with N parameters, the optimal computational complexity is linear complexity O(N). State-of-the-art fast computational methods rely on iterative matrix solutions to solve large-scale problems. The optimal complexity of an iterative solver is O(NN it N rhs ) with N being matrix size, N it the number of iterations and N rhs the number of right-hand sides. How to invert or factorize a dense matrix or a sparse matrix of size N in O(N) (optimal) complexity has been a challenging research problem, but of critical importance to the continual advancement of computational electromagnetics and electronic design automation. In this talk, I will present recent progresses in developing both direct finite element solvers and integral equation-based solvers of optimal complexity for fast and large-scale electromagnetics-based analysis and design of integrated circuits and systems.","PeriodicalId":328717,"journal":{"name":"2019 IEEE 20th Wireless and Microwave Technology Conference (WAMICON)","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114495390","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 : 2019-04-01DOI: 10.1109/WAMICON.2019.8765451
J. Mcdaniel
This paper presents a series of guidelines to transition ground backed coplanar waveguide (GBCPWG) from the design phase to finite-element-method (FEM) electromagnetic simulations. A two step process is discussed including a design to circuit simulation and circuit to electromagnetic simulation. The majority of the paper focuses on the differences between circuit simulations and FEM simulations including port definition, side ground placement, and excitation of higher order modes. Careful consideration of these topics are crucial to achieve ideal performance over wide bandwidths, but also develop accurate simulation models. A DC-20 GHz CPWG transmission line is used as a design example throughout this paper.
{"title":"Simulation Guidelines for Wideband Ground Backed Coplanar Waveguide Transmission Lines","authors":"J. Mcdaniel","doi":"10.1109/WAMICON.2019.8765451","DOIUrl":"https://doi.org/10.1109/WAMICON.2019.8765451","url":null,"abstract":"This paper presents a series of guidelines to transition ground backed coplanar waveguide (GBCPWG) from the design phase to finite-element-method (FEM) electromagnetic simulations. A two step process is discussed including a design to circuit simulation and circuit to electromagnetic simulation. The majority of the paper focuses on the differences between circuit simulations and FEM simulations including port definition, side ground placement, and excitation of higher order modes. Careful consideration of these topics are crucial to achieve ideal performance over wide bandwidths, but also develop accurate simulation models. A DC-20 GHz CPWG transmission line is used as a design example throughout this paper.","PeriodicalId":328717,"journal":{"name":"2019 IEEE 20th Wireless and Microwave Technology Conference (WAMICON)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128582352","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 : 2019-04-01DOI: 10.1109/WAMICON.2019.8765441
Xiaomeng Gao, Xiaonan Jiang, Songjie Bi, D. Matthews, S. Schaefer, X. Liu
Contact-based cardiac motion detection using Quadrature Doppler radar faces a challenge of the I/Q-formed non-arc constellation. In this work, a hypothesis is brought forward that such complicated constellation originates from not one, but two moving targets. The dual-motion model may very well explain that contact-based Doppler radar detects both atrium and ventricle motions during cardiac cycles. In this work, dual-motion simulation and phantom measurements are presented, verifying that the atrial-ventricular motions are the reason that I/Q baseband signals transcribe a complex non-arc constellation. It offers the first evidence that contact-based Doppler radar measures actual heart motion.
{"title":"Measurement of the Complex Human Atrial-Ventricular Motions using Contact-Based Doppler Radar","authors":"Xiaomeng Gao, Xiaonan Jiang, Songjie Bi, D. Matthews, S. Schaefer, X. Liu","doi":"10.1109/WAMICON.2019.8765441","DOIUrl":"https://doi.org/10.1109/WAMICON.2019.8765441","url":null,"abstract":"Contact-based cardiac motion detection using Quadrature Doppler radar faces a challenge of the I/Q-formed non-arc constellation. In this work, a hypothesis is brought forward that such complicated constellation originates from not one, but two moving targets. The dual-motion model may very well explain that contact-based Doppler radar detects both atrium and ventricle motions during cardiac cycles. In this work, dual-motion simulation and phantom measurements are presented, verifying that the atrial-ventricular motions are the reason that I/Q baseband signals transcribe a complex non-arc constellation. It offers the first evidence that contact-based Doppler radar measures actual heart motion.","PeriodicalId":328717,"journal":{"name":"2019 IEEE 20th Wireless and Microwave Technology Conference (WAMICON)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121005401","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 : 2019-04-01DOI: 10.1109/WAMICON.2019.8765431
Oday Bshara, Yuqiao Liu, K. Dandekar
Unmanned aerial vehicles (UAVs) are being used for civil, industrial, and military purposes. However, UAVs can pose threats when they leave their restricted routes or when they fly without permission. The proliferation of UAVs along with their potential threats raise the need for the development of detection and tracking systems for flying UAVs in predefined flying zones. Characterizing the radar cross section (RCS) signature of UAVs is crucial for the development of such systems. This paper measures angular monostatic RCS using vector network analyzer (VNA) S parameters to characterize a UAV based on its electromagnetic backscattering for both cases of stationary and rotating propellers at different speeds. Measurements were performed in an anechoic chamber and in a lab environment at 5 GHz and 60 GHz center frequencies, respectively.
{"title":"Radar Cross Section Measurement Comparison of UAVs at C-band and V-band","authors":"Oday Bshara, Yuqiao Liu, K. Dandekar","doi":"10.1109/WAMICON.2019.8765431","DOIUrl":"https://doi.org/10.1109/WAMICON.2019.8765431","url":null,"abstract":"Unmanned aerial vehicles (UAVs) are being used for civil, industrial, and military purposes. However, UAVs can pose threats when they leave their restricted routes or when they fly without permission. The proliferation of UAVs along with their potential threats raise the need for the development of detection and tracking systems for flying UAVs in predefined flying zones. Characterizing the radar cross section (RCS) signature of UAVs is crucial for the development of such systems. This paper measures angular monostatic RCS using vector network analyzer (VNA) S parameters to characterize a UAV based on its electromagnetic backscattering for both cases of stationary and rotating propellers at different speeds. Measurements were performed in an anechoic chamber and in a lab environment at 5 GHz and 60 GHz center frequencies, respectively.","PeriodicalId":328717,"journal":{"name":"2019 IEEE 20th Wireless and Microwave Technology Conference (WAMICON)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121276719","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 : 2019-04-01DOI: 10.1109/WAMICON.2019.8765467
J. Pavia, M. Ribeiro, C. K. Sarikaya, D. Akbar, H. Altan, N. Souto
In this paper, we propose a study on the characterization, design and simulation of a THz sensor for applications in Structural Health Monitoring (SHM). The proposed sensor is assembled using two frequency selective surfaces (FSSs) based on metamaterial wire resonators. We present a theoretical model to describe its electromagnetics which is used not only to understand the physical principles underlying the functioning of the sensor but also to determine a set of optimized parameters for its operation in the THz window from 395 GHz to 455 GHz. We present our numerical simulations, involving both electromagnetic and mechanical simulation techniques, to determine the reflectance profile of the sensor as a function of applied force. In this study we considered the possibility of using two thermoplastic polymers as host materials: High-Density PolyEthylene (HDPE) and PolyTetraFluoroEthylene (PTFE). The two sensors have a good dynamic range and comparable characteristics. However, we found that with HDPE it is possible to construct a sensor with a more linear response, although not as sensitive as in the case of PTFE. With HDPE we are able to pass from a situation of full transparency to almost full opacity using only its linear operating zone.
{"title":"Design of a Novel THz Sensor for Structural Health Monitoring Applications","authors":"J. Pavia, M. Ribeiro, C. K. Sarikaya, D. Akbar, H. Altan, N. Souto","doi":"10.1109/WAMICON.2019.8765467","DOIUrl":"https://doi.org/10.1109/WAMICON.2019.8765467","url":null,"abstract":"In this paper, we propose a study on the characterization, design and simulation of a THz sensor for applications in Structural Health Monitoring (SHM). The proposed sensor is assembled using two frequency selective surfaces (FSSs) based on metamaterial wire resonators. We present a theoretical model to describe its electromagnetics which is used not only to understand the physical principles underlying the functioning of the sensor but also to determine a set of optimized parameters for its operation in the THz window from 395 GHz to 455 GHz. We present our numerical simulations, involving both electromagnetic and mechanical simulation techniques, to determine the reflectance profile of the sensor as a function of applied force. In this study we considered the possibility of using two thermoplastic polymers as host materials: High-Density PolyEthylene (HDPE) and PolyTetraFluoroEthylene (PTFE). The two sensors have a good dynamic range and comparable characteristics. However, we found that with HDPE it is possible to construct a sensor with a more linear response, although not as sensitive as in the case of PTFE. With HDPE we are able to pass from a situation of full transparency to almost full opacity using only its linear operating zone.","PeriodicalId":328717,"journal":{"name":"2019 IEEE 20th Wireless and Microwave Technology Conference (WAMICON)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122744844","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 : 2019-04-01DOI: 10.1109/WAMICON.2019.8765455
Popp Daniel, G. Fischer
This paper introduces an enhanced combiner architecture for high power and high bandwidth Three-Way Doherty Power Amplifier. The combiner is mathematical analyzed and two antithetic digital driven Doherty amplifiers are designed. The first one aims for high Back-off efficiency across the target bandwidth while the second one was designed for direct load matching. Both Doherty amplifiers feature a peak power of 61 dBm. The challenges for designing amplifiers with such high peak power are the absorption of the large transistor parasitics and matching the low impedance environment to the load. The proposed combiner architecture features transformer offset lines at all amplifier cores allowing the cancellation of parasitics as well as optimization for broadband performance. The first Doherty amplifier uses a broadband multi-step transformer for load matching and features high Back-off efficiency across the target bandwidth. It achieves a fractional bandwidth of 36.4% and a peak output power of 61dBm with a power ripple less than 1 dB. The combiner of the second Doherty amplifier transforms the low impedance environment to the desired load termination. It is able to meet the design goals across the frequency band and even covers a broad region outside the band. It has a fractional bandwidth of 43.5% and a peak output power of 61dBm with a power ripple less than 1 dB. Both Doherty amplifiers are using 500W GaN HEMT transistors from Wolfspeed. The designs and simulations are done with the corresponding Wolfspeed non-linear model.
介绍了一种用于大功率、高带宽三向多尔蒂功率放大器的增强型组合器结构。对该合成器进行了数学分析，设计了两个对偶数字驱动的多尔蒂放大器。第一个目标是在目标带宽上实现高退退效率，而第二个目标是为了直接负载匹配而设计的。两款多尔蒂放大器的峰值功率均为61 dBm。设计具有如此高峰值功率的放大器所面临的挑战是如何吸收大晶体管寄生效应，以及如何将低阻抗环境与负载相匹配。所提出的组合器架构在所有放大器核心处都具有变压器偏置线，允许消除寄生并优化宽带性能。第一款多尔蒂放大器使用宽带多步变压器进行负载匹配，并在整个目标带宽上具有高回退效率。它的分数带宽为36.4%，峰值输出功率为61dBm，功率纹波小于1db。第二个多尔蒂放大器的合成器将低阻抗环境转换为所需的负载终止。它在整个频带都能满足设计目标，甚至在频带外也能覆盖很宽的区域。它的分数带宽为43.5%，峰值输出功率为61dBm，功率纹波小于1db。两个多尔蒂放大器都使用Wolfspeed的500W GaN HEMT晶体管。采用Wolfspeed非线性模型进行了设计和仿真。
{"title":"High Power and High Bandwidth Digital Three-Way Doherty Power Amplifier","authors":"Popp Daniel, G. Fischer","doi":"10.1109/WAMICON.2019.8765455","DOIUrl":"https://doi.org/10.1109/WAMICON.2019.8765455","url":null,"abstract":"This paper introduces an enhanced combiner architecture for high power and high bandwidth Three-Way Doherty Power Amplifier. The combiner is mathematical analyzed and two antithetic digital driven Doherty amplifiers are designed. The first one aims for high Back-off efficiency across the target bandwidth while the second one was designed for direct load matching. Both Doherty amplifiers feature a peak power of 61 dBm. The challenges for designing amplifiers with such high peak power are the absorption of the large transistor parasitics and matching the low impedance environment to the load. The proposed combiner architecture features transformer offset lines at all amplifier cores allowing the cancellation of parasitics as well as optimization for broadband performance. The first Doherty amplifier uses a broadband multi-step transformer for load matching and features high Back-off efficiency across the target bandwidth. It achieves a fractional bandwidth of 36.4% and a peak output power of 61dBm with a power ripple less than 1 dB. The combiner of the second Doherty amplifier transforms the low impedance environment to the desired load termination. It is able to meet the design goals across the frequency band and even covers a broad region outside the band. It has a fractional bandwidth of 43.5% and a peak output power of 61dBm with a power ripple less than 1 dB. Both Doherty amplifiers are using 500W GaN HEMT transistors from Wolfspeed. The designs and simulations are done with the corresponding Wolfspeed non-linear model.","PeriodicalId":328717,"journal":{"name":"2019 IEEE 20th Wireless and Microwave Technology Conference (WAMICON)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114186524","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 : 2019-04-01DOI: 10.1109/WAMICON.2019.8765469
Robin Chataut, R. Akl, U. K. Dey
Massive multiple-input multiple-output (MIMO) is a core component of next-generation 5G networks which groups together antennas at both transmitter and the receiver to provide high spectral and energy efficiency. However, uplink signal detection in massive MIMO system becomes inefficient and computationally complex with a larger number of antennas. In this paper, we propose an algorithm for the uplink detection based upon least square regressor selection problem. The results through simulations show that the proposed algorithm is computationally efficient and achieves near-optimal bit error rate (BER) performance in comparison to the conventional uplink detection algorithms. The proposed algorithm can provide a good tradeoff between BER and computational complexity and is suitable for uplink detection in massive MIMO systems.
{"title":"Least Square Regressor Selection Based Detection for Uplink 5G Massive MIMO Systems","authors":"Robin Chataut, R. Akl, U. K. Dey","doi":"10.1109/WAMICON.2019.8765469","DOIUrl":"https://doi.org/10.1109/WAMICON.2019.8765469","url":null,"abstract":"Massive multiple-input multiple-output (MIMO) is a core component of next-generation 5G networks which groups together antennas at both transmitter and the receiver to provide high spectral and energy efficiency. However, uplink signal detection in massive MIMO system becomes inefficient and computationally complex with a larger number of antennas. In this paper, we propose an algorithm for the uplink detection based upon least square regressor selection problem. The results through simulations show that the proposed algorithm is computationally efficient and achieves near-optimal bit error rate (BER) performance in comparison to the conventional uplink detection algorithms. The proposed algorithm can provide a good tradeoff between BER and computational complexity and is suitable for uplink detection in massive MIMO systems.","PeriodicalId":328717,"journal":{"name":"2019 IEEE 20th Wireless and Microwave Technology Conference (WAMICON)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128487152","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 : 2019-04-01DOI: 10.1109/WAMICON.2019.8765450
Z. V. Missen, A. Semnani, D. Peroulis
A novel circuit design for a wideband high-power limiter is presented. A two-stage topology is utilized to cascade a coplanar waveguide transmission line symmetrically loaded with shunt gas discharge tubes (self-contained plasma cell devices) and a commercial RF MEMS switch. An initial-stage integration of the design is fabricated and measured, and test results are presented. A maximum insertion loss of 0.5 dB, a return loss better than 14.5 dB, and a limiting isolation greater than 24 dB are measured over a 1–3 GHz frequency bandwidth. Relaxation and response time measurements are on the order of microseconds. The direction of further developments to the proposed design is also discussed.
{"title":"Toward a High-Power High-Isolation Wideband Plasma Limiter","authors":"Z. V. Missen, A. Semnani, D. Peroulis","doi":"10.1109/WAMICON.2019.8765450","DOIUrl":"https://doi.org/10.1109/WAMICON.2019.8765450","url":null,"abstract":"A novel circuit design for a wideband high-power limiter is presented. A two-stage topology is utilized to cascade a coplanar waveguide transmission line symmetrically loaded with shunt gas discharge tubes (self-contained plasma cell devices) and a commercial RF MEMS switch. An initial-stage integration of the design is fabricated and measured, and test results are presented. A maximum insertion loss of 0.5 dB, a return loss better than 14.5 dB, and a limiting isolation greater than 24 dB are measured over a 1–3 GHz frequency bandwidth. Relaxation and response time measurements are on the order of microseconds. The direction of further developments to the proposed design is also discussed.","PeriodicalId":328717,"journal":{"name":"2019 IEEE 20th Wireless and Microwave Technology Conference (WAMICON)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123740443","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 : 2019-04-01DOI: 10.1109/WAMICON.2019.8765457
Nawaf R. Almuqati, H. Sigmarsson
In this paper, a new microstrip three-dimensional taper is presented. This new taper enables circuit-in-substrate (CIS) integration of high-quality microwave components with a microstrip line designed on a thick, ultra-low dielectric constant substrate. The width of microstrip lines on thick low dielectric constant materials is considerably large and can create a shunt capacitive loading when using edge mount connectors. The microstrip line can be tapered in the planar direction to reduce the shunt capacitance at the cost of added mismatch. The proposed technique adds a vertical tapering of the substrate, which results in a constant impedance across the substrate and reduces the mismatch between the microstrip and the connector. For verification, the 3D microstrip line taper is fabricated and measured. Full-wave simulation results and measurements are compared to validate the proposed design.
{"title":"3D Microstrip Line Taper on Ultra-low Dielectric Constant Substrate","authors":"Nawaf R. Almuqati, H. Sigmarsson","doi":"10.1109/WAMICON.2019.8765457","DOIUrl":"https://doi.org/10.1109/WAMICON.2019.8765457","url":null,"abstract":"In this paper, a new microstrip three-dimensional taper is presented. This new taper enables circuit-in-substrate (CIS) integration of high-quality microwave components with a microstrip line designed on a thick, ultra-low dielectric constant substrate. The width of microstrip lines on thick low dielectric constant materials is considerably large and can create a shunt capacitive loading when using edge mount connectors. The microstrip line can be tapered in the planar direction to reduce the shunt capacitance at the cost of added mismatch. The proposed technique adds a vertical tapering of the substrate, which results in a constant impedance across the substrate and reduces the mismatch between the microstrip and the connector. For verification, the 3D microstrip line taper is fabricated and measured. Full-wave simulation results and measurements are compared to validate the proposed design.","PeriodicalId":328717,"journal":{"name":"2019 IEEE 20th Wireless and Microwave Technology Conference (WAMICON)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128645906","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 : 2019-04-01DOI: 10.1109/WAMICON.2019.8765447
M. Knox
Passive and active cancellation of self-interference (SI) and cross-interference (CI) is examined in an In-Band Full Duplex (IBFD) 2×2 MIMO transceiver. For our system, passive cancellation of the SI and CI is achieved using a combination of a balanced feed network connected to a circularly polarized antenna and a feedforward path connecting the two transceivers. Active cancellation is achieved using a tapped delay line network in a configuration that greatly reduces circuit complexity when compared to other reported systems. Over-the-air measurements of an indoor environment are combined with measured and simulated tapped delay line networks to achieve a total SI cancellation and CI cancellation of 60 dB over 20 MHz.
{"title":"Simplified Tapped Delay Line Architecture for Active Cancellation in a 2×2 IBFD MIMO Transceiver","authors":"M. Knox","doi":"10.1109/WAMICON.2019.8765447","DOIUrl":"https://doi.org/10.1109/WAMICON.2019.8765447","url":null,"abstract":"Passive and active cancellation of self-interference (SI) and cross-interference (CI) is examined in an In-Band Full Duplex (IBFD) 2×2 MIMO transceiver. For our system, passive cancellation of the SI and CI is achieved using a combination of a balanced feed network connected to a circularly polarized antenna and a feedforward path connecting the two transceivers. Active cancellation is achieved using a tapped delay line network in a configuration that greatly reduces circuit complexity when compared to other reported systems. Over-the-air measurements of an indoor environment are combined with measured and simulated tapped delay line networks to achieve a total SI cancellation and CI cancellation of 60 dB over 20 MHz.","PeriodicalId":328717,"journal":{"name":"2019 IEEE 20th Wireless and Microwave Technology Conference (WAMICON)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126808298","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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