High Q Tunable Filters
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High Q Tunable Filters
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Author : Fengxi Huang
language : en
Publisher:
Release Date : 2012
High Q Tunable Filters written by Fengxi Huang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Microwave tunable filters are key components in radar, satellite, wireless, and various dynamic communication systems. Compared to a traditional filter, a tunable filter is able to dynamically pass the required signal and suppress the interference from adjacent channels. In reconfigurable systems, tunable filters are able to adapt to dynamic frequency selection and spectrum access. They can also adapt to bandwidth variations to maximize data transmission, and can minimize interferences from or to other users. Tunable filters can be also used to reduce size and cost in multi-band receivers replacing filter banks. However, the tunable filter often suffers limited application due to its relatively low Q, noticeable return loss degradation, and bandwidth changing during the filter tuning. The research objectives of this thesis are to investigate the feasibility of designing high Q tunable filters based on dielectric resonators (DR) and coaxial resonators. Various structures and tuning methods that yield relatively high unloaded Q tunable filters are explored and developed. Furthermore, the method of designing high Q tunable filters with a constant bandwidth and less degradation during the tuning process has been also investigated. A series of novel structures of dielectric resonators have been proposed to realize in a high Q miniature tunable filters. The first type of TME mode DR filter is designed to be tuned by piezoelectric bending actuators outside the cavity, and has achieved a tuning range from 4.97 to 5.22 GHz and unloaded Q better than 536 over the tuning range. The second type of TME mode tunable filters are integrated with various tuning elements: GaAs varactors, MEMS switches, and MEMS capacitor banks are employed. The designed filter with MEMS switches operates at 4.72 GHz, and has achieved a tuning ratio of 3.5% with Q better than 510 over the tuning range. The designed filter with GaAs varactors operates at 4.92 GHz, and has achieved a tuning ratio of 2% with Q better than 170 over the tuning range. Finally, the designed filter with MEMS capacitor bank operates at 5.11 GHz, delivering a tuning ratio of 3.5% with Q better than 530 over the tuning range. Cavity combline/coaxial resonators are also used in the design of high Q tunable filters. This thesis presents a novel approach to design a tunable cavity combline filter tuned by a MEMS switched capacitor bank. Instead of mechanically moving the tuning disk, the cavity combline filter is tuned with capacitances loading on the tuning disks, which are electrically adjusted by MEMS switched capacitor bank. The assembled 2-pole filter operates at 2.5 GHz with a bandwidth of 22 MHz, a tuning range of 110 MHz and a Q better than 374 over the tuning range. The assembled 6-pole filter operates at 2.6 GHz with a bandwidth of 30 MHz and has a tuning range of 44 MHz. Finally, the design of high Q tunable filter with constant bandwidth is explored. A 4-pole high Q cavity combline tunable filter with constant bandwidth is demonstrated. The tuning has been realized manually and by using a piezoelectric motor respectively. The designed filter operates at 2.45 GHz and has achieved a stable bandwidth of 30 ±1.1 MHz over a tuning range of 400 MHz and an unloaded Q better than 3000. This design method for a constant bandwidth filter is applicable to both cavity combline filters and dielectric resonator filters.
Microwave Filters For Communication Systems
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Author : Richard J. Cameron
language : en
Publisher: John Wiley & Sons
Release Date : 2018-04-17
Microwave Filters For Communication Systems written by Richard J. Cameron and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-04-17 with Technology & Engineering categories.
An in-depth look at the state-of-the-art in microwave filter design, implementation, and optimization Thoroughly revised and expanded, this second edition of the popular reference addresses the many important advances that have taken place in the field since the publication of the first edition and includes new chapters on Multiband Filters, Tunable Filters and a chapter devoted to Practical Considerations and Examples. One of the chief constraints in the evolution of wireless communication systems is the scarcity of the available frequency spectrum, thus making frequency spectrum a primary resource to be judiciously shared and optimally utilized. This fundamental limitation, along with atmospheric conditions and interference have long been drivers of intense research and development in the fields of signal processing and filter networks, the two technologies that govern the information capacity of a given frequency spectrum. Written by distinguished experts with a combined century of industrial and academic experience in the field, Microwave Filters for Communication Systems: Provides a coherent, accessible description of system requirements and constraints for microwave filters Covers fundamental considerations in the theory and design of microwave filters and the use of EM techniques to analyze and optimize filter structures Chapters on Multiband Filters and Tunable Filters address the new markets emerging for wireless communication systems and flexible satellite payloads and A chapter devoted to real-world examples and exercises that allow readers to test and fine-tune their grasp of the material covered in various chapters, in effect it provides the roadmap to develop a software laboratory, to analyze, design, and perform system level tradeoffs including EM based tolerance and sensitivity analysis for microwave filters and multiplexers for practical applications. Microwave Filters for Communication Systems provides students and practitioners alike with a solid grounding in the theoretical underpinnings of practical microwave filter and its physical realization using state-of-the-art EM-based techniques.
Reconfigurable Circuits And Technologies For Smart Millimeter Wave Systems
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Author : Philippe Ferrari
language : en
Publisher:
Release Date : 2022-05-25
Reconfigurable Circuits And Technologies For Smart Millimeter Wave Systems written by Philippe Ferrari and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-05-25 with Technology & Engineering categories.
Describes the theory, modeling, and design of tunable mm-wave circuits and systems using CMOS, RF MEMS, and microwave liquid crystals.
The Rf And Microwave Handbook 3 Volume Set
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Author : Mike Golio
language : en
Publisher: CRC Press
Release Date : 2018-10-08
The Rf And Microwave Handbook 3 Volume Set written by Mike Golio and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-10-08 with Technology & Engineering categories.
By 1990 the wireless revolution had begun. In late 2000, Mike Golio gave the world a significant tool to use in this revolution: The RF and Microwave Handbook. Since then, wireless technology spread across the globe with unprecedented speed, fueled by 3G and 4G mobile technology and the proliferation of wireless LANs. Updated to reflect this tremendous growth, the second edition of this widely embraced, bestselling handbook divides its coverage conveniently into a set of three books, each focused on a particular aspect of the technology. Six new chapters cover WiMAX, broadband cable, bit error ratio (BER) testing, high-power PAs (power amplifiers), heterojunction bipolar transistors (HBTs), as well as an overview of microwave engineering. Over 100 contributors, with diverse backgrounds in academic, industrial, government, manufacturing, design, and research reflect the breadth and depth of the field. This eclectic mix of contributors ensures that the coverage balances fundamental technical issues with the important business and marketing constraints that define commercial RF and microwave engineering. Focused chapters filled with formulas, charts, graphs, diagrams, and tables make the information easy to locate and apply to practical cases. The new format, three tightly focused volumes, provides not only increased information but also ease of use. You can find the information you need quickly, without wading through material you don’t immediately need, giving you access to the caliber of data you have come to expect in a much more user-friendly format.
Cmos Active Inductors And Transformers
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Author : Fei Yuan
language : en
Publisher: Springer Science & Business Media
Release Date : 2008-06-17
Cmos Active Inductors And Transformers written by Fei Yuan and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-06-17 with Technology & Engineering categories.
Many new topologies and circuit design techniques have emerged recently to improve the performance of active inductors, but a comprehensive treatment of the theory, topology, characteristics, and design constraint of CMOS active inductors and transformers, and a detailed examination of their emerging applications in high-speed analog signal processing and data communications over wire and wireless channels, is not available. This book is an attempt to provide an in-depth examination and a systematic presentation of the operation principles and implementation details of CMOS active inductors and transformers, and a detailed examination of their emerging applications in high-speed analog signal processing and data communications over wire and wireless channels. The content of the book is drawn from recently published research papers and are not available in a single, cohesive book. Equal emphasis is given to the theory of CMOS active inductors and transformers, and their emerging applications. Major subjects to be covered in the book include: inductive characteristics in high-speed analog signal processing and data communications, spiral inductors and transformers – modeling and limitations, a historical perspective of device synthesis, the topology, characterization, and implementation of CMOS active inductors and transformers, and the application of CMOS active inductors and transformers in high-speed analog and digital signal processing and data communications.
Recent Microwave Technologies
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Author : Ahmed Kishk
language : en
Publisher: BoD – Books on Demand
Release Date : 2022-08-25
Recent Microwave Technologies written by Ahmed Kishk and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-08-25 with Technology & Engineering categories.
Microwave bands range from 300 MHz to 300 GHz of the electromagnetic spectrum. These signals can be used in communication, networking, astronomy, and biomedical engineering, among other fields. This book provides a comprehensive overview of the physics of microwave signals, techniques for modeling these signals, uses of these signals in various fields, and the underlying principles of some of the latest microwave devices currently available.
Advances In Energy Science And Equipment Engineering
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Author : Shiquan Zhou
language : en
Publisher: CRC Press
Release Date : 2015-11-05
Advances In Energy Science And Equipment Engineering written by Shiquan Zhou and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-11-05 with Science categories.
Advances in Energy Equipment Science and Engineering contains selected papers from the 2015 International Conference on Energy Equipment Science and Engineering (ICEESE 2015, Guangzhou, China, 30-31 May 2015). The topics covered include:- Advanced design technology- Energy and chemical engineering- Energy and environmental engineering- Energy scien
Practical Radio Frequency Test And Measurement
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Author : Joseph J. Carr
language : en
Publisher: Newnes
Release Date : 1999-10
Practical Radio Frequency Test And Measurement written by Joseph J. Carr and has been published by Newnes this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999-10 with Education categories.
RF circuits; transmitters; receivers; antennas; troubleshooting.
The Circuits And Filters Handbook
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Author : Wai-Kai Chen
language : en
Publisher: CRC Press
Release Date : 2002-12-23
The Circuits And Filters Handbook written by Wai-Kai Chen and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-12-23 with Computers categories.
A bestseller in its first edition, The Circuits and Filters Handbook has been thoroughly updated to provide the most current, most comprehensive information available in both the classical and emerging fields of circuits and filters, both analog and digital. This edition contains 29 new chapters, with significant additions in the areas of computer-
Integrated Multiferroic Heterostructures And Applications
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Author : Ming Liu
language : en
Publisher: John Wiley & Sons
Release Date : 2019-08-05
Integrated Multiferroic Heterostructures And Applications written by Ming Liu and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-08-05 with Science categories.
Written by well-known experts in the field, this first systematic overview of multiferroic heterostructures summarizes the latest developments, first presenting the fundamental mechanisms, including multiferroic materials synthesis, structures and mechanisms, before going on to look at device applications. The resulting text offers insight and understanding for scientists and students new to this area.