Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Development Of High Performance 6 18 Ghz Tunable Switchable Rf Mems Filters And Their System Implications
Download Development Of High Performance 6 18 Ghz Tunable Switchable Rf Mems Filters And Their System Implications full books in PDF, epub, and Kindle. Read online Development Of High Performance 6 18 Ghz Tunable Switchable Rf Mems Filters And Their System Implications ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Development of High Performance 6-18 GHz Tunable/switchable RF MEMS Filters and Their System Implications by : Kamran Entesari
Download or read book Development of High Performance 6-18 GHz Tunable/switchable RF MEMS Filters and Their System Implications written by Kamran Entesari and published by . This book was released on 2006 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2006 with total page 862 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advances in Filter Miniaturization and Design/analysis of RF MEMS Tunable Filters by : Vikram Sekar
Download or read book Advances in Filter Miniaturization and Design/analysis of RF MEMS Tunable Filters written by Vikram Sekar and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The main purpose of this dissertation was to address key issues in the design and analysis of RF/microwave filters for wireless applications. Since RF/microwave filters are one of the bulkiest parts of communication systems, their miniaturization is one of the most important technological challenges for the development of compact transceivers. In this work, novel miniaturization techniques were investigated for single-band, dual-band, ultra-wideband and tunable bandpass filters. In single-band filters, the use of cross-shaped fractals in half-mode substrate-integrated-waveguide bandpass filters resulted in a 37 percent size reduction. A compact bandpass filter that occupies an area of 0.315 mm2 is implemented in 90-nm CMOS technology for 20 GHz applications. For dual-band filters, using half-mode substrate-integrated-waveguides resulted in a filter that is six times smaller than its full-mode counterpart. For ultra-wideband filters, using slow-wave capacitively-loaded coplanar-waveguides resulted in a filter with improved stopband performance and frequency notch, while being 25 percent smaller in size. A major part of this work also dealt with the concept of 'hybrid' RF MEMS tunable filters where packaged, off-the-shelf RF MEMS switches were used to implement high-performance tunable filters using substrate-integrated-waveguide technology. These 'hybrid' filters are very easily fabricated compared to current state-of-the-art RF MEMS tunable filters because they do not require a clean-room facility. Both the full-mode and half-mode substrate-integrated waveguide tunable filters reported in this work have the best Q-factors (93 - 132 and 75 - 140, respectively) compared to any 'hybrid' RF MEMS tunable filter reported in current literature. Also, the half-mode substrate-integrated waveguide tunable filter is 2.5 times smaller than its full-mode counterpart while having similar performance. This dissertation also presented detailed analytical and simulation-based studies of nonlinear noise phenomena induced by Brownian motion in all-pole RF MEMS tunable filters. Two independent mathematical methods are proposed to calculate phase noise in RF MEMS tunable filters: (1) pole-perturbation approach, and (2) admittance-approach. These methods are compared to each other and to harmonic balance noise simulations using the CAD-model of the RF MEMS switch. To account for the switch nonlinearity in the mathematical methods, a nonlinear nodal analysis technique for tunable filters is also presented. In summary, it is shown that output signal-to-noise ratio degradation due to Brownian motion is maximum for low fractional bandwidth, high order and high quality factor RF MEMS tunable filters. Finally, a self-sustained microwave platform to detect the dielectric constant of organic liquids is presented in this dissertation. The main idea is to use a voltage- controlled negative-resistance oscillator whose frequency of oscillation varies according to the organic liquid under test. To make the system self-sustained, the oscillator is embedded in a frequency synthesizer system, which is then digitally interfaced to a computer for calculation of dielectric constant. Such a system has potential uses in a variety of applications in medicine, agriculture and pharmaceuticals.
Book Synopsis RF MEMS and Their Applications by : Vijay K. Varadan
Download or read book RF MEMS and Their Applications written by Vijay K. Varadan and published by John Wiley & Sons. This book was released on 2003-07-25 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microelectromechanical systems (MEMS) refer to a collection of micro-sensors and actuators, which can react to environmental change under micro- circuit control. The integration of MEMS into traditional Radio Frequency (RF) circuits has resulted in systems with superior performance levels and lower manufacturing costs. The incorporation of MEMS based fabrication technologies into micro and millimeter wave systems offers viable routes to ICs with MEMS actuators, antennas, switches and transmission lines. The resultant systems operate with an increased bandwidth and increased radiation efficiency and have considerable scope for implementation within the expanding area of wireless personal communication devices. This text provides leading edge coverage of this increasingly important area and highlights the overlapping information requirements of the RF and MEMS research and development communities. * Provides an introduction to micromachining techniques and their use in the fabrication of micro switches, capacitors and inductors * Includes coverage of MEMS devices for wireless and Bluetooth enabled systems Essential reading for RF Circuit design practitioners and researchers requiring an introduction to MEMS technologies, as well as practitioners and researchers in MEMS and silicon technology requiring an introduction to RF circuit design.
Book Synopsis Novel RF Microelectromechanical Systems Tunable Filters with Adjustable Spurious Suppression by : Vikram Sekar
Download or read book Novel RF Microelectromechanical Systems Tunable Filters with Adjustable Spurious Suppression written by Vikram Sekar and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents the theory and design of fixed and Radio Frequency (RF) Microelectromechanical Systems (MEMS) -based tunable microwave filters for RF and microwave applications. The methodology for the design of coupled resonator filters is explained in detail and is used to design an end-coupled microstrip filter at 1.5 GHz with inductive loading using a stepped microstrip discontinuity to lower the resonance frequency of the half-wavelength microstrip resonator. The fabricated endcoupled filter shows center frequencies of 1.36 GHz and 1.03 GHz in the unloaded and loaded state respectively, with insertion losses between 1.2-1.5 dB and return loss better than 10 dB in both states. The filter response shows spurious passbands at approximately twice the filter center frequencies. To overcome this problem and improve the upper rejection skirt of the filter, microstrip resonators with tapped input/output coupling and mixed inter-resonator coupling are used to suppress the spurious passband by introducing a transmission zero at spurious resonance frequency. Measurement results for the fabricated tapped-resonator filters show an improvement of the upper rejection skirt due to spurious suppression to a level of -40 dB, with insertion loss of 1.2-1.5 dB for the same center frequencies. The concepts developed from fabrication and measurement of fixed-tuned microstrip filters are used to design an inductively-loaded RF MEMS tunable filter with adjustable spurious suppression implemented using packaged metal-contact switches. The two-pole 5% filter has a tuning range of 17% from 1.06 GHz to 1.23 GHz with an insertion loss of 1.56-2.28 dB and return loss better than 13 dB over the tuning range. The inductive loading mechanism is used to tune the open-ended quarter wavelength stub such that a tunable transmission zero supresses the spurious resonance as the filter center frequency is tuned. The spurious passband response in both states is suppressed below -20 dB. The unloaded quality factor (Q) of the filter varies from 127 to 75 as the filter is tuned. The equivalent circuit model for the series metalcontact packaged RF MEMS switch used in the tunable filter is derived from full-wave electromagnetic simulations and used to predict the effect of MEMS switch parasitics on the overall performance of the tunable filter.
Book Synopsis Rf-mems Technology for High-performance Passives by : Jacopo Iannacci
Download or read book Rf-mems Technology for High-performance Passives written by Jacopo Iannacci and published by . This book was released on 2018-01-17 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book outlines the intrinsic potential of RF‑MEMS technology with specific focus on 5G mobile communications and services. Commencing with a review of the characteristics of RF‑MEMS in relation to the specifications of interest for 5G, the book proceeds to develop practical insight concerning the design and development of RF‑MEMS including case studies of design concepts. Including multiphysics simulation and animations, the book will be essential reading for both academic and industrial researchers and engineers.
Book Synopsis Design and Development of Tunable Comb Line MEMS Filter by : Buddhadev Pradhan
Download or read book Design and Development of Tunable Comb Line MEMS Filter written by Buddhadev Pradhan and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High Linearity 1.5-2.5 GHz RF-MEMS and Varactor Diodes Based Tunable Filters for Wireless Applications by : Mohammed Ahmed El-Tanani
Download or read book High Linearity 1.5-2.5 GHz RF-MEMS and Varactor Diodes Based Tunable Filters for Wireless Applications written by Mohammed Ahmed El-Tanani and published by . This book was released on 2009 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dissertation presents tunable banpass filters in the 1.5-2.5 GHz frequency range targeted for wireless applications. The tunable filters are designed for size miniaturization, good linearity and constant absolute bandwidth characteristics while maintaining low insertion loss. The improved linearity has been demonstrated using back-to-back varactor diodes and using RF MEMS devices. The constant absolute bandwidth characteristics was achieved using a novel corrugatedcoupled lines approach and also using a localized capacitive compensation concept. In the improved linearity varactor diode design, two miniaturized tunable filters with two zeros were developed at 1.4-2.0 GHz on. The filters were built using single and back-to-back varactor diodes and compared for linearity characteristics. The single diode filter has a 1-dB bandwidth of 5 " 0.5 % and an insertion loss of 2.5-1.8 dB. The back-to-back diode filter has a 1-dB bandwidth of 4.9 " 0.5 % and an insertion loss of 2.9-1.25 dB (resonator Q of 56-125). A detailed Volterra series analysis is done on the back-to-back diode including the effect of the bias network and diode mismatches. The measured IIP3 for the back-to-back diode tunable filter is 22-41 dBm depending on the bias voltage and is 13-15 dB better than the single diode design. The power handling capabilities of both designs is explored using large signal S21 measurements. To our knowledge, these planar tunable filters represent state-of-the-art insertion loss and linearity characteristics performance with varactor diodes as the tuning elements. In the corrugated coupled-lines design, miniaturized fixed and tunable microstrip bandpass filters were developed t 1.4-1.9 GHz. The novel approach uses microstrip corrugated coupled-lines concept to synthesize a coupling coefficient which maintains a nearly constant absolute bandwidth across the tuning range. In addition, a miniaturized 2-pole varactor tuned filter is demonstrated with a frequency coverage of 1.44-1.89 GHz and an insertion loss
Book Synopsis Mechanically Tunable RF/Microwave Filters by : Dong Yan
Download or read book Mechanically Tunable RF/Microwave Filters written by Dong Yan and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advanced RF MEMS by : Stepan Lucyszyn
Download or read book Advanced RF MEMS written by Stepan Lucyszyn and published by Cambridge University Press. This book was released on 2010-08-19 with total page 441 pages. Available in PDF, EPUB and Kindle. Book excerpt: An up-to-date guide to the theory and applications of RF MEMS. With detailed information about RF MEMS technology as well as its reliability and applications, this is a comprehensive resource for professionals, researchers, and students alike. • Reviews RF MEMS technologies • Illustrates new techniques that solve long-standing problems associated with reliability and packaging • Provides the information needed to incorporate RF MEMS into commercial products • Describes current and future trends in RF MEMS, providing perspective on industry growth • Ideal for those studying or working in RF and microwave circuits, systems, microfabrication and manufacturing, production management and metrology, and performance evaluation
Book Synopsis Tunable Filters and RF MEMS Variable Capacitors with Closed Loop Control by : Nino Zahirovic
Download or read book Tunable Filters and RF MEMS Variable Capacitors with Closed Loop Control written by Nino Zahirovic and published by . This book was released on 2011 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multi-band and multi-mode radios are becoming prevalent and necessary in order to provide optimal data rates across a network with a diverse and spotty landscape of coverage areas (3G, HSPA, LTE, etc.). As the number of required bands and modes increases, the aggregate cost of discrete RF signal chains justifies the adoption of tunable solutions. Tunable filters are one of the pieces crucial to signal chain amalgamation. The main requirements for a tunable filter are high unloaded quality factor, wide tuning range, high tuning speed, high linearity, and small size. MEMS technology is the most promising in terms of tuning range, quality factor, linearity and size. In addition, a filter that maintains a constant passband bandwidth as the center frequency is tuned is preferred since the analog baseband processing circuitry tends to be tailored for a particular signal bandwidth. In this work, a novel design technique for tunable fi lters with controlled and predictable bandwidth variation is presented. The design technique is presented alongside an analysis and modeling method for predicting the final filter response during design optimization.
Download or read book RF MEMS written by Gabriel M. Rebeiz and published by John Wiley & Sons. This book was released on 2004-02-06 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ultrasmall Radio Frequency and Micro-wave Microelectromechanical systems (RF MEMs), such as switches, varactors, and phase shifters, exhibit nearly zero power consumption or loss. For this reason, they are being developed intensively by corporations worldwide for use in telecommunications equipment. This book acquaints readers with the basics of RF MEMs and describes how to design practical circuits and devices with them. The author, an acknowledged expert in the field, presents a range of real-world applications and shares many valuable tricks of the trade.
Book Synopsis Microwave Filters for Communication Systems by : Richard J. Cameron
Download or read book Microwave Filters for Communication Systems written by Richard J. Cameron and published by John Wiley & Sons. This book was released on 2018-04-17 with total page 928 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Low-Loss 4-6 GHz Tunable Filter with 3-Bit High-Q Orthogonal RF-MEMS Capacitance Network by :
Download or read book Low-Loss 4-6 GHz Tunable Filter with 3-Bit High-Q Orthogonal RF-MEMS Capacitance Network written by and published by . This book was released on 2008 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: A low loss 4-6 GMz 3-bit tunable filter was designed and fabricated on a quarz substrate. A high-Q 3-bit orthogonal RF-MEMS capacitance network is presented and its significance on the filter Q is discussed. Detailed design equations for the capacitively-loaded coupled open-loop, =2 resonators and realization of capacitive external coupling with source-load impedance loading are discussed. The measured filter shows an unloaded-Q of 85-170, an insertion loss of 1.5-2.8 dB (including connector loss), and the measured 1-dB bandwidth is 4.35 +- 0.35% over the 4-6 GMz tuning range. The measured IIP3 and 1-dB power compression point at 5.91 GMz are> 40 dBm and 27.5 dBm, respectively. The unloaded Q and insertion loss can be improved to 125-210 and 1.8-1.1 dB with the use of a thicker bottom electrode. To our knowledge, this is the highest Q tunable planar filter to-date at this frequency range.
Book Synopsis High-Performance Integrated RF-MEMS: Part 1-The Process by :
Download or read book High-Performance Integrated RF-MEMS: Part 1-The Process written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: RF MEMS have been pursued for more than a decade as a solution to high-performance on-chip fixed, tunable and switchable passives. However, the implementation of RF-MEMS into products has remained elusive. This is partly due to special-purpose processes that only supported a narrow application field, in many cases optimized for single devices. This prevented aggregation of volumes to justify the manufacturing infrastructure of even a single production foundry. This paper presents a single process that has been implemented in multiple foundries and highlights a wide range of high-performance devices including switches, inductors, varactors, and phase-shifters that have been or are being built using this process. This process thus forms the foundation for a wide range of reconfigurable and tunable RF passive circuits.
Book Synopsis RF-MEMS Technology for High-performance Passives by : Jacopo Iannacci
Download or read book RF-MEMS Technology for High-performance Passives written by Jacopo Iannacci and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Commencing with a review of the characteristics of RF-MEMS in relation to 5G, the book proceeds to develop practical insight concerning the design and development of RF-MEMS including case studies of design concepts. Including multiphysics simulation and animated figures, the book will be essential reading for both academic and industrial researchers and engineers."--Prové de l'editor.
Book Synopsis Low Temperature Superconducting RF MEMS Devices by : Sara Sharifian Attar
Download or read book Low Temperature Superconducting RF MEMS Devices written by Sara Sharifian Attar and published by . This book was released on 2014 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract Superconducting microelectronics technology (SME) has the potential of realizing high speed digital receivers capable of performing direct digitization of radio frequency signals with very low power consumption. An SME receiver is implemented on a single chip using low-temperature superconducting (LTS) Josephson junctions (JJs). The technology provides ultrafast digital switches and logic circuits along with high linearity analog-to-digital converters (ADCs). However, SME technology offers limited choices for realizing reconfigurable analog front-ends. While a tunable inductor using a string of JJs or superconducting quantum interference devices (SQUIDs) can be realized using the SME technology, the main problems with these tuning inductor elements are poor linearity performance and low power handling. RF MEMS technology has the capability to offer highly linear and high power handling tuning elements such as switches and varactors. To integrate a receiver with radio frequency (RF) front-end on a single chip, MEMS devices need to be fabricated using the same fabrication process as SME technology. In this study, a post-processing technique is developed and optimized to release the MEMS parts of the SME chip while keeping the SME electronics intact. Another challenge is to design MEMS structures that can handle extreme low-temperature working environments. For the first time, superconducting niobium-based RF MEMS dc-contact switches, capacitive-contact switches and varactors are developed employing the SME technology, operating at 4K. The loss in all of the devices is extremely low and the quality factor is quite high when niobium superconducts. The mechanical performance of the MEMS structures are investigated at liquid nitrogen and liquid helium temperatures of 77k and 4K, respectively. The deformation of the MEMS structures and material stiffness at cryogenic temperature are also investigated. Additionally, more advanced tunable RF circuits are developed, fabricated and characterized, implementing the primary devices. Two types of MEMS capacitor banks are designed, post-processed and characterized using the dc-contact and capacitive-contact RF MEMS switches. The capacitor banks show a very high quality factor at 4K. As well, a single-port-double-throw switch is developed and measured as the building block for switch matrices, showing extremely low insertion loss, and tunable resonators are presented that implement both varactors and dc-contact RF MEMS switches as the tuning elements. The resonators are extremely miniaturized, with a size of [lambda]o/1600, and tunable filters are developed and characterized using these resonators. While niobium-based RF MEMS can be integrated within the niobium-layers of the SME technology, designers often do not have the flexibility to select the thickness of the MEMS structural layers. Also, since the fabrication process of SME technology is not specifically designed for MEMS technology, there are limitations in designing more reliable RF MEMS devices. A novel niobium-based micro-fabrication process is developed to integrate gold-based MEMS structures with niobium-based RF circuits. This method benefits from the very low-loss characteristic of superconducting metal niobium while implementing a more matured technology for MEMS structures. An 8-mask fabrication process is developed that allows the monolithic integration of superconducting niobium-based RF circuits with gold-based MEMS structures. By developing this fabrication method, many low-loss and high quality factor tunable RF devices can be achieved. The challenge is to maintain the quality of the niobium metal layer so that there is no degradation in the critical temperature of the niobium after going through all of the 8-mask process steps. Niobium RF devices integrated with gold-based dc-contact and capacitive-contact RF MEMS switches are fabricated and characterized on alumina substrates using the proposed fabrication process. All devices demonstrate insertion loss reduction due to the superconducting nature of niobium. The measurements of coplanar waveguide transmission lines and low-pass filters demonstrate that the critical temperature of the niobium metal layer is not degraded during the process steps. A capacitor bank is designed, fabricated and characterized showing a very high quality factor. Finally, two types of niobium tunable bandpass filters are presented that employ gold-based dc-contact RF MEMS switches as the tuning elements.
