Rf Mems Bandpass Filter
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Rf Mems Bandpass Filter
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Author : Noel M. Elman
language : en
Publisher:
Release Date : 2000
Rf Mems Bandpass Filter written by Noel M. Elman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.
Development Of High Performance 6 18 Ghz Tunable Switchable Rf Mems Filters And Their System Implications
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Author : Kamran Entesari
language : en
Publisher:
Release Date : 2006
Development Of High Performance 6 18 Ghz Tunable Switchable Rf Mems Filters And Their System Implications written by Kamran Entesari and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
Tunable Cpw Ting Resonator Based Bandpass Filters Utilizing Rf Mems Varactors
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Author : Ahlam Mohammad Ebrahim Pish Dast
language : en
Publisher:
Release Date : 2017
Tunable Cpw Ting Resonator Based Bandpass Filters Utilizing Rf Mems Varactors written by Ahlam Mohammad Ebrahim Pish Dast and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Electric filters, Bandpass categories.
Advances In Filter Miniaturization And Design Analysis Of Rf Mems Tunable Filters
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Author : Vikram Sekar
language : en
Publisher:
Release Date : 2012
Advances In Filter Miniaturization And Design Analysis Of Rf Mems Tunable Filters written by Vikram Sekar 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.
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.
Rf Mems Based Frequency Dependent Power Limiters
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Author : Desireh Shojaei-Asanjan
language : en
Publisher:
Release Date : 2018
Rf Mems Based Frequency Dependent Power Limiters written by Desireh Shojaei-Asanjan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Microelectromechanical systems categories.
Microwave power limiters are passive devices that are widely used to protect receivers from large interfering signals. Conventional radio frequency (RF) power limiters attenuate both desired and undesired signals in the entire frequency band. The need for frequency-dependent power limiters (FDPLs) arises in cases where the system dynamic range is frequency-dependent and the threshold level is dependent on the frequency band. RF micro-electro-mechanical systems (RF MEMS) switches self-actuate under high RF power and are well-known for their linearity and very low insertion loss. A FDPL can benefit from all the advantages of RF MEMS switches, particularly the linearity. In this study, a novel approach to FDPLs is proposed. RF MEMS switches are integrated with bandpass filters to form a power limiter where the output RF power is limited to specific levels that can vary with the frequency band. Both non-planar and planar versions of FDPLs are presented using circulators and hybrids, and RF MEMS-based power limiters are analyzed theoretically and experimentally for one frequency band. The limiter attenuates the high power signal only within the bandwidth of the integrated filter. The design of the proposed power limiter is expanded to achieve power limiting for various frequency bands. The flatness of the threshold level can be set to the desired value by controlling the return loss of the filters used in the FDPL circuit. Measured results for an FDPL circuit are presented, demonstrating that the limiting power level can be controlled by adjusting the dc bias of the MEMS switches. The commercially available electrostatically actuated switches OMRON and Radant are employed for the realization of the FDPL. Additionally, tunable FDPL circuits are fabricated and measured, demonstrating the feasibility of realizing adaptive frequency-dependent power limiters. In order to improve the controllability of the proposed MEMS-based FDPL circuits, both electrostatically-actuated and thermally-actuated switches are investigated theoretically and experimentally for use in power limiter applications. It is concluded that MEMS thermally- actuated switches provide better controllability of the self-actuation RF power level through adjustment of the bias voltage to the thermal actuator. Additionally, a novel concept for realizing an RF power limiter for protecting superconductor digital receivers is proposed. A lumped-element niobium-based filter is used as a protection circuit. It consists of lumped-element resonators formed using spiral inductors and metal- insulator-metal capacitors integrated on a multilayer niobium process. The circuit operates as a bandpass filter at low power levels, allowing RF signals to pass, and as a reflector at high power levels. The lumped-element filter circuit is studied in detail to explain the performance of the filter at high power levels. It is concluded that some of the lumped-element inductors switch from being inductors when operating at low power levels to being capacitors when operating at high power levels. When the lumped-element inductors switch to capacitors, the filter circuit that consists of L-C resonators switches to a circuit that consists of capacitors, causing the input power to be reflected back. Both theoretical and experimental results are presented to verify this phenomenon. In addition to applications in power limiters, the concept can be employed to realize transmit/receive (T/R) switches in order to isolate the transmit circuit from the receive circuit.
Microstrip Filters For Rf Microwave Applications
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Author : Jia-Sheng Hong
language : en
Publisher: John Wiley & Sons
Release Date : 2011-01-06
Microstrip Filters For Rf Microwave Applications written by Jia-Sheng Hong 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 2011-01-06 with Technology & Engineering categories.
The first edition of “Microstrip Filters for RF/Microwave Applications” was published in 2001. Over the years the book has been well received and is used extensively in both academia and industry by microwave researchers and engineers. From its inception as a manuscript the book is almost 8 years old. While the fundamentals of filter circuits have not changed, further innovations in filter realizations and other applications have occurred with changes in the technology and use of new fabrication processes, such as the recent advances in RF MEMS and ferroelectric films for tunable filters; the use of liquid crystal polymer (LCP) substrates for multilayer circuits, as well as the new filters for dual-band, multi-band and ultra wideband (UWB) applications. Although the microstrip filter remains as the main transmission line medium for these new developments, there has been a new trend of using combined planar transmission line structures such as co-planar waveguide (CPW) and slotted ground structures for novel physical implementations beyond the single layer in order to achieve filter miniaturization and better performance. Also, over the years, practitioners have suggested topics that should be added for completeness, or deleted in some cases, as they were not very useful in practice. In view of the above, the authors are proposing a revised version of the “Microstrip Filters for RF/Microwave Applications” text and a slightly changed book title of “Planar Filters for RF/Microwave Applications” to reflect the aforementioned trends in the revised book.
Rf Mems Switches And Integrated Switching Circuits
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Author : Ai-Qun Liu
language : en
Publisher: Springer Science & Business Media
Release Date : 2010-08-09
Rf Mems Switches And Integrated Switching Circuits written by Ai-Qun Liu 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 2010-08-09 with Technology & Engineering categories.
Microelectromechanical Systems (MEMS) stand poised for the next major breakthrough in the silicon revolution that began with the transistor in the 1960s and has revolutionized microelectronics. MEMS allow one to not only observe and process information of all types from small scale systems, but also to affect changes in systems and the environment at that scale. “RF MEMS Switches and Integrated Switching Circuits” builds on the extensive body of literature that exists in research papers on analytical and numerical modeling and design based on RF MEMS switches and micromachined switching circuits, and presents a unified framework of coverage. This volume includes, but is not limited to, RF MEMS approaches, developments from RF MEMS switches to RF switching circuits, and MEMS switch components in circuit systems. This book also: -Presents RF Switches and switching circuit MEMS devices in a unified framework covering all aspects of engineering innovation, design, modeling, fabrication, control and experimental implementation -Discusses RF switch devices in detail, with both system and component-level circuit integration using micro- and nano-fabrication techniques -Includes an emphasis on design innovation and experimental relevance rather than basic electromagnetic theory and device physics “RF MEMS Switches and Integrated Switching Circuits” is perfect for engineers, researchers and students working in the fields of MEMS, circuits and systems and RFs.
Design And Development Of Tunable Comb Line Mems Filter
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Author : Buddhadev Pradhan
language : en
Publisher:
Release Date : 2012
Design And Development Of Tunable Comb Line Mems Filter written by Buddhadev Pradhan 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.
Modeling Design And Fabrication Of Mems Filters For Rf Applications
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Author : Siamak Fouladi Azarnaminy
language : en
Publisher:
Release Date : 2005
Modeling Design And Fabrication Of Mems Filters For Rf Applications written by Siamak Fouladi Azarnaminy and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
Currently, micro electro mechanical systems (MEMS) technology has been used in the fabrication and development of several micro devices which cover a broad range of applications. One of these application areas is the telecommunication industry. Current multi-band communication systems depend on off-chip components for frequency selection stages. Since the fabrication of these off-chip components are not compatible with IC fabrication, the electrical connection has to be in the board level, increasing the cost, size and system complexity. Recently MEMS technology has been used in constructing tunable IC components for RF and wireless transceivers, such as resonators, variable capacitors and inductors. These on-chip components can be utilized to implement system on chip (SOC) transceiver architectures with a better performance. This project is focused on modeling, design, and fabrication of band-pass filters for RF applications using MEMS components. The first class of filters is based on MEMS resonators covering a frequency range from 1MHz to 10MHz and the second class of filters use RF MEMS tunable capacitors. The project has two main parts; the first part is dedicated to the behavioral modeling and generating macro models for MEMS resonators that will be used in system level simulation of the final filter, and the second part discusses the design, fabrication, and post processing of both the MEMS resonators and MEMS variable capacitor, besides the experimental results.
Tunable Filters And Rf Mems Variable Capacitors With Closed Loop Control
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Author : Nino Zahirovic
language : en
Publisher:
Release Date : 2011
Tunable Filters And Rf Mems Variable Capacitors With Closed Loop Control written by Nino Zahirovic and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
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.