Low Loss 4 6 Ghz Tunable Filter With 3 Bit High Q Orthogonal Rf Mems Capacitance Network
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Advanced Rf Mems
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Author : Stepan Lucyszyn
language : en
Publisher: Cambridge University Press
Release Date : 2010-08-19
Advanced Rf Mems written by Stepan Lucyszyn and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-08-19 with Technology & Engineering categories.
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
Low Loss 4 6 Ghz Tunable Filter With 3 Bit High Q Orthogonal Rf Mems Capacitance Network
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Author :
language : en
Publisher:
Release Date : 2008
Low Loss 4 6 Ghz Tunable Filter With 3 Bit High Q Orthogonal Rf Mems Capacitance Network written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
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.
Advances In Multi Band Microstrip Filters
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Author : Vesna Crnojević-Bengin
language : en
Publisher: Cambridge University Press
Release Date : 2015-06-11
Advances In Multi Band Microstrip Filters written by Vesna Crnojević-Bengin and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-06-11 with Technology & Engineering categories.
The first of its kind, this comprehensive work details the theory and practical design of new multi-band filters.
Dissertation Abstracts International
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Author :
language : en
Publisher:
Release Date : 2008
Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Dissertations, Academic 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.
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.
High Linearity 1 5 2 5 Ghz Rf Mems And Varactor Diodes Based Tunable Filters For Wireless Applications
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Author : Mohammed Ahmed El-Tanani
language : en
Publisher:
Release Date : 2009
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 has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
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
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.
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.
Design And Fabrication Of Centre Frequency And Bandwidth Tunable Cavity Filters
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Author : Mitra Nasresfahani
language : en
Publisher:
Release Date : 2014
Design And Fabrication Of Centre Frequency And Bandwidth Tunable Cavity Filters written by Mitra Nasresfahani and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
To facilitate efficient utilization of limited and expensive frequency spectrum in communication system, fully tunable filters are highly demanded. Realizing an absolute constant bandwidth, a reasonable return loss, and a high Q value over a relatively wide tuning range are some of the challenges in developing tunable filters for real system applications. This thesis deals with the design and implementation of combline cavity filters with bandwidth and centre frequency tunability. Cavity filters offer high Q and good power handling capability. This dissertation is organized in three parts. In the first part, we study the design of constant absolute bandwidth tunable filters. We first design and implement a 5-pole C-band Chebyshev tunable filter with 40 MHz bandwidth and frequency tuning range of 4.9-6 GHz. The inter-resonator coupling elements are realized using horizontal irises. The fabricated filter exhibits a stable response over the tuning range with a bandwidth variation of ±5.3%. We then exploit semi-vertical irises to realize adjacent coupling values in a 7-pole X-band Chebyshev tunable filter with 80MHz bandwidth and frequency tuning range of 7-7.9 GHz. The fabricated filter reveals a stable response over the tuning range with a bandwidth variation of ±6.7% . We also show that using vertical irises, the normalized coupling values remain almost independent of the cavity resonant frequency. This is in contrast to horizontal or semi-vertical irises where a tedious optimization is required to achieve the same goal. In the second part, the objective is to design a fully tunable filter with wide tuning range. To achieve bandwidth tuning, two tunable filters are cascaded. Due to the wide tuning range and large bandwidth requirements, each individual filter can not maintain a constant absolute bandwidth over the tuning range. Since only the cascaded response matters, the concept of constant return loss design is introduced where the return loss remains constant while the bandwidth could change over the tuning range. All the inter-resonator coupling elements as well as normalized input and output impedances should scale with the same factor in a constant return loss design. We show that this requirement can be achieved by careful design of filter geometry for a 6-pole tunable Chebyshev filter with tuning range of 1.8-2.6 GHz. Despite the large bandwidth variation ±12.8% , the return loss of the fabricated filter is better than 15 dB over the tuning range. Two of such filters are then cascaded by an isolator to provide the bandwidth tunability. The cascaded response exhibits a tunable bandwidth of 20-100MHz. In the third part, the focus is on the design of a fully tunable two-port triplexer in which three fully tunable bandpass filters are connected together through input and output manifolds. After designing three fully tunable filters, manifold dimensions are optimized in ADS circuit simulator. Simulation results show that the bandwidth and centre frequency of each band can be independently tuned.