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| Author | : Gabor-Laszlo Csipkes |
| Publisher | : |
| Total Pages | : 167 |
| Release | : 2006 |
| Genre | : |
| ISBN | : 9783938863466 |
| Author | : |
| Publisher | : |
| Total Pages | : |
| Release | : 2002 |
| Genre | : |
| ISBN | : |
With the explosive development of wireless communication systems the specifications of the supporting hardware platforms have become more and more demanding. According to the long term goals of the industry, future communications systems should integrate a wide variety of standards. This leads to the idea of software defined radio, implemented on fully reconfigurable hardware. Among other reconfigurable hardware blocks, suitable for the software radio concept, an outstanding importance belongs to the reconfigurable filters that are responsible for the selectivity of the system. The problematic of filtering is strictly connected to the architecture chosen for a multi-mode receiver realization. According to the chosen architecture, the filters can exhibit low pass or band pass frequency responses. The idea of reconfigurable frequency parameters has been introduced since the beginning of modern filtering applications due to the required precision of the frequency response. However, the reconfiguration of the parameters was usually done in a limited range around ideal values. The purpose of the presented research is to transform the classical filter structures with simple self-correction into fully reconfigurable filters over a wide range of frequencies. The ideal variation of the frequency parameters is continuous and consequently difficult to implement in real circuits. Therefore, it is usually sufficient to use a discrete programming template with reasonably small steps. There are several methods to implement variable frequency parameters. The most often used programming templates employ resistor and capacitor arrays, switched according to a given code. The low pass filter implementation proposed in this work uses a special switching template, optimized for a quasi-linear frequency variation over logarithmic axes. The template also includes the possibility to compensate errors caused by component tolerances and temperature. Another important topic concerns the implement.
| Author | : Mircea Gh. Negoita |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 202 |
| Release | : 2009-03-24 |
| Genre | : Computers |
| ISBN | : 3540769943 |
Evolvable Hardware (EHW) has emerged as a sub-domain of artificial evolution represented by a design methodology (consortium of methods) involving the application of Evolutionary Algorithms (EA) to the synthesis of digital and analogue electronic circuits and systems. Nevertheless, the most benefit for the society and indeed most revolutionizing application of EA is its hardware implementation leading to the EHW. These new EA based methodologies led to a new type of machines that is evolved to attain a desired behaviour, which means they have a behavioural computational intelligence. EHW is a special case of the adaptive hardware, namely being strongly related to the Adaptive Systems (AS) and the Adaptive Hardware (AH). The book presents a careful selection of the field that very well reflects the breadth of this high technology and its terminology and applications in context of the AS/AH. The harmonious symbiosis of the engineering approach and the accurate scientific methodology features the aspects of highly relevant and practical design principles governing the development of EHW and its connections with AS/AH. This book is both attractive and useful for everybody interested in the design and analysis of EHW in context of AS/AH and implementation of real time adaptive hardware hybrid intelligent systems.
| Author | : Ville Saari |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 207 |
| Release | : 2012-03-15 |
| Genre | : Technology & Engineering |
| ISBN | : 1461433657 |
This book presents a new filter design approach and concentrates on the circuit techniques that can be utilized when designing continuous-time low-pass filters in modern ultra-deep-submicron CMOS technologies for integrated wideband radio receivers. Coverage includes system-level issues related to the design and implementation of a complete single-chip radio receiver and related to the design and implementation of a filter circuit as a part of a complete single-chip radio receiver. Presents a new filter design approach, emphasizing low-voltage circuit solutions that can be implemented in modern, ultra-deep-submicron CMOS technologies;Includes filter circuit implementations designed as a part of a single-chip radio receiver in modern 1.2V 0.13um and 65nm CMOS;Describes design and implementation of a continuous-time low-pass filter for a multicarrier WCDMA base-station;Emphasizes system-level considerations throughout.
| Author | : Ville Saari |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 207 |
| Release | : 2012-03-15 |
| Genre | : Technology & Engineering |
| ISBN | : 1461433665 |
This book presents a new filter design approach and concentrates on the circuit techniques that can be utilized when designing continuous-time low-pass filters in modern ultra-deep-submicron CMOS technologies for integrated wideband radio receivers. Coverage includes system-level issues related to the design and implementation of a complete single-chip radio receiver and related to the design and implementation of a filter circuit as a part of a complete single-chip radio receiver. Presents a new filter design approach, emphasizing low-voltage circuit solutions that can be implemented in modern, ultra-deep-submicron CMOS technologies;Includes filter circuit implementations designed as a part of a single-chip radio receiver in modern 1.2V 0.13um and 65nm CMOS;Describes design and implementation of a continuous-time low-pass filter for a multicarrier WCDMA base-station;Emphasizes system-level considerations throughout.
| Author | : Ankan Bhattacharya |
| Publisher | : CRC Press |
| Total Pages | : 365 |
| Release | : 2023-11-21 |
| Genre | : Technology & Engineering |
| ISBN | : 1000997324 |
This text showcases recent advancements in the field of microwave engineering, starting from the use of innovative materials to the latest microwave applications. It also highlights safety guidelines for exposure to microwave and radio frequency energy. The book provides information on measuring circuit parameters and dielectric parameters. • Explains microwave antennas, microwave communication, microwave propagation, microwave devices, and circuits in detail • Covers microwave measurement techniques, radiation hazards, space communication, and safety measures • Focuses on advanced computing technologies, wireless communication, and fiber optics • Presents scattering matrix and microwave passive components and devices such as phase shifters and power dividers • Showcases the importance of space communication, radio astronomy, microwave material processing, and advanced computing technologies The text provides a comprehensive study of the foundations of microwave heating and its interactions with materials for various applications. It also addresses applications of microwave devices and technologies in diverse areas, including computational electromagnetics, remote sensing, transmission lines, radiation hazards, and safety measures. It emphasizes the impact of resonances on microwave power absorption and the effect of nonuniformity on heating rates. The text is primarily written for senior undergraduate students, graduate students, and academic researchers in the fields of electrical engineering, electronics and communication engineering, computer engineering, and materials science.
| Author | : Jinjing Li |
| Publisher | : |
| Total Pages | : 79 |
| Release | : 2020 |
| Genre | : |
| ISBN | : |
Radio Frequency/Microwave filter is a key component that defines the performance of the front-end portion of the modern wireless communication system. A well-designed Radio Frequency/Microwave filter is able to select and pass/reject the frequency of the signals to be transmitted/received or attenuated with minimum added loss and interference. With the rapid development of wireless communication technologies, the modern handset device needs to integrate multiple technologies, services, and applications (LTE, Wi-Fi, Bluetooth, GPS, GNSS) covering the frequency spectrum from a few hundred megahertz to 7GHz, posing extreme challenges to the spectrum filtering functions and size reduction. The filters in the modern RF frontend are realized with filter banks, which means that each filter is dedicated to a certain frequency range for a specific service. On the other hand, filters with reconfigurable characteristics can be a good candidate to replace the traditional filter banks due to their flexibility, smaller size, and lower cost. The challenge from the current literature is the limited tuning capability and added filter losses from the tuning circuit. In this thesis, a 3rd order Chebyshev planar comb-line band-pass filter is designed at a center frequency of 1.5GHz with 20% fractional bandwidth, and 0.01 Ripple factor on a Microstrip substrate. Tuning capability is achieved by replacing the resonator-loaded capacitors with varactors. The final measurements show a tuning range from 1.45GHz to 1.71GHz, an insertion loss of 3.6dB, a return loss better than 10dB, and an out-of-band rejection better than 35dB. The size of the standalone comb-line filter is 20.8mm by 24.6mm, and the varactor-tuned filter with the biasing circuit is 63.5mm by 43.7mm. In wireless communication, the wider bandwidth allows the higher speed of signal transmission. And for tunable components, it is important to keep their performance constant. Compared to previously published works, this design is for achieving a wider bandwidth and maintaining the broad passband while tuning.
| Author | : Cesar A. Lugo (Jr) |
| Publisher | : |
| Total Pages | : 115 |
| Release | : 2006 |
| Genre | : |
| ISBN | : 9788390498409 |
This thesis discusses the investigation and development of design methodologies for the creation of multi-functional bandpass filters at microwave frequencies. These filters are capable of tuning to different frequency bands as well as varying their fractional bandwidth. The research also studies polynomial synthesis procedures as a tool for the derivation of reconfigurable planar filters with advanced asymmetrical responses.
| Author | : Saad Mekhilef |
| Publisher | : Springer Nature |
| Total Pages | : 568 |
| Release | : 2022-04-26 |
| Genre | : Technology & Engineering |
| ISBN | : 9811917426 |
This book features selected high-quality papers presented at International Conference on Electrical and Electronics Engineering (ICEEE 2022), jointly organized by University of Malaya and Bharath Institute of Higher Education and Research India during January 8–9, 2022, at NCR New Delhi, India. The book focuses on current development in the fields of electrical and electronics engineering. The book one covers electrical engineering topics–power and energy including renewable energy, power electronics and applications, control, and automation and instrumentation and book two covers the areas of robotics, artificial intelligence and IoT, electronics devices, circuits and systems, wireless and optical communication, RF and microwaves, VLSI, and signal processing. The book is beneficial for readers from both academia and industry.
| Author | : Chan Ho Kim |
| Publisher | : |
| Total Pages | : |
| Release | : 2012 |
| Genre | : |
| ISBN | : |
In modern wireless communication and radar systems, filters play an important role in getting a high-quality signal while rejecting spurious and neighboring unwanted signals. The filters with reconfigurable features, such as tunable bandwidths or switchable dual bands, also play a key part both in realizing the compact size of the system and in supporting multi-communication services. The Chapters II-IV of this dissertation show the studies of the filters for microwave communication. Bandpass filters realized in ring resonators with stepped impedance stubs are introduced. The effective locations of resonant frequencies and transmission zeros are analyzed, and harmonic suppression by interdigital-coupled feed lines is discussed. To vary mid-upper and mid-lower passband bandwidths separately, the characteristic impedances of the open-circuited stubs are changed. Simultaneous change of each width of the open-circuited stub results in variable passband bandwidths. Asymmetric stepped-impedance resonators are also used to develop independently controllable dual-band (2.4 and 5.2 GHz) bandpass filters. By extending feed lines, a transmission zero is created, which results in the suppression of the second resonance of 2.4-GHz resonators. To determine the precise transmission zeros, an external quality factor at feeders is fixed while extracting coupling coefficients between the resonators. Two kinds of feed lines, such as hook-type and spiral-type, are developed, and PIN diodes are controlled to achieve four states of switchable dual-band filters. Beam-scanning features of the antennas are very important in the radar systems. Phase shifters using piezoelectric transducers and dielectric leaky-wave antennas using metal strips are studied in the Chapters V-VII of this dissertation. Meandered microstrip lines are used to reduce the size of the phase shifters working up to 10 GHz, and reflection-type phase shifters using piezoelectric transducers are developed. A dielectric film with metal strips fed by an image line with a high dielectric constant is developed to obtain wide and symmetrical beam-steering angle. In short, many techniques are presented for realizing reconfigurable filters and large beam-scan features in this dissertation. The result of this work should have many applications in various wireless communication and radar systems.
