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Author: Lakshman Athukorala
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Lakshman Athukorala
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Nitin Muchhal
Publisher:
ISBN:
Category : Electronic books
Languages : en
Pages : 0
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Book Description
Microwave planar bandpass filters are indispensable in wireless communication systems in most applications. With miniaturization and limited spectrum, there is a great need for a compact, selective bandpass filter with a wide stopband performance. Substrate integrated waveguide (SIW) has become a potential technology for designing and developing microwave and millimeter-wave components, circuits, and systems. This chapter presents novel, compact metamaterial-based bandpass filters with improved stopbands. Several filters,Äô design methodology and performance are evaluated using broadside-coupled complementary split-ring resonators (BC-CSRR) and edge-coupled complementary split-ring resonators (EC-CSRR) techniques. A comprehensive method to evaluate negative permittivity and permeability for designing the proposed metamaterial structure is also described. These filters have not only compact size but also a wider upper stopband resulting from bandstop resonator characteristics.
Author: Muhammad Riaz
Publisher:
ISBN:
Category : Microwave communication systems
Languages : en
Pages : 340
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Book Description
"Filters are integral components in all wireless communication systems, and their function is to permit predefined band of frequencies into the system and reject all other signals. The ever-growing demand in the use of the radio frequency (RF) spectrum for new applications has resulted in the need for high performance microwave filters with strict requirements on both inband and out-of-band characteristics. High selectivity, high rejection, low loss and extremely wide spurious-free performance are required for both transmitter and receiver channels. In addition, these devices need to be highly compact, easy to integrate within transceivers and should be amenable to low cost manufacturing. High selectivity is essential to enable the guard band between adjacent channels to be reduced thus improving the efficiency of the RF spectrum and hence increasing the capacity of the system. A low insertion-loss, high return-loss and small group-delay in the passband are necessary to minimize signal degradation. A wide stopband is necessary to suppress spurious passbands outside the filter's bandwidth that may allow spurious emissions from modulation process (harmonic, parasitic, intermodulation and frequency conversion products) and interfere with other systems. The EMC Directive 89/336/EEC mandates that all electronic equipment must comply with the applicable EN specification for EMI. This thesis presents the research work that has resulted in the development of innovative and compact microstrip bandpass filters that fulfil the above stringent requirements for wireless communication systems. In fact, the proposed highly compact planar microstrip filters provide an alternative solution for existing and next generation of wireless communications systems. In particular, the proposed filters exhibit a low-loss and quasi-elliptic function response that is normally only possible with filter designs using waveguides and high temperature superconductors. The selectivity of the filters has been improved by inserting a pair of transmission zeros between the passband edges, and implementing notched rejection bands in the filter's frequency response to widen its stopband performance. The filter structures have been analysed theoretically and modelled by using Keysight Technologies' Advanced Design System (ADS?) and Momentum® software. The dissertation is essentially composed of four main sections. In the first section, several compact and quasi-elliptic function bandpass filter structures are proposed and theoretically analysed. Selectivity and stopband performance of these filters is enhanced by loading the input and output feed-lines with inductive stubs that introduce transmission zeros at specified frequencies in the filter?s frequency response. This technique is shown to provide a sharp 3-dB roll-off and steep selectivity skirt with high out-of-band rejection over a wide frequency span. In addition, the 3-dB fractional bandwidth of the filters is shown to be controllable by manipulating the filter's geometric parameters. Traditional microwave bandpass filters are designed using quarter-wavelength distributed transmission-line resonators that are either end-coupled or side-coupled. The sharpness of the filter response is determined by the number of resonators employed which degrades the filter?s passband loss performance. This results in a filter with a significantly larger footprint which precludes miniaturization. To circumvent these drawbacks the second section describes the development of a novel and compact wideband bandpass filter with the desired characteristics. The quasi-elliptic function filter comprises open-loop resonators that are coupled to each other using a stub loaded resonator. The proposed filter is shown to achieve a wideband 3-dB fractional bandwidth of 23% with much better loss performance, sharp skirt selectivity and very wide rejection bandwidth. The third section describes the investigation of novel ultra-wideband (UWB) microstrip bandpass filter designs. Parametric study enabled the optimization of the filter's performance which was verified through practical measurements. The proposed filters meet the stringent characteristics required by modern communications systems, i.e. the filters are highly compact and miniature even when fabricated on a low dielectric constant substrate, possess a sharp quasi-elliptic function bandpass response with low passband insertion-loss, and ultra-wide stopband performance. With the rapid development of multi-band operation in modern and next generation wireless communication systems, there is a great demand for single frequency discriminating devices that can operate over multiple frequency bands to facilitate miniaturization. These multi-band bandpass filters need to be physically small, have low insertion-loss, high return-loss, and excellent selectivity. In the fourth section two miniature microstrip dual-band and triple-band bandpass filter designs are explored. A detailed parametric study was conducted to fully understand how the geometric parameters of the filters affected their performance. The optimized filters were fabricated and measured to validate their performance." -- Abstract.
Author: Xiaojun Bi
Publisher: Springer Nature
ISBN: 9811678413
Category : Technology & Engineering
Languages : en
Pages : 134
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Book Description
The book systematically introduces the design theory and method of multi-band RF filtering circuits for the modern wireless communication systems or radar systems, which are required to operate at multi-bands. These multi-band filtering RF circuits have drawn more and more attention from the engineers and scientists in the field of RF circuits design. The book proposes the detailed theoretical analysis and abundant experimental data of multi-mode resonators, multi-band bandpass filter with high selectivity, reflectionless multi-band bandpass filter, balanced filter with high suppression, slotline based multi-band balun filter, switchable filtering diplexer based on reused L-shape resonator and miniaturized 55-/95-GHz on-chip dual-band bandpass Filter. The book is intended for undergraduate and graduate students who are interested in filtering circuits design, researchers who are investigating RF & microwave systems, as well as design engineers who are working in the RF & microwave circuits field. Readers can get an in-depth understanding about the multi-band RF filtering circuits design theory and method.
Author: 陳建勳
Publisher:
ISBN:
Category :
Languages : en
Pages : 200
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Author: Akira Namatame
Publisher: World Scientific
ISBN: 9814733660
Category : Technology & Engineering
Languages : en
Pages : 512
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Book Description
This book is a collection of all papers presented at the 2015 International Workshop on Wireless Communication and Network (IWWCN 2015), which was held on August 21-23, 2015 in Kunming, Yunnan, China. The book provides cutting-edge development and signification contributions to all major fields of wireless communication and network. The book will benefit global researchers and practitioners in the field.
Author: Jia-Sheng Hong
Publisher: John Wiley & Sons
ISBN: 1118002121
Category : Technology & Engineering
Languages : en
Pages : 608
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Book Description
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.
Author: Jia Ni
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Hanan Jabbar
Publisher:
ISBN: 9783659832499
Category :
Languages : en
Pages :
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Author: Sudipta Das
Publisher: LAP Lambert Academic Publishing
ISBN: 9783659140938
Category :
Languages : en
Pages : 160
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Book Description
Microwave filters are vital component in wireless communication system.The use of microstrip technology in the design of microwave components and and integrated circuits has gained tremendous popularity since last decade because microstrip can operate in a wide range of frequencies.The book has been prepared for use as reference book for the undergraduate and post graduate Engineering Students.This book will be suitable for the students who are interested in the field of Microstrip Technology.This book serves all the Basic Requirement of the students who are doing their projects/thesis in Microstrip Filter.This book clearly explains the basic concepts and design methods of two types of Microstrip low pas filter i.e.,low pass filter with stubs,low pass filter with stepped impedance microstrip line, Wide band band stop filter using open circuited stubs and parallel coupled bandpass filter and Gap coupled band pass filter for wireless communication.The idea of Electromagnetic simulation software IE3D is also mentioned in this book.The application of matlab for filter design is also mentioned in this book.
