Development of a Novel Compact Narrow Band Band-pass Filter for Wireless Applications Using Composite Right/left Handed Cells PDF Download
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Author: Cuong Nguyen-Tuan Publisher: ISBN: 9781124907925 Category : Languages : en Pages :
Book Description
We present the design and development of a narrow band band-pass filter based on metamaterial concepts. First, the concept of composite right/left-handed (CRLH) transmission lines is briefly summarized. Based on this concept, we propose a novel unit cell structure built on a 3D multilayer substrate. This unit cell structure is used as a resonator in the design of a band-pass filter. The size of the left-handed band-pass filter is minimized because of the small size of the left-handed resonator. The left-handed resonator was fabricated and its electrical characteristics were measured. Finally, the narrow band band-pass filter based on the left-handed resonator was designed and optimized at 3.5 GHz to achieve 10% bandwidth. A prototype of the left-handed filter was fabricated and measured. Measurement results show that the filter has a center frequency of 3.88 GHz, an 8.63% 3 dB fractional bandwidth and 3.1 dB insertion loss at the center frequency. The rejection of this filter is better than 18 dB up to 8 GHz. The overall size of this filter is only 240 mils x 200 mils x 14 mils, which attractive to integrated circuit and cell phone applications. The analytical and experimental results of this left-handed filter contribute toward the development of novel miniaturized microwave and millimeter wave circuits based on the concept of metamaterial.
Author: Cuong Nguyen-Tuan Publisher: ISBN: 9781124907925 Category : Languages : en Pages :
Book Description
We present the design and development of a narrow band band-pass filter based on metamaterial concepts. First, the concept of composite right/left-handed (CRLH) transmission lines is briefly summarized. Based on this concept, we propose a novel unit cell structure built on a 3D multilayer substrate. This unit cell structure is used as a resonator in the design of a band-pass filter. The size of the left-handed band-pass filter is minimized because of the small size of the left-handed resonator. The left-handed resonator was fabricated and its electrical characteristics were measured. Finally, the narrow band band-pass filter based on the left-handed resonator was designed and optimized at 3.5 GHz to achieve 10% bandwidth. A prototype of the left-handed filter was fabricated and measured. Measurement results show that the filter has a center frequency of 3.88 GHz, an 8.63% 3 dB fractional bandwidth and 3.1 dB insertion loss at the center frequency. The rejection of this filter is better than 18 dB up to 8 GHz. The overall size of this filter is only 240 mils x 200 mils x 14 mils, which attractive to integrated circuit and cell phone applications. The analytical and experimental results of this left-handed filter contribute toward the development of novel miniaturized microwave and millimeter wave circuits based on the concept of metamaterial.
Book Description
Narrow Band-pass filtering techniques have been a challenging task since the inception of audio and telecommunication applications. The challenge involves keeping quality factor, gain and mid-frequency of the filter independent of each other. The critical applications require a design that ensures mid-frequency immune to the circuit component tolerances. It becomes increasingly difficult for low-frequency applications where the shift in few Hz in mid-frequency would cause desired frequencies to fall outside the filter’s bandwidth and go undetected. The selection of right topology of the filter for the best performance is the key to successful design. This book objectively compares the relative performance of none popular narrow band-pass filter topologies. The filter topologies are evaluated using a real-world practical example of designing an extremely narrow band-pass filter. The book provides guidelines for selecting the right topology for the low-frequency narrow band-pass filter.
Author: Li Zhu Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Microwave printed filters are preferred in modern mobile and satellite communication systems due to low cost, compact size, and high accuracy. In order to facilitate circuit integration and achieve high information capacity in a communication system, volume miniaturization and bandwidth modulation of the filters becomes critical. Such requirements make design and implementation of filters extremely challenging. Hence, the work presented in this thesis is focused on two aspects, namely, compact printed filter design and effective bandwidth modulation techniques. First, a simple composite right/left handed (CRLH) transmission line (TL) structure is proposed. Based on this structure, a bandpass filter which offers several advantages (e.g. compact size and low loss over traditional filters) is designed. A CAD algorithm for automated CRLH filter design is also implemented, and demonstrated through a practical example. Second, a set of ring filters with adjustable bandwidths are proposed. These filters are implemented by a combination of hairpin resonators, interdigital capacitors and/or etched slots, leading to considerably wider bandwidths as compared to traditional ring filters. In addition, by changing the geometrical parameters of the interdigital capacitors and etched slots, the bandwidth can be easily adjusted for different applications. The filters feature two transmission zeros, whose locations can be accurately determined by means of the semi-analytical model developed as part of this thesis. The proposed filter units can be cascaded to obtain sharper cutoff frequency responses. Several these filters have been fabricated and tested using Anritsu 37369D vector network analyzer. The frequency responses from measurements are in good agreement with those from simulations in the 5-9 GHz range.
Author: Nitin Muchhal Publisher: ISBN: Category : Electronic books Languages : en Pages : 0
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: Lakshman Athukorala Publisher: LAP Lambert Academic Publishing ISBN: 9783847335542 Category : Languages : en Pages : 152
Book Description
New challenges are constantly faced in the development of RF and microwave filters, which have not only sustained but fuelled microwave filter research over the many years. These developments have encouraged new solutions for the realization of compact, low loss, highly selective RF and microwave filters. This text presents a novel distributed dual-mode resonator configuration which allows the realisation of tunable, highly compact microwave bandpass filters. Many interesting and attractive characteristics of the resonator are explored in detail. Application of this resonator in bandpass filter design is discussed with examples illustrating the design process with theoretical and experimental results to showcase filter performance. All-pole, generalised Chebyshev and dual-bandpass filters are shown to be easily developed with the novel resonator while achieveing a highly miniature footprint and a wide stopband. Finally, by employing a novel non-linear distortion enhancement technique readily applicable to this resonator, the design of highly linear tunable filter is discussed.
Author: Adam Reda Hasan Alhawari Publisher: ISBN: Category : Languages : en Pages : 146
Book Description
Microstrip filters are essential components utilized in the RF/Microwave applications because of their low loss and simple structure. Moreover, it can be fabricated using simple printed circuit technology and characterize main advantages in RF/Microwave filters like high performance, light weight and low cost which the fact track of continuous evolution in wireless communication systems highly demands. This thesis presents design and development of three different microstrip bandpass filters (BPFs) for high selectivity applications. A fourth order microstrip BPF was designed using Chebychev lowpass prototype with passband ripple of 0.05 dB and bandwidth of 120 MHz, which operates at center frequency of 2.3 GHz. This filter is designed by using coupled spiral resonator, where these types of resonator structures simplify the design method for microstrip BPF and yet more efficient. This filter design is then rearranged and modified by using square spiral resonator structures and embedded-resonator topology with the same fundamental frequency to make it more compact; furthermore, it has high quality performance in terms of the frequency responses. All the microstrip BPF designs were developed and analyzed by a 3-D electromagnetic simulator. To confirm the simulation results, the three proposed filters are fabricated on R/T Duroid 5880 with dielectric constant of 2.2. The Experimental measurements are carried out using an Agilent N5230A network analyzer. The simulated and measured results are presented, compared and discussed. The analysis indicates a fairly good agreement between simulation and measurement. Finally, compact microstrip BPFs which could demonstrate high quality performance are thoroughly investigated. In this design, the minimum measured insertion loss is 2.65 dB, and the measured return loss is greater than 11 dB in the passband operating at 2.3 GHz, with a fractional bandwidth of 5.2% with two transmission zeros on both sides of the passband. The total size of this layout is 24.74 x 21.2 mm2. This new filter provides a significant size reduction of more than 30% and 18%, with respect to the conventional microstrip BPFs and the recently reported bandpass filter by Wang and others in 2008, respectively, at the same center frequency. Later, multilayer technology is used to reduce more than 25% of the filter size; which is much smaller compared to the microstrip filters using single layer structure. The new filter structure consists of four resonators placed on two stacked layers where the metallic ground plane is deposited onto bottom surface of the dielectric. The measured minimum passband insertion loss is 5.2 dB with measured return loss is no more than -17 dB in the passband. The overall filter size is 380 mm2, which is approximately 10% smaller compared to the multilayer filter reported by Denidni and Djaiz in 2005. It is also reduced more than 25% and 41% compared to our proposed single layer microstrip filter and bandpass filter reported by Wang and others in 2008, respectively, at the same center frequency. It is a promising product to attract usage in modern wireless communication system applications which demand compact size bandpass filters at very low insertion loss but high selectivity, and good out-of-band rejection.
Author: Vikram Sekar Publisher: ISBN: Category : Languages : en Pages :
Book Description
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.
Author: I. J. Bahl Publisher: Artech House ISBN: 1580533094 Category : Technology & Engineering Languages : en Pages : 509
Book Description
This practical book is the first comprehensive treatment of lumped elements, which are playing a critical role in the development of the circuits that make these cost-effective systems possible. The book offers professionals an in-depth understanding of the different types of RF and microwave circuit elements.
Author: Ricardo Marqués Publisher: John Wiley & Sons ISBN: 1118211561 Category : Technology & Engineering Languages : en Pages : 274
Book Description
The first general textbook to offer a complete overview of metamaterial theory and its microwave applications Metamaterials with Negative Parameters represents the only unified treatment of metamaterials available in one convenient book. Devoted mainly to metamaterials that can be characterized by a negative effective permittivity and/or permeability, the book includes a wide overview of the most important topics, scientific fundamentals, and technical applications of metamaterials. Chapter coverage includes: the electrodynamics of left-handed media, synthesis of bulk metamaterials, synthesis of metamaterials in planar technology, microwave applications of metamaterial concepts, and advanced and related topics, including SRR- and CSRR-based admittance surfaces, magneto- and electro-inductive waves, and sub-diffraction imaging devices. A list of problems and references is included at the end of each chapter, and a bibliography offers a complete, up-to-daterepresentation of the current state of the art in metamaterials. Geared toward students and professionals alike, Metamaterials with Negative Parameters is an ideal textbook for postgraduate courses and also serves as a valuable introductory reference for scientists and RF/microwave engineers.
Author: Cuong Nguyen-Tuan
Author: Cuong Nguyen-Tuan
Author: Raman K. Attri
Author: Li Zhu
Author: Vesna Crnojević-Bengin
Author: Nitin Muchhal
Author: Lakshman Athukorala
Author: Adam Reda Hasan Alhawari
Author: Vikram Sekar
Author: I. J. Bahl
Author: Ricardo Marqués