			Home About us Contact

Proposed Filter (proposed + filter)

Distribution by Scientific Domains

Engineering	100%

Selected Abstracts

Universal resistorless current-mode filters employing CCCIIs

INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS, Issue 5-6 2008
Erkan Yuce
Abstract In this paper, four different-type second-order current-mode filters, employing second-generation current-controlled conveyors (CCCIIs) and two capacitors, are proposed. The first two of the presented filters can simultaneously realize high-output impedance low-pass, band-pass and high-pass responses. Also, the two filters can provide notch and all-pass filter responses with interconnection of the relevant output currents. The first developed one needs no critical active and passive element matching conditions and/or cancellation constraints. The second and third introduced ones employ only grounded capacitors. The fourth proposed filter derived from the third one uses only plus-type single output CCCIIs (CCCII+s). The fifth filter can be constructed using commercially available active devices such as AD844s along with additional resistors instead of CCCII+s of the fourth proposed filter to perform experimental test easily. All of the proposed filters have low active and passive element sensitivities. Time and frequency domain analyses are performed for the first, second and third realized filters using SPICE simulation program. Also, experimental test is achieved for the fifth filter. In this study, stability problems attributed to non-ideal gains of the CCCIIs and signal limitations of the first, second and third introduced filters due to restricted power supply voltages are investigated. Copyright © 2007 John Wiley & Sons, Ltd. [source]

A bandpass filter with adjustable bandwidth and predictable transmission zeros

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 2 2010
Li Zhu
Abstract In this article, a microstrip bandpass filter with an adjustable bandwidth and predictable transmission zeros is proposed. The proposed filter is implemented by combining two hairpin edge-coupled resonators with interdigital capacitors. Compared to typical edge-coupled filters, the proposed filter provides a wider bandwidth resulting from a higher coupling strength between its resonators. To further increase the coupling and consequently the bandwidth, a pair of etched slots in the ground plane is used. By adjusting the geometrical parameters of the interdigital capacitors and etched slots, the bandwidth can be easily adjusted. The filter features two transmission zeros, which are determined by means of the semi-analytical model developed as part of this work. Furthermore, the proposed filters can be cascaded to obtain a sharper cutoff frequency response. Frequency responses of the filters from measurements are in good agreement with those simulated using IE3D in the 5,9 GHz range. © 2009 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2010. [source]

Miniaturized band-stop filter based on multilayer-technique and new coupled octagonal defected ground structure with interdigital capacitor

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2010
A. Boutejdar
Abstract In this article, we proposed a new compact defected ground structure (DGS) band-stop filter with broad passband and low insertion loss in the stop-band. The philosophy of the structure behind this new microstrip band-stop filter is simple as it is composed of a pair of octagonal DGS-slots and an open-stub as compensated microstrip capacitance. The filter will be realized through direct electromagnetic coupling and slow wave effect methods. With this configuration, the BSF with higher compactness, broad passband and sharp transition characteristics was realized. The design formulas are derived by using an equivalent-circuit model of a parallel L - C resonator. Finally, an interdigital-capacitor has been designed and included in the DGS-ring-element. Better compactness of the structure and symmetry of the frequency response have been achieved as well as two reflection zeros closed to the stopband have been obtained. Thus, a selectivity of the proposed filter has been improved. To validate the feasibility of the proposed design method, both band-stop filters are designed, fabricated, and measured. The experimental results agree well with the simulation results. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 510,514, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24967 [source]

Compact dual-mode bandpass filter using arrow-shaped slot resonator

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 12 2009
Youngje Sung
Abstract A novel design of a compact bandpass ring slot filter for achieving dual-mode operation is proposed and experimentally studied. By using an arrow-shaped slot structure as a resonator, the resonant frequency of the proposed filter is significantly lowered, which can lead to a large filter size reduction for a fixed frequency operation. Two degenerate modes are achieved by loading with proper asymmetry, which can be placed at the corner of diagonals. A prototype of the proposed design is implemented and measured. From the measured results, the proposed filter has about 5.2% bandwidth at the center frequency of 0.97 GHz and a minimum insertion loss of 1.07 dB within passband. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 2989,2991, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24809 [source]

Novel dual-mode DC-block triangular-patch bandpass filter

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 7 2007
Ming Li
Abstract A novel dual-mode DC-block bandpass filter (BPF) using a pair of V-shape slots on triangular-patch resonators is developed in this letter. The V-shape slots perturb the field distributions of triangular-patch resonators and excite degenerate modes. Compared to our previous research, the length of input/output (I/O) lines of the proposed filter is reduced so that the circuit becomes compact. Finally, the good agreement between the simulated and measured results of the proposed BPF is presented. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1648,1649, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22520 [source]

The design of a compact quasi-elliptic filter using stepped impedance resonators with harmonic suppression

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2007
Yu-Wei Chen
Abstract A bandpass filter is designed at 2.4 GHz using two end-connected quarter-wavelength stepped impedance resonators. The quarter-wavelength stepped impedance resonators having one end shorted are formed by a half-wavelength stepped impedance resonator with its middle shorting to ground. The modes that the shorted-end ,/4 stepped impedance resonator supports are the (1 + 2n)/4. An enhanced U-shape coupling feed is adopted in the filter design to reduce the insertion losses as well as to suppress the first higher harmonic. A dual-path design is implemented in the proposed filter to create a quasi-elliptic frequency response. The equivalent circuit model is developed and the experiments are conducted for circuit design verification. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 800,804, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22298 [source]

Novel filter using composite right/left-handed transmission line

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 10 2006
JiuSheng Li
Abstract A novel filter using composite right/left-handed (CRLH) transmission line (TL) unit cells is designed, fabricated, and measured. After properly designing the parameters of the capacitors and the inductors, we have generated a narrow bandpass filter. The simulation results show that the bandpass filter with 4 CRLH TL unit cells has very small loss in the passband and very sharp transitions at the edges of the passband. The performances of the proposed filter are demonstrated by measured results, which are in good agreement with the simulation ones. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2013,2015, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21860 [source]

New design concept of dual-mode bandpass filter by using nonorthogonal input and output ports for wireless application

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2006
Han-Jan Chen
Abstract In this paper, new design concept of nonorthogonal input and output (I/O) ports applied to optimize dual-mode bandpass ring filter is proposed. Compared to conventional dual-mode filters, the proposed filter with nonorthogonal I/O could not only support two degenerate modes operation, but also increase design flexibility. Moreover, the design of dual-mode filters would not have an I/O geometry limitation, corresponding to high integration. Finally, a simple structure and high selectivity for the dual-mode bandpass filters were obtained. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 639,641, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21431 [source]

A microstrip interlocking-resonator bandpass filter with wideband rejection

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2005
Chu-Yu Chen
Abstract A novel miniaturized microstrip-line filter using a pair of interlocking resonators is proposed. To reduce the size dimensions and suppress the spurious responses simultaneously, a stepped-impedance structure is integrated into this new proposed filter. The cross-coupling effect can be created in this designed filter. Furthermore, the filter has two transmission zeros on both sides of the passband. The full-wave simulator IE3D is used to design and simulate the interlocking resonators bandpass filter. The design is been verified by the experiment results. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 47: 261,263, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21141 [source]

Suboptimal filter for continuous-time linear systems with unknown parameters

ASIAN JOURNAL OF CONTROL, Issue 5 2008
Du Yong Kim
Abstract The filtering problem for continuous-time linear systems with unknown parameters is considered. A new suboptimal filter is herein proposed. It is based on the optimal mean-square linear combination of the local Kalman filters. In contrast to the optimal weights, the suboptimal weights do not depend on current observations; thus, the proposed filter can easily be implemented in real-time. Examples demonstrate high accuracy and efficiency of the suboptimal filter. Copyright © 2008 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society [source]

Generation and classification of Kerwin,Huelsman,Newcomb circuits using the DVCC

INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS, Issue 7 2009
Ahmed M. Soliman
Abstract New circuits realizing the Kerwin,Huelsman,Newcomb (KHN) and using three or four differential voltage current conveyor (DVCC) are generated from the basic KHN and inverted KHN block diagrams. The circuits are classified into two types, type A employs three DVCC and type B employs four DVCC. Each type includes four classes of circuits depending on the four possible integrator polarities. Each class can be realized by several circuits as will be demonstrated in the paper. All the eight possible sign combinations of the output voltages polarities are obtainable from the two types; four sign combinations from each type. The eight block diagrams are included to demonstrate the difference between each class of circuits. Spice simulation results demonstrating the practicality of the proposed filters are included. Copyright © 2008 John Wiley & Sons, Ltd. [source]