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Attenuation Poles (attenuation + pole)

Distribution by Scientific Domains
Engineering100%

Selected Abstracts

Design of novel microstrip low-pass filter using defected ground structure

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2008
Petr Vágner
Abstract A novel microstrip low-pass filter utilizing defected ground structure (DGS) units is presented in this article. A DGS unit is simulated with different physical dimensions in order to show variation of attenuation pole and cut-off frequency. Next, a low-pass filter using proposed DGS unit is designed. A method for determining dimensions of microstrip structure and DGS units is proposed. Influence of dimensions of the microstrip structure on filter characteristics is investigated and simulated. Filters of various orders are simulated as well. Selected filter is simulated and experimentally verified. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 10,13, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22982 [source]

Dual-band microstrip-line BPFs using tap-coupling resonators

ELECTRONICS & COMMUNICATIONS IN JAPAN, Issue 6 2010
Nobuhiko Okuzaki
Abstract We focused on various dual-band microstrip-line bandpass filters (BPFs) based on tap-coupled resonators. Three types of BPFs, the basic type, multiple-pole type, and wideband type, were proposed and designed by classical filter theory based on the narrowband approximation method. These filters were analyzed by original computation programs and commercial circuit and electromagnetic simulators. The proposed BPFs were then fabricated and measured in the laboratory. The results confirm that the proposed BPFs produce dual passband response, multiple attenuation poles, and wide-passband characteristics. Very good agreement is found between the results of simulations and experiments. © 2010 Wiley Periodicals, Inc. Electron Comm Jpn, 93(6): 25,33, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecj.10212 [source]

A compact multilayer diplexer in LTCC substrate using LPF with multiple attenuation poles and wideband BPF

ELECTRONICS & COMMUNICATIONS IN JAPAN, Issue 5 2010
Shimpei Oshima
Abstract Recently, compact wideband BPFs for a UWB system have been studied actively. In this paper we propose a compact diplexer built into an LTCC substrate for a UWB system and 2.4-GHz wireless systems. First, a wideband BPF for a UWB system and an LPF with multiple attenuation poles for 2.4-GHz wireless systems are described. Second, we design matching circuits of a common port to retain the basic performance of both the BPF and the LPF. Third, in accordance with the results of the study, we design a compact diplexer built into an LTCC substrate. Finally, we verify the effectiveness of the proposed method by experiments. © 2010 Wiley Periodicals, Inc. Electron Comm Jpn, 93(5): 24,32, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecj.10210 [source]

Compact dual-band filter design using crossly coupled ,/4 SIRs embedded with spur-line for WLAN applications

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 11 2008
Pow-Wen Chen
Abstract This article presents a compact dual-band bandpass filter (BPF) design using ,/4 stepped impedance resonators (SIRs) embedded with spur-line for the WLAN applications. The filter covers both the operating frequencies of 2.45 GHz and 5.2,5.8 GHz. The crossly coupled mechanism is used in the filter design to provide attenuation poles by the passband edges for enhancing the signal selectivity and increasing stopband rejection levels. The tapped-line is incorporated in feed structure to save the circuit space. The spur-line is embedded in each I/O SIRs to push the upper stopband limit to a higher frequency. Experiments are conducted to verify the circuit performance. A good agreement is observed between the simulation and the measurement. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2807,2810, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23846 [source]

Dual-band filter design of combined half and quarter wavelength SIRs for WLAN applications

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2008
Pow-Wen Chen
Abstract This article presents a dual-band bandpass filter composed of ,/2 and ,/4 stepped impedance resonators for the wireless local area network applications. The filter covers both the operating frequencies of 2.45 GHz and 5.2-5.8 GHz. The doubly parallel-coupling mechanism is used in the filter design to reduce the insertion losses and to gain a wider bandwidth. The cross coupling configuration and the tapped-line I/O feed are adopted in this filter design to provide the attenuation poles for improving the signal selectivity and stopband rejection levels. Experiments were conducted to verify the circuit performance. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 13,15, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22979 [source]

Microstrip stepped-impedance hairpin resonator low-pass filter with defected ground structure

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 2 2006
Ju-Hyun Cho
Abstract In this paper, a new microstrip stepped-impedance hairpin resonator (SIR) low-pass filter (LPF) using a defected ground structure (DGS) is proposed. The proposed SIR hairpin low-pass filter using DGS provides a very sharp cutoff frequency response with low insertion loss. Furthermore, the SIR hairpin low-pass filter can provide attenuation poles for the wide-stopband characteristic due to the resonance characteristic of the DGS. Design parameters for the SIR low-pass filter are derived based on stepped-impedance theory and the equivalent-circuit model for the DGS. The experimental results show excellent agreement with the theoretical simulation results. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 405,408, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21364 [source]