Bandpass Filter Design (bandpass + filter_design)

Distribution by Scientific Domains


Selected Abstracts


Cross-coupled Hilbert spiral resonator for bandpass filter design

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 8 2007
Ji-Chyun Liu
Abstract The modified cross-coupled spiral resonators with Hilbert configuration are introduced for a large coupling coefficient in this article. For comparison, the conventional cross-coupled spiral resonators are fabricated and measured herein. To obtain low insertion loss (,0.27 dB), high out-of-band rejection level (,19.5 dB) and wider FBW (50.9%), the filter of simplified CCSR-H is proposed. Results included surface current distribution and frequency responses are presented and discussed. 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1890,1894, 2007; Published online in Wiley Inter-Science (www.interscience.wiley.com). DOI 10.1002/mop.22630 [source]


A hairpin line wideband bandpass filter design with embedded open stubs

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 4 2007
Cheng-Yuan Hung
Abstract In this paper, a compact three-poles hairpin line wideband bandpass filter with several embedded open stubs to improve the stopband is designed and implemented on print circuit board substrate. This filter at center frequency f0 of 4.25 GHz has presented almost very good measured characteristics, including the bandwidth of 3.1,5.4 GHz (3-dB fractional bandwidth of 54%), low insertion loss of ,0.7 0.4 dB, sharp rejection due to two transmission zeros in the passband edge created by interstage coupling, and wide stopband rejection greater than 15 dB from 5.6 to 11 GHz. Experimental results of the fabricated filter show a good agreement with the predict results. 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 934,936, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22302 [source]


Compact LTCC bandpass filter design with controllable transmission zeros in the stopband

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 10 2006
Jianhua Deng
Abstract Method of designing a modified Chebyshev bandpass filter with controllable transmission zeros in the stopband is described. A novel compact structure of this kind of filter with a transmission zero located at higher stopband for LTCC implementation is proposed. The filter has promising potential applications in miniaturized wireless communication systems. 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1919,1922, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21814 [source]


New planar slotted-patch resonator for miniaturized bandpass filter applications

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 6 2006
Wen-Jian Zhang
Abstract A new planar slotted-patch resonator is proposed for RF and microwave bandpass filter design. The novelty of the proposed resonator is that it can reduce the size of the filter significantly. It is found that the resonant frequency of the resonator is reduced (for example, by 61%). A dual-mode filter operating at 2.39 GHz with 1.7% bandwidth and a three-pole bandpass filter operating at 2.375 GHz with 8.8% bandwidth are designed and fabricated. The measured results agree very well with the full-wave EM simulation. 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1110,1112, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21557 [source]


RF MEMS-based tunable filters

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 5 2001
James Brank
Abstract This paper overviews the application of RF MEMS switches in tunable filters as well as circuit developments for bandpass filters covering 110 MHz to 2.8 GHz. RF MEMS have several desirable features, including small size, low power requirements, and low loss. The basic operation of Raytheon's RF MEMS capacitive membrane switch is described. An overview of the technique used to integrate the switch into a variable capacitor structure with sixteen capacitance states is provided. Variable capacitor structures are used to construct multipole lumped bandpass filter designs, each with sixteen states. Finally, measured data from two representative five- and six-pole bandpass filters are presented. Characterization data demonstrates that the insertion loss for the five-pole filter using on-chip inductors was between 6.6 and 7.3 dB, and between 3.7 and 4.2 dB for the six-pole filter using off-chip inductors. 2001 John Wiley & Sons, Inc. Int J RF and Microwave CAE 11: 276,284, 2001 [source]