Topic
Butterworth filter
About: Butterworth filter is a research topic. Over the lifetime, 6187 publications have been published within this topic receiving 69070 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this paper, a miniaturized dual-mode bandpass filter with controllable harmonic response for dual-band applications is presented, which is designed with loading distributed capacitors in the inner area of conventional dualmode loop resonator.
Abstract: A miniaturized dual-mode bandpass filter with controllable harmonic response for dual-band applications is presented in this paper. The new bandpass filter is designed with loading distributed capacitors in the inner area of conventional dual-mode loop resonator. This loading can realize both compact size and controllable harmonic response of the filter. A demonstrated filter with the dual-band operating at 1.8 and 2.6 GHz was designed, fabricated and measured. Simulated and measured results indicate that a high selective dual-mode dual-band filter with its size reduced to 34.5% of the conventional case at about 1.8 GHz has been achieved.
21 citations
Patent•
11 Jul 2011
TL;DR: In this article, a bandstop filter is tuned to the first bandpass filter in such a way that it blocks a contiguous wavelength range that partially overlaps with a pass-band width.
Abstract: The present invention relates to an optical bandpass filter system, which has at least one combination of a bandpass filter comprising a first nanostructured metallic layer (4) and a bandstop filter comprising a second nanostructured metallic layer (7), which are arranged one behind the other and the layer thicknesses of which differ. The bandstop filter is tuned to the first bandpass filter in such a way that it blocks a contiguous wavelength range that partially overlaps with a pass-band width of the bandpass filter. With the proposed optical filter system, different filter characteristics can be realized in a confined space alongside one another with a small pass-band width.
21 citations
TL;DR: In this article, a niobium-based low temperature superconducting 7-pole bandpass filter with a wide bandwidth at the UHF band is designed and tested, which has a relative bandwidth of 80% and is extremely miniaturized with a total dimension of less than 3 mm × 1 mm.
Abstract: A niobium-based low temperature superconducting 7-pole bandpass filter with a wide bandwidth at the UHF band is designed and tested. The filter has a relative bandwidth of 80% and is extremely miniaturized with a total dimension of less than 3 mm × 1 mm. The filter topology is that of the bandpass transformed lowpass prototype filter with alternating shunt and series resonators. The filter has a wide spurious free stopband up to 4 GHz. The measured results are in very good agreement with theoretical design predictions.
21 citations
19 Jun 2017
TL;DR: This algorithm can help with the identification of battery parameter that rejects measurement noise and maintains the accuracy of online battery parameter identification for future online model-based battery SOC/SOH estimation.
Abstract: The advent of Energy Management (EM) and Electric Vehicles (EV) have completely changed the use of batteries. Accurately estimating the remaining power in batteries has become increasingly important. In order to estimate precise battery state of charge (SOC)/state of health (SOH) value, accurate parameter identification is essential when constructing an accurate battery model. Even though we are able to exactly identify battery parameters offline, the precision of online parameter identification usually suffers from measurement noise, which is an unavoidable phenomenon. In this paper we investigate how battery parameter identification is influenced by measurement noise. The selection of a low pass filter is also discussed and a fourth order Butterworth filter is adopted to effectively reject high frequency measurement noise. This algorithm can help with the identification of battery parameter that rejects measurement noise and maintains the accuracy of online battery parameter identification for future online model-based battery SOC/SOH estimation.
21 citations
Patent•
30 Sep 1999TL;DR: In this paper, the passband of a wideband bandpass filter is divided into a plurality of pass bands by stop bands of one or more band-elimination filters, and signals having frequencies corresponding to these divided pass bands are able to pass through the filter unit simultaneously.
Abstract: A filter unit comprises a wideband bandpass filter; at least one band-elimination filter having a stop band within the passband of the bandpass filter, so that the passband is divided into a plurality of pass bands by the stop band; and the wideband bandpass filter and the band-elimination filter being disposed in a single dielectric member. Since the passband of a wideband bandpass filter is divided into a plurality of pass bands by stop bands of one or more band-elimination filters, signals having frequencies corresponding to these divided pass bands are able to pass through the filter unit simultaneously.
21 citations