Electronic filter

About: Electronic filter is a research topic. Over the lifetime, 13207 publications have been published within this topic receiving 93063 citations. The topic is also known as: filter.

Integrated microwave filters in MCM-D

Abstract: Thin film multilayer Multichip Module technology (MCM-D) may be used to realise microwave circuits such as capacitors and inductors. These may be combined to form passive filter structures. Such filters are an essential element of microwave circuits. On monolithic microwave integrated circuits, these structures require a large area resulting in a high cost. In this paper we present microwave filters integrated in multilayer MCM-D technology. As MCM-D also provides the interconnect between the individual microwave components, an integrated microwave Junction is realised, reducing the global system cost. The inductive and capacitive elements that are used to realise the filters are presented. The design of a low pass and a band pass filter using these elements is discussed. Finally, measurements of realised filters are presented.

Sagnac loop in ring resonators for tunable optical filters

Abstract: General filter architecture using co- and counterpropagation signals are studied. A specific configuration based on a Sagnac loop within a ring resonator is analyzed. Novel tuning, apart from conventional tuning, is achieved by changing the coupling ratio of a coupler through the adjustment of the equivalent loop length. Full equations describing the filter behavior in passive and active configurations, and simple closed-form formulas to compute the tuning, tolerance, and full-width at half-maximum are reported. The performance of these devices is discussed for their application as selective or channel-dropping ultra-narrow-band filters. The effect of losses and their dispersion properties are also discussed. These devices can be conveniently implemented, using silicon- or InP-integrated optic technology, for they have high free spectral ranges.

Broadband microwave bias network

Abstract: For supplying a bias (modulation) signal, either AC or DC, to a microwave circuit, a network consisting of a low pass filter is provided which presents a high isolating impedance to an extremely wide bandwidth of microwave frequencies, while allowing low frequency bias or modulating signals to be supplied to the microwave circuit without significant attenuation. The network consists of two helical inductors, one within the other, plus a bypass capacitor. The inner small inductor presents a high, non-resonant impedance to high microwave frequencies and the outer, larger inductor presents a high impedance to lower microwave frequencies. The bypass capacitor cooperates with the outer inductor to complete the filter circuit for the lower microwave frequencies. The smaller inductor's proximity to and within the larger inductor provides a distributed shunt capacitance to ground so as to terminate the filter for the higher microwave frequencies at the smaller inductor.

Three-Phase Hybrid Shunt Filters for Power Quality Improvement

Abstract: Active power filters can be cost-effective for use in practical systems with the insertion of a few passive elements in shunt or series configuration. The resulting hybrid filters can be designed to provide dominant lower order harmonic elimination and reactive power support by the passive elements so that the burden on the active filter counterpart is reduced. In this paper, the rate reduction in the shunt active filter is estimated when it is connected in parallel with suitable passive tuned harmonic filters. The active filtering system is based on an appropriate control scheme. The simulation and the experimental results of the shunt active filter, along with the estimated value of reduction in rating, show that the hybrid shunt filtering system is quite effective in compensating for the harmonics and reactive power, in addition to being cost-effective.

Simulating lossless ladders with transconductance-C circuits

Abstract: It is demonstrated in this brief that the two predominant methods for simulating an active LC ladder-operational simulation and element replacement-result in exactly the same active transconductance-capacitor filter circuit. Neither method, therefore, has any practical advantages or disadvantages over the other. Rather, a procedure can be selected purely for the designer's convenience.