Absorptive near-Gaussian low pass filter design with applications in the time and frequency domain

Breitbarth, Jason; Schmelzer, Dennis

doi:10.1109/mwsym.2004.1338805

Cited by 9 publications

(3 citation statements)

References 2 publications

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“…Low-Q lossy resonators are also used to achieve either one-port absorption [18]- [20] or symmetrical two-port absorption [21]- [25] for bandstop filters. Quasi-Gaussian lowpass filter prototypes are reported with both ports reflectionless because of the lossy components in the circuit [26], [27]. A 3.0-GHz distributed quasi-absorptive BPF is presented in [28] by using resistor-loaded lossy resonators as its first resonator to absorb reflection at only one side.…”

Section: Introductionmentioning

confidence: 99%

High-Order Dual-Port Quasi-Absorptive Microstrip Coupled-Line Bandpass Filters

Liu

2020

IEEE Trans. Microwave Theory Techn.

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In this paper, we present the first demonstration of distributed and symmetrical all-band quasi-absorptive filters that can be designed to arbitrarily high orders. The proposed quasi-absorptive filter consists of a bandpass section (reflective-type coupled-line filter) and absorptive sections (a matched resistor in series with a shorted quarter-wavelength transmission line). Through detailed analysis, we show that the absorptive sections not only eliminate out-of-band reflections but also determine the passband bandwidth. As such, the bandpass section mainly determines the out-of-band roll-off and the order of the filter can be arbitrarily increased without affecting the filter bandwidth by cascading more bandpass sections. A set of 2.45-GHz 1-, 2-, and 3-pole quasi-absorptive microstrip bandpass filters are designed and measured. The filters show simultaneous input and output absorption across both the passband and the stopband. Measurement results agree very well with the simulation and validate the proposed design concept.

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Section: Introductionmentioning

confidence: 99%

High-Order Dual-Port Quasi-Absorptive Microstrip Coupled-Line Bandpass Filters

Liu

2020

IEEE Trans. Microwave Theory Techn.

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“…Conventional solutions to this problem involve using attenuators or non-reciprocal components, such as isolators absorption [21]- [25] for bandstop filters. Quasi-Gaussian lowpass filter prototypes are reported with both ports reflectionless because of the lossy components in the circuit [26], [27]. A 3.0-GHz distributed quasi-absorptive BPF is presented in [28] by using resistor-loaded lossy resonators as its first resonator to absorb reflection at only one side.…”

Section: Introductionmentioning

confidence: 99%

High-Order Dual-Port Quasi-Absorptive Microstrip Coupled-Line Bandpass Filters

Wu¹,

Liu²,

Li³

2020

Preprint

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In this article, we present the first demonstration of distributed and symmetrical all-band quasi-absorptive filters that can be designed to arbitrarily high orders. The proposed quasi-absorptive filter consists of a bandpass section (reflective-type coupled-line filter) and absorptive sections (a matched resistor in series with a shorted quarter-wavelength transmission line). Through a detailed analysis, we show that the absorptive sections not only eliminate out-of-band reflections but also determine the passband bandwidth (BW). As such, the bandpass section mainly determines the out-of-band roll-off and the order of the filter can be arbitrarily increased without affecting the filter BW by cascading more bandpass sections. A set of 2.45-GHz one-, two-, and three-pole quasi-absorptive microstrip bandpass filters are designed and measured. The filters show simultaneous input and output absorption across both the passband and the stopband. Measurement results agree very well with the simulation and validate the proposed design concept.

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“…In [1] we have the first example of these filters using resistive elements to absorb the reflected energy. [3] Presents other configurations of these line losses, whilst [4] give an application example to these approaches.…”

Section: Introductionmentioning

confidence: 99%

Flat group delay low pass filters using two CPW topologies

Khireddine

Drissi

Soares

2005

IEEE MTT-S International Microwave Symposium Digest, 2005.

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Improved and small flat group delay low pass filters are presented. The design of these filters is based on two CPW stub topologies. The improvement of the flatness group delay is achieved by loading the stub at the appropriate positions. The straight stub filter is realised and measured, and a good agreement is observed. The second topology is based on a reshaped open circuit stub. The optimized structures are well matched beyond the cutoff frequency with a flat group delay.

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Absorptive near-Gaussian low pass filter design with applications in the time and frequency domain

Cited by 9 publications

References 2 publications

High-Order Dual-Port Quasi-Absorptive Microstrip Coupled-Line Bandpass Filters

High-Order Dual-Port Quasi-Absorptive Microstrip Coupled-Line Bandpass Filters

High-Order Dual-Port Quasi-Absorptive Microstrip Coupled-Line Bandpass Filters

Flat group delay low pass filters using two CPW topologies

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