Reflectionless Filter Structures

Morgan, Matthew A.; Boyd, Tod A.

doi:10.1109/tmtt.2015.2403841

Cited by 123 publications

(77 citation statements)

References 4 publications

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“…Absorptive section [32]. (b) Distributed absorptive BPF presented in [31]. (c) A comparison of the simulated S 21 between the proposed work and those of [32] and [31].…”

Section: Bandpass Sectionmentioning

confidence: 99%

“…(b) Distributed absorptive BPF presented in [31]. (c) A comparison of the simulated S 21 between the proposed work and those of [32] and [31]. (d) A comparison of the simulated S 11 between the proposed work and those of [32] and [31].…”

Section: Bandpass Sectionmentioning

confidence: 99%

“…(c) A comparison of the simulated S 21 between the proposed work and those of [32] and [31]. (d) A comparison of the simulated S 11 between the proposed work and those of [32] and [31]. (e)-(g) A comparison of the simulated S 21 between the overall absorptive filter and its bandpass section in [31], [32], and this work.…”

Section: Bandpass Sectionmentioning

confidence: 99%

“…Outside of the passband, the stubs appear as matched load to the ground and contribute to the absorption of out-of-band signals. Compared with other state-of-the-art absorptive filters, particularly [31] and [32], the proposed architecture is the first that realizes a distributed and symmetrical all-band absorptive filter that can be extended to arbitrarily high orders. We validate the proposed concept by demonstrating a set of 2.45-GHz absorptive filters showing 1-, 2-, and 3-pole roll-off characteristics.…”

Section: Introductionmentioning

confidence: 99%

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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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“…Absorptive section [32]. (b) Distributed absorptive BPF presented in [31]. (c) A comparison of the simulated S 21 between the proposed work and those of [32] and [31].…”

Section: Bandpass Sectionmentioning

confidence: 99%

Section: Bandpass Sectionmentioning

confidence: 99%

Section: Bandpass Sectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Wu¹,

Liu²,

Li³

2020

Preprint

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“…Another option is to use a diplexer with the high-pass port connected to a 50 Ω termination. The reflectionless filter architecture from [63,64] is a potential compact absorptive filtering solution, as it can provide a wideband match in both of its pass and stop-bands. While the rejection of this type of filter is limited, they can be cascaded to achieve a desired rejection value.…”

Section: If Port Will Bementioning

confidence: 99%

A Miniaturized Delay-Line Discriminator

Young¹

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This thesis presents the design of a miniaturized delay-line discriminator (DLD) array for electronic warfare (EW) applications. Over very wide bandwidths, delay-line discriminators can provide the high accuracy, low latency measurements desired in many EW systems. The drawback to these circuits is that they can be quite bulky due to the long time delays they require. To miniaturize the discriminator's delay line, the design employed a slow-wave transmission line that allowed for a length reduction of approximately 60 %. An array consisting of four discriminators with delay ratios of 1, 2, 4, and 16 was fabricated on a 4-layer printed circuit board. The design obtained a measurement range of over 2 GHz with better than 4 MHz RMS accuracy. Additional processing of the discriminators' outputs is required to further improve this accuracy. Measurements of pulses with phase and frequency modulation present have demonstrated the potential for the identification of these modulation schemes.

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Reflectionless Filter Topologies

Morgan

2019

Wiley Encyclopedia of Electrical and Electronics Engineering

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Reflectionless filters are a class of lumped‐element circuits and transmission‐line topologies which, insofar as the elements are ideal, have identically zero reflection coefficients at all ports and at all frequencies from DC to infinity. Developed in the mid 2010's, they differ from previous first‐ and second‐order constant‐resistance implementations in that complex filter responses of arbitrarily high order may be realized without any excess flat loss in the pass‐band. Such filters find considerable use in systems applications where adjoining components may be sensitive to reactive terminations out‐of‐band. While most components are characterized in the lab with broadband, matched terminations (e.g., ) on all of their ports, this is not always representative of the embedding impedances they will see in real systems. Reflectionless filters provide a means of reproducing the laboratory impedance environment for sensitive components while filtering the frequency spectrum and limiting out‐of‐band interactions between functional blocks. Whereas conventional filters can only block unwanted signals from passing, reflectionless filters remove them from the system by dissipation.

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Reflectionless Filter Structures

Cited by 123 publications

References 4 publications

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

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

A Miniaturized Delay-Line Discriminator

Reflectionless Filter Topologies

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