Intermodulation Distortion in Coupled-Resonator Filters With Nonuniformly Distributed Nonlinear Properties—Use in HTS IMD Compensation

Mateu, Jordi; Booth, James C.; Collado, C.; O'Callaghan, J.M.

doi:10.1109/tmtt.2007.892802

Cited by 16 publications

(9 citation statements)

References 21 publications

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“…Nonlinearity is a key consideration in a wide range of important applications including amplifiers [1][2][3] and tunable filters [4]. Introduction of nonlinearity into metamaterials facilitates tunability, design flexibility, and self-induced nonlinear responses [5,6], giving rise to developments in metamaterial-based amplifiers [7,8] , filters [9][10][11] and antennas [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Intermodulation in nonlinear SQUID metamaterials: Experiment and theory

et al. 2016

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The response of nonlinear metamaterials and superconducting electronics to two-tone excitation is critical for understanding their use as low-noise amplifiers and tunable filters. A new setting for such studies is that of metamaterials made of radio frequency superconducting quantum interference devices (rf-SQUIDs). The two-tone response of self-resonant rf-SQUID meta-atoms and metamaterials is studied here via intermodulation (IM) measurement over a broad range of tone frequencies and tone powers. A sharp onset followed by a surprising strongly suppressed IM region near the resonance is observed. Using a two time scale analysis technique, we present an analytical theory that successfully explains our experimental observations. The theory predicts that the IM can be manipulated with tone power, center frequency, frequency difference between the two tones, and temperature. This quantitative understanding potentially allows for the design of rf-SQUID metamaterials with either very low or very high IM response.

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Section: Introductionmentioning

confidence: 99%

Intermodulation in nonlinear SQUID metamaterials: Experiment and theory

et al. 2016

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“…Therefore, we may expect a variation of the resonant frequency and reduction in for the resonators in the filter as the current density increases. The quantification of the detuning and reduction can be obtained by means of modeling the nonlinear distributed effects of the superconducting resonators [9]- [13].…”

Section: Practical Considerations On the Implementation Of A Supementioning

confidence: 99%

Superconducting Multiplexer Filter Bank for a Frequency-Selective Power Limiter

Rocas

Padilla

Mateu

et al. 2011

IEEE Trans. Appl. Supercond.

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Abstract-This work proposes a superconducting multiplexer filter bank configuration to be used as a frequency-selective power limiter. The proposed configuration limits narrowband high-power signals within a single frequency band without degrading the signal performance in the rest of the frequency bands. To accomplish this, we need to calculate the limiting power of superconducting filters implemented by means of half-wavelength transmission line resonators. The limiting power is obtained as a function of the resonator geometry, filter bandwidth, and filter order. Practical issues occurring in superconducting filters operating at high power, such as the reduction of the quality factors and de-tuning, are also analyzed and shown to not adversely affect the overall multiplexer power limiter performance.

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“…When that is done, (1) and (2) can be used to find the cancellation conditions for simple cases of cascading purely HTS and ferroelectric segments. General topologies with nonuniform distributed nonlinear effects were analyzed in [9]. Here we consider the case of cascading a ferroelectric segment of length with an HTS segment of length .…”

Section: Analytical Expressions For Compensationmentioning

confidence: 99%

“…Here we consider the case of cascading a ferroelectric segment of length with an HTS segment of length . The cancellation condition results in [9] (3)…”

Section: Analytical Expressions For Compensationmentioning

confidence: 99%

Nonlinear Response of Combined Superconductor/Ferroelectric Devices: First Experimental Step

Mateu

Booth

Moeckly

2007

IEEE Trans. Appl. Supercond.

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Superconducting thin films are known to possess a nonlinear response at microwave frequencies. These nonlinear effects can be described quantitatively by a nonlinear inductance, and for high-Tc superconductors, are believed to be an intrinsic consequence of d-wave superconductivity. Similar nonlinear effects can be observed in ferroelectric materials, such as SrTiO 3 . We experimentally explore the interaction between nonlinear effects of different character arising from these two different origins. We consider a number of different device configurations, and measure the generation of harmonic and intermodulation products as function of temperature, in order to assess how these two different types of nonlinear response would interact in devices fabricated from both types of nonlinear materials. We use these measurements to assess whether nonlinear effects in high-Tc superconductor devices may be mitigated by some form of active cancellation. Effects of the ferroelectric losses are also discussed.

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Intermodulation Distortion in Coupled-Resonator Filters With Nonuniformly Distributed Nonlinear Properties—Use in HTS IMD Compensation

Cited by 16 publications

References 21 publications

Intermodulation in nonlinear SQUID metamaterials: Experiment and theory

Intermodulation in nonlinear SQUID metamaterials: Experiment and theory

Superconducting Multiplexer Filter Bank for a Frequency-Selective Power Limiter

Nonlinear Response of Combined Superconductor/Ferroelectric Devices: First Experimental Step

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