Three-tone intermodulation distortion generated by superconducting bandpass filters

Using a near-field microwave technique, twodimensional images have been made of the second and third order intermodulation distortion (IMD) of Tl 2 Ba 2 CaCu 2 O 8 and YBa 2 Cu 3 O 7 thin film microwave resonators. It was found that second and third order IMD do not have identical spatial distributions, which indicates that physical mechanisms play different roles in their generation. This technique enables the investigation of the roles of these mechanisms. As an illustration, the sensitivity to magnetic fluxons of the two orders is described, with second order being more sensitive to fluxon density. 

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“…Details of the measurement are provided in Refs. [15,16]. Briefly, the sample is driven at its resonant frequency f 3 .…”

Section: A Intermodulation Distortionmentioning

confidence: 99%

Local Whole-Device Scanning of Distortion in Superconducting Microwave Resonators

Remillard

Wormmeester

Huizen

2018

IEEE Trans. Appl. Supercond.

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“…1) IMD Distortion: To assess the power-handling capability of the filter as a front-end component in the receive chain of wireless base stations, third-order IMD distortion was measured [8], [21], [22]. Fig.…”

Section: A Sensitivity Analysismentioning

confidence: 99%

Compact parallel coupled HTS microstrip bandpass filters for wireless communications

Pal

Stevens

Edwards

2006

IEEE Trans. Microwave Theory Techn.

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A practical design methodology for a compact parallel-coupled microstrip bandpass filter structure with steep attenuation is introduced using a computer-aided full-wave electromagnetic (EM) simulation based on the method of moments. The structure consists of an array of fully aligned half-wavelength spiral-meander-line resonators. Aimed at the application in the front-end receiver of digital cellular communication service, a 12-pole high-temperature superconductor filter with 2.27% fractional bandwidth (FBW) at 883.0 MHz was designed. In order to utilize the limited wafer area further, a 15-pole filter with 803.0-MHz center frequency, 2.25% FBW is precisely designed with greater EM simulation effort. Both the filters are fabricated using thallium-barium-calcium-copper-oxide thin films on a 2-in lanthanum-aluminate (LaAlO 3 ) wafer. The -parameter measurements show a good agreement with the simulated results. At 70 K, the 12-pole filter shows less than 0.4-dB insertion loss, 0.3-dB passband ripple, and better than 12-dB return loss, and the 15-pole filter shows 0.25-dB insertion loss, 0.2-dB passband ripple, and better than 15-dB return loss. Out-of-band rejection for both the filters at 3 MHz below the passband edges is more than 60.0 dB. In order to estimate the power-handling capability of the filters, third-order intermodulation distortion was measured.A sensitivity analysis for the observed frequency shift in the filters is reported, which also shows very similar parametric dependence in both the filters. Also from this analysis, an approach for using the same deign in 0.5% FBW applications is discussed.Index Terms-Base transceivers in digital cellular communication, electromagnetic (EM) simulation, high-temperature superconductor (HTS), method of moments, microstrip filters.

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“…To assess the power handling capability of the filter as a front end component in the receive chain of wireless base stations, thirdorder intermodulation distortion was measured [7]. Figure 8 shows intermodulation product (IMP) at 826 MHz from in-band two-tone fundamental signals, 816 MHz and 821 MHz.…”

Section: Intermodulation Distortionmentioning

confidence: 99%

“…Microwave filters developed from materials exhibiting some nonlinearity, such as superconductors, will generate intermodulation distortion, thereby limits the power handling capability of the filter [1]. With respect to all these issues, various designs of microstrip bandpass filters have been studied [2][3][4][5][6][7]. It is known that with respect to selectivity performance, the filter topology with chebyshev response is not as good as advanced quasi-elliptic filter topologies.…”

Section: Introductionmentioning

confidence: 99%

Design and experimental results of 15 pole spiral meander line HTS filter and its two tone distortion measurement

Pal¹

2006

Micro & Optical Tech Letters

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Three-tone intermodulation distortion generated by superconducting bandpass filters

Cited by 20 publications

References 10 publications

Local Whole-Device Scanning of Distortion in Superconducting Microwave Resonators

Local Whole-Device Scanning of Distortion in Superconducting Microwave Resonators

Compact parallel coupled HTS microstrip bandpass filters for wireless communications

Design and experimental results of 15 pole spiral meander line HTS filter and its two tone distortion measurement

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