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

Pal, Srikanta

doi:10.1002/mop.21954

Cited by 1 publication

(3 citation statements)

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“…The intersection point of reference lines with slope 1 (for the fundamental signal) and slope 3 (for the IMP) gives the third order intercept point (IP3). The IP3 of the 12 pole filter was measured to be about 37.9 dBm at 70 K. The measured value of IP3 for the 12-pole filter is better than that reported in [9].…”

Section: Intermodulation Distortionmentioning

confidence: 51%

“…In order to fabricate a tuning-free practical filter a sensitivity analysis is very important, mainly because of fabrication errors [6,7,9]. Among several possible sources of errors, the thickness of the substrate is realized to be the main source.…”

Section: Sensitivity Analysismentioning

confidence: 99%

“…With respect to all these issues, various designs of microstrip bandpass filters have been studied [1,[5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. 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%

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A compact, higher order, high temperature superconductor microstrip bandpass filter on a two-inch lanthanum aluminate substrate for personal communication service applications

Pal¹,

Stevens²,

Edwards³

2005

Supercond. Sci. Technol.

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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 simulation based on the method of moments. The structure consists of an array of fully aligned half-wavelength spiral meander line resonators. Aimed at application in the front-end receiver of digital cellular communication service, a 12-pole high temperature superconductor filter with 2.27% fractional bandwidth at 883.0 MHz was designed. The filter is fabricated using thallium–barium–calcium–copper oxide (TBCCO) thin films on a two-inch lanthanum aluminate (LaAlO3) wafer. The S-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, better than 12 dB return loss. The out of band rejection at 3 MHz below the passband edges is more than 60.0 dB. In order to estimate the power handling capability of the filter, the third-order intermodulation distortion was measured. A sensitivity analysis for the observed frequency shift in the filter is reported. Also from this analysis an approach for using the same design in 0.5% FBW applications is discussed.

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Section: Intermodulation Distortionmentioning

confidence: 51%

Section: Sensitivity Analysismentioning

confidence: 99%