HTS filter subsystems for wireless telecommunications

Willemsen, Balam A.

doi:10.1109/77.919285

Cited by 65 publications

(27 citation statements)

References 29 publications

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“…[1]. The low insertion loss and sharp skirts are one of the most important characteristics of superconducting filters and their values depend on the surface resistance of the HTS thin films used.…”

Section: Introductionmentioning

confidence: 99%

Surface resistance measurements of HTS thin films using SLAO dielectric resonator

Jacob

Mazierska

Leong

et al. 2003

IEEE Trans. Appl. Supercond.

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Surface resistance of HTS films is typically measured using Sapphire dielectric rod resonators enclosed in a copper cavity. In this paper we present surface resistance measurements of YBa 2 Cu 3 O 7 films using Strontium Lanthanum Aluminate (SLAO) at a resonant frequency of 18.2 GHz. We have performed the error analysis of the cavity loaded with SLAO dielectric rod and also verification measurements using two Sapphire (Al 2 O 3 ) rod resonators operating at resonant frequencies of 24.6 GHz and 10 GHz respectively. Good agreement between the values of of two sets of YBCO films measured using the SLAO and the Sapphire dielectrics has been obtained after a frequency scaling of was applied. Using different dielectric rods of the same size in the same cavity for measurements of of HTS films it is feasible to do microwave characterization of the same films at differing frequencies.Index Terms-Dielectric resonator, high temperature superconductor, surface resistance.

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Section: Introductionmentioning

confidence: 99%

Surface resistance measurements of HTS thin films using SLAO dielectric resonator

Jacob

Mazierska

Leong

et al. 2003

IEEE Trans. Appl. Supercond.

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“…These attractive performances are of great help to improve the sensitivity and selectivity of communication systems, such as wireless and satellite communications [1][2][3][4][5]. However, the measured responses of HTS filters usually deviate from the designed results due to the fabrication errors and the variations of the substrate properties [6 -8].…”

Section: Introductionmentioning

confidence: 99%

Accurate design of a compact superconducting microstrip filter

Peng

Guo

Jin

et al. 2008

Micro & Optical Tech Letters

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This article presents a six‐pole high‐temperature superconducting (HTS) filter at 2.5 GHz with a compact size of 10 mm × 15 mm on MgO substrate. Twin‐spiral resonators with high simulation accuracy are used in the design procedure. EM simulations verify that the filter response is insensitive to the variations of the cell sizes and the substrate parameters. The untuned measurement of the HTS filter at 70 K shows a high performance. The minimum return loss is 14.7 dB without any tuning. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 141–144, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24018

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“…This is because the usual band pass filter failed to distinguish the frequency bands of the companies. It was found that the quality of speech in mobile-phones was improved significantly by using an HTS filter and superconducting base stations have spread rapidly in the United States [11][12]. Although the use of a superconducting bandpass filters was also studied in the third generation wireless communication system IMT-2000 [13][14][15][16], unfortunately, the superconducting bandpass filter system was not adopted because of its high price…”

Section: Superconducting Bandpass Filters For Wireless Communicationmentioning

confidence: 99%

A Thirty-year History of Superconducting Microwave Devices and Fundamental Studies Thereof

Ohshima

2018

J. Phys.: Conf. Ser.

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Abstract. Thirty years have passed since the discovery of high-temperature superconductors (HTS), and practical applications of HTS equipment and devices are moving into full-swing. From the beginning of their discovery, the use of HTS in microwave devices has been recognized as one of their most practical applications. This is because the surface resistance of HTS is about 1/1000 of that of pure copper at 1 GHz and 77 K. From early on, researchers have recognized that high performance of microwave passive devices could be realized by utilizing the characteristics of HTS. In addition, the size of HTS microwave devices is relatively small, and they can be cooled by a small cryocooler. Furthermore, we were able to establish high-quality HTS thin-film fabrication technology essential for producing high performance microwave devices in a short period of time. In view of the above, I would like to present an overview of the past thirty years of superconducting microwave devices and fundamental studies thereof.

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HTS filter subsystems for wireless telecommunications

Cited by 65 publications

References 29 publications

Surface resistance measurements of HTS thin films using SLAO dielectric resonator

Surface resistance measurements of HTS thin films using SLAO dielectric resonator

Accurate design of a compact superconducting microstrip filter

A Thirty-year History of Superconducting Microwave Devices and Fundamental Studies Thereof

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