A 15-pole high temperature superconductor filter for radar applications. (2nd May 2018)

• Record Type: Journal Article
• Authors: Yu, Xiao; Xi, Weibin; Wu, Songtao
• Is Part Of: Superconductor science & technology. Volume 31:Number 6(2018:Jun.)
• Publication Date: 2018-05-02
• Subjects: HTS filter -- high selective -- high first harmonic frequency -- interdigital structure resonator; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/1361-6668/aabbf5
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: This paper presents a compact and high first harmonic frequency resonator. The characteristics of this resonator are theoretically analyzed. A highly selective 15-pole Chebyshev high temperature superconducting ultra-high frequency narrowband filter for radar applications was fabricated by using this resonator. The filter has a center frequency of 495 MHz and a fractional bandwidth of 1%. The first harmonic frequency is more than 3.3 times the fundamental frequency. The measured filter shows excellent selectivity, better than 85 dB/1 MHz skirt slopes, and more than 85 dB of rejection at 497.5 MHz from the band edge. The filter was fabricated on a 2 inch YBCO thin film with a 0.5 mm thick MgO substrate. The experimental results are consistent with the simulations.