A self-equalized HTS filter for future mobile communication applications

✍ Scribed by T. Zuo; L. Fang; Z.Z. Wu; T.G. Zhou; L. Ji; Q.L. Xie; X. Zhang; S.L. Yan; X.J. Zhao; X. Zuo

• Book ID: 104083188
• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 223 KB
• Volume: 459
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2007.03.396

✦ Synopsis

A 10-pole self-equalized high-temperature superconducting (HTS) filter is presented in this paper. The filter has a fractional bandwidth of 0.51% at 1955 MHz, simulated in Sonnet, and is fabricated using double-sided Tl 2 Ba 2 CaCu 2 O 8 film on 0.5 mm thick LaAlO 3 substrates. The filter consists of 10 novel quasi-lumped resonators and an additional microstrip which is used to realize the real-axis transmission zeros (TZs). The simulated group delay ripple over the central 55% of the filter's passband is 5.6 ns, and a close result of phase response is achieved in laboratory test. The measured insertion loss of the filter is less than 0.2 dB, the out-of-band rejection is better than 75 dB and the slope is better than 22 dB MHz À1 at band edge.