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Superconducting microstrip bandpass filter on LaAlO/sub 3/ with high out-of-band rejection

机译:LaAlO / sub 3 /上的超导微带通滤波器,带外抑制率高

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A superconducting eight-pole narrow-band filter on lanthanum aluminate substrate material (/spl epsi//sub r//spl ap/4) is introduced. The filter has a center frequency of 1.8 GHz and a fractional bandwidth of 0.84%. Steep filter skirts (/spl sim/20 dB at 700 kHz) and high out-of-band rejection (/spl sim/60 dB at 5 MHz) have been achieved by a quasi-elliptic filter design with two transmission zero pairs. The measured high-quality factor of /spl sim/60 000 at 70 K results in an insertion loss of less than /spl sim/0.3 dB in the passband and /spl sim/0.5 dB at the band edges.
机译:介绍了一种在铝酸镧衬底材料(/ spl epsi // sub r // spl ap / 4)上的超导八极窄带滤波器。该滤波器的中心频率为1.8 GHz,分数带宽为0.84%。通过具有两个传输零对的准椭圆滤波器设计,实现了陡峭的滤波器裙边(/ spl sim / 20 dB,在700 kHz时)和高带外抑制(/ spl sim / 60 dB,在5 MHz时)。在70 K时测得的/ spl sim / 60000高质量因子导致通带的插入损耗小于/ spl sim / 0.3 dB,在频带边缘的插入损耗小于/ spl sim / 0.5 dB。

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