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Superconducting compact coplanar waveguide filters based on quarter-wavelength spiral resonators with suppressed slot-line mode

Javadzadeh, S. M. H ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1080/02726343.2014.846164
  3. Abstract:
  4. Quarter-wavelength superconducting spiral resonators have been used to realize a coplanar waveguide bandpass filter and bandstop filter around the center frequency of 6 GHz. These compact coplanar waveguide filters have been made from 300-nm-thick NbTiN thin film on a 525-μm-thick silicon substrate. The bandpass filter is a six-pole Chebyshev filter with two zero transmissions due to nonadjacent coupling in its structure. Accurately microfabricated air-bridges have been used to suppress the undesired slot-line mode in this filter. The bandstop filter is a very simple two-pole structure that used wire bonding to suppress the slot-line mode. Measurements have been done at a temperature of 4.2 K in liquid helium. Good agreement between simulation and measurement results has been found
  5. Keywords:
  6. Compact microwave filter ; Coplanar waveguide filters ; Slot-line mode suppressed ; Spiral resonators ; Superconducting filters ; Center frequency ; Quarter-wavelength ; Silicon substrates ; Simulations and measurements ; Two-pole structure ; Circular waveguides ; Coplanar waveguides ; IIR filters ; Liquefied gases ; Microwave filters ; Notch filters ; Poles ; Resonators ; Superconducting resonators ; Superconductivity ; Superfluid helium ; Waveguide filters
  7. Source: Electromagnetics ; Volume 34, Issue 1 , 2 January , 2014 , Pages 12-18 ; ISSN: 02726343
  8. URL: http://www.tandfonline.com/doi/abs/10.1080/02726343.2014.846164#.VcrV67U1rcs