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Tunable microwave filters based on discrete ferroelectric and semiconductor varactors

Tunable microwave filters based on discrete ferroelectric and semiconductor varactors

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  • Author(s): X. Wang 1, 2 ; P. Bao 1, 3 ; T.J. Jackson 1 ; M.J. Lancaster 1
    • View affiliations
    • Affiliations: 1: School of Electronic, Electrical and Computer Engineering, University of Birmingham, Birmingham, UK
      2: School of Electronic, Electrical and Computer Engineering, Chinese Academy of Sciences, National Laboratory for Superconductivity, Institute of Physics,, Beijing, People's Republic of China
      3: School of Physics and Astronomy, University of Leeds, Leeds, UK
  • Source: Volume 5, Issue 7, 13 May 2011, p. 776 – 782
    DOI:  10.1049/iet-map.2010.0417 , Print ISSN 1751-8725, Online ISSN 1751-8733
© The Institution of Engineering and Technology
Published

This study presents a direct comparison between semiconductor and barium strontium titanate (BST) tuning technologies. Tapped line combline two-pole and four-pole bandpass filters were designed in a coplanar waveguide configuration. Discrete BST interdigital capacitors were fabricated and integrated into the filter circuits in a hybrid manner. The BST varactors performed as tuning elements in the filters. The same filter was also made using gallium arsenide (GaAs) varactors and the tuning and loss performance were compared with the BST filters. The centre frequency of the two-pole BST filter tuned 30.3% from 1.55 to 2.02 GHz with insertion loss ranging from 3.7 to 1.1 dB, at an electric field of 6.5 V/µm. This filter has a figure of merit of 0.87 dB−1. The two-pole GaAs filter showed a wide tuning range from 0.94 to 2.44 GHz at 14 V with insertion loss ranging from 4.2 to 0.8 dB. The results are discussed in detail, as it is important to clarify the comparison with relation to the quality of the materials, as well as the particular filter designs and centre frequencies involved.

Inspec keywords: band-pass filters; coplanar waveguides; microwave filters; varactors

Other keywords: discrete BST interdigital capacitors; semiconductor varactors; insertion loss; tuning elements; two-pole GaAs filter; electric field; BST varactors; gallium arsenide varactors; discrete ferroelectric varactors; tunable microwave filters; filter circuits; barium strontium titanate tuning bandpass filters; two-pole BST filter; coplanar waveguide configuration

Subjects: Capacitors; Waveguides and microwave transmission lines; Junction and barrier diodes; Filters and other networks; Waveguide and microwave transmission line components

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