Abstract
Ferroelectric materials like Barium-Strontium-Titanate (BST) have become attractive for microwave tunable circuit applications. This letter presents an investigation of BST-varactor tunable dual-mode filter using variable characteristic impedance or ZC transmission line. The interdigital BST varactors are fabricated and modeled, which are then deployed to realize a bandpass filter with tunable bandwidth capability. The use of tunable impedance line provides additional flexibilities in the design of microwave tunable circuits. A tunable bandpass filter of this type with a center frequency of 1.8 GHz and a bandwidth tuning ratio of 1.15:1 is demonstrated experimentally. © 2008 IEEE.
Original language | English |
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Article number | 4457814 |
Pages (from-to) | 167-169 |
Number of pages | 3 |
Journal | IEEE Microwave and Wireless Components Letters |
Volume | 18 |
Issue number | 3 |
DOIs | |
Publication status | Published - Mar 2008 |
Keywords
- Barium-strontium-titanate (BST)
- Dual mode filter
- Ferroelectric material
- Tunable circuit
- Tunable filter
- Varactor