X-band and Ka-band tunable devices using low-loss BST ferroelectric capacitors
| Autor: | John Papapolymerou, Zhiyong Zhao, Kwang Choi, Stanis Courreges, Andrew T. Hunt |
|---|---|
| Přispěvatelé: | MINACOM, XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS), n-Gimat Inc., School of Electrical and Computer Engineering - Georgia Insitute of Technology (ECE GeorgiaTech), Georgia Institute of Technology [Atlanta], Guillat, Marie-Laure |
| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
Materials science
business.industry X band 020206 networking & telecommunications Biasing 02 engineering and technology 021001 nanoscience & nanotechnology law.invention Capacitor Band-pass filter law 0202 electrical engineering electronic engineering information engineering Figure of merit Insertion loss Optoelectronics Ka band 0210 nano-technology business Phase shift module ComputingMilieux_MISCELLANEOUS |
| Zdroj: | IEEE 18th International Symposium on Applications of Ferroelectrics IEEE 18th International Symposium on Applications of Ferroelectrics, Aug 2009, Xi'an, China Applications of Ferroelectrics Applications of Ferroelectrics, 2009, ⟨10.1109/ISAF.2009.5307566⟩ |
| DOI: | 10.1109/ISAF.2009.5307566⟩ |
| Popis: | This paper presents tunable filters and phase shifters using low-loss ferroelectric BST (Barium Strontium Titanate) capacitors. Optimization of the BST varactors has resulted in phase shifters and tunable filters with practically usable performances. Two X-band filters, A and B, exhibit insertion loss of 7 dB – 4.1 dB and 14.9 % tuning, and 7.7 dB – 4.7 dB and 19.5% tuning, respectively, when a bias voltage of 0 V to 30 V is applied. A sharp roll-off with excellent out-of-band rejection was achieved on both filters. A Ka-band bandpass filter has a frequency tuning of 17% at a bias voltage of 30 V and a good insertion loss between 6.5 dB and 2.5 dB, comparable with the ones using MEMS technologies at these frequencies. A 35 GHz phase shifter showed an insertion loss of 7 dB with no bias, which improved to below 4 dB when biased at 30 V. The figure of merit is 55 deg/dB. All circuits present good performances in X-band and Ka-band. The measured results of these microwave tunable ferroelectric devices are presented. |
| Databáze: | OpenAIRE |
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