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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Mueller, S. Felber, C. Scheele, P. Wittek, M. Hock, C. Jakoby, R. |
| Copyright Year | 2005 |
| Description | Author affiliation: Inst. fur Hochfrequenztechnik, Technische Univ. Darmstadt, Germany (Mueller, S.; Felber, C.; Scheele, P.) |
| Abstract | In this paper, the investigation of a finline based phase shifter device filled with liquid crystal, fed by a standard rectangular Ka-band waveguide, is described. A broadband transition from waveguide to antipodal finline is investigated and optimized, leading to an insertion loss of below 1.7 dB of the back-to-back transition. An antipodal finline transmission line filled with liquid crystal between its overlapping conductors is used as a phase shifter. Two different liquid crystals are investigated: K15 as a quasi-standard and MDA-03-2838 as a novel mixture with a steeply increased dielectric anisotropy and reduced losses compared to K15. At 40 GHz, a phase shift of 75/spl deg/ arises in connection with 8dB insertion loss for K15 whereas the phase shift of MDA-03-2838 amounts to 303/spl deg/ and 4.8 dB insertion loss, all measured at room temperature. Additionally, the response times of the phase shifter device are investigated for both liquid crystals. |
| File Size | 598467 |
| File Format | |
| ISBN | 2960055128 |
| DOI | 10.1109/EUMC.2005.1608852 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2005-10-04 |
| Publisher Place | France |
| Access Restriction | Subscribed |
| Rights Holder | EUROPEAN MICROWAVE ASSOCIATION |
| Subject Keyword | Liquid crystals Finline Phase shifters Liquid crystal devices Insertion loss Dielectric loss measurement Dielectric losses Temperature measurement Liquid waveguides Rectangular waveguides |
| Content Type | Text |
| Resource Type | Article |
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