Tunable RF Filters Based on Liquid Crystal for Space Applications

Author:

Kaesser Tobias,Fritzsch Carsten,Franz Michael

Abstract

On board of communication satellites, there are numerous RF filters in the payload used for guiding wanted signals as desired and for rejecting unwanted signals such as not to interfere with wanted signals. At present, satellites have a long lifetime (15 years at least for a typical geostationary communication satellite) and there is also time elapsing between its design and the start of in-orbit service (2 years at least). On the other hand, conventional RF filters for satellite applications are fixed frequency. Therefore, there is a growing demand for in-orbit tunable filters to be able to cope with changes in the market situation during that long time. Also, there are communication systems evolving that rely on tunable devices used for adaptive filtering or steering. This article reports on in-orbit tunable bandpass filters employing liquid crystal material and operating at 20 GHz, and especially on design aspects dealing with the harsh space environment, on the operating principles for commanding the filters on board the satellite, and on a qualification campaign passed successfully. A demonstrator unit is in manufacturing for in-orbit verification.

Publisher

MDPI AG

Subject

Inorganic Chemistry,Condensed Matter Physics,General Materials Science,General Chemical Engineering

Reference12 articles.

1. https://www.esa.int/Applications/Telecommunications_Integrated_Applications/Satellite_frequency_bands

2. Microwave Filters for Communication Systems;Cameron,2018

3. Birefringence dispersions of liquid crystals

4. Liquid crystal microwave phase shifter

5. Liquid crystal millimeter wave electronic phase shifter

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