Document Type



Available under a Creative Commons Attribution Non-Commercial Share Alike 4.0 International Licence

Publication Details

Source: Electronics Letters, Volume 50, Issue 11, 22 May 2014, p. 788 – 790 DOI: 10.1049/el.2014.0874 , Print ISSN 0013-5194, Online ISSN 1350-911X


This paper introduces a novel concept of frequency-independent variable phase-shifters. It is based on the use of circularly polarized (CP) antennas coupled in the near-field. For transmission between two CP antennas in the far-field, a rotation around the boresight axis produces a phase change in the transfer function. This concept is exploited and validated also for near-field coupling between two CP antennas. Therefore, two close-coupled CP antennas can act as a adjustable phase-shifter with the phase-shift controlled by the angle between the structures. The bandwidth depends on the CP bandwidth of the antenna. This concept is valuable for future phase-shifters in mm-wave applications where rotation can be facilitated by MEMS elements.



Irish Research Council, Science Foundation Ireland, and Cost Vista EU