Document Type

Article

Rights

This item is available under a Creative Commons License for non-commercial use only

Disciplines

2.2 ELECTRICAL, ELECTRONIC, INFORMATION ENGINEERING, Communication engineering and systems

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

Abstract

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.

DOI

10.1049/el.2014.0874

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