Cameron, R. P.Loffler, W.Stephan, Karl D.2021-08-242021-08-242021-05Cameron, R. P., Löffler, W., & Stephan, K. D. (2021). Theoretical proposal for the experimental realisation of a monochromatic electromagnetic knot. Journal of Optics, 23, 06.2040-8986https://hdl.handle.net/10877/14443We propose an antenna designed to generate monochromatic electromagnetic knots and other 'unusual electromagnetic disturbances' in the microwave domain. Our antenna is a spherical array of radiating dipolar elements configured to approximate the desired electromagnetic field near its centre. We show numerically that a specific embodiment of the antenna with a radius of 61.2 cm and only 20 element pairs driven at a frequency of 2.45 GHz can yield linked and torus-knotted electric and magnetic field lines approximating those of an 'electromagnetic tangle': a monochromatic electromagnetic knot closely related to the well-known Rañada–Hopf type electromagnetic knots but simpler in its construction. The antenna could be used to locally excite plasmas.Text7 pages1 file (.pdf)enelectromagnetic knotsmicrowavesantenna theoryIngram School of EngineeringArticle© 2021 The Author(s).https://doi.org/10.1088/2040-8986/abfc33This work is licensed under a Creative Commons Attribution 4.0 International License.