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Generation of arbitrary polarisation in any direction by cross dipole

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3 Author(s)
Marhic, M.E. ; Coll. of Eng., Swansea Univ., Swansea, UK ; Mehta, A. ; Pal, A.

The authors show that a wave with any desired polarisation state can generally be generated in any direction with respect to two crossed dipoles, and a closed-form expression is provided for the complex ratio of the required drive voltages. The authors also provide a simple projection method for the polarisation ellipse in the case where the dipole centres coincide. For achieving the authors' aim of exploiting closed-form equations to generate circularly polarised (CP)/elliptically polarised (EP)/linearly polarised in any direction, two orthogonally placed dipoles resonating at 1 GHz each are designed. By selecting complex feed solutions, which are provided from the proposed closed-form equations, it is realised precise polarisation states in a number of directions. Four separate such cases to generated CP and EP were investigated, and in all of them the numerical simulations and experiments validated the proposed theoretical predictions.

Published in:

Microwaves, Antennas & Propagation, IET  (Volume:7 ,  Issue: 12 )

Date of Publication:

Sept. 17 2013

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