Green Function

Huang, Jing

doi:10.5772/68028

Cited by 1 publication

(1 citation statement)

References 32 publications

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“…The FF data were generated by numerically propagating the NF data with the well-known scalar Green's function (such as described in Eqn 10.16 of [ 16 ]) to give the fields at a rectangular grid of 200 by 200 points lying on a two-dimensional planar surface 5 m away along the boresight, of overall lateral dimension 2.5 m by 2.5 m. The two-dimensional NF data are sufficient owing to the directional nature of the antenna, and for our scanner, it is impossible to measure fields on all sides of an enclosing volume in any case. The complex FF data at each point r is calculated by taking a sum of the contribution from all the sources in the near field at positions

as follows [ 17 ]:

where m is the m th x -position index, n is the n th y -position index and k = 2 · π / λ is the wavenumber. The calculation is repeated separately for each frequency.…”

Section: Measurement System and Methodologymentioning

confidence: 99%

Experimental evaluation of spectral efficiency from a circular array antenna producing a Laguerre–Gauss mode

2020

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We present the four-dimensional volumetric electromagnetic field measurements ( x , y , z and frequency) of the complex radiated field produced by an 8-element circular antenna array. The array is designed to produce a Laguerre–Gauss (LG) mode l = +1 over the frequency range of 9–10 GHz. We evaluate our findings in terms of far-field LG mode purity and spectral efficiency in terms of the quadrature amplitude modulation (QAM) modulation scheme that can be supported. The application of LG modes in radio systems is as a means of multiplexing several data streams onto the same frequency, polarization and time slot, thus making a highly spectrally efficient transmission system or enhancing radar systems by means of exploiting mode behaviour as an additional degree of freedom. Our results show that for the circular antenna array, we find that mode purity is sufficient to support binary phase shift keying or quadrature phase shift keying modulation over a 0.3 GHz bandwidth, which corresponds to a spectral efficiency of 1.5 b s −1 Hz −1 per mode. Closer to the antennas' design frequency, 256QAM modulation may be supported over a 0.05 GHz band, and which corresponds to a spectral efficiency of 11 b s −1 Hz −1 per mode. We anticipate the practical insights provided in this paper contribute to the successful design of such systems.

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as follows [ 17 ]:

where m is the m th x -position index, n is the n th y -position index and k = 2 · π / λ is the wavenumber. The calculation is repeated separately for each frequency.…”

Section: Measurement System and Methodologymentioning

confidence: 99%