The Observable Field for Antennas in Reception

The Observable Field for Antennas in Reception

Neto, A. (TU Delft Tera-Hertz Sensing)
Llombart, Nuria (TU Delft Tera-Hertz Sensing)
Freni, Angelo (University of Florence)

2018

In this paper, the portion of the incident field that can be received by an antenna is investigated: the observable field. This field can be estimated relying only on the volume allocated to the antenna and thus independently of the specific antenna geometry. The observable field is composed by a single spherical wave that first converges into the origin and then diverges to infinity. The power associated with the converging wave is the power available to an antenna located within the defined volume. Previously, an estimation of this observable spherical wave was obtained by truncating the spectral spherical modal series representation of the incident field. Here, instead, we provide more applicable approximation of the observable field, by truncating a spatial integral representation of the incident field that is based on the use of equivalent ideal currents. Eventually, for the vast majority of antennas, the estimation of the available power that can be obtained by approximating the observable field via the ideal currents is more accurate than the estimation that would be obtained via the spectral modal expansion. Moreover, analytical expressions for the observable field are provided here. The ideas are set here considering the case of single plane wave incidence, but the extension to multiple plane waves is straightforward.

Antenna theory
equivalence theorem
receiving antennas
spherical modes

http://resolver.tudelft.nl/uuid:0ad2985a-c486-4179-a30b-0c1d64cd1b5d

https://doi.org/10.1109/TAP.2018.2809427

0018-926X

IEEE Transactions on Antennas and Propagation, 66 (4), 1736-1746

Accepted Author Manuscript

Institutional Repository

journal article

© 2018 A. Neto, Nuria Llombart, Angelo Freni