In this work, an original closed-form approximate evaluation is performed for the continuous-spectrum field excited by a dipole source in substrate-superstrate configurations, often employed in planar antennas and integrated passive components. By extending a recently-developed asymptotic approach, previously applied to the one-dimensional TE case of a line-source excitation, we first derive a suitable closed-form expression for the residual-wave field: this allows us to represent the continuous-spectrum field also in the neighbourhood of the transition region between leaky-wave and bound-wave ranges in the form of angular-dependent cylindrical leaky waves of TE or TM type, weighted by an appropriate transition function. The proposed formulation makes clear in a simple way the characteristics of the continuous-spectrum field excited by practical sources. Numerical results which show the accuracy of this approach are provided for different configurations and frequency ranges.
Baccarelli, P., Galli, A. (2002). Representation of the continuous spectrum excited by a dipole in a multilayer configuration through weighted cylindrical leaky waves. In Proceedings 32nd European Microwave Conference 2002 (pp.645-648). NEW YORK : IEEE, 345 E 47TH ST, NEW YORK, NY 10017 USA [10.1109/EUMA.2002.339367].
Representation of the continuous spectrum excited by a dipole in a multilayer configuration through weighted cylindrical leaky waves
BACCARELLI, PAOLO;GALLI, ALESSANDRO
2002-01-01
Abstract
In this work, an original closed-form approximate evaluation is performed for the continuous-spectrum field excited by a dipole source in substrate-superstrate configurations, often employed in planar antennas and integrated passive components. By extending a recently-developed asymptotic approach, previously applied to the one-dimensional TE case of a line-source excitation, we first derive a suitable closed-form expression for the residual-wave field: this allows us to represent the continuous-spectrum field also in the neighbourhood of the transition region between leaky-wave and bound-wave ranges in the form of angular-dependent cylindrical leaky waves of TE or TM type, weighted by an appropriate transition function. The proposed formulation makes clear in a simple way the characteristics of the continuous-spectrum field excited by practical sources. Numerical results which show the accuracy of this approach are provided for different configurations and frequency ranges.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
