ABSTRACT

The universal property of reciprocity is without a shadow of a doubt among the most intriguing concepts in ElectroMagnetic (EM) theory. Indeed, the reciprocity theorem furnishes a solid foundation for the general uniqueness theorem, encompasses the 'weak formulations' of both direct and inverse scattering/source problems with applications in computational electromagnetics. The general antenna-system description in Time-Domain (TD) can be found in and a small-antenna UWB radio link and its optimization is investigated in, for instance. This chapter purposes to construct a purely TD self-reciprocity relation that makes it possible to find the pulsed EM radiation characteristics of a planar circuit through its reaction on the incident plane wave in the receiving situation. Apart from its application in constructing the pulsed EM radiation characteristics, it is introduced self-reciprocity relation is useful for consistency benchmarks of purely numerical EM-field solvers. The chapter provides a reciprocity relation between transmitting and receiving properties of a one-port planar circuit.