MUTUAL IMPEDANCE OF 2 PROBES LOCATED IN 2 DIFFERENT WAVE-GUIDE REGIONS SEPARATED BY A HOMOGENEOUS DIELECTRIC SLAB - FULLWAVE ANALYSIS

The paper presents a fullwave analysis of the mutual impedance of two probes located in the different regions I and III of an infinite recta ngular waveguide that are separated by a homogeneous dielectric medium . Basic formulations of electromagnetic fields in such a waveguide and the mutual impedance of two probes are first given in terms of dyadic Green's functions. Secondly, dyadic Green's functions for different r egions of the waveguide due to a source located in the region I are co nstructed and their coefficients are obtained by making use of the bou ndary conditions. Thirdly, the fields in the region III due to a dipol e located in the region I of the waveguide are also derived. To evalua te the probe mutual impedance, the (x) over cap (x) over cap-component of dyadic Green's function for the region III due to a source in the region I is furthermore obtained. The mutual probe impedance is then i ntegrated analytically to derive the mutual resistance and reactance o f the probes. Numerical computations are made finally to show the effe cts of the filled medium on the mutual resistance and reactance. The r esults given here can be applied to the analysis of the antenna coupli ng in the waveguides as well as in the tunnel communications.