Reciprocity relations in waveguide junctions

The Lorentz reciprocity condition is applied to junctions composed or reciprocal media which connect uniform but otherwise arbitrary waveguides. An expression relating for forward and reverse transmission coefficients is derived and factored into two terms, the first involving the phase of the reference impedance in the guide and the second a new reciprocity factor. The usual condition equation the forward and reverse transmission coefficients is shown not to hold in the general case. Experimental evidence supporting the theoretical results is presented