A Directional Coupler with a Readily Calculable Coupling Ratio

Authors :: W.E. Little
M.B. Hall
Source :: IEEE Transactions on Microwave Theory and Techniques. 15:598-603
Publication Year :: 1967
Publisher :: Institute of Electrical and Electronics Engineers (IEEE), 1967.
Abstract: A microwave (X-band) directional coupler consisting of two adjacent lengths of parallel waveguide with a common tantalum wall about for skin depths in thickness has been fabricated and studied. Coupling between the guides is effected through energy transfer via the electromagnetic fields penetrating the thin tantalum foil separating the guides. The coupling ratio of the device can be calculated by a straight-forward procedure to within experimental error (currently a few tenths of a decibel in over 70 decibels).