A microwave phase bridge technique for measuring the mutual coupling of identical coupled antennas (Correspondence)

A waveguide phase bridge technique is developed for measuring the phase of the coupled signal between two loosely coupled antennas. This measurement is basically more involved than any of the available techniques for mutual coupling measurement, but it is also the only method whose accuracy is, in principle, independent of the amplitude of the coupling, For this reason, it appears to be the most simply implemented and most accurate technique for measuring the mutual coupling between very loosely coupled antennas.