1
Glenn F Engen: Six-port measuring circuit. The United States of America represented by the Secretary of Commerce, Eugene J Pawlikowski, Alvin J Englert, August 1, 1978: US04104583 (14 worldwide citation)

A six-port measuring circuit includes only four hybrids coupling two input orts to four power measuring ports. A first hybrid is connected to one input port and to second and third hybrids; a second input port is connected to the second hybrid; the second and third hybrids are connected to a fourth ...


2
Cletus A Hoer, Glenn F Engen: Vector voltmeter. The United States of America represented by the Secretary of the Air Force, Joseph E Rusz, Julian L Siegel, January 4, 1977: US04001681 (5 worldwide citation)

A vector voltmeter for measuring the amplitude and phase difference between two signals. A first signal is fed to a power divider in which one of its outputs is measured with a power detector and the other output is fed to a second divider, each output thereof being fed one each to a third and fourt ...


3