US 12,287,415 B1
Zero-balance phase measurement circuit
Walter J. Kaminski, Long Valley, NJ (US)
Filed by Walter J. Kaminski, Long Valley, NJ (US)
Filed on Oct. 9, 2024, as Appl. No. 18/910,497.
Int. Cl. G01S 3/48 (2006.01); G01S 3/04 (2006.01)
CPC G01S 3/48 (2013.01) [G01S 3/043 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A zero-balance phase measurement apparatus, comprising:
a first hybrid coupler comprising a first input port configured to receive a first radio frequency (RF) signal from a first receiving element, and first and second output ports, the second output port generating a 90-degree phase shift relative to the first output port; and
a second hybrid coupler comprising a second input port configured to receive an RF signal from a second receiving element, and third and fourth output ports, the fourth output port generating a 90-degree phase shift relative to the third output port,
wherein the first output port is coupled to a first input of a first phase detector, the second output port is coupled to a second input of a second phase detector, the third output port is coupled to a first input of the second phase detector, and the fourth output port is coupled to a second input of the first phase detector, and
wherein the zero-balance phase measurement apparatus is configured to generate a zero-balance phase output signal as a function of first and second phase difference signals generated by the first and second phase detectors, respectively, the first phase difference signal being indicative of a phase difference between respective signals at the first and second inputs of the first phase detector, and the second phase difference signal being indicative of a phase difference between respective signals at the first and second inputs of the second phase detector.