Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
194 words
A characteristic compensating apparatus for a phased array antenna comprising a power divider for dividing transmitting power into a plurality of outputs, a plurality of phase shifters each receiving respective one of said plurality of outputs of said power divider, and a plurality of radiating elements arranged in an array each for receiving an output of respective one of said plurality of phase shifters, said phased array antenna performing predetermined control over amounts of phase shift of said plurality of phase shifters for scanning a beam, said characteristic compensating apparatus comprising: monitoring means for receiving and combining outputs radiated from said plurality of radiating elements and, when said phased array antenna has a predetermined scanning angle, outputting a combined output as a monitor output; phase error calculating means for calculating, when said phased array antenna radiates a scanning beam having said predetermined scanning angle, phase errors of the outputs radiated from said plurality of radiating elements on the basis of said monitor output of said monitoring means; and phase shift correcting means for correcting, in response to outputs of said phase error calculating means, amounts of phase shift of said plurality of phase shifters.
Claim 2
Dependent Claim
194 words
A characteristic compensating apparatus for a phased array antenna comprising a power divider for dividing transmitting power into a plurality of outputs, a plurality of phase shifters each receiving respective one of said plurality of outputs of said power divider, and a plurality of radiating elements arranged in an array each for receiving an output of respective one of said plurality of phase shifters, said phased array antenna performing predetermined control over amounts of phase shift of said plurality of phase shifters for scanning a beam, said characteristic compensating apparatus comprising: monitoring means for receiving and combining outputs radiated from said plurality of radiating elements and, when said phased array antenna has a predetermined scanning angle, outputting a combined output as a monitor output; phase error calculating means for calculating, when said phased array antenna radiates a scanning beam having said predetermined scanning angle, phase errors of the outputs radiated from said plurality of radiating elements on the basis of said monitor output of said monitoring means; and phase shift correcting means for correcting, in response to outputs of said phase error calculating means, amounts of phase shift of said plurality of phase shifters.
Claim 3
Dependent Claim
40 words
An apparatus as claimed in claim 1, wherein said apparatus is applied to a microwave landing system, said calculating means and said phase shift correcting means performing operations thereof during periods in which beam scanning for microwave landing is suspended.
Claim 4
Dependent Claim
66 words
An apparatus as claimed in claim 2, wherein said phase shift correcting means comprises a plurality of latches each being associated with respective one of said plurality of phase shifters and each storing correcting data associated with said associated phase shifter, whereby amounts of phase shift of said phase shifters are controlled with said correcting data stored in said latches during beam scanning for microwave landing.
Claim 5
Dependent Claim
96 words
A compensation apparatus for a phase array antenna having a plurality of radiating elements and a plurality of phase shifters each associated with each radiating element, comprising: phase measuring means for measuring, during a period in which said antenna is not scanning, phases of high frequency signals radiated from individual radiating elements; computing means for computing amounts of phase to be corrected on the basis of said phases measured by said phase measuring means; and feedback means for feeding back said amounts of phase computed by said computing means to phase control over said phase shifters.
Claim 6
Dependent Claim
96 words
A compensation apparatus for a phase array antenna having a plurality of radiating elements and a plurality of phase shifters each associated with each radiating element, comprising: phase measuring means for measuring, during a period in which said antenna is not scanning, phases of high frequency signals radiated from individual radiating elements; computing means for computing amounts of phase to be corrected on the basis of said phases measured by said phase measuring means; and feedback means for feeding back said amounts of phase computed by said computing means to phase control over said phase shifters.