Patent ID: 7091921

Claim:
A traveling-wave combining array antenna apparatus comprising: a first traveling-wave array antenna having a plurality of first antenna elements provided at predetermined intervals along a first feeder line, said first traveling-wave array antenna having a predetermined radiating directivity characteristic; a second traveling-wave array antenna having a plurality of second antenna elements provided at predetermined intervals along a second feeder line, said second traveling-wave array antenna having a main beam of a predetermined half-value width and a radiating directivity characteristic of a side lobe level lower than the predetermined radiating directivity characteristic of said first traveling-wave array antenna; and splitting means for splitting an inputted transmitting signal into first and second split transmitting signals, feeding the first split transmitting signal to said first traveling-wave array antenna, and feeding the second split transmitting signal to said second traveling-wave array antenna, wherein said first traveling-wave array antenna and said second traveling-wave array antenna are provided in such a manner that a crossing angle between a traveling direction of an electromagnetic wave of the first split transmitting signal traveling along said first feeder line and a traveling direction of an electromagnetic wave of the second split transmitting signal traveling along said second feeder line is larger than 90 degrees and smaller than 270 degrees, so that a variation of a main-beam radiating angle of the electromagnetic wave of the first transmitting signal radiated from said first traveling-wave array antenna corresponding to a predetermined frequency change, and a variation of a main-beam radiating angle of the electromagnetic wave of the second transmitting signal radiated from said second traveling-wave array antenna corresponding to the frequency change, are substantially canceled by each other.