| 摘要 |
PROBLEM TO BE SOLVED: To provide a helical antenna with a required pitch with few errors. SOLUTION: An almost rectangular element film on which a helical element pattern at a required inclination is formed beforehand by etching or the like is adhered to a dielectric pipe by matching the pipe edge part with the film edge part. Then, one end of the conductor pattern of the helical element pattern is overlapped on the other end of the other conductor pattern byλ/4, so as to be connected with respect to high frequencies. Thus, a helical antenna can be constituted.
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