SIGNAL TRANSMISSION BOARD AND SIGNAL TRANSMITTER

摘要

PROBLEM TO BE SOLVED: To provide a signal transmitter to be used in a wide frequency band and a relaxed directivity even in the case of employing a signal transmission board that is generally called as microstrip antenna. SOLUTION: Signal transmission boards 13, 14 are formed by providing a signal transmission pattern 61 and a ground pattern 62 that are double-ring- shaped onto a ring form printed circuit board 60, and a feeding point 63 is provided at a plurality of positions of the signal transmission pattern 61 and the ground pattern 62. Then feeders 65 of a coaxial cable 64 are connected to the feeding points 63. Units above are opposed to each other so that the signal transmission boards 13, 14 have a prescribed interval.