FREQUENCY DISCRIMINATOR

PROBLEM TO BE SOLVED: To detect a frequency with higher accuracy without making a device large nor complicated by using the hybrid of a highly accurate split (synthetic) ratio. SOLUTION: This discriminator is provided with a 1st 0 deg. hybrid C4 which distributes an input signal, a delay line Ld which delays a signal, a 1st 90 deg. hybrid C1 which distributes the signal delayed by the line Ld, a 2nd 0 deg. hybrid C5 which distributes the signal (a), a 2nd 90 deg. hybrid C2 which synthesizes the signal and a 3rd 90 deg. hybrid C3. In such a case, the 2nd 90 deg. hybrid C2 and the 3rd 90 deg. hybrid C3 are 90 deg. hybrids which distribute the signal into two signals having an equal level and are more accurate than the 1st 90 deg. hybrid C1. That is, hybrids whose split ratio (a:a) is more accurate than that of the 90 deg. hybrid C3 are used as the 90 deg. hybrids C1 and C2.