| 摘要 |
PROBLEM TO BE SOLVED: To provide a glass antenna circuit which improves the S/N of a radio receiver connected to a glass antenna. SOLUTION: The glass antenna 10 having impedance of which real number value is <=40Ωis formed, its antenna input 20 is matched with a high-frequency amplifying circuit 24 by an impedance matching circuit 22 through a general input filter circuit 18, and the impedance of the high-frequency amplifying circuit 16 is set high toι150Ωhigher than reference impedance of 75Ω. Consequently, the S/N of the connected radio receiver is evidently improved from its conventional S/N.
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