| 摘要 |
PROBLEM TO BE SOLVED: To provide a connection structure that a eliminates impedance mismatchings caused at a connection part between a coaxial line and a strip line. SOLUTION: An in-case coaxial line 2-1 has a coaxial line 2-2 with a capacitive reactance, the radius of the outer conductor of which is smaller than a coaxial line 2-4 giving the characteristic impedance and is structured, such that the coaxial line 2-2 is sandwiched in between coaxial lines 2-3, 2-4, whose impedance is equal to the characteristic impedance. A center conductor of the coaxial line 2-1, as shown in a connection part 2-1 in Figure connects the coaxial line 2-1 and a microstrip line 3. Furthermore, a common ground 3-1 of the microstrip line 3 is connected to a case 1 to form the same common ground as for the case 1.
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