| 摘要 |
PROBLEM TO BE SOLVED: To provide an excellent transmission/reception control circuit which does not generate strains when transmitting signals are transmitted. SOLUTION: This transmission/reception control circuit introduces the transmitting signals of a transmitting circuit to an antenna terminal ANT. At the same time, the circuit supplies received signals received through the antenna terminal ANT to a receiving circuit through a reception switching circuit section which divides the received signals into two kinds of signals in different receive frequency bands. The reception switching circuit section is provided with a capacitor Cz3 for restricting control voltage, a strip line SLz which restricts the first received signals and works as a short stub or transmission line with respect to the first received signals, and a first switching diode Dz2 which is positioned between the receiving circuit side of the strip line SLz and a ground potential and turned on when the first receives signals are received. The circuit section is also provided with a second switching diode Dz1 which is branched from a point between the capacitor Cz3 and strip line SLz, and is turned off when the second received signals are received.
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