| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a transmission and reception circuit that can ensure broadband characteristics by designing a 1st matching circuit of a 1st antenna to match the characteristics of a transmission circuit and then providing a 2nd matching circuit to compensate the antenna characteristics for a reception purpose to a reception circuit at a position after a transmission/reception change over switch. SOLUTION: The transmission reception circuit comprises a 1st switch 105 having one common terminal and two changeover terminals, a 1st matching circuit 103 that matches impedance, a 1st antenna 102 connected to the common terminal of the 1st switch 105 via the 1st matching circuit 103, a transmission circuit 101 connected to one changeover terminal of the 1st switch 105, a 2nd matching circuit 104 that matches impedance, a 2nd switch 108 that has one common terminal and two changeover terminals one of which is connected to the other changeover terminal of the 1st switch 105 via the 2nd matching circuit 104, a 2nd antenna 107 connected to the other changeover terminal of the 2nd switch 108, and the reception circuit 106 connected to the common terminal of the 2nd switch 108.</p> |
