| 摘要 |
PURPOSE:To improve the electric separation between input/output lines by providing a transistor (TR) having prescribed input/output impedance between 1st and 3rd terminals and between 2nd and 3rd terminals, providing a microstrip line between the 1st and 3rd terminals and providing a coplaner line between the 2nd and 3rd terminals. CONSTITUTION:In giving a microwave signal to a coplaner line 12 comprising a center conductor 9 and ground conductors 10, 11 via a connection terminal or the like, the said microwave signal is inputted to a grounded-gate MESFET 20, where processings such as impedance conversion from the said input impedance into the said output impedance and amplification are executed and the result is outputted to a microstrip line 4. Since electric isolation action exists between a source electrode 22 and drain electrodes 23a, 23b of the MESFET 20 as well known, the input/output lines 4, 12 are isolated electrically, and even when reflection exists in a circuit connected to the microstrip line 4, its reflected wave does not appear on the coplaner line 12 without being modified. Thus, the countermeasures as above such as an isolator against the reflected wave are not required. |
