| 摘要 |
Transmission lines have variable characteristic impedance and length which may also be integrated with modulators and switches. The external electrical voltage controls the number of loads connected to the transmission line as well as connecting required loads to the transmission line and to modulate the value of a load connected to the transmission line. The transmission line includes several twin-conductor transmission lines where one conductor (2) is a main conductor. The other conductors (11), including those with different lengths, are either connected to conductive parts (1) or spaced by a gap from the conductive parts (1). The transmission lines form an ohmic contact with a semiconductor layer (4) having an electronic or hole-type conductivity with a pre-formed non-rectifying contact. The conductive parts (1) may be formed at the beginning or at the end of the transmission line or, alternatively, at the beginning and at the end of the transmission line. A semiconductor layer and/or metallic layer is formed with another non-rectifying contact at the surface of the layer (4), wherein this new layer forms, together with the layer 4, a p-n junction and/or a Schottky barrier having a non-homogenous doping profile in a direction transverse to the parts (1).
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