Wave transmission lines and networks – Long lines – Strip type
Reexamination Certificate
1999-06-29
2001-03-13
Bettendorf, Justin P. (Department: 2817)
Wave transmission lines and networks
Long lines
Strip type
C333S246000, C257S664000
Reexamination Certificate
active
06201459
ABSTRACT:
This invention relates to electronic engineering and microelectronics, namely, to transmission lines. The invention can find application in constructing transmission lines with controlled characteristic impedance and length, and also as a switching device.
TECHNICAL FIELD
A transmission line is usually considered to mean a device enabling directionally transporting electric power or transmitting signals from one object to another. As a rule, a transmission line used in electrical and radio engineering appears as a system of wires or cables. Microwave-frequency microelectronics make use most frequently of a microstrip transmission line which is in fact a twin line, comprising two conductor strips between which an insulator or semi-insulator layer is placed (cf., e.g., “Electronics”. An Encylcopaedic Dictionary, Moscow, Sovetskaya Entsiklopedia Publishers, 1991, pp. 253, 254, 491; Modern Gallium-Arsenide Based Devices by M. Shur, Moscow Mir Publishers, 1991, p. 405 (in Russian). A disadvantage inherent in all transmission lines resides in that such line parameters as characteristic impedance and length cannot be controlled by an external voltage source, which impedes microminiaturization, adjustment, frequency retuning, and matching of numerous microwave-frequency microelectronic devices.
DISCLOSURE OF THE INVENTION
The present invention has for its primary and essential object to provide a unique and unprecedented transmission line featuring its characteristic impedance and length controlled by an externally applied voltage, as well as to provide such a line voltage that enables one to control, with the aid of an externally applied voltage, the number of loads connected to the transmission line and to connect thereto, using an externally applied voltage, a required load, as well as to modulate, using a control voltage, the value of a load connected to the transmission line.
The foregoing object is accomplished due to the fact that a transmission line, comprising a number of twin lines having one common conductor and other conductors, including areas
1
that establish, together with an electronic- or hole-type semiconductor layer, an ohmic contact, or are in a spaced relation to the conductor areas
1
formed either at the beginning or end of the transmission line, or both at the beginning and end of the transmission line, on the surface of an electronic- or hole-type semiconductor layer with a formed nonrectifying contact, a semiconductor and/or metallic region is established, having another nonrectifying contact and establishing, together with the aforementioned semiconductor layer, a p-n junction and/or a Schottky barrier featuring a doping profile nonuniform along the directon intersecting the conductor areas
1
; when the conductors are in a spaced relation to the conductor areas
1
, another electronic- or hole-type semiconductor layer having is provided above the clearance between said conductors and the conductor areas
1
, said semiconductor layer having a formed nonrectifying contact and carrying a p-n junction and/or a Schottky barrier formed on its surface, said junction of barrier featuring a doping profile nonuniform along the direction intersecting the conductor areas
1
with an another nonrectifying contact, while selecting the characteristic impedance and the length of the transmission line is determined by the voltage values effective across the p-n junctions and/or Schottky barriers.
In addition, the proposed transmission line may be characterized in that an insulator layer is provided above the conductor areas and contacts with semiconductor regions, or such insulator layer is provided between the contacts with the semiconductor regions.
Thus, the essence of the invention resides in utilizing a possibility of changing, with the aid of an externally applied bias, the number of twin lines constituting a transmission line.
REFERENCES:
patent: 3445793 (1969-05-01), Biard
patent: 4229717 (1980-10-01), Krone et al.
patent: 4348651 (1982-09-01), Reid
patent: 0383193 A2 (1990-08-01), None
patent: 902122 (1982-02-01), None
patent: WO 95/31010 (1995-11-01), None
Computer-Aided Design of Microwave Circuits (K. C. Gupta; Ramesh Garg; and Rakesh Chadha), pp. 41 -43, 1987 (and English translation).
GaAs Devices and Circuits (Michael Shur) p. 405, 1987 (and English translation).
Electronics, An Encyclopedic Dictionary—pp. 253, 254 and 491, 1991 (and English translation).
Ioffe Valery Moiseevich
Maksutov Askhat Ibragimovich
Bettendorf Justin P.
Hardaway/Mann IP Group
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