Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Patent
1998-11-18
2000-07-25
Bettendorf, Justin P.
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
333172, 333185, 336212, H03H 706
Patent
active
060941103
ABSTRACT:
This invention relates to a radio frequency ("RF) choke having improved insertion loss and reduced hum modulation. The RF choke includes three conductors wound in series around an elongated core. The first conductor forms a first group of windings where each turn abuts the next turn. The second conductor forms a second group windings where each turn is spaced from the next. The third conductor forms a third group of windings where each turn abuts the next turn. The second and third groups of windings are wound in an opposite direction around the core than the first group of windings. The elongated core can include two separate diameters. A plurality of resistors are electrically connected to said conductors to provide an impedence that effectively blocks an RF signal at between 5 MHz and 1000 MHz. This type of choke can be employed in numerous circuits, including line splitters and couplers, trunk amplifiers, bridge amplifiers and line extender amplifiers.
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Bettendorf Justin P.
National Electronic Devices, Inc.
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