公开(公告)号：CA2896258A1

公开(公告)日：2014-10-02

申请号：CA2896258

申请日：2014-03-13

Applicant: HARRIS CORP

Inventor： AYERS SCHUYLER R ,  DITTMER TIMOTHY W ,  HANN MURRAY ,  HIBNER VERLIN A ,  WRIGHT BRIAN

IPC: E21B43/24 ,  H01Q1/04 ,  H01Q9/16 ,  H01Q9/22

Abstract: An RF antenna assembly may be positioned within a wellbore in a subterranean formation for hydrocarbon resource recovery. The RF antenna assembly includes first and second tubular conductors and a feed structure therebetween defining a dipole antenna to be positioned within the wellbore, and an RF transmission line extending within one of the tubular conductors. The feed structure includes a dielectric tube, a first connector coupling the RF transmission line to the first tubular conductor, and a second connector coupling the RF transmission line to the second tubular conductor.

公开(公告)号：ITMI930011A1

公开(公告)日：1994-07-08

申请号：ITMI930011

申请日：1993-01-08

Applicant: HARRIS CORP

Inventor： DITTMER TIMOTHY W

IPC: H03F20060101 ,  H03F1/52 ,  H03F3/60

公开(公告)号：FR2687866A1

公开(公告)日：1993-08-27

申请号：FR9300027

申请日：1993-01-05

Applicant: HARRIS CORP

Inventor： DITTMER TIMOTHY W

IPC: H03F1/52 ,  H03F3/60

Abstract: An AC power amplifier is disclosed for amplifying an AC input signal while limiting the current drawn by the amplifier. The amplifier includes at least one transistor having an input circuit for receiving an AC input signal as well as a DC bias voltage and an output circuit connected to the DC voltage source for drawing current therefrom during conductive periods of the transistor. The transistor exhibits the characteristic of being nonconductive when the AC input signal together with the DC bias voltage are less positive than a DC threshold voltage level and is conductive when the AC input signal and the DC bias voltage are together more positive than the DC threshold voltage level whereupon DC current is drawn by the output circuit from the DC voltage source. The DC current is sensed and a sense signal is provided having a magnitude in accordance therewith. The sense signal is compared with a reference current level and a control signal is provided having a value which varies as a function of the comparison. The control signal is decreased in magnitude when the sense current exceeds the reference current level. The DC bias voltage is then decreased to thereby decrease the conductivity of the transistor and thereby limit the magnitude of the DC current to that of the reference current level.

公开(公告)号：AU2014244124A1

公开(公告)日：2015-07-16

申请号：AU2014244124

申请日：2014-03-13

Applicant: HARRIS CORP

Inventor： AYERS SCHUYLER R ,  DITTMER TIMOTHY W ,  HANN MURRAY ,  HIBNER VERLIN A ,  WRIGHT BRIAN

IPC: E21B43/24 ,  H01Q1/04 ,  H01Q9/16 ,  H01Q9/22

Abstract: An RF antenna assembly may be positioned within a wellbore in a subterranean formation for hydrocarbon resource recovery. The RF antenna assembly includes first and second tubular conductors and a feed structure therebetween defining a dipole antenna to be positioned within the wellbore, and an RF transmission line extending within one of the tubular conductors. The feed structure includes a dielectric tube, a first connector coupling the RF transmission line to the first tubular conductor, and a second connector coupling the RF transmission line to the second tubular conductor.

公开(公告)号：DE69715715D1

公开(公告)日：2002-10-31

申请号：DE69715715

申请日：1997-03-12

Applicant: HARRIS CORP

Inventor： DITTMER TIMOTHY W ,  CABRERA GEORGE ,  DOYLE DALE J

IPC: H01P3/08 ,  H01P9/00 ,  H05K1/02

公开(公告)号：IT1271910B

公开(公告)日：1997-06-10

申请号：ITMI930011

申请日：1993-01-08

Applicant: HARRIS CORP

Inventor： DITTMER TIMOTHY W

IPC: H03F1/52 ,  H03F3/60 ,  H03F

Abstract: An AC power amplifier is disclosed for amplifying an AC input signal while limiting the current drawn by the amplifier. The amplifier includes at least one transistor having an input circuit for receiving an AC input signal as well as a DC bias voltage and an output circuit connected to the DC voltage source for drawing current therefrom during conductive periods of the transistor. The transistor exhibits the characteristic of being nonconductive when the AC input signal together with the DC bias voltage are less positive than a DC threshold voltage level and is conductive when the AC input signal and the DC bias voltage are together more positive than the DC threshold voltage level whereupon DC current is drawn by the output circuit from the DC voltage source. The DC current is sensed and a sense signal is provided having a magnitude in accordance therewith. The sense signal is compared with a reference current level and a control signal is provided having a value which varies as a function of the comparison. The control signal is decreased in magnitude when the sense current exceeds the reference current level. The DC bias voltage is then decreased to thereby decrease the conductivity of the transistor and thereby limit the magnitude of the DC current to that of the reference current level.

公开(公告)号：FR2687866B1

公开(公告)日：1996-02-16

申请号：FR9300027

申请日：1993-01-05

Applicant: HARRIS CORP

Inventor： DITTMER TIMOTHY W

IPC: H03F1/52 ,  H03F3/60 ,  H03F3/21

Abstract: An AC power amplifier is disclosed for amplifying an AC input signal while limiting the current drawn by the amplifier. The amplifier includes at least one transistor having an input circuit for receiving an AC input signal as well as a DC bias voltage and an output circuit connected to the DC voltage source for drawing current therefrom during conductive periods of the transistor. The transistor exhibits the characteristic of being nonconductive when the AC input signal together with the DC bias voltage are less positive than a DC threshold voltage level and is conductive when the AC input signal and the DC bias voltage are together more positive than the DC threshold voltage level whereupon DC current is drawn by the output circuit from the DC voltage source. The DC current is sensed and a sense signal is provided having a magnitude in accordance therewith. The sense signal is compared with a reference current level and a control signal is provided having a value which varies as a function of the comparison. The control signal is decreased in magnitude when the sense current exceeds the reference current level. The DC bias voltage is then decreased to thereby decrease the conductivity of the transistor and thereby limit the magnitude of the DC current to that of the reference current level.

公开(公告)号：CA2065199A1

公开(公告)日：1992-10-12

申请号：CA2065199

申请日：1992-04-06

Applicant: HARRIS CORP

Inventor： DITTMER TIMOTHY W ,  MORTIMORE RALPH L

IPC: H01P1/18 ,  H01P5/16 ,  H01P5/19 ,  H03F3/60 ,  H03F3/68 ,  H03H7/00

Abstract: A polyphase divider/combiner is provided and which includes a common input/output port and a plurality of N output/input ports, wherein N is an even integer greater than two. N electrical signal transmission paths are provided with each extending from the common input/output port to a respective one of the N output/input ports. The N electrical signal transmission paths are of N different electrical lengths such that the output/input ports are out of phase relative to each other by 180/N degrees.