Multi-phase coupler with a noise reduction circuit
OwnerJames A. Scharfe, Jr.inventor
Life of this patent
Estimating the term…
Abstract
A multi-phase coupler including a noise reduction circuit which provides two output signals which are separately shifted in phase with respect to an input radio frequency (RF) signal. The input RF signal is capacitively phase-shifted to lead the phase of an input RF signal to provide one output signal and is inductively phase-shifted to lag the phase of an input RF signal to provide a second output signal. The two phase-shifted outputs are impedance matched to the dual input ports of a balanced radiating structure that acts as a point source when the input ports are driven in phase quadrature.
Claims27
A coupler for shifting the phase of a radio frequency input signal into at least two output signals that are phase shifted with respect to one another comprising:
- a) an input circuit for receiving a radio frequency input signal;
- b) an inductive output circuit, connected to said input circuit to receive the input signal, for shifting inductively the phase of the input signal, said inductive output circuit outputting a first radio frequency output signal having a phase which lags a phase associated with the input signal, said inductive output circuit comprising a transformer having a first and a second coil, said first coil connected to said input circuit to receive the radio frequency input signal and said second coil inductively coupled to said first coil for outputting the first radio frequency output signal;
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- c) a capacitive output circuit, connected to said input circuit to the radio frequency input signal, for shifting capacitively the phase of the radio frequency input signal, said capacitive circuit outputting a second radio frequency output signal having a phase which leads the phase of the radio frequency input signal.
A coupler for shifting the phase of a radio frequency input signal into at least two transmit signals that are phase shifted with respect to one another for transmitting radio frequency energy by radio frequency radiating structures in a transmit mode and for receiving radio frequency receive signals from the structures in a receive mode comprising:
- a) an electrical connection for receiving a radio frequency transmit signal and for outputting radio frequency receive signals;
- b) an inductive circuit, connected to said electrical connection to couple a radio frequency transmit signal in a transmit mode and to couple radio frequency receive signals in a receive mode, said inductive ciruit shifting inductively the phase of the radio frequency transmit signal, said inductive circuit outputting a first output transmit signal having a phase which lags a phase associated with the radio frequency transmit signal, said inductive circuit comprising a first and a second coil, said second coil inductively coupled to said first coil for outputting the first output transmit signal, said inductive circuit operating in a receive mode reciprocally to an operation thereof in a transmit mode;
- c) a capacitive circuit, connected to said electrical connection to receive the radio frequency transmit signal in a transmit mode and to couple radio frequency receive signals in a receive mode, said capacitive circuit shifting capacitively the phase of the radio frequency transmit signal, said capacitive circuit outputting a second output transmit signal having a phase which leads the phase of the radio frequency transmit signal, said first and second output signals being shifted from the phase of the input transmit signal to be in phase quadrature with respect to each other, said capacitive circuit operating in a receive mode reciprocally to an operation thereof in a transmit mode;
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- d) said radio frequency radiating structures comprising first and second radio frequency radiating structures, which are connected to said second coil of said inductive circuit and to said capacitive circuit, respectively, to receive said first and second output signals, respectively, and to radiate radio frequency energy in the transmit mode and to receive radio frequency energy in the receive mode, the radio frequency receive signals being coupled from said structures to said second coil of said inductive circuit and to said capacitive circuit in a receive mode.
The coupler and radiating structures as claimed in claimed 21, wherein the radio frequency energy transmitted by said first and second radiating structures in the transmit mode is reflected as a near vertical incidence skywave.
A noise reduction circuit for attenuating radio frequency noise on a first RF signal, said noise reduction circuit comprising a capacitive circuit and a first inductive circuit connected in parallel, said capacitive circuit and said inductive circuit connected to a first input for receiving the first RF signal, said capacitive circuit producing a second RF signal from said first RF signal which leads the first RF signal in phase, said first inductive circuit producing a third RF signal from said first RF signal which lags the first RF signal in phase, said second and third RF signals being summed at a summing point to cancel noise of opposite polarity and phase, thereby producing an output RF signal at the summing point.
A coupler for shifting the phase of a radio frequency input signal into at least two output signals that are phase shifted with respect to one another comprising:
- a) an input circuit for receiving a radio frequency input signal;
- b) an inductive output circuit, connected to said input circuit to receive the input signal, for shifting inductively the phase of the input signal, said inductive output circuit outputting a first radio frequency output signal having a phase which lags a phase associated with the input signal, said inductive output circuit comprising a transformer having a first and a second coil, said first coil connected to said input circuit to receive the radio frequency input signal and said second coil inductively coupled to said coil for outputting the first radio frequency output signal;
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- c) a capacitive output circuit, connected to said input circuit to receive the radio frequency input signal, for shifting capacitively the phase of the radio frequency input signal, said capacitive circuit outputting a second radio frequency output signal having a phase which leads the phase of the radio frequency input signal, said capacitive output circuit being adjustable for adjusting the phase of the second radio frequency output signal to be in phase quadrature with the first output signal.
Dependencies are inferred from the claim text.