High-efficiency broadband antenna
First Claim
1. A method for tuning an antenna system including an E-cylinder and D-plate, wherein the E-cylinder and the D-plate are operably coupled to a tuning network including a transmitter feed tuning circuit, an E-cylinder tuning circuit, and a D-plate tuning circuit, comprising:
- estimating an impedance of the E-cylinder;
estimating an impedance of the D-plate;
determining a current ratio to provide approximately equal power to the E-cylinder and the D-plate;
providing a carrier signal to a transmitter input;
setting a reactance of the E-cylinder tuning circuit and a reactance of the D-plate tuning circuit based on the current ratio;
setting a reactance of the transmitter feed tuning circuit if the E-cylinder and the D-plate are receiving approximately equal power at approximately a 90 degree phase difference; and
modifying the reactance of the E-cylinder tuning circuit and the D-plate tuning circuit if the E-cylinder and the D-plate are not receiving approximately equal power at a 90 degree phase difference.
1 Assignment
0 Petitions
Accused Products
Abstract
Techniques for tuning a crossed-field antenna are provided. An example of an antenna system includes a D-plate with a D-plate feed conductor, such that the D-plate is a horizontal conductor raised above and insulated from a ground plane, an E-cylinder with an E-cylinder feed conductor, such that the E-cylinder is a vertical hollow conductive cylinder of smaller diameter than the D-plate, which is mounted concentrically above and insulated from the D-plate, a transmitter tuning circuit configured to receive a signal from a transmitter, an E-cylinder tuning circuit operably coupled to the transmitter tuning circuit and the E-cylinder feed conductor, and a D-plate tuning circuit operably coupled to the transmitter tuning circuit and the D-plate feed conductor.
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Citations
16 Claims
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1. A method for tuning an antenna system including an E-cylinder and D-plate, wherein the E-cylinder and the D-plate are operably coupled to a tuning network including a transmitter feed tuning circuit, an E-cylinder tuning circuit, and a D-plate tuning circuit, comprising:
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estimating an impedance of the E-cylinder; estimating an impedance of the D-plate; determining a current ratio to provide approximately equal power to the E-cylinder and the D-plate; providing a carrier signal to a transmitter input; setting a reactance of the E-cylinder tuning circuit and a reactance of the D-plate tuning circuit based on the current ratio; setting a reactance of the transmitter feed tuning circuit if the E-cylinder and the D-plate are receiving approximately equal power at approximately a 90 degree phase difference; and modifying the reactance of the E-cylinder tuning circuit and the D-plate tuning circuit if the E-cylinder and the D-plate are not receiving approximately equal power at a 90 degree phase difference. - View Dependent Claims (2, 3, 4, 5)
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6. A medium frequency transmitting antenna system, comprising:
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a D-plate including a D-plate feed conductor, wherein the D-plate is a horizontal conductor raised above and insulated from a ground plane and a diameter of the D-plate is approximately 0.02 times a wavelength of an operational frequency of the antenna system; an E-cylinder including an E-cylinder feed conductor, wherein the E-cylinder is a vertical hollow conductive cylinder of smaller diameter than the D-plate, which is mounted concentrically above and insulated from the D-plate and a height of the E-cylinder is approximately 0.035 times the wavelength of the operational frequency of the antenna system; a transmitter tuning circuit configured to receive a signal from a transmitter; an E-cylinder tuning circuit operably coupled to the transmitter tuning circuit and the E-cylinder feed conductor; and a D-plate tuning circuit operably coupled to the transmitter tuning circuit and the D-plate feed conductor; wherein an E-cylinder tuning circuit reactance and a D-plate tuning circuit reactance are set such that approximately equal power is provided to the E-cylinder and the D-plate, and a transmitter tuning circuit reactance is set based at least in part on the E-cylinder tuning circuit reactance and the D-plate tuning circuit reactance. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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14. A medium frequency transmitting antenna system, comprising:
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a D-plate including a D-plate feed conductor, the D-plate having a diameter approximately 0.02 times a wavelength of an operational frequency of the antenna system; an E-cylinder including an E-cylinder feed conductor, the E-cylinder having a height of approximately 0.035 times the wavelength of the operational frequency of the antenna system; a transmitter tuning circuit including a T-network with a first inductor, a second inductor, and a shunt leg including a variable capacitor and a parallel capacitor; an E-cylinder tuning circuit including a series inductor and a variable shunt inductor; and a D-plate tuning circuit including a series variable inductor with a shunt inductor; wherein the transmitter tuning circuit is configured to receive a signal from a transmitter, the E-cylinder tuning circuit is operably coupled to the E-cylinder feed conductor and the transmitter tuning circuit, and the D-plate tuning circuit is operably coupled to the D-plate feed conductor and the transmitter tuning circuit. - View Dependent Claims (15, 16)
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Specification