Radar system and components therefore for transmitting an electromagnetic signal underwater
AssigneeRaytheon Company
InventorsMario D. Grossi, Mark A. Seferian, Michael G. Soyka
Life of this patent
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Abstract
An antenna for transmitting electromagnetic signals having a frequency less than 500 Hz includes a beam of dielectric material and a conductive sheet wound in a helical pattern around the beam of dielectric material. The antenna further includes a core fabricated from a silicon and iron alloy, the cote disposed between the beam of dielectric material and the conductive sheet. With such an arrangement, a magnetic dipole antenna is provided capable of providing a magnetic moment of approximately 10.sup.6 to 10.sup.7 Am.sup.2.
Claims16
A magnetic dipole antenna comprising:
- means for providing a magnetic moment for transmitting electromagnetic signals having a frequency less than 500 Hz comprising:
- (a) a beam of dielectric material;
- (b) a core having a permeability of at least 5000;
- and
- (c) a conductive sheet wound in a helical pattern around the beam of dielectric material and the core, each winding of the helical pattern disposed adjacent an adjacent winding to provide a magnetic dipole.
An electromagnetic radar system for transmitting an electromagnetic signal comprising:
- (a) transmitter means for providing a pulsed electromagnetic signal having a frequency less than 500 Hz;
- and
- (b) a magnetic dipole antenna fed by said pulsed electromagnetic signal, said magnetic dipole antenna comprising means for providing a magnetic moment comprising:
- (i) a beam of dielectric material;
- (ii) a conductive sheet wound in a helical pattern around the beam of dielectric material, each winding of the helical pattern disposed adjacent an adjacent winding to provide a magnetic dipole;
- and
- (iii) a core having a permeability of at least 5000 disposed between the beam of dielectric material and the conductive sheet.
An electromagnetic radar system for transmitting an electromagnetic signal comprising:
- (a) transmitter means for providing a pulsed electromagnetic signal having a frequency less than 500 Hz;
- and
- (b) means, fed by said pulsed electromagnetic signal, for providing a low impedance and a high magnetic moment comprising:
- (i) a beam of dielectric material;
- (ii) a conductive sheet wound in a helical pattern around the beam of dielectric material;
- and
- (iii) a core disposed between the beam of dielectric material and the conductive sheet;
- (c) a switch means, connected between said transmitter means and said providing a low impedance and a high magnetic moment means and responsive to a switch control signal, for selectively connecting and disconnecting said transmitter means to said providing a low impedance and a high magnetic moment means;
- and
- (d) controller means for providing the switch control signal to the switch means for disconnecting said transmitter means from said providing a low impedance and a high magnetic moment means at a moment when the current of the pulsed electromagnetic signal is at a zero level.
Dependencies are inferred from the claim text.