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4502009 |
Apparatus adapted for single pulse electromagnetic measurements of soil conductivity and dielectric constant
A method and installation for ground illumination by means of electromagnetic radiation generated by an aerial simulator coupled to the ground and for calculation of the dielectric constant and...
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4463358 |
Convertible termination tip for submarine buoyant cable antenna system
A termination tip for submarine buoyant cable antenna systems can quickly converted from grounding to insulating and vice versa any number of times. The nosepiece assembly fits over a pin contact...
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4458248 |
Parametric antenna
A communication system suitable for use at a broad range of radio frequencies utilizes a parametric magnetic dipole antenna. This antenna incudes an elongated core, favorably formed of a hexagonal...
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4445123 |
Method for establishing a vertical E-field antenna installation
A method of establishing an ELF/VLF, vertical E-field transmitter loop antenna installation. The method comprises the steps of ascertaining a land region having contiguous areas of widely differing...
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4346953 |
Antenna coupling assembly
A flexible coupling assembly for a radio antenna of a submarine buoyant ce antenna system is connected in a cable line that retains the characteristics of the cable as regards the outside diameter,...
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4334227 |
Electronic marker device and method of making same
Passive type electronic marker device is hoop shaped, with the hoop thickness in the radial direction being substantially less than the hoop width in the axial direction and with a tuned circuit...
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4312003 |
Ferrite antenna
A ferrite antenna assembly comprising a ferrite rod surrounded by a first coil and positioned within a surrounding ferrite or the like cylinder provided with a second coil. A signal which is 180°...
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4274097 |
Embedded dielectric rod antenna
A compact, directional antenna element for achieving narrow beamwidths and ide bandwidths. The element is formed from a polyrod having a high dielectric constant embedded in a wave guide made of a...
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4217468 |
Spiral line oscillator
A compact lightweight high power RF generator for use in military systems combines the principles of vector inversion transform systems with a RF tank circuit. The capacitively stored energy in the...
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4167736 |
Fluid flow measurement
A dielectric aerial is disposed in contact with a dielectric liquid, and projects microwave radiation thereinto. The reflected radiation is received by the aerial, and the flow rate of the liquid...
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4163977 |
Double loop receiver-transmitter combination
A double loop receiver used in conjunction with a transmitter broadcasting at low frequencies as a vertical magnetic dipole. The two loops are connected with their planes parallel in a resonant...
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4104641 |
Nonuniformly optimally spaced array with specified sidelobe positions in the radiation pattern
The object of this invention is to provide a method for a new nonuniformly spaced array with nonuniform amplitudes for sonar, seismic, and electromagnetic applications, where the optimum positions...
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4088998 |
System for detecting nuclear explosions
1. Apparatus for detecting underground nuclear explosions comprising antenna means located in the dielectric substance of a deep waveguide in the earth and adapted to detect low frequency...
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4075635 |
Nonuniformly optimally spaced array with specified zeros in the radiation pattern
The object of this invention is to provide a method for a new nonuniformly spaced array with nonuniform amplitudes for sonar, seismic and electromagnetic applications, where the optimum positions...
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4066993 |
Limited-range seismic control system
A seismic exploration system includes a recording vehicle having a seismic cable connected thereto and one or more vibrator units. The seismic sensor cable includes at least one unterminated...
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4062010 |
Underground pipe detector
An apparatus and method wherein an electrical impulse source transmits a radar-type signal through an antenna into the ground and is reflected by a target. The reflected signal or echo is detected...
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4030032 |
Radio transmission system
1. A method of radio transmission comprising radiating electromagnetic waves in the earth's crust through a "deep wave guide" formed of basement rock bounded on its upper side by a surface layer of...
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4028707 |
Antenna for underground pipe detector
An apparatus and method wherein an electrial impulse source transmits a radar-type signal through an antenna into the ground and is reflected by a target. The reflected signal or echo is detected...
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4017863 |
Hardened electromagnetic wave energy sensor
Hardening of an electromagnetic wave sensor is accomplished by housing it low ground in a protective reinforced concrete structure that supports a cage of insulated conductors that has an interior...
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3972047 |
Floating cable antenna system
A buoy is towed by a submerged submarine through means of an electro-mechanical cable. A cable reel is disposed in the buoy to store an inflatable buoyant cable having a pressure accumulator...
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3965474 |
Antenna for receiving VLF/LF transmission in seawater
An improved device and technique for improving the reception of very low quency and low frequency transmissions in seawater. A loop antenna, wound on a ferrite core, is encapsulated in a water...
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3964051 |
Electrostatic communication system
A pair of concentric conducting spheres separated by a dielectric layer form a monopole radiator which serves as an antenna for electrostatic waves. Corresponding signal voltages of opposite...
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3906492 |
System for the surveillance of objects moving along a route
A system for the surveillance of a route along which vehicles are moving, and which operates in real time, comprises radar equipment whose transmitter and receiver are each connected to a leak line...
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3877033 |
NONUNIFORMLY OPTIMALLY SPACED ARRAY WITH UNIFORM AMPLITUDES
The object of this invention is to provide a method for a new nonuniformly spaced array with uniform amplitudes for sonar, seismic and electromagnetic applications, where the optimum positions of...
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3867710 |
COMMUNICATION SYSTEM
7. A system for communicating electromagnetic signals through the atmosphere between at least two underwater objects capable of transmitting and receiving electromagnetic signals comprising a...
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3829767 |
RADIO COMMUNICATION SYSTEM FOR USE IN CONFINED SPACES AND THE LIKE
A radio communication for use within confined spaces including at least one coaxial-type cable in which electric signals are propagated at a reduced attenuation, such signals being screened by the...
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3823402 |
ANTENNA DEPLOYED FROM AIRCRAFT TO CONTACT A BODY OF WATER FOR LENGTH REDUCTION
The method and apparatus is disclosed for radiating low-frequency radio waves. In particular, an extended length of a vertical radiator or antenna is suspended from a suitable aircraft, such as a...
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3803616 |
SUB-SURFACE RADIO SURFACE WAVE LAUNCHER
A large increase in the signal strength of the surface wave transmitted from a buried or sub-surface antenna is achieved by shaping the interface region, at which the sub-surface wave is directed,...
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3790949 |
SURVIVABLE GROUND ANTENNA SYSTEM
A survivable ground antenna system which relies upon its location within the earth for protection from natural or man-made forces. The antenna system utilizes a "point source" feed located within a...
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3788255 |
EXPENDABLE SUBMARINE RECEIVING ANTENNA
An expendable radio communication antenna for use by a submarine submerged t a depth at which its permanent antenna installation is ineffective, comprising a buoyant capsule, having an opening...
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3780372 |
NONUNIFORMLY OPTIMALLY SPACED ANTENNA ARRAY
The object of this invention is to provide a new nonuniformly spaced antenna array, where the most optimum positions of the array elements, and their corresponding amplitudes, are systematically...
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3775772 |
ULTRA HARD COMMUNICATIONS ANTENNA
A ground-to-air antenna capable of withstanding all overpressures outside the crater of a nuclear explosion including a massive reinforced concrete block having one exposed surface flush with the...
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3742509 |
SUBSURFACE TRAVELING WAVE ANTENNA
A subsurface traveling wave antenna for generating and receiving primarily surface waves in either the vertical or horizontal position below the surface. The antenna comprises an insulated linear...
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3705407 |
RADIO SURFACE WAVE ANTENNA
An antenna for radio surface waves may be constructed from a conductor such as a tube or a flat plate which is an even multiple of wavelengths long. There is a discontinuity or gap in the conductor...
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3704466 |
SURVIVABLE TELESCOPING ANTENNA
A survivable telescoping antenna having an outer housing and a plurality of elements nested therein. A radiator is mounted on the innermost element. When the elements are in a retracted position...
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3680133 |
SUBSURFACE TRAVELING WAVE ANTENNA
A subsurface traveling wave antenna in which a first and a second insulated matched load terminated linear radiating element is positioned in a plane normal to and under the surface. Each of the...
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3673334 |
ANTENNA FOR USE WITH AN AUDIO INDUCTION COMMUNICATION SYSTEM
An antenna for use with an audio induction communication system provides a communication field of substantially uniform strength at all points within a given pick-up zone along which...
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3670247 |
METHOD AND DEVICE FOR RADIATING MEGAMETRIC RADIO WAVES
1. A process for radiating megametric radio waves which consists in generating an alternating voltage at extremely low frequency ranging from 1 cycle to 100 cycles per second, applying said voltage...
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3660760 |
INDUCTIVE COMMUNICATION SYSTEM
There is disclosed a communication system in which a pair of spaced conductor rods or elements, embedded or placed in the earth, and energized by a signal voltage to induce a dynamic magnetic...
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3629937 |
METHOD OF FORMING A HELICAL ANTENNA
The method of making an antenna wherein pairs of conducting elements are helically disposed and supported around a central conducting element and longitudinally coupled with other conductive...
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3609247 |
INDUCTIVE CARRIER COMMUNICATION SYSTEMS
An integrated multiple-function communication system for highways, railroads and other applications, the system comprising a wideband coaxial trunk cable with associated amplifier/repeaters for...
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3594798 |
UNDERGROUND ANTENNA
The present invention relates in general to a hardened antenna, and in particular to a broadside array antenna which is placed at or below the surface of the ground, which is capable of...
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3495209 |
UNDERWATER COMMUNICATIONS SYSTEM
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3482370 |
METHOD OF INSTALLING SUBTERRANEAN ANTENNA
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3470474 |
UNDERGROUND RADIO COMMUNICATION SYSTEM FOR HIGHWAYS
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3435457 |
UNDERGROUND ANTENNA
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3419873 |
Monopole antenna
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3347003 |
Protective mounting structure for retractable antenna
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3346864 |
Underground antenna
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3334347 |
Shock resistant horn antenna
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