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4220955 |
RF coupling device for connecting a hand held radio to an external device without removing the antenna
An R-F coupling device of greatly improved coupling and shielding characteristics is disclosed for inductive connection to the antenna circuitry of a hand-held transceiver without necessitating the...
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4218683 |
Range focus lens
Various aspects of electro-magnetic testing are facilitated by inserting a foamed plastic dielectric lens at a particular position between a particular radiating source and the test aperture. The...
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4214210 |
Electromagnetic noise source locator
An electromagnetic noise source locator is comprised of an audio amplifier which is connected to drive a speaker and to which is connected at the input a series circuit that includes a very small...
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4207518 |
Broadband radiation detector with diode elements
A radiation detector for free space microwave radiation uses thin film resistive strips, having an equivalent surface resistivity that is large compared to the characteristic impedance of free...
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4201987 |
Method for determining antenna near-fields from measurements on a spherical surface
A method for determining antenna near-fields from measurements on a spherical surface. Phase and intensity values are measured by scanning a probe antenna over a spherical surface. The method...
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4199257 |
Projected reticle optical sighting system
An optical sighting system for aiming the main operative axis of an apparatus in the direction of a distant target wherein the sighting system includes an optical sighting device fixed to the...
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4196394 |
Antenna/like impedance matcher
A matching coupler in an antenna system to power transfer in matching characteristic impedance of an antenna and a transmission line using a ganged variable capacitance with a resonate coil and...
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4167738 |
Antenna mounted tuning indicator
A device facilitating the tuning of an antenna system comprising a body having an opening accommodating its mount to and operative connection with a whip, wire or rod type antenna, incorporating...
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4157550 |
Microwave detecting device with microstrip feed line
A microwave detector comprises a tapered ridged horn that terminates in a ridged waveguide formed with a slot extending through a broad wall of the waveguide and through the ridge that accommodates...
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4134116 |
Monitoring commutated scanning radio beams
Determination of the pointing accuracy of a commutated scanning beam aerial is effected by monitoring the phase of the signal received at a point where, at all times during its operation, a field...
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4134119 |
Antenna test shield
Apparatus for transferring electromagnetic signal energy between a signal circuit and an antenna that extends outwardly from a ground-plane surface includes a conductive shield that substantially...
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4132992 |
Radiator/circuit incorporating a cross slot waveguide antenna array which will instantaneously measure the radiation axial ratio or degree of linear polarization of any antenna
The circuit includes a receiving circularly polarized crossed slot waveguide antenna having a longitudinal axis and spaced crossed slots disposed on a selected side of said axis spaced therefrom;...
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4118668 |
R.F. Network antenna analyzer employing sampling techniques and having remotely located sampling probes
The present invention relates to the combination of two conventional vector oltmeters into a single network analyzer for an antenna. The first vector voltmeter is connected to the output of an...
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4107688 |
Monitor for localizer antenna arrays
Monitor comprises approximately matched means for sampling currents in the radiating elements. The sample currents are divided into three sets of parts. One set is used for monitoring course...
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4096441 |
Test instrument for transmitters
The herein disclosed test instrument includes an arrangement for measuring the standing wave ratio of a transmitter, antenna combination which comprises a printed circuit board having a first...
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4091327 |
Broadband isotropic antenna with fiber-optic link to a conventional receiver
A broadband active isotropic receiving antenna for use with a conventional lectromagnetic interference receiver to measure weak near-zone electric fields of unknown polarization. The antenna...
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4083006 |
Loop type standard magnetic field generator
In a loop type standard magnetic field generator comprising loop within which a transmission line having an inner conductor and an outer conductor is coaxially provided and an oscillator for...
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4070621 |
Antenna with electro-optical modulator
A wideband, passive detector of electromagnetic fields in free space is disclosed. The apparatus is especially designed to minimize amplitude perturbations of the electromagnetic field being...
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4051479 |
ELF vertical dipole antenna suspended from aircraft
A vertical dipole antenna for the ELF (extremely low frequency) range. The antenna provides a series resonant circuit consisting of an inductor and the distributed capacitance of the conductor such...
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4044303 |
Microwave radiation detector
A microwave or other r.f. radiation detector in which a tunnel diode or other negative resistance device exhibiting the proper I-V (current-voltage) characteristics is biased in the positive...
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4016569 |
Near field antenna boresight alignment apparatus
Alignment of the optical, mechanical and electrical axes of an antenna system is accomplished at short range by means of a test antenna having an aperture that is approximately 20 percent greater...
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4004227 |
Radio frequency interference (RFI) testing by the dual screen room technique
The RFI generated by a piece of electrical or electronic equipment is meaed by placing the equipment within a screened test room. A pick-up antenna within the room generates a signal which, after...
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3961260 |
Apparatus and method for testing the condition of an antenna monitoring system
A method and apparatus for testing the condition of an antenna monitoring system are provided whereby a sampling loop and coaxial cable assembly may be provided for each antenna element and wherein...
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3947770 |
Broadband omnidirectional RF field intensity indicating device
A device for indicating the intensity of the vertical component of an incnt electromagnetic field independently of the frequency or the direction of the field uses a dual-loop antenna, current...
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3931573 |
Radiation detector
A detection device for electromagnetic radiation uses strips of thin resistive films connected in electrically conductive paths with the area of spacing between adjacent ones of the strips being...
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3922679 |
Wide band radio-frequency phase sensor
A phase sensing device, indicating RF transmitter antenna resonance with a igh degree of accuracy, for use with tuneable antennae operating in a frequency range of 2 - 30 MHz. The device operates...
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3919638 |
Microwave detection instrument
An instrument for detecting microwave energy and for giving an accurate measurement of the power density thereof, which instrument needs no internal amplifier and is substantially unaffected by...
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3909830 |
Tactical high frequency antenna
An electrically short (less than λ/4) antenna for operation in the equency range from 2 to 30 megahertz (MHz). The antenna system contemplated by the subject invention comprises a short...
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3906403 |
Impedance simulator for simulating the impedance of an antenna radiating in an open space over a selected frequency band
An impedance simulator having the capability of simulating the operational mpedance characteristics of a whip antenna in open field throughout a given frequency range. The simulator includes a...
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3906411 |
Antenna tuning apparatus
This invention relates to an antenna tuning apparatus wherein the impedance of the antenna can be matched or "tuned-up" without emitting radiation at a detectable level. More particularly, the...
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3890571 |
Radio frequency polarimeter
A radio frequency polarimeter is disclosed for measuring the polarization characteristics of an RF signal existing in a round wave guide. The polarimeter includes an RF pick-up head, an RF switch,...
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3889268 |
Method of antenna tuning
A method and apparatus for adjusting the physical dimensions of an antenna radiating element to its electrically resonant length at a predetermined frequency by coupling a radiation sensitive...
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3879733 |
METHOD AND APPARATUS FOR DETERMINING NEAR-FIELD ANTENNA PATTERNS
A cost-effective and practical technique for obtaining far-field patterns complex radiating or receiving structures such as ships, aircraft, or shore site antennas. Actual phase and amplitude...
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3873981 |
MICROWAVE RADIATION MONITOR
A microwave radiation monitor comprises a microwave receiver antenna containing a microwave diode connected to a first monitor circuit for monitoring the microwave energy level within the aerial....
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3868689 |
Log periodic pole mounted marker beacon antenna
An ILS marker beacon antenna of the type wherein a pair of parallel conductors form a balanced transmission line and support a plurality of lateral radiators of graded lengths. An unbalanced RF...
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3828251 |
PORTABLE MICROWAVE RADIATION SENSING AND MEASURING DEVICE
A portable device for sensing and measuring microwave energy includes an RF diode to sense the electric field of the microwaves and to convert it into direct current which is readily measured and...
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3806943 |
ANECHOIC CHAMBER
A portable microwave anechoic chamber having uniform response characteristics for rotated linearly polarized test sources, the chamber, having a first conical section at the apex of which is...
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3798646 |
CONTINUOUS-WAVE, MULTIPLE BEAM AIRPLANE LANDING SYSTEM
A microwave landing system for airplanes is disclosed in which continuous wave energy from a common source is radiated in overlapping beams which are modulated at respectively different audio...
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3794914 |
RADIATION DETECTOR EMPLOYING RESISTIVE CONNECTED THERMOCOUPLE ELEMENTS
A Radiation Detector having thin film thermo-couples disposed within a plane and supported by a non-perturbing probe which permits accurate measurement of an electric field in the near-field region.
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3789299 |
PROBE FOR RADIATION DETECTOR
An elongated probe of materials having free space characteristics, supports, and antenna means at one end and conducting means aligned with its major axis for interconnection with an appropriate...
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3787866 |
DOPPLER ANTENNA CALIBRATION APPARATUS
Apparatus which permits near-field calibration of a doppler antenna in the laboratory avoiding the high costs and uncertainties of flight calibration is shown. The antenna and an associated...
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3787865 |
DISCONE ANTENNA
An antenna comprising a conical element connected at the apex thereof to the outer conductor of an input transmission line, a disc-shaped antenna element connected to the transmission line inner...
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3783448 |
APPARATUS FOR MEASURING ELECTROMAGNETIC RADIATION
This invention relates to a new apparatus for measuring total electromagnetic radiation or exposure to non-ionizing electromagnetic radiation. The apparatus comprises, in combination, an...
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3778837 |
PRECISION CALIBRATION TARGET FOR RADIOMETERS
A radiometer reference target comprising a porous mass of microwave absorbing material having lateral dimensions substantially equal to those of the antenna horn of the radiometer to be calibrated...
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3772700 |
MICRO-WAVE TEST SET AN/SPG-51B RADAR
A microwave test set for checking the operation of a waveguide and its components while the waveguide is still mounted on equipment. A signal of known power level from a variable signal source is...
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3760271 |
MICROWAVE SURVEY METER
A device to measure low level near field microwave power density, such as leakage from a microwave appliance. A radial array of semiconductor diodes functions both as an antenna and a detector. The...
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3753116 |
POCKET SIZE MICROWAVE RADIATION HAZARD DETECTOR
A microwave radiation hazard detector in which CW radiation is detected and converted into a DC voltage whose level is a function of the radiation level. This signal's level is compared with an...
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3732569 |
AERIAL FIELD SIMULATION
Any arbitrary antenna array distribution can be represented as the sum of a symmetric and an antisymmetric function. The radiation at any point in the far field of the aerial array can then be...
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3721900 |
MICROWAVE DETECTION INSTRUMENT AND ANTENNA THEREFOR
An instrument for detecting microwave energy over half a total solid angle in space and capable of measuring either plane or elliptically polarized waves in all directions employs an antenna having...
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3718931 |
AERIAL FIELD MONITORING
The radiated field of a dipole at any point is directly related in amplitude and phase to the current in the dipole arms. This can be sampled by a slot cut in the dipole arm. The voltage across...
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