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Antenna measurement techniques refers to the testing of antennas to ensure that the antenna meets specifications or simply to characterize it. Typical parameters of antennas are gain, bandwidth, radiation pattern, beamwidth, polarization, and impedance.
The antenna pattern is the response of the antenna to a plane wave incident from a given direction or the relative power density of the wave transmitted by the antenna in a given direction. For a reciprocal antenna, these two patterns are identical. A multitude of antenna pattern measurement techniques have been developed. The first technique developed was the far-field range, where the antenna under test (AUT) is placed in the far-field of a range antenna. Due to the size required to create a far-field range for large antennas, near-field techniques were developed, which allow the measurement of the field on a surface close to the antenna (typically 3 to 10 times its wavelength). This measurement is then predicted to be the same at infinity. A third common method is the compact range, which uses a reflector to create a field near the AUT that looks approximately like a plane-wave.
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Antennameasurement techniques refers to the testing of antennas to ensure that the antenna meets specifications or simply to characterize it. Typical...
diode detectors; frequency selective measurements: in which the measurement system consists of a field antenna and a frequency selective receiver or...
The AntennaMeasurement Techniques Association (AMTA) is a non-profit professional organization for members involved in research and development of antenna...
The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel (B). It expresses the ratio of two values of a power or root-power...
and telecommunications a dipole antenna or doublet is one of the two simplest and most widely-used types of antenna; the other is the monopole.[full...
property of the antenna. For other types of antenna the radiation efficiency is less easy to calculate and is usually determined by measurements. In the case...
radiator. Fresnel number Fresnel diffraction and Fraunhofer diffraction Antennameasurement v t e Eugene F. Knott, "Radar Cross Section", Second Edition...
The antenna chosen, however, is based on the best signal-to-noise ratio (SNR) among the received signals. This requires that a pre-measurement take place...
transmitting antenna, or the result of radiation scattering off an object. Non-radiative near-field behaviors dominate close to the antenna or scatterer...
the RF current clamp. For radiated emission measurement, antennas are used as transducers. Typical antennas specified include dipole, biconical, log-periodic...
in the radio or microwaves domain, a transmitting antenna, a receiving antenna (often the same antenna is used for transmitting and receiving) and a receiver...
In radio systems, many different antenna types are used whose properties are especially crafted for particular applications. Most often, the greatest...
wave equation by means of a simple slow-evolution approximation. Antennameasurement Bioelectromagnetics Bolometer CONELRAD Electromagnetic pulse Electromagnetic...
provide high-accuracy measurements by using a fixed base station and a second roving antenna. The position of the roving antenna can be tracked. The theodolite...
history of the charge distribution affects the fields at later times. Antennameasurement Electromagnetic four-potential Jefimenko's equations Liénard–Wiechert...
antenna and a suitable oscilloscope, and he presented his new system in 1926. In spite of the system being presented publicly, and its measurements widely...
(1994). A 550 GHz Near-field AntennaMeasurement System for the NASA Submillimeter Wave Astronomy Satellite. AntennaMeasurement Techniques Association Conference...
efficient antenna averaged over all directions is unity, or 0 dBi. In EMF measurement applications, an isotropic receiver (also called isotropic antenna) is...
chamber or another type of antenna test range (see Antennameasurements). The antenna is then measured using a second antenna test facility. The results...
In the field of antenna design the term radiation pattern (or antenna pattern or far-field pattern) refers to the directional (angular) dependence of...
temperature as 3.5 K, as they experimented with the Holmdel Horn Antenna. The new measurements were accepted as important evidence for a hot early Universe...
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