2 edition of Extrapolation range measurements for determining antenna gain and polarization found in the catalog.
Extrapolation range measurements for determining antenna gain and polarization
Andrew G Repjar
by U.S. Dept. of Commerce, National Bureau of Standards in [Washington, D.C.]
Written in English
|Statement||Andrew G. Repjar, Allen C. Newell, Douglas T. Tamura|
|Series||NBS technical note -- 1311|
|Contributions||Newell, Allen C, Tamura, Douglas T, United States. National Bureau of Standards|
|The Physical Object|
|Pagination||vi, 69, 5, 4 p. :|
|Number of Pages||69|
FA R - F I E L D Far-field Antenna Measurements For certain applications, far-field antenna measurements are the preferred technique for determining the amplitude and/or phase characteristics of an AUT. Low gain antennas operating below 1 GHz, and › 百度文库 › 互联网. J. D. Hunter and I. G. Morgan, “Gain measurements in the National Measurement Laboratory anechoic chamber,” Dig. Seminar on Electromagnetic Antenna and Scattering Measurements, CSIRO Division of Applied Physics, pt. II, pp. –, National Measurement Laboratory, Sydney,
The Method is based on the well-known extrapolation range technique. The process is to obtain the polynomial curve that is used to get the far field gain in the extrapolation gain procedure, and to perform an interpolation to get the gain at 1 m. The results show that some data in the far field must be collected during the extrapolation ?category_id=29&page= • Fundamental equation for gain: • In general, an increase in gain is accompanied by a decrease in beamwidth, and is achieved by increasing the antenna size relative to the wavelength. • With regard to radar, high gain and narrow beams are desirable for long detection and tracking ranges and accurate direction measurement. 4/2, effective
An antenna (or aerial) is an electrical device which converts electric currents into radio waves, and vice is usually used with a radio transmitter or radio transmission, a radio transmitter applies an oscillating radio frequency electric current to the antenna's terminals, and the antenna radiates the energy from the current as electromagnetic waves (radio waves) (radio)/en-en. The polarization (or polarisation) of electromagnetic (EM) waves or fields is introduced. This leads into the discussion of antenna polarization. Linear polarization (horizontal or vertical pole) is discussed. RHCP and LHCP (left and right hand circular polarizations) are
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Gain values indicated by the * were obtained by the extrapol ati on method 66 List of Tables Table Page 1 Data and errors for X-band antennas 43 2 Data and errors for mn-wave antennas 44 3 Results of polarization measurements 49 vi Extrapolation Range Measurements for Determining Antenna Gain and Polarization Andrew G.
Repjar, Allen C. Newell Get this from a library. Extrapolation range measurements for determining antenna gain and polarization. [Andrew G Repjar; Allen C Newell; Douglas T Tamura; United States. National Bureau of Standards.] Standards and Measurements.
Calibration Services; Laboratory Accreditation (NVLAP) Extrapolation Range Measurements for Determining Antenna Gain and Polarization. Published. August 1, Author(s) Andrew G.
Repjar, Allen C. Newell, Douglas T. Tamura. :// Extrapolation range measurements for determining antenna gain and polarization Item Preview Abstract: A new technique is described for determining power gain and polarization of antennas at reduced range distances.
It is based on a generalized three-antenna approach which, for the first time, permits absolute gain and polarization measurements to be performed without quantitative a priori knowledge of the :// Introduction to Antenna Calibration Methods Used at the Boeing Metrology Laboratory Field Strength Facility They are based on the gain extrapolation technique developed at the National Institute of Standards and Technology (NIST).
Newell, D. Tamura, Extrapolation Range Measurements for Determining Antenna Gain and Polarization Contents Page uction 1 tionsandBasicConceptsfromaMeasurement PointofView 3 AntennaScatteringMatrixParameters 3 GeneralizationoftheThree Extrapolation Range Measurements for Determining Antenna Gain and Polarization" National Bureau of Standards NBS Technical Note ,United States Department of Commerce Aug A G Repjar Antenna Gain and Polarization at reduced distances by an extrapolation technique” IEEE Transaction on Antennas and Propagation.
Vol. 21, No 4, July pp.  A.G. Repjar, A. Newell, and D. Tamura “Extrapolation Range Measurements for Determining Antenna Gain and Polarization” - A Calibration Method Using.
Radiaton Pattern and Gain Measurements The second antenna measurements section discusses how to perform the most fundamental antenna measurement - determining an antenna's radiation pattern and extracting the antenna gain.
Phase Measurements The third antenna measurements section focuses on determining phase information from an antenna's AUTOMATED THREE-ANTENNA POLARIZATION MEASUREMENTS USING DIGITAL SIGNAL PROCESSING John R. Jones and Doren W. Hess Abstract In this paper we present a three-antenna measurement procedure which yields the polarization of an unknown antenna to an accuracy comparable to that of the improved method of Three-Antenna Polarization.
Antenna Measurement Theory. RELATED TERMS. Mixers. The mixer is a critical component in the instrumentation of antenna measurements. It converts RF power at one frequency into power at another frequency to make signal processing easier and less expensive. It is a nonlinear device, which mixes the input RF Precision Alignment of Two mm-Wave Antennas Using an Improved Optical Alignment Tool Article in IEEE Antennas and Propagation Magazine 54(4) Near-field vs Far-field Any antenna can be successfully measured on either a near-field or far-field range, with appropriate Cost of facility implementation is a critical determining factor in range selection.
Far-field In Dan Slater wrote a comprehensive book titled "Near-Field Antenna Measurements" about the?&cc=US&lc=eng. The first category deals with one of the most important antenna parameters-the input impedance. The second category is a very broad and equally important one, with many subcategories, such as measurements of beamwidth, minor lobe level, gain, and polarization characteristics.
Measurements of efficiency and noise may also be desired in some Two novel and accurate techniques for determining the axial ratio of a circularly polarized antenna were presented nearly 20 years ago by Stutzman and Overstreet.
1 Their first method involves the use of two single or dual circularly polarized receiving antennas with measurements of maximum and minimum cross-polarization isolation values for The second antenna measurements section discusses how to perform the most fundamental antenna measurement - determining an antenna's radiation pattern and extracting the antenna gain.
Phase Measurements. The third antenna measurements section focuses on determining phase information from an antenna's radiation This extrapolation correction factor would be only applicable to 3 meter vertical polarization measurements for EUT heights up to meters and the same approach would have to be taken to obtain the horizontal polarization extrapolation correction › 百度文库 › 互联网.
References. 1) Marti-Canales, J.: `Time domain antenna measurements in compact ranges and small anechoicchambers', NovemberPhD, Technical University of :// The polarization of an antenna is defined as the polarization of the electromagnetic wave radiated by the antenna along a Antenna gain is independent of reflection losses resulting from impedance mismatch.
it is desirable because of various practical considerations to make antenna measurements at as short a range as possible. Since the. Antenna Basic Concepts ANTENNA An antenna is a device to transmit and/or receive electromagnetic waves.
Electromagnetic waves are often referred to as radio waves. Most antennas are resonant devices, which operate efficiently over a relatively narrow frequency band. An antenna must be tuned (matched) to the same frequency band as the radio concepts and techniques of antenna pattern measure-ment and evaluates the benefits and drawbacks of var-ious measurement methods.
The concepts relating to near-field and far-field pattern testing are discussed as well. The second article (see page 34) presents the theory and equations governing antenna properties and Th e gain or directivity of an antenna is the ratio of the radiation inten sity in a given direction to the radiation intensity averaged over all directions.
Quite often directivity and gain are used interchangeably. The difference is that directivity neglects antenna losses such as dielectric, resistance, polarization, and VSWR ://~anita/new/papers/militaryHandbook/