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1. |
Record Nr. |
UNINA9910484432603321 |
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Autore |
Kalashnikov Vadim Serafimovich |
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Titolo |
Near-field antenna measurements : calculations and facility design / / Vadim Serafimovich Kalashnikov [et al.] |
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Pubbl/distr/stampa |
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Singapore : , : Springer, , [2021] |
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©2021 |
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ISBN |
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Descrizione fisica |
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1 online resource (163 pages) |
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Collana |
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Springer Aerospace Technology |
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Disciplina |
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Soggetti |
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Microwave antennas - Testing |
Antennas (Electronics) - Testing |
Near-fields - Measurement |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Nota di contenuto |
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Intro -- Preface -- Introduction -- Contents -- Symbols and Abbreviations -- 1 Radio Characteristics of Antennas -- 1.1 The Role of Antennas in Radio Systems -- 1.2 The Structure of Electromagnetic Fields Excited by the Antenna -- 1.2.1 Types of Variable Electromagnetic Fields Excited by the Antenna in the Surrounding Space -- 1.2.2 Near-Field and Far-Field Regions of the Antenna -- 1.3 Internal Parameters of Transmitting Antennas -- 1.3.1 The Balance of Active and Reactive Power in the Antenna -- 1.3.2 Input Impedance of the Antenna -- 1.3.3 The Efficiency of the Antenna -- 1.3.4 The Parameters that Characterize the Match of the Antenna Input -- 1.3.5 The Conclusions from Section 1.3 -- 1.4 The External Parameters of Transmitting Antennas -- 1.4.1 The Amplitude and Power Radiation Pattern -- 1.4.2 A Phase Radiation Pattern, the Phase Front and the Phase Center of the Antenna -- 1.4.3 Polarization Characteristic -- 1.4.4 The Directivity and Gain -- 1.5 Radio Characteristics of Receiving Antennas -- 1.5.1 The Identity of Some Radio Characteristics of Antennas in the Transmission and Reception Modes -- 1.5.2 The Directivity, Gain, and the Effective Area of the Receiving Antenna -- 1.5.3 The Noise Temperature of the Antenna -- References -- 2 Methods of Measurement of Radio Characteristics of Antennas (Brief Overview) -- 2.1 Introduction -- 2.2 |
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Measurements in the Far Zone -- 2.2.1 Outdoor Far-Field Range Method -- 2.2.2 The Aerial Method -- 2.2.3 The Radio Astronomy Method -- 2.3 The Compact Antenna Test Range Method (CATR, the Collimator Method) -- 2.4 The Near-Field Measurement Method -- 2.5 The Combined Method -- References -- 3 Planar Near-Field Antenna Measurements: Calculation Expressions -- 3.1 Electrodynamic Fundamentals of the Amplitude-Phase Measurements -- 3.2 Derivation of Calculating Formulas Based on the Kirchhoff Approximation. |
3.3 Analysis of Calculating Expressions Based on the Solution of a Homogeneous Wave Equation -- 3.4 Discrete Analogs of Integral Transforms -- 3.5 Probe Correction -- 3.6 Gain Measurement -- 3.7 Methods for Numerical Calculation of Integral Sums -- 3.8 Measurement Errors When Scanning on a Planar Surface -- References -- 4 Planar Near-Field Facility: Electrical and Mechanical Parts, Software -- 4.1 Generalities -- 4.2 Facility Block Scheme -- 4.3 Mechanical Part of the Facility -- 4.4 Linear Encoders -- 4.4.1 Principle of Operation of the Optoelectronic Linear Encoders -- 4.4.2 Output Codes of the Absolute Encoders -- 4.5 Rotary Supports -- 4.6 Probes and Variants of Its Mounting -- 4.6.1 Dipoles and Loop Probes -- 4.6.2 Open-Ended Waveguide Probes -- 4.6.3 Log-Periodic Antenna Probes -- 4.6.4 Probe Feeding Systems -- 4.7 Ampliphasemeters -- 4.8 DUT Aligning -- 4.9 Facility Software -- 4.10 Instrumental Measurement Errors -- 4.11 The Time Budget for Automated Measurements -- References -- 5 Spherical Near-Field Antenna Measurements -- 5.1 Problem Statement, Basic Coordinate Systems -- 5.2 Selecting the Size of the Scan Area and the Radius of the Measurement Sphere -- 5.3 The Algorithm to Calculate RP Based on the Measurement Results -- 5.4 Probe Correction -- 5.5 Algorithms for Calculating Antenna Directivity and Gain Based on Measurement Results -- 5.6 Algorithm for Calculating Antenna Aperture Field Based on Spherical Amplitude-Phase Measurements -- 5.7 Errors in Spherical Measurements -- 5.8 Kinematic Schemes of the Spherical Near-Field Facilities -- References -- 6 Antenna Testing -- 6.1 Tests Purpose and Objective -- 6.2 Laboratory Tests -- 6.3 Mechanical Tests -- 6.4 Climatic Tests -- 6.5 Flight Tests -- 6.6 Methods for Antenna Radiation Pattern Measurement at Model Aircrafts -- References. |
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Sommario/riassunto |
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This book is useful both for those who want to get initial information on the measurement of the antenna parameters, and for specialists directly involved in the experimental determination of the antenna parameters from the results of measuring the amplitude-phase distribution in the near zone of the antennas. Currently, the near-field method is the most common one for antenna measurements. In most books, an academic approach is given to the issue under consideration and it is difficult to use them for the direct organization of measurements. In many others, specific narrow issues are considered that are accessible to understanding only by highly qualified engineers/readers. The purpose of this book is to get rid of the above disadvantages by offering the reader a more accessible exposition and formulas by which appropriate computer programs can be written with minimal effort. The contents of this book allow interested specialists to be not only users of the near-field measuring facilities, but also help in understanding the principles of their work. This book is intended for engineers and specialists whose activities are related to experimental testing of radio characteristics of complex antenna systems, especially near-field measurements, and is also useful as a textbook for senior students in the field of "radioelectronics" and "radiophysics." |
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2. |
Record Nr. |
UNINA9910697051003321 |
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Titolo |
Intelligent engine systems work element 1.3 [[electronic resource] ] : sub system health management / / Malcolm Ashby ... [and others] |
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Pubbl/distr/stampa |
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Cleveland, Ohio : , : National Aeronautics and Space Administration, Glenn Research Center, , [2005] |
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Descrizione fisica |
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1 online resource (v, 29 pages) : illustrations |
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Collana |
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Altri autori (Persone) |
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Soggetti |
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Propulsion system configurations |
Fault detection |
Lubrication |
Maintenance |
Health physics |
Fuel systems |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Note generali |
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Title from title screen (viewed on Jan. 5, 2011). |
"October 2005." |
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3. |
Record Nr. |
UNINA9910246750103321 |
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Titolo |
Årbok / / det Kongelige Norske videnskabers selskab |
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Pubbl/distr/stampa |
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Trondheim, Norway, : DKNVS, 2004- |
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Descrizione fisica |
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Soggetti |
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Science - Norway |
Science |
Directories. |
Periodicals. |
Norway |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Periodico |
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Note generali |
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4. |
Record Nr. |
UNIORUON00080506 |
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Titolo |
African studies in social movements and democracy / Edited by Mahmood Mamdani, Ernest Wamba-dia-Wamba |
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Pubbl/distr/stampa |
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ISBN |
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Descrizione fisica |
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Disciplina |
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Soggetti |
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AFRICA - Condizioni sociali |
MOVIMENTI POLITICI - Africa |
STORIOGRAFIA AFRICANA |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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