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Practical Antenna Handbookall previous material was reviewed for accuracy and relevance. Additional material was added for the following topics: • Wire antenna construction methods • Antenna modeling software (miniNEC, WinNEC, and EZNEC for Windows) • Antenna noise temperature • Antennas for radio astronomy • Antennas for Radio ...
7.1. Réflexion des ondes depuis la surface de la terre 73 7.2. Les conditions du sol 76 7.3. Infuence de la hauteur de l‘antenne 90 7.4. Impact du terrain 100 7.5. Antennes par la mer 101 7.6. Impact de la couverture terrestre 102
1. An antenna may be a piece of conducting material in the form of a wire, rod or any other shape with excitation. 2. An antenna is a source or radiator of electromagnetic waves. 3. An antenna is a sensor of electromagnetic waves. 4. An antenna is a transducer. 5. An antenna is an impedance matching device. 6.
1.4.2 Loop Antennas 9 1.4.3 Aperture Antennas 10 1.4.4 Reflector Antennas 10 1.4.5 Array Antennas 11 1.4.6 Modern Antennas 11 1.5 Organization of the Book 12 1.6 Problems 13 References 13 2 Antenna System-Level Performance Parameters 15 2.1 Radiation Pattern 15 2.1.1 Field Regions 16 2.1.2 Three-Dimensional Radiation Pattern 17 2.1.3 Planar ...
The antenna parameters describe the antenna performance with respect to space distribution of the radiated energy, power efficiency, matching to the feed circuitry, etc.
3 4π = = 1.761 dB D0 = 8π/3 2 Since the half-power beamwidth is equal to 90 , then the directivity based on (2-33a) is equal to 101 = 1.4825 = 1.71 dB D0 = 90 − 0.0027(90)2 while that based on (2-33b) is equal to D0 = −172.4 + 191 0.818 + 1/90 = 1.516 = 1.807 dB The value of n and the three values of the directivity can also be obtained ...
To create a basic answer and set up some reasonable expectations, we should survey all of the HF amateur bands. Therefore, I shall sample each amateur band, jotting down some basic information and creating both elevation and azimuth patterns for the antennas.
