6 Radiation Patterns (cont.) Beam width (or half-power beam width) Measure of directivity of antenna 7. 5 Radiation Patterns Radiation pattern Graphical representation of radiation properties of an antenna Depicted as a two-dimensional cross section Reception pattern Receiving antennas equivalent to radiation pattern 6. 4 Reciprocity In general, the various properties of an antenna apply equally regardless of whether it is used for transmitting or receiving Transmission/reception efficiency Gain Current and voltage distribution Impedance 5. 3 Fundamental Antenna Concepts Reciprocity Radiation Patterns Isotropic Radiator Gain Polarization 4. 2 Introduction An antenna is a transducer that converts radio frequency electric current to electromagnetic waves that are radiated into space In two-way communication, the same antenna can be used for transmission and reception 3.
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