By Samuel Silver
Survey of microwave antenna layout difficulties. Circuit kinfolk, reciprocity theorems. Radiation from present distributions. Wave fronts and rays. Scattering and diffraction. Aperture illumination and antenna styles. Microwave transmission strains. Microwave dipole antennas and feeds. Linear array antennas and feeds. Waveguide and horn feeds. Dielectric and metal-plate lenses. Pencil-beam and easy fanned-beam antennas. Shaped-beam antennas. Antenna deploy difficulties. Antenna measurements strategies and kit.
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Extra info for Microwave Antenna Theory And Design
Sample text
9 so as to give directly the change in the phase of r corresponding to a displacement along the line from a voltage-nlinimllrn point. All voltage-minimum points must be on the segment of the real axis between zero and unity; this is therefore taken as the zero-phase line. The separation bet~veen a voltage minimum and the adjacent maximum on a line is 1 = k/4, which corresponds to a phase shift 2D1 = 180°. %fS [SEC. 29 lie on the real axis bet\veen 1 to cc ; hence this segment of the real axiti is taken as the phase line @ = 180°.
The first If the dimensions effect is known as absorption; the second as scattering. of the antenna are large compared with the wavelength, the interaction between the scattered wave field and the incident wave is such as to give rise to a rather sharply defined shadow region behind the antenna, that is, on the side of the antenna away from the source of the incident wave. In this direction the scattered wave set up by the induced distribution on the antenna is out of phase with the incident wave; the destructive interference between the tJro fields results in the removal of energy from the incident watie.
For a nonlossy line ~ = j~; on substitution into the above, the network parameters are found to be Z,, = ZZ2 = –jZO cot fil, Z12 = Z,, = –jZO csc fit. 10. —The impedance relations between a transmitting or receiving antenna and its transmission line are of particular interest. In the follo~ying sections several general ideas that are associated with the analysis of these relations will be discussed. I,et us consider first the case of a line feeding a transmitting antenna. It will be assllmed for the presenk that the antenna is isolated—in particular, that it is removed from all other antennas—so that interactions with other systems need not be considered.