Microwave Antenna Theory And Design by Samuel Silver
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 traces. 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 options and kit.
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Sample text
35) and the relations bet~veen it and the reflection coefficient are 1–7 r . 7. —The further discussion of the transmission line will be partimllarized to the case of a lossless line. The microwave lines to be treated in Chap. 7 can be considered to be lossless over the length of line that enters into the problem of the design af an antenna. 7! l ==–+jrtanpl, q(z) +j 7(2 – 1) = ~tan~i (38) tan @ (39) The transformations have a space periodicity of a half ~vavelength: the impedance and admittance take on the same values at intervals of a half wavelength.
The transmitting antenna also in turn gives rise to a scnttered wave that is partly absorbed I)y the recei~-ing systcm and part]y rescattered. The interaction betwmm the two antennas is thus dl~e to multiple scattering and absorption. 46 CIRCUIT RELATIONS, RECIPROCITY THEOR&lMS [SEC, 212 From the point of view of the transmission lines, the antennas and the external space form a network that couples the lines together. In Fig. 4 and B represent the transmitter and receiver respectively, and O and O’ are arbitrary but fixed reference points on the respective lines.
The preceding sections treat the transmitting and receiving antennas as isolated systems and neglect the significant featlu-e of the interxtion het~veen them. Any discussion of a transmitting pattern implies the presence of a receiving antenna to explore the field; conversely, a discussion of a receiving antenna assumes the existence of a radiating systcm. The interaction between the transmitter and receiver is a res~dt of scattering. Consider a transmitting antenna that, when completely isolated, is matched to its line.