Download Microwave Antenna Theory And Design by Samuel Silver PDF

By Samuel Silver

Survey of microwave antenna layout difficulties. Circuit relatives, 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 straightforward fanned-beam antennas. Shaped-beam antennas. Antenna deploy difficulties. Antenna measurements suggestions and kit.

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31) a is set equal to zero, we get Since r passes through a complete cycle of phase over a half-wavelel,gth section of line, there are two points ~vithin every such interval at which It follolvs from Eq. (30) that at these points the r is a real number. The magnitude of r does impedance and admittance are real numbers. not vary along the line. Consequently, at every point the reflection coefficient is a measure of the po\ver loss arising from the impedance The power carried by the incident wave mismatch at the termination.

The reciprocity theorem \vill be discussed in the Iatter part of this chapter. 2. The Four-terminal Network. et usconsider an arl)itrary netnwrk, free from generators, made 11P of linear bilateral elements. A linear bilateral element is one for ‘i2 ~1 \~hich the relation bet~veen ~oltage ~. -IJour-tcr]rlird network. 3 For convenience the net~~ork \vill be pictured as enclosed in a box and presenting to the outside only a pair This is illustrated schematically of input and a pair of output terminals.

Th&enin’s theorem and the maximum-power transfer condition. and if the reciprocity theorem [Eq. (1 1)] holds for the network, then the transfer impedance coefficients satisfy the reciprocity relation of Eq. (3). 4. —C’onsider a network made up of linear bilateral elements and containing a Th6venin’s theorem states that the current system of generators. through any impedance Z. across a pair of terminals C, D of the network is the same as the current in an impedance Z~ connected across a generator whose emf is the open-circuit voltage across CD (the voltage Ivith Z1.

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