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The isotropic antenna The 3-dB beamwidth of the parabolic dish antenna is approximated by BW and the focal length by F D2 16d 70 D
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The antenna pattern radiated by the antenna is similar to Fig 19-23B With horn illumination, the sidelobes tend to be 23 to 28 dB below the main lobe, or 10 to 15 dB below isotropic It is found that 50 percent of the energy radiated by the parabolic dish is within the 3-dB beamwidth, and 90 percent is between the first nulls on either side of the main lobe
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Parabolic (y2 ux) reflector surface y B
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MF u u (0,0) F (Focal point) x Advancing wavefronts D
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Directrix A 19-28 Ray tracing shows operation of parabolic antenna
408 Microwave waveguides and antennas If a dipole element is used for the feed device, then a splash plate is placed 4-wavelength behind the dipole in order to improve illumination The splash plate must be several wavelengths in diameter, and is used to reflect the backlobe back toward the reflector surface When added to the half-wave phase reversal inherent in the reflection process, the two-way quarter-wavelength adds another halfwavelength and thereby permits the backwave to move out in phase with the front lobe wave Parabolic dish feed geometries Figure 19-29 shows two methods for feeding parabolic dish antennas, regardless of which form of radiator (horn, dipole, etc) is used In Fig 19-29A we see the method in which the radiator element is placed at the focal point, and a waveguide (or transmission line) is routed to it This method is used in low-cost installations such as home satellite TV receive-only (TVRO) antennas Figure 19-29B shows the Cassegrain feed system This system is modeled after the Cassegrain optical telescope The radiator element is placed at an opening at the center of the dish A hyperbolic subreflector is placed at the focal point, and it is used to reflect the wavefronts to the radiator element The Cassegrain system results in lower-noise operation because of several factors: less transmission line length, lower sidelobes, and the fact that the open horn sees sky instead of earth
Reflector
Primary feed horn
19-29A Parabolic antenna conventional feed Waveguide or transmission line
The isotropic antenna
Main reflector
Primary feed horn Subreflector Waveguide Incoming wavefront
19-29B Parabolic antenna Cassegrain feed
(which has lower temperature); on the negative side, galactic and solar noise might be slightly higher on a Cassegrain dish Figure 19-30A shows the monopulse feed geometry In this system, a pair of radiator elements are placed at the focal point, and fed to a power splitter network that outputs both sum and difference signals (Fig 19-30B) When these are combined, the resultant beam shape has improved 3-dB beamwidth as a result of the algebraic summation of the two
Array antennas
When antenna radiators are arranged in a precision array, an increase in gain occurs An array might be a series of dipole elements, as in the broadside array of Fig 19-31 (which is used in the UHF region), or a series of slots, horns, or other radiators The overall gain of an array antenna is proportional to the number of elements, as well as the details of their spacing In this, and other antennas, a method of phase shifting is needed In Fig 19-31, the phase shifting is caused by the crossed feeding of the elements, but in more modern arrays, other forms of phase shifter are used Two methods of feeding an array are shown in Fig 19-32 The corporate feed method connects all elements, and their phase shifters, in parallel with the source The branch feed method breaks the waveguide network into two (or more) separate paths Solid-state array antennas Some modern radar sets use solid-state array antennas consisting of a large number of elements, each of which is capable of shifting the phase of a microwave input signal Two forms are known: passive (Fig 19-33A) and active (Fig 19-33B) In the passive type of element, a ferrite (or PIN diode) phase shifter is placed in the transmission path between the RF input and the radiator element (usually a slot) By changing the phase of the RF signal selectively, it is possible to form and steer the beam at will A 3-bit (ie, three discrete state) phase
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