By Y.T. Lo, S. W. Lee
Quantity three: Antenna functions covers the parts of airplane, ships, different huge, advanced environments, satellites, distant sensins, geophysics, drugs, path discovering, and AM, tv, and FM broadcasting. DLC: Antennas (Electronics)
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Additional info for Antenna Handbook: Antenna applications
Applications 17-24 a ANGLE OF OBSERVAnON-DEGREES b Fig. 7. High-performance horn antenna for the 33-GHz band. (a) Horn configuration. (b) H-plane pattern. (c) E-plane pattern. (After Jansen et al. f42/, © 1979 IEEE) precise fabrication techniques and are likely to be expensive. Now and for the immediate future, mechanically scanned fixed-beam antennas appear to be the best choice for many millimeter-wave radar, sensing, and communication uses . A contributing factor is the compactness of millimeter-wave antennas which facilitates rapid mechanical scanning [7-9].
3 dB ~ IIJ 90 ~-20 -20 ANGLE OF OBSERVAnON-DEGREES ~ 60 I ~-3O ca U IIJ 30 Q I ! & ......... 5° r"\ \ \ ~ , l. -30 o 30 90 60 ANGLE OF OBSERVAnON-DEGREES Fig. 19. Dependence of radiation pattern of tapered dielectric-rod antennas on axial length L. (After Kobayashi, Mittra, and Lampe /106/, © 1982 IEEE) 17-44 _. 68 mm. The first of these patterns is that of the feed horn alone; the last pattern shows the onset of main beam distortions. * The pattern of Fig. 18 was taken with a pyramidal antenna.
Diffraction at this grating transforms a guided mode into a leaky mode and, hence, the waveguide into an antenna. The new uniform leaky-wave antennas are based on low-loss millimeter waveguides (except for the microstrip antenna), and the leakage of radiation can be caused in two different ways. One way is to perturb the structure longitudinally Millimeter-Wave Antennas 17-35 (along the guiding direction) in an asymmetric but uniform fashion. The difference here from the grating dielectric antennas is that there the perturbation is periodic but here it is uniform, so that these antennas have the outward appearance of a uniform open waveguide.