Antenna Handbook: Volume III Applications by F. Schwering, A. A. Oliner (auth.), Y. T. Lo, S. W. Lee

By F. Schwering, A. A. Oliner (auth.), Y. T. Lo, S. W. Lee (eds.)

Technology has complex to one of these measure over the past decade that it's been virtually most unlikely to discover up to date assurance of antennas. Antenna instruction manual, edited via of the world's so much exotic antenna speciallists, provides the main complex antenna concept and designs and demonstrates their software in a large choice of technical fields. they give a awesome volume of in-depth information and research on a variety of subject matters, supported by way of formulation, curves, and effects, in addition to derivations.

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41H1- ~ -40~~~~--~--~~--~~--~--~~--~----~--~~LL~ -lBO -144 -lOB -72 -36 0 36 72 lOB ANGLE OF OBSERVATION-DEGREES c Fig. 11, continued. improved side lobe performance, and the length of feed waveguide runs is reduced, leading to enhanced efficiency. 75 cm and provided a gain of 27 dB corresponding to a beamwidth of 2° in the H-plane and 30° in the E-plane. H-plane side lobes were -26 dB below the main beam, and it appears that by careful design a side lobe level as low as - 35 dB can be achieved both in the Eand H-planes [83].

Zucker has described a procedure based on physical reasoning and experimental evidence for the design of surface-wave antennas of maximum-gain [98]. In the case of tapered-rod antennas the basic configuration of a maximum-gain antenna takes the form shown in Fig. 15c. It includes a feed taper, a body taper, a straight section, and a terminal taper. The feed taper establishes a surface wave which is assumed to radiate continuously as it travels along the body taper and the straight section. The terminal taper reduces reflections which would be caused by an abrupt discontinuity.

Array is the 3-dB beamwidth in degrees in the plane of the array. Side lobes can be controlled by tapering the excitation of the elements. The bandwidth of the array will be smaller than that of the individual elements, probably by 5 percent [98]. The array gain, of course, can be further increased by the use of planar arrays (volume arrays) of tapered-rod antennas. It should be noted, however, that the attainable gain is determined by the overall array aperture and, therefore, is not much higher than in the case of a dipole array of the same aperture size.

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