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

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

Technology has complicated to this kind of measure over the past decade that it's been virtually very unlikely to discover up to date insurance of antennas. Antenna instruction manual, edited via of the world's so much distinctive antenna speciallists, offers the main complex antenna conception and designs and demonstrates their software in a large choice of technical fields. they give a outstanding quantity of in-depth information and research on quite a lot of themes, supported through formulation, curves, and effects, in addition to derivations.

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27** shows the normalized phase constant Eant = (f3lko)L as a function of w. Evidently, when w is large, Eant does not deviate significantly from Eeff and the width w of the antenna has little effect on the phase constant 13, which can be approximated by ko VEeff' Returning to Fig. 26 it is seen now that the phase constant 13 of a wide antenna does not significantly vary with the corrugation depth t, provided t and hare 'In the form in which the characteristic equations (9a) and (9b) are presented here, they apply to the fundamental mode of the antenna and to those higher modes whose polarization and symmetry properties are similar to those of the fundamental mode.

O)-WAVELENGTHS 100 Fig. 17. Gain and beamwidth of surface-wave antennas as a function of normalized antenna length. (After Zucker [98]) A problem with maximum-gain antennas is that they have comparatively small pattern bandwidth (±10 percent) and high side lobes no more than -6 dB to-lO dB down from the main peak. Appropriate design of the body taper will solve these problems, though at the expense of a reduced gain [98]. The dashed curves in Fig. 17 characterize surface-wave antennas designed for broad bandwidth and low side lobe levels.

As is true for dielectric-rod antennas, these grating antennas are directly compatible with dielectric waveguides. Additional advantages include ruggedness and a low profile-the antennas can be installed conformally with a (planar) metal surface-and a capability for beam scanning by frequency variation. Per,iodic antennas can have various configurations; recently investigated structutes are shown in Fig. 23. The first of these antennas, Fig. 23a, operates with a dielectric grating in the form of a periodic surface corrugation [125-128].

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