New PDF release: Antenna Handbook: Antenna applications

By Y.T. Lo, S. W. Lee

ISBN-10: 0442015925

ISBN-13: 9780442015923

ISBN-10: 0442015933

ISBN-13: 9780442015930

ISBN-10: 0442015941

ISBN-13: 9780442015947

ISBN-10: 0442015968

ISBN-13: 9780442015961

Quantity three: Antenna purposes covers the parts of airplane, ships, different huge, advanced environments, satellites, distant sensins, geophysics, medication, path discovering, and AM, tv, and FM broadcasting. DLC: Antennas (Electronics)

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Example text

I § Q I q;- Q S30 I § ~ Z ~ ~ 10 IIQ 10~------+---+--+~-+-++++---~ __~~~~~~r-~~ MAXIMUM-GAIN ANTENNAS DESIGN FOR LOW SIDE LOBES AND BROAD BANDWIDTH I 0~1------~--~--~~~~~------~2~0--~--~~~~~~~100~0 NORMALIZED ANTENNA LENGTH (L/>-O)-WAVELENGTHS Fig. 17. Gain and beamwidth of surface-wave antennas as a function of normalized antenna length. (After Zucker {98J) A problem with maximum-gain antennas is that they have comparatively small pattern bandwidth (±1O percent) and high side lobes no more than -6 dB to -10 dB down from the main peak.

The new uniform leaky-wave antennas will be reviewed with respect to their operating principles and applicational aspects in and near the millimeter-wave region. These antennas are still under study and available design information was limited when this chapter was first written. Latest available information can be found in a comprehensive report [221] that was prepared very recently. The report also contains the results of several studies concerned with linear arrays of such leaky-wave line-source antennas, where the individual antennas in the array are fed in parallel from one end in phased-array fashion, permitting phase-shift scanning in the cross plane.

On the other hand, for very long tapered-rod antennas (fed by a dielectric waveguide of the same permittivity), the transformation of a surface wave traveling along the structure from a strongly bounded wave into a free-space wave will proceed very gradually and little reflection will occur. One may conclude that such antennas will radiate a smooth, highly directive pattern. But no theoretical or experimental data to confirm or refute this view seem to be available. L. L. ; = UJ ~ 0 CI. L. UJ = 0 b 0 1 2 3 4 5 6 ASPECT RATIO [(b-a)/h) Fig.

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Antenna Handbook: Antenna applications by Y.T. Lo, S. W. Lee

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