Download e-book for kindle: Antenna Handbook: Antenna applications by Y.T. Lo, S. W. Lee

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 functions covers the parts of airplane, ships, different huge, complicated environments, satellites, distant sensins, geophysics, medication, course discovering, and AM, tv, and FM broadcasting. DLC: Antennas (Electronics)

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Dispersion curves of fundamental HEll mode of cylindrical dielectric rod. (After Mueller and Tyrell [95J; reprinted with permission from the AT&T Technical Journals, © 1947 AT&T) at the termination. 0 at the termination, where kx is the (local) phase constant of the guided wave and ko is the free-space wave number. From (2a) and (2b) it is evident that the higher the dielectric constant of the antenna, the smaller its cross section and, hence, as a general rule, its weight. On the other hand, Fig.

Horn-launcher transition from metal waveguide to dielectric waveguide. ) *For the numerical analysis the actual taper profile was replaced by a staircase approximation with ten steps. Millimeter-Wave Antennas 17-47 limit, arrays of these antennas can be used. Since the individual array elements have already a substantial directivity, element spacing can be chosen comparatively large so that interelement coupling is minimized. According to Zucker [98], the spacing, b, should be in the range where the lower bound formulates the condition that interelement coupling snould be negligible while the upper bound is determined by the requirement that the first grating lobe should be substantially reduced by multiplication with the element pattern.

The solid curves show the gain and beamwidth of maximum-gain antennas as a function of antenna length L/Ao according to experimental data reported in the literature. ue; the beamwidth is usually slightly smaller in the E-plane and slightly larger in the H-plane [98]. *A formulation of condition (4) appropriate for maximum-gain antennas has been given by Zucker [98). * *Fig. 17 applies not only to tapered-rod antennas but to surface-wave antennas in general. 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.

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

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