By Y.T. Lo, S. W. Lee
Quantity three: Antenna purposes covers the parts of airplane, ships, different huge, complicated environments, satellites, distant sensins, geophysics, drugs, path discovering, and AM, tv, and FM broadcasting. DLC: Antennas (Electronics)
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Extra info for Antenna Handbook: Antenna applications
A concluding remark is concerned with dielectric resonator antennas, a different type of millimeter-wave antenna which has been examined recently . These antennas are mentioned here since, in a broad sense, they are also derived from open millimeter waveguides. Typically, they take the form of short, resonating sections of rectangular or circular dielectric waveguide placed vertically on a metal ground plane. Since these dielectric resonators are not enclosed within metal walls, all energy delivered by the feed system will ultimately be radiated out (except for dielectric and metal losses, which may be significant) and the resonators will act as antennas with relatively narrow bandwidth.
This gain limitation is easy to understand on the basis of the equivalence principle. The polarization current in each volume element of the antenna radiates as a Hertz dipole. The phases of these dipoles are determined by the phase velocity, of the surface wave guided by the antenna. o and 8A. o. 17-40 Applications of the various volume elements of the antenna to the radiation in the forward direction will add constructively only up to a certain length of the antenna. For antennas with a gradual taper the optimum length is approximately determined by the condition (4) If this length is exceeded, destructive interference will occur and a loss of di'rectivity must be expected.
Slotted-waveguide linear array antenna for 50-GHz band. S. Army CECOM, Ft. Monmouth, NJ, and Norden Systems, Norwalk, CT) 17-34 Applications the bandwidth to approximately ±501n percent, where n is the number of array elements . 3. Surface-Wave and Leaky-Wave Antennas Based on Open Millimeter Waveguides Most millimeter waveguides are open guiding structures; to minimize conduction losses and simplify fabrication they do not enclose the guided fields on all sides by metal walls. Hence, if these guides are not excited in the appropriate mode or if the uniformity of the guiding structure is perturbed, energy leakage will occur and part of the guided energy will be radiated into the surrounding medium.