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

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

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A waveguide with an axial sequence of longitudinal slots represents a collinear array, and such arrays are useful as omnidirectional antennas. For this application the waveguide axis will usually be oriented vertically, and it is desirable that maximum radiation occurs in the horizontal plane. This condition can be satisfied by operating the waveguide as a resonant array where all slots are excited in equal phase. show a certain amount of directivity. Since the waveguide has limited width this directivity will not be prohibitive, but achieving a truly omnidirectional pattern requires special care.

There, the dimensions of the guide are chosen such that it supports the first higher mode, and an appropriate feed arrangement ensures that only this mode is excited. In the following, tapered dielectric-rod antennas and periodic dielectric antennas are discussed in some detail. These antennas are already of substantial practical interest since dielectric waveguides will be employed in many applications throughout the millimeter-wave band and, in some form, are likely to be used as the basic transmission medium for integrated millimeter-wave devices operating above 100 GHz.

These uniform leaky-wave antennas are less versatile than the periodic ones, however, since they can radiateĀ· only into the forward quadrant, whereas the periodic leaky-wave antennas can radiate into the backward quadrant as well.. The second way in which radiation can be produced on uniform open waveguides is to employ a higher mode. The fundamental mode on these guides is always purely bound (if the guiding structure is unperturbed), but higher modes can leak, although sometimes only over a restricted frequency range.

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