equiangular spiral


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Related to equiangular spiral: Hyperbolic spiral, equiangular spiral antenna

equiangular spiral

[¦ē·kwē¦aŋ·gyə·lər ′spī·rəl]
(mathematics)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

rhumb line

rhumb line
A rhumb line crosses all meridians at the same angle.
A line on the surface of the earth that cuts all meridians at the same angle. It appears as a curved line on the surface of a sphere. Only one such line may be drawn through any two points. Although this is not the shortest distance, the direction is constant. Normally, flights of less than 1,000 NM distance follow the rhumb-line track, whereas flights of a longer distance follow the great-circle track. Also called an equiangular spiral, loxodrome, loxodromic curve, or Mercator track.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
The Archimedean spiral, planar equiangular spiral, sinuous and Foursquare were chosen to be evaluated for broad bandwidth scanning arrays based on their small size, low profile, uniform E- and H-plane patterns and broad bandwidth.
The planar equiangular spiral has a half-power beamwidth of 70[degrees], which is similar to the Archimedean spiral beamwidth of 75[degrees].
The Archimedean and equiangular spirals are circularly polarized elements capable of a very wide bandwidth.
The Archimedean and planar equiangular spirals produce circular Polarization.
Yamauchi, "Equiangular spiral antenna backed by a shallow cavity with absorbing strips," IEEE Transactions on Antennas and Propagation, vol.
We take an equiangular spiral antenna as an example to make this process more detailed.
With the above optimization process, the parameters of the equiangular spiral antenna structure and the parasitic layers can be optimized at the same time.
After optimization, the top layer is an equiangular spiral antenna as shown in Figure 4(a) and the two parasitic layers are shown in Figures 4(b) and 4(c), respectively.
With H = 12.8 mm, L = 44.2 mm, and the maximum radius of the equiangular spiral antenna, 13.75 mm, this semiautomatic designed antenna has a low-profile structure, which is suitable to be installed on plane platform.