Archimedean spiral


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Related to Archimedean spiral: Logarithmic spiral

Archimedean spiral

[¦är·kə¦mēd·ē·ən ′spī·rəl]
(mathematics)
A plane curve whose equation in polar coordinates (r, θ) is rm = am θ, where a and m are a positive or negative integer.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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References in periodicals archive ?
By optimizing all the aforementioned parameters on a 50 mm dia., simple Archimedean spiral antenna, the gain and axial ratio at 2 GHz were still -6 dBi (<-5 dBi) and 5dB (>3dB) while the VSWR was<2:1 throughout the band.
Hybrid Utilization of Loading Techniques and Cavity Groove for Performance Enhancement of the UWB (2-18 GHz) Spiral Antenna
An approach based on the Archimedean spiral is proposed to generate OAM carrying beams in the RF regime.
Broadband Generation of Orbital Angular Momentum Carrying Beams in RF Regimes
Figure 10(a) displays the acoustic maps obtained for an Archimedean spiral array and (b) shows those obtained for a star array for a frequency range extending from 500 to 4000 Hz, inclusive.
Computational Acoustic Beamforming for Noise Source Identification for Small Wind Turbines
where [beta] = arctan(-[[theta].sub.2]/[gamma]) is a tangent angle of the Archimedean spiral gear, [gamma] is a reduction gear ratio of the secondary motor, and a = [mu]R = R[[theta].sub.2]/2[pi] is a distance from the pivot point to the joint center.
Adaptive Neural Network Control of Serial Variable Stiffness Actuators
Handzic started with Archimedean spirals and logarithmic spirals.
Spiral steps: the spirals unique characteristics may help disabled people get where they're going
Round spiral antennas are generally designed by using Archimedean spiral geometries which have linear growth rates and frequency independent radiative characteristics.
New trends in energy harvesting from Earth long-wave infrared emission
However, all of the Archimedean spiral antennas referred to above cannot eliminate the restraint of the feed balun, in which the structure increases the height of the antenna profile and the complexity of the antenna.
Design of a UHF antenna for partial discharge detection of power equipment
"A two-arm Archimedean spiral antenna with bent ends", IEEE-APS Topical Conference on Antennas and Propagation in Wireless Communications (APWC), p 535-8, (2012).
DESIGN AND SIMULATION OF A FOUR-ARM SPIRAL ANTENNA FOR GPS
The spiral antenna has a two-armed Archimedean spiral with four numbers of turn.
Archimedean spiral antenna with band-notched characteristics
Controlled trajectory curves of helical segment are structured by applying the Logarithmic spiral and Archimedean spiral equations.
Multi-valve intake port parametric design and performance optimization of the horizontal diesel engine/ Horizontalaus dyzelinio variklio daugiavoztuvio isiurbimo kanalo projektavimas ir charakteristiku optimizavimas
In [1], Aczel and Alsina defined the following n-spiral function F(a, [theta]) and discuss the conditions under which an n-spiral function is the Archimedean spiral a[theta].
Some dense subsets of real numbers and their applications
It's a perfect fit to an Archimedean spiral: what you get when material streams at a constant speed from a source spinning at a constant rate, such as water from a lawn sprinkler.
A ghostly cosmic pinwheel

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