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@@ Line 1: / Line 1: @@
-{{no footnotes|date=May 2012}}
+== 01/25/11  NEW MEMBERS  Hi all Nike Trainers Usa ==
-[[Image:Traqueur acquisition.JPG|thumb|Array of four axial-mode helical antennas used as a satellite tracking-acquisition antenna, Pleumeu-Bodou, France]]
-[[Image:helical antenna principle.png|thumb|right|180px|Axial-mode helical antenna:<BR> ''(B)'' Central support,<BR>''©'' Coaxial cable feedline,<BR>''(E)'' Spacers/supports for the helix,<BR>''(R)'' Reflector ground plane,<BR>''(S)'' Helical element]]
-{{distinguish|spiral antenna}}
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-A '''helical antenna''' is an [[antenna (electronics)|antenna]] consisting of a conducting wire wound in the form of a [[helix]]. In most cases, helical antennas are mounted over a [[ground plane]]. The [[feed line]] is connected between the bottom of the helix and the ground plane.  Helical antennas can operate in one of two principal modes: normal mode or axial mode.
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-In the ''normal mode'' or ''broadside'' helix, the dimensions of the helix (the diameter and the [[pitch (screw)|pitch]]) are small compared with the [[wavelength]]. The antenna acts similarly to an [[electrically short]] [[Dipole antenna|dipole]] or [[Monopole antenna|monopole]], and the [[radiation pattern]], similar to these antennas is [[Omnidirectional antenna|omnidirectional]], with maximum radiation at right angles to the helix axis. The radiation is [[linear polarisation|linearly polarised]] parallel to the helix axis.
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-In the ''axial mode'' or ''end-fire'' helix, the dimensions of the helix are comparable to a wavelength.  The antenna functions as a [[directional antenna]] radiating a beam off the ends of the helix, along the antenna's axis.  It radiates [[Circular polarisation|circularly polarised]] radio waves.
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-Radiating at 90 degrees from the axis of the helix this design is efficient as a practical reduced-length radiator when compared with the operation of other types such as base-loaded, top-loaded or centre-loaded whips. They are typically used for applications where reduced size is a critical operational factor.
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-These simple and practical "Helicals" were primarily designed to replace very large antennas. Their reduced size is therefore most suitable for Mobile and Portable [[High-frequency]] (HF) communications in the 1&nbsp;MHz to 30&nbsp;MHz operating range.
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-[[Image:Uhf cb wit rubber ducky exposed.jpg|thumb|left|A common form of normal-mode helical antenna is the [[Rubber Ducky antenna]] used in portable radios.  The loading provided by the helix allows the antenna to be shorter than its electrical length of a quarter-wavelength.]]
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-Usually wound in a linear "spiroidal" pattern (constant parallel spaced turns) providing consistent uniform radiation as a reduced sized equivalent in respect to the standard 1/4 wave antenna. This concept was proven practical by an Australian design.{{Citation needed|date=August 2010}}
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-An effect of this type of concertinaed 'reduced size 1/4&nbsp;wave' is that the matching [[Impedance matching|impedance]] is changed from the nominal 50 ohms to between 25 to 35&nbsp;ohms base impedance. This does not seem to be adverse to operation or matching with a normal 50&nbsp;ohm [[transmission line]], provided the connecting feed is the electrical equivalent of a 1/2&nbsp;wave at the frequency of operation.
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-Another example of the type as used in mobile communications is "spaced constant turn" in which two or more different linear windings are wound on a single former and spaced so as to provide an efficient balance between [[capacitance]] and [[inductance]] for the radiating element at a particular resonant frequency.
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-Many examples of this type have been used extensively for 27&nbsp;MHz [[CB radio]] with a wide variety of designs originating in the US and Australia in the late 1960s. Multi-frequency versions with plug-in taps have become the mainstay for multi-band [[Single-sideband modulation]] (SSB) HF communications.
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-Most examples were wound with [[copper]] wire using a [[fibreglass]] rod as a former. This flexible radiator is then covered with [[heat-shrink tubing]] which provides a resilient and rugged [[waterproof]] covering for the finished mobile antenna.
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-These popular designs are still in common use today (2010) and have been universally adapted as standard FM receiving antennas for many factory produced motor vehicles as well as the existing basic style of aftermarket HF and VHF mobile helical.  The most common use for broadside helixes is in the [[Rubber Ducky antenna]] found on most portable VHF and UHF radios.
-==Axial-mode helical==
-[[Image:Hammer Ace SATCOM Antenna.jpg|thumb|End fire helical satellite communications antenna, Scott Air Force base, Illinois, USA.  Satellite communication systems often use [[Circular polarisation|circularly polarised]] radio waves, because the satellite antenna may be oriented at any angle in space without affecting the transmission, and axial mode (end fire) helical antennas are often used as the ground antenna.]]
-In the ''axial mode'', the helix dimensions are at or above the wavelength of operation. The antenna produces radio waves with [[circular polarisation]].  The [[main lobe]]s of the [[radiation pattern]] are along the axis of the helix, off both ends.  Since in a directional antenna only radiation in one direction is wanted, the other end of the helix is terminated in a flat metal sheet or screen reflector to reflect the waves forward.
-In [[radio transmission]], circular [[Polarisation (waves)|polarisation]] is often used where the relative orientation of the transmitting and receiving antennas cannot be easily controlled, such as in [[animal tracking]] and [[Satellite communications|spacecraft communications]], or where the polarisation of the signal may change, so end-fire helical antennas are frequently used for these applications.  Since large helices are difficult to build and unwieldy to steer and aim, the design is commonly employed only at higher frequencies, ranging from [[VHF]] up to [[microwave]].
-The helix in the antenna can twist in two possible directions: right-handed or left-handed, as defined by the [[right hand rule]].  In an axial-mode helical antenna the direction of twist of the helix determines the polarisation of the radio waves: a left-handed helix radiates left-circularly-polarised radio waves, a right-handed helix radiates right-circularly-polarised radio waves.   Helical antennas can receive signals with any type of linear polarisation, such as horizontal or vertical polarisation, but when receiving circularly polarised signals the handedness of the receiving antenna must be the same as the transmitting antenna; left-hand polarised antennas suffer a severe loss of [[gain]] when receiving right-circularly-polarised signals, and vice versa.
-The dimensions of the helix are determined by the [[wavelength]] λ of the radio waves used, which depends on the [[frequency]].  In axial-mode operation, the spacing between the coils should be approximately one-quarter of the wavelength (λ/4), and the diameter of the coils should be approximately the wavelength divided by pi (λ/π). The length of the coil determines how [[directional antenna|directional]] the antenna will be as well as its gain; longer antennas will be more sensitive in the direction in which they point.
-Terminal [[Electrical impedance|impedance]] in axial mode ranges between 100 and 200&nbsp;ohms. The resistive part is approximated by:
-:<math> R \simeq 140 \left ( \frac{C}{\lambda} \right )</math>
-where R is resistance in ohms, C is the circumference of the helix, and λ is the wavelength. Impedance matching to the cable C is often done by a short [[stripline]] section between the helix and the cable termination.
-[[Image:helical antenna.jpg|thumb|Helical antenna for [[wireless LAN|WLAN]] communication, working frequency app. 2.4&nbsp;GHz]]
-The maximum directive gain is approximately:
-:<math> D_o \simeq 15 N \frac{C^2 S}{\lambda^3} </math>
-where N is the number of turns and S is the spacing between turns.
-The half-power beamwidth is:
-:<math> \text{HPBW} \simeq \frac{52 \lambda^{3/2}}{C \sqrt{NS}}\, \text{degrees}</math>
-The beamwidth between nulls is:
-:<math> \text{FNBW} \simeq \frac{115 \lambda^{3/2}}{C \sqrt{NS}}\, \text{degrees}</math>
-==See also==
-*[[Telstar]]
-==References==
-*John D. Kraus and Ronald J. Marhefka, "Antennas:  For All Applications, Third Edition", 2002, McGraw-Hill Higher Education
-*Constantine Balanis, "Antenna Theory, Analysis and Design", 1982, John Wiley and Sons
-*Warren Stutzman and Gary Thiele, "Antenna Theory and Design, 2nd. Ed.", 1998, John Wiley and Sons
-==External links==
-*[http://www.antenna-theory.com/antennas/travelling/helix.php Helical Antennas] Antenna-Theory
-{{Antenna_Types}}
-{{DEFAULTSORT:Helical Antenna}}
-[[Category:Radio frequency antenna types]]
-[[Category:Helices]]

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