The main category is Antenna design calculators that is about Antenna design calculators. This link is listed in our web site directory since Sunday Mar 22and till today " Helical Antenna Design Calculator " has been followed for a total of times. So far received 12 votes for a total score of 6.
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Real Hams review new sites every day sincefor potential inclusion in the Directory, and to evaluate the best place to list them. Sign up to our Newsletter Get our latest news and links in your email. Operating Modes Operating Aids. CB Radio Antique Radio. Helical Antenna Design Calculator. Helical antennas invented by John Kraus give a circular polarized wave. They are one of the easiest to design. Related links We thought you might also be interested in these additional resources we selected from the same category: Quad calculator - Cubical quad antenna calculator in java script let you calculate eleme Share this resource Share this link with your friends, publish within popular social networks or send it via email.
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Visit Site.A Helical Antenna is formed of a helix shaped conductor wire. Normally a ground plane holds the helical antenna vertically and the antenna is technically fed like a monopole.
Helical antennas can operate in one of two principal modes: normal mode or axial mode. The following helical antenna is designed using the multi-configuration feature of HFWorks and operates at 2.
Helical Antenna Design Calculator
A helix antenna consists of more than three turns of alumina or copper wire of a constant pitch. This sort of radiation is found in television and satellite communications as it has a higher capacity to struggle against losses caused by the atmosphere. Such an antenna emitting in a circular polarization has always a 3 dB power loss factor PLF with another linear polarized antenna.
Within this HFWorks tutorial, we introduce the key features of simulating a helix antenna. To simulate the behavior of this helix antenna we are more interested in radiation patterns and antenna parameters like gain, directivity In an antenna simulation, radiation boundaries which are peculiar features of such a simulation have to be assigned to the radiation surfaces.
These surfaces truncate the air surrounding the antenna and simulate and anechoic chamber.
The helix which is the most important and special part of the antenna assembly is usually made of copper or aluminum. The conductivity of this metal imposes a certain direction to the electric field.Designing of Helical Antenna in Antenna and Wave Propagation by Engineering Funda
The latter is in this way polarized in circularly like pattern inheriting the form of the helix. The solid beneath the helix should be assigned a PEC Perfect Electric Conductor boundary condition to play the role of the ground metal. This can be automatically done realized by assigning the solid a PEC material from the material browser.
As mentioned earlier, we have to define the radiation boundaries to truncate the open air space surrounding the antenna.
The locations of these boundaries define the truncations for the air surrounding the antenna. The port definition for this antenna is located on a round surface beneath the ground metal, similarly to a connector for a coaxial cable. The helix goes through the cylinder until the port surface. The most important part of the antenna lies in the form of the helical conductor, the latter has to be meshed in a convenient rate to ensure reliable Maxwell's equations solution: The more you mesh a round shape, the more the solver realizes it is; nevertheless this shouldn't exceed a certain limit.
On the other hand the Teflon cylinder which has the wire signal going through its round cut should also be meshed in a fine rate. We obtain a mesh similar to this figure's:. Various 3D and 2D plots are available to exploit, depending on the nature of the task and on which feature the user is interested in.
As we are dealing with an antenna simulation, plotting the radiation diagram seems like an intuitive task. The following figure shows the radiation pattern of the considered antenna:.
This figure shows conformal views 2D and 3D of the variation of the power radiation pattern of the antenna in terms of the Theta angle. As mentioned within the beginning of this report, HFWorks computes Scattering Parameters within antenna studies as well; this is mostly relevant to antennas' matching optimization tasks. In this example, the antenna is best matched at 2.
The polar plots for the antenna parameters cover a wide range of parameters: radiated electric field, radiation intensity, directivity, gain pattern, axial ratio This is a vector plot of the electric field at 2.Antennas List Antenna Theory Home. Helix antennas also commonly called helical antennas have a very distinctive shape, as can be seen in the following picture. Photo of the Helix Antenna courtesy of Dr.
Lee Boyce. The most popular helical antenna helix is a travelling wave antenna in the shape of a corkscrew that produces radiation along the axis of the helix antenna. These helix antennas are referred to as axial-mode helical antennas. The benefits of this helix antenna is it has a wide bandwidth, is easily constructed, has a real input impedance, and can produce circularly polarized fields.
The basic geometry of the helix antenna shown in Figure 1. Figure 1. Geometry of Helical Antenna. The parameters of the helix antenna are defined below. D - Diameter of a turn on the helix antenna.
S - Vertical separation between turns for helical antenna. The antenna in Figure 1 is a left handed helix antenna, because if you curl your fingers on your left hand around the helix your thumb would point up also, the waves emitted from this helix antenna are Left Hand Circularly Polarized. If the helix antenna was wound the other way, it would be a right handed helical antenna. The design of helical antennas is primarily based on empirical results, and the fundamental equations will be presented here.
The helix antenna is a travelling wave antenna, which means the current travels along the antenna and the phase varies continuously. In addition, the input impedance is primarly real and can be approximated in Ohms by: The helix antenna functions well for pitch angles between 12 and 14 degrees.
Typically, the pitch angle is taken as 13 degrees.
The normalized radiation pattern for the E-field components are given by: For circular polarization, the orthogonal components of the E-field must be 90 degrees out of phase. This occurs in directions near the axis z-axis in Figure 1 of the helix. The axial ratio for helix antennas decreases as the number of loops N is added, and can be approximated by: The gain of the helix antenna can be approximated by: In the above, c is the speed of light. Note that for a given helix geometry specified in terms of C, S, Nthe gain increases with frequency.
For the same example helix antenna, the pattern is shown in Figure 2. Figure 2. Normalized radiation pattern for helical antenna dB.
The Half-Power Beamwidth for helical antennas can be approximated in degrees by: Antennas List Antenna Tutorial Home This page on helix antennas helical antennas is copyrighted. No portion can be reproduced except by permission from the author. Copyright antenna-theory.About Helical Antenna Calculator The resource is currently listed in dxzone.
The main category is Helix antennas that is about Helix antennas. This link is listed in our web site directory since Friday Jul 16and till today " Helical Antenna Calculator " has been followed for a total of times.
So far received 47 votes for a total score of 5. The scale is 1 - 10, with 1 being poor and 10 being excellent. Webmaster, add a Remote rating Related links We thought you might also be interested in these additional resources we selected from the same category: 13 cm Helix Antenna - Here is the design of a 2.
A two dollar helical hf portable antenna - Here is an easily transportable vertical antenna for 20 meters collaps Visit this link Helical Antenna Calculator Visit Site Share this resource Share this link with your friends, publish within popular social networks or send it via email. Real Hams review new sites every day sincefor potential inclusion in the Directory, and to evaluate the best place to list them.
Sign up to our Newsletter Get our latest news and links in your email. Operating Modes Operating Aids. CB Radio Antique Radio. Helical Antenna Calculator. Related links We thought you might also be interested in these additional resources we selected from the same category: 13 cm Helix Antenna - Here is the design of a 2. Share this resource Share this link with your friends, publish within popular social networks or send it via email.
The DXZone is the largest human created and maintained library of web sites dedicated to Amateur Radio, currently lists Get our latest news and links in your email. Service provided by Google FeedBurner. Visit Site.Ahh, the good old quarter wave ground plane!
This calculator can be used to design a Quarter Wave Ground Plane antenna, with radials. There are usually four radials, three being a minimum, but you could use up to six. You could cut a little on the large side and trim the antenna for best match at your desired frequency if you have the equipment.
For VHF and below, as the elements get bigger, some more structured design is needed. I have made quite a few of these antennas over the years with good results. They are very forgiving due to the low impedance feed.
Axial-Mode Helical Antenna Calculator
I use one at home on 70MHz, click here to see construction details and more images. The next two images show one I built for the 70cm band. It is good for use between MHz. It uses 6mm aluminium tube for the radials, 4mm brass tube for the driven element and is built around an N-Type chassis socket mounted to a 40x40mm aluminium square, held together with rivets. Below is some images of one I built using an SO socket riveted to a piece of aluminium sheet, with telescopic elements. Below is a quarter wave ground plane antenna I made for 23cm, MHz which is made from off-cuts of household mains copper wire and a scrap BNC socket from the junk box.
It is the simplest antenna, which provides circularly polarized waves. It is used in extra-terrestrial communications in which satellite relays etc. The above image shows a helical antenna system, which is used for satellite communications. These antennas require wider outdoor space. It consists of a helix of thick copper wire or tubing wound in the shape of a screw thread used as an antenna in conjunction with a flat metal plate called a ground plate.
One end of the helix is connected to the center conductor of the cable and the outer conductor is connected to the ground plate. The radiation of helical antenna depends on the diameter of helix, the turn spacing and the pitch angle. Pitch angle is the angle between a line tangent to the helix wire and plane normal to the helix axis. In normal mode of radiation, the radiation field is normal to the helix axis.
The radiated waves are circularly polarized. This mode of radiation is obtained if the dimensions of helix are small compared to the wavelength. The radiation pattern of this helical antenna is a combination of short dipole and loop antenna.
It depends upon the values of diameter of helix, D and its turn spacing, S. Drawbacks of this mode of operation are low radiation efficiency and narrow bandwidth. Hence, it is hardly used.
In axial mode of radiation, the radiation is in the end-fire direction along the helical axis and the waves are circularly or nearly circularly polarized. The radiation pattern is broad and directional along the axial beam producing minor lobes at oblique angles. If this antenna is designed for right-handed circularly polarized waves, then it will not receive left-handed circularly polarized waves and vice versa. This mode of operation is generated with great ease and is more practically used.
Antenna Theory - Helical Advertisements. Previous Page. Next Page. Previous Page Print Page.No other part of a wireless product is as critical. Regardless if these other parts work great, poor range and unreliable communications will ruin the products perceived value. Antennas can be created in a wonderful variety of different types, shapes and sizes to suit virtually any application. The tricky part, however, is balancing radio range, cost and the amount of available space inside the product.
Available Product Space. As shown above, antenna design trade-offs are interrelated. Changing one variable impacts the others.
Axial-Mode Helical Antenna Calculator
The above is an apples to apples comparison between a control reference antenna, a stubby external antenna and a internal ceramic chip antenna. Although the external stubby antenna was more expensive and required more labor to install, Range Testing conclusively proved its superior performance in this application. This convinced the client the cost was justified and solved his range and reliability issues.
Conversely, Range Testing in the field may prove that a small internal antenna is more than sufficient for the application. This is an example how the optimum location for the antenna became a product feature.
It can be designed into various shapes and sizes depending upon the available space on the PCB. A zero-cost solution, it can be effective for close range applications.
In addition to a small footprint, a significant feature of the Ceramic Chip Antenna is a wide bandwidth. Important with portable products, the Ceramic is less subject to de-tuning whilst hand-held or when placed upon metal objects.
They are not cheap. The Bent-Wire type is simply a stainless steel wire formed into various shapes by machine. The Helical Antenna is a elemental antenna type and is basically a shortened whip coiled as an inductor. It performs better than most PCB antennas but requires more space in the product enclosure. These can be manufactured quite economically and are frequently employed when an external antenna is not wanted. Actually a 3D structure, it stitches together the top and bottom traces creating essentially, a flattened coil.
Circularly polarized, it is compatible with both horizontally and vertically polarized antennas. An External Antenna is sometimes required for operational range or when no internal space is suitable. These can be very small and be designed to be quite inconspicuous.
Producing an almost omni-directional radiation pattern, it is frequently employed in cell phones. It requires no additional components to mate with most standard radio chips saving both cost and PCB space. These are usually only found in higher end products as the development and material cost can be expensive. Antenna Design. The design of the antenna is wicked important. Design Trade-Offs.
Large antennae may have better range but may be more expensive and require more space in the product. Small antennae may have less range but may require more power and have shorter battery life. Depending on the range required, antennae can be designed to be tiny, cheap and require little energy. Innovative Design This is an example how the optimum location for the antenna became a product feature.
Major Antenna Types. PCB Trace Antenna.