One can simply understand the function and directivity of an antenna by having a look at its radiation pattern. The radiation fields of the discone antenna with an oblique cone can be derived from the fields of an equivalent huygens source on the aperture. Citeseerx optimization of a broadband discone antenna. Many cards are accompanied with nifty software that displays db measurements for things like. Three source files plain text can be loaded and plotted at the same time. Discone antennas are wide bandwidth and omnidirectional radiation.
The antenna consists of a circular disc and a cone whose apex approaches the centre of the disc. This paper presents parameters of two types of antennas discone and microstrip patch obtained. The discone antenna is able to provide a bandwidth of around 10. Noaa satellites and qfh antennas have righthand circular polarization.
The idea for the parabolic discone antenna came to me because dish antennas are best understood using the ray principle, like light. Prototyping of uhf antennas using simulation software. In any illustration, the sketch drawn to represent the radiation of an antenna is its radiation pattern. With an indoor vertical polarized antenna, you will get very marginal reception. An adsb antenna built from actual garbage hackaday. The antenna exhibits a dipolelike radiation pattern, i. Solved software for viewing 3d antenna radiation pattern. Sep 16, 2012 a discone antenna is a form of biconical antenna with spoke radiating both outward and downward in a circular pattern. Coax dipole calculator an efficient program to calculate dimensions of coax dipoles. The radiation pattern of these antennas will be same as that of short horizontal dipole antenna.
Optimization of a broadband discone antenna design and platform. The radiation pattern in the vertical plane is quite narrow, making its sensitivity highest in the direction of the horizon and rather less for signals. The other antenna was made by antenna specialist who are still in business and may still produce the super scanner. If you look at commercial or military versions tested on antenna ranges the test specs speak for themselves. For a symmetrical discone antenna, the numerical and experimental radiation patterns are presented. The performance of discone antenna as function of frequency is very much similar to high pass. You can use it to receive and transmit a wide range of signals, including amateur radio, aircraft and other special services, on your scanner or other receiver. Use the antenna designer app to plot the radiation pattern of a patch microstrip antenna with a dielectric substrate. A circularly polarized antenna for 7 mhz, which supports rhcp, all us satellites are rhcp. Grad220r 1444409001200mhz 2m70cm33cm25cm mini discone multiband wideband mobile scanner antenna, 29. When such a small loop antenna is mounted on top of a portable receiver, whose output is connected to a meter, it becomes a great direction finder.
To measure the radiation pattern of our antenna we set up a test range in the. The discone antenna is used for all type of radio scanning and monitoring applications from the commercial or military monitoring services to the home scanner enthusiasts for frequencies typically above 30 mhz. But with a disk stuck to the top of a cone, the antennas have been a little hard to. The gain pattern of the disccone antenna doesnt depend on the feed pin radius. The antenna is composed of a disc shaped radiator on top of a cone shaped ground plane. The radiation pattern of qfh antennas is very broad and toward the sky. Omnidirectional, vertically polarized and with gain similar to a dipole, it is.
Necwin pro antenna analysis software with the user in mind. An antenna constructed from separate elements is lighter and more cost effective to construct. Pattern and impedance characteristics of an antenna with the di. Iirc, the difference in polarization alone accounts for a 3db gain. This mostly 3dprinted discone antenna is ready for broadband.
A broom handle,some 14 dowels and under 10 feet of wire will make a 2 meter antenna. A prototype skeleton discone antenna for 2nd and 3rd. Hello there, discone antennas have gain less than 0dbd, closer to 0dbi 2. Looking at antenna design like it was optics can inspire new ideas. Rustfree stainless steel is employed in major component parts making the antennas rust resistant and very durable find diamond antenna dj super discone antennas dj and get free standard.
Design and results of the fabricated discone antenna. When employed as a transmitting antenna, it is often less efficient than an antenna designed. Citeseerx document details isaac councill, lee giles, pradeep teregowda. This example shows how to design and implement a discone antenna for indoor use in. The discone antenna is constructed by using cone and disk. Radiation is the term used to represent the emission or reception of wave front at the antenna, specifying its strength. Gain of the antenna varies in proportion with gap between cone and disc. Sometimes these cones are made out of a solid metal conductor which can be heavy and costly. Antenna descriptions and pattern plots are easily saved and recalled for future analysis. While you could obviously guess from looking at the antenna that the bicones radiation pattern is updown. Accordingly the radiation patterns the antenna can be viewed as either transmitting or receiving, whichever is more convenient. The radiation pattern in the vertical plane is quite narrow, making its.
An interesting application note about wlan discones 2. Jun 19, 2017 if you look at commercial or military versions tested on antenna ranges the test specs speak for themselves. Discone antennas are wide bandwidth and omnidirectional radiation antennas that are widely used in vhf and uhf broadcasting systems. This fast and reliable software allows obtaining the radiation characteristics of a variety of horn antennas, including. Sep 28, 2015 any antenna s radiation pattern is typically measured using an approximation of free space, that is, no near objects. This antenna beams into three quadrants without the use of a rotator. See the pattern and antenna currents on the same color 3d display as the antenna. The discones wideband coverage makes it attractive in commercial, military, amateur radio and radio scanner applications.
Traditional design guidelines for broadband antennas do not always produce satisfactory performance for the desired frequency range of interest. So if you design antenna for 100mhz it will work well allthe way to 800mhz. Enhanced machine controllerbased antenna range emcar emcar employs linuxcnc based machine control coupled with open source software to implement a measurement system for antenna radiation pattern data i. The discone is most seen as a receive antenna but is underrated. The antenna is omnidirectional i n hor izontal plane fo r rfi mon itoring w ith uniform radiation pattern over the designed frequency band. The coax jumpers made the other 2 unactive elements. Apr 07, 2014 download antenna radiation diagram plotter for free. Source code and windows executables are available to download. Discone vs a jpole scanner antenna kb9vbr jpole antennas. The radiation pattern in the vertical plane is quite narrow, making its sensitivity highest in the plane parallel to the earth. For an asymmetrical discone antenna with an oblique cone, the radiation patterns are also presented.
Diamond antenna dj super discone antennas are ultrawideband antennas covering amateur radio, commercial 2way, cellular, air traffic control and various utility frequency bands. The radiation pattern polar diagram for a half wave dipole antenna shows that the direction of maximum radiation or sensitivity is at right angles to the axis of the rf antenna. In the second phase, savant is used to compute the installed antenna pattern of the discone antenna from the current source representation. D3000n super discone antenna the d3000n super discone antenna is an ultrawideband antenna covering amateur radio, commercial 2way, cellular, air traffic control and various utility frequency bands. A discone antenna is an omnidirectional vertically polarized antenna. Rustfree stainless steel is employed in major component parts making the antenna rust resistant and durable. Online calculator dimensions of a discone antenna changpuak. There is a slight variation observed with the change in gap between cone and disc. Can be interfaced to hfwin32 propagation prediction software. Antenna maker antenna design program for quads, yagis, inverted vees, jpoles, trap dipoles and more. In order to provide a dynamic response, reconfigurable antennas integrate an inner mechanism such as rf switches, varactors, mechanical actuators or tunable materials that enable the intentional redistribution of the rf currents over the.
In the antenna gallery section, under patch family, click microstrip. The antenna is vertically polarized and extremely widebanded meaning it will receive, and transmit, on a wide range of frequencies. Measure and display the radiation pattern of a beam antenna, g4hfq, 1738. It is usually mounted vertically, with the disc at the top and the cone beneath. Multiple patterns can be superimposed on a single graph for comparison. Moderate uncertainties in amplitude and phase patterns of a designed uhf radial discone antenna.
By using relays, a single feed line could be switched to 1 of 3 elements or to all for an omni position. The discone object creates a discone antenna that consists of a circular disc and a cone whose. Rustfree stainless steel is employed in major component parts making the antennas rust resistant and very durable find diamond antenna dj super discone antennas dj and get free standard shipping on orders. Impedance and radiation pattern of custom discone antenna. Four candidate locations for the installation of the antenna on the lower fuselage of the a320. The two elements can be either solid or composed of separate elements.
Any antenna s radiation pattern is typically measured using an approximation of free space, that is, no near objects. A reconfigurable antenna is an antenna capable of modifying its frequency and radiation properties dynamically, in a controlled and reversible manner. Two years later, in 1943, armig kandoian at the federal telephone and radio corporation applied for a patent on the discone antenna. There is very little gain or pattern difference between the 3 and 4 sided versions. So, anything you can do with light you can do with radio waves in theory. The length of the cone side and its radiation pattern gain are inversely related. Any antennas radiation pattern is typically measured using an approximation of free space, that is, no near objects. This discone scanner and ham base station antenna is our most efficient omnidirectional antenna system, combining a disc antenna with electrically matched radiators. Omnidirectional, vertically polarized and with gain similar to a dipole, it is exceptionally wideband, offering a frequency range ratio of up to approximately 10. Antenna design software, such as wipld, addresses the difficulties of designing. Knowing the discones radiation pattern, a simple rig was constructed to mount the discone upsidedown. The small loop antenna is generally a linearly polarized one.
Antenna design calculators category is a curation of 83 web resources on, parallel square conductor transmission line calculator, analysis of antenna mast strength and bending stress, full wave loop antenna calculator. This antenna was theoretically analysed and software simulated with the. The performance of discone antenna as function of frequency is very much similar to. Slider, software development, software hacks, solar hacks, space. The discone antenna or discone aerial is often used where. The discone antenna is best suited for a situation where a true. The d190 diamond discone antenna, frequency 1001500mhz type discone impedance 50 ohms length 0. A discone antenna is a form of biconical antenna with spoke radiating both outward and downward in a circular pattern.
In addition, the accurate prediction of the freespace antenna performance is not sufficient to determine if the antenna will meet a larger. This antenna has an exceptionally large coverage, offering a frequency range ratio of up to 10. Antenna, ve3sqb ham radio antenna design software programs. The frequency range that a discone covers is dependent on the length of the individual spokes. Rustfree stainless steel is employed in major component parts making the. Asap antenna scatterers analysis program, is a free general purpose antenna analysis software program for numerical electromagnetic antenna design, modeling and analysis. Moderate uncertainties in amplitude and phase patterns of.
Download antenna radiation diagram plotter for free. This antenna was theoretically analysed and software simulated with the purpose of computationally design. Generally, discone antenna is less sensitive in terms of pattern and impedance with respect to frequency variation. Discone antenna design discone antenna deisgn program by. Horn antenna calculator is a software tool for the simulation of the radiation pattern of horn antennas. In order to provide a dynamic response, reconfigurable antennas integrate an inner mechanism such as rf switches, varactors, mechanical actuators or tunable materials that enable the intentional redistribution of the rf. The discone object creates a discone antenna that consists of a circular disc and a cone whose apex approaches the center of the disc.
On the antenna properties tab, change the groundplane length and groundplane width to 0. The discone s wideband coverage makes it attractive in commercial, military, amateur radio and radio scanner applications. Optimization of a broadband discone antenna design and. Even if measured on an antenna range, the pattern is essentially theoretical. Unix application developped at the university of texas department of the computer sciences, permit to display the radiation pattern and the current magnitude. It can cover multiple bands and has more gain than verticals. The antenna radiation pattern is similar to that of a regular dipole and the only real difference is the a llowable bandwidth of this antenna is considerably higher than the dipole and can commonly achieve bandwidths of four to one. When installed, every object near the antenna walls, ceilings, wires, bodies, and reflections from all those objects will change the pattern. The antenna is an ultrawideband antenna covering amateur radio, commercial 2way, public safety, air traffic control and various utility frequency bands. Sirio antenna sd2000n 100 mhz2 ghz discone wide band antenna. Antenna radiation diagram plotter polar plots of measured em emission, with a proper radial axis scaling and span. The problem for many people is about half way through its bw the radiation pattern starts to point upward and you loose gain at the horizon even though the discone is still meeting spec on gain. Taurus d scannerhamgeneral coverage discone antenna, 250 mhz.
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