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What is the difference between monopole antenna and dipole antenna?
Wiki User
∙ 12y ago
Monopole is an antenna with just the radiating element where the ground of the transmitter is connected to an electrical ground which serves as an Image ground to the radiating element. Thus the name "mono" pole.
Dipole is where the ground and the radiating elements are connected to two different elements where one is the radiating element and the other is the ground to the later. Thus the name "Di" Pole
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by zafran khan
Wiki User
∙ 12y ago
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How does yagi-uda antenna differ from a folded dipole a loop antenna and a helical antenna?
Wow, your question on how a yagi-uda differs from a folded dipole, a loop antenna, and a helical antenna relates very much to how does a lawn mower engine relate to a V-8. The principals in all the antennas remains much the same. So I will deal with them in the order asked. The Yagi in its simplest form consists of 3 elements. The center element is the driven element and is essentially a dipole. Behind it is a slightly larger element called a reflector which does just that, it reflects signals to and from the dipole and in front there is the smaller director which helps focus energy. This is a directional antenna with gain. The folded dipole goes back to the basic dipole except it has makes a full loop. They are just as about as long as regular dipoles. With the loop of wire out there, they tend to have a wider band width than regular dipoles - but are not as tolerant of being used at even multiples of their cut frequency as the wires tend to cancel out each other. Oh, btw, yagi's have been made using folded dipoles. You must use ladder line or a 4:1 balun on folded dipoles, with perhaps the exception of the terminated folded dipole which has a resistor where the two elements of the dipole come together. The loop antenna? Which loop? I assume you are talking the traditional loop and not the magnetic loop. The full loop is normally computed to be 1005/frequency=feet. While you could take the time to tune the antenna, it might just be easier to put in a balun and an antenna tuner. The main advantage of a loop over the previous reviewed antennas is that it does fairly well even though fairly close to the ground where the previous 2 antennas should be at least 1/2 a wave length up for good performance. Helical antennas are generally good for just one band. In fact, due to the loading they cause they are best if used on a single frequency as their feed line requires them to be provided the connecting feed the is the electrical equivalent of a 1/2 wave at that frequency of operation. This may work well at VHF and above as an entire band can be tuned satisfactory, but in HF it would limit you to a very small segment of the band. Helical antennas definitely are the lawn mower engines of the antenna world. Look up antenna elmer on your favorite search engine. You have entered into a world where there is still a lot homework left to be done.
Applications of electric dipole materials in the field of electronics?
uses of dipole materials
What is the difference between Dbi and Dbm?
There are a few terms that need to be understood. [dBm,dBd,dBi and dB] For antennas, a common reference unit is the dBi, which states the gain of an antenna as referenced to an ISOTROPIC source. An Isotropic source is the perfect omnidirectional radiator, a true "Point Source", and does not exist in nature. Consider it a source which is the center of the sphere and the energy is coming equally out of it as a sphere. Now in reality nothing like that exists. It's also 2.41 dB BIGGER than the next common unit of antenna gain, the dBd, When you convert that to a real antenna. So a simple dipole antenna has a gain of 2.41dBi, and a gain of 0dBd, since we're comparing it to itself. Now lets talk about dBm, dBm is not is reference to anything else but the used as an actual gain ( say amplifiers ) , P(dBm)=10*LOG(1000*Power in milliwatts,10), an amp with an output of 30dBm puts out 1 Watt. It is not in refernce to two power level but directly correlating the gain of a device. Now when you talk about a dB it is a relative measure of two different power levels. 10log (p1/p2, 10).
What is the similarity between ice and water?
I will laugh if this is someone from Oriana's Chemistry class. If you are, put into your own words please ^ ^ Um. From what I have been able to figure out, the primary forces of attraction between both water and alcohol molecules is the hydrogen bond, which is largely responsible in each for the high boiling point. Each have London dipole-dipole reactions that are also involved. Despite, or perhaps because of, their similarities, alcohol and water don't mix well, because they tend to form a really complicated hydrogen "network".
How do you increase the range of a Wifi transmitter?
You can buy range extenders that work with the wireless router. Bestbuy has some belkin, d-link, netgear and some linksys ones. What I meant was something free. I've heard things like putting a pringles can over the antenna will increase the range. Is that true? If not, are there other things like that that would work? I have tried using cans as improvised "cantennas" over my wireless router's dipole antennas. The signal results were worse than without the cans. A cantenna must be built to the correct dimensions to provide any signal gain, and it replaces the entire antenna. An almost-free solution is to build a parabolic reflector for each of your transmitter's antennas, directing the signal only where it's needed. See http://www.freeantennas.com/projects/template/ The only materials needed are glue, tape, aluminum foil, and light cardstock (a file folder will do). Since the cardstock is "invisible" to your wifi devices, you can tape the left & right edges of the foil to the outside (convex side) of the reflector. When the reflector is bent into a parabola, having the foil on the outside will pull the foil smooth rather than crumpling it. Here's one I designed for specific antennas: http://24.106.181.178/geocorona/index.html A true parabola with the antenna in the correct focal point will precisely direct the radio signals from your wireless device (eg, laptop) to the antenna, and vice versa. A simple reflector such as a can or arbitrarily shaped foil will sometimes cause more interference than signal gain. For those with a Linux-based Linksys router, third-party firmware is available that will allow a capable Linux user to electronically boost the signal strength of the router, but this will not increase the router's ability to receive signals from the client devices it serves. A bi-directional amplifier for the 2.4 GHz frequencies is required to get a signal boost both ways. These amplifiers usually cost as much as the wireless router they boost.
How loop antenna and dipole antenna can be used interchangeably?
A full-wave loop antenna can be interchanged with a folded dipole without much difference. The input impedance is similar and the only difference is in the directivity: a full wave loop radiates along the axis of the loop, while a vertical folded dipole is omnidirectional.
Is folded antenna nothing but the conical antenna?
A folded antenna is a dipole type.
What is the difference between yagi antenna and dipole antenna?
I don't think it has. Bandwidth depends on the diameter to length ratio of the antenna. The greater the diameter of the elements the wider the bandwidth. The inductance goes down and the capacitance goes up, giving the antenna a lower Q. the folded dipole has a greater effective diameter (at least double for the same materials). You can increase a normal dipole's bandwidth by increasing the diameter, hence the old time birdcage aerials.
Does ch4 have dipole-dipole interactions?
No it doesn't; as there is practically no difference in electronegativity between carbon and hydrogen to create a dipole.
What is the half wave dipole?
effective height of half wave dipole antenna
Can you make a comparison between the dipole antenna and short dipole antenna?
A short dipole has lon the other hand, A half-wave dipole doesn't strictly satisfy our criterion l for being "short.Eng: Ibrahim Mawdhah, yemenمهندس : ابراهيم معوضه
What is difference between between electric dipole moment and magnetic dipole moment?
Magnetic dipole is due to two poles of magnet. Electric dipole is due to +ve and -ve charges of electric charges.
Why dipole antenna not used for high frequency?
Depends on what you mean by high frequency. The rabbit ears antenna used in broadcast TV is a dipole and is used for VHF.
The type of antenna used for the television broadcasting?
Dipole
Claculate the length of the dipole antenna at 450 MHz?
245
What is the difference between polarized and non polarized?
the existence of a dipole moment.
What are the advantage of trap dipole antenna?
A dipole antenna, is a radio antenna that can be made of a simple wire, with a center-fed driven element. It consists of two metal conductors of rod or wire, oriented parallel and collinear with each other (in line with each other), with a small space between them. The radio frequency voltage is applied to the antenna at the center, between the two conductors. These antennas are the simplest practical antennas from a theoretical point of view. They are used alone as antennas, notably in traditional "rabbit ears" television antennas, and as the driven element in many other types of antennas, such as the Yagi. Dipole antennas were invented by German physicist Heinrich Hertz around 1886 in his pioneering experiments with radio waves.
