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What is Radiation pattern of have wave dipole is?
In open space, infinitely far from material objects, the radiation pattern of a half-wave dipole is a torus (donut), with the radiator (wire) passing straight through the center of the hole. The field strength is maximum in all directions perpendicular to the wire, and zero in the directions off the ends of the wire. The peak field strength is +2.2 dB relative to isotropic.
What is the difference between an aerial and an antenna?
i think.... and i only think this, it may not be correct, an antenna transmits as well as receives, an aerial only receives there is no difference between antenna and aerial. According to British spelling it is called Aerial and according to American English antenna. So there is no difference just the English In the U.S. sometimes antenna is used for rigid structures used to transmit or receive radio signals, while aerial is used for a simple wire hung between insulators used to transmit or receive radio signals.
What are the advantages and disadvantages of cliff regarding?
Advantages are that it is long lasting, stops the wave energy, and is cheap. Disadvantages are that it is not very sturdy and can harm the environment.
What happens to the speed of the waves if the frequency of the wave source is halved?
The wavelength of a wave would double if the frequency was cut in half. Wavelength=c/frequency where c equals the speed of light.
Why do polar molecules absorb IR?
You can view incident IR radiation as an oscillating electric field ( the 'wave-like' view of EM radiation.) As such, it effects the vibration of a molecule by inducing a dipole oscillation of the same frequency. The connection is most clearly seen if you consider that the induced dipole oscillation produces an identical oscillating electric field to the field that induced it. A molecule can only produce an oscillating electric field by vibration if its vibration produces a change in dipole moment (a non-polar molecule would produce a constant electric field regardless of the vibration.) I hope that helps
What is the half wave dipole?
effective height of half wave dipole antenna
What is the operational frequency of half wave dipole antenna?
Its resonant frequency is where its length is half a wavelength, so for 100 MHz the wavelength is 3 metres and a 1.5-metre long dipole is resonant. A dipole antenna can be used for many applications within a band of 10-20% around the resonant frequency.
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.
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 the bandwidth of half dipole antenna?
The polar pattern for a half lambda aerial is a toroidal (doughnut) shape with the aerial in the centre of the toroid when mounted in free space a half wave above the ground. The half wave is an omni-directional aerial and produces zero gain.
Find the optimum wavelength and frequency for a half-wave dipole of length 10 m?
15mhz
What is the formula for a quarter wave dipole antenna?
The length of a quarter wave for constructing one end of a dipole is: 234/MHz = feet of wire. For instance if you have an 80 meter ham radio transceiver and want to construct a dipole to match a frequency of 3.56 MHz (the low power calling frequency) then 234/3.56 = 65.7 feet Next buy a spool of speaker wire, mark off 65 and 3/4 feet, and pull apart the two wires until you reach the mark. Now you have a half wavelength dipole that resonates near 3.56 MHz. Start broadcasting in Morse code and I will meet you on the air! Sandy, KB3EOF
What is the perfect length of antenna for a radio signal of 100 MHz?
The half-wave, center-fed 'dipole' antenna is probably the antenna that's simplest to design, and easiest to build and operate. For 100 MHz, it's a single wire, supported at its ends and insulated from the supports, hung horizontally, opened and connected to a 75-ohm coaxial cable at its center, with an overall length of 4 feet 11 inches (1.5 meters).
What are the disadvantages of half wave recrifier?
A half wave rectifier does not make a stable voltage. A single phase half wave creates a "bumpy road" where voltage modulates between sine wave maximum and zero. A three phase half wave will create a more stable, but ultimately "unclean", voltage.
End fire antenna?
end-fire antenna = surface-wave antenna
What are the disadvantages of full-wave transformoer over half-wave transformaer?
well the transformer is always full wave half wave refers to the one diode on the output for dc other than spending less for diodes there are no disadvantages to full wave diodes are a LOT cheaper than capacitors if you need clean dc if youre buying wall warts get the full wave if it costs the same
What length of dipole in relation to its wavelength in meters or khz?
There are several kinds of dipole; the most common is the half-wave dipole. Its total length is fairly close to half the wavelength of the design frequency. The length needs to be adjusted slightly to compensate for the thickness of the elements and for end-effects. If the length is wrong by ten or twenty percent it will alter the feed impedance, but have little effect on the gain.
