0
4*73=292
dattatreya
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∙ 12y ago
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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 kind of force is a dipole dipole of force?
Dipole-dipole interactions are of electrostatic nature.
Is ICL dipole dipole?
yes
What is a dipole dipole bond?
The bond dipole moment measure the polarity of a chemical bond.
What are three types of physical properties that are important for paint?
color, density, resistance to UV radiation
What is the value of radiation resistance of half wavelength dipole antenna?
36 ohm
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.
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.
Why was before used the 300 ohm transmission line?
The impedance of a centre fed dipole at resonance is about 73 ohms. The feed impedance of a folded dipole is four times that, 292 ohms. The feedpoint is of course balanced in both cases, thus 300 ohm balanced line is an excellent match for the folded dipole active element of a commercial TV antenna.
Thr radiation pattern in plane perpendicular to Hertizian dipole is.?
It's a torus.
What are the advantage of Yagi-uda array?
The Yagi array allows a significant increase in antenna gain (expressed in dBi or Db over isotropic) by the simple addition of parasitic elements to a dipole or folded dipole.
Radiation resistance of quarter wave monopole antenna is?
The radiation resistance of quarter wave monopole is 36.5 ohms
What is a active gas?
Absorption of energy from IR radiation can only occur when the wavelength of radiation and the wavelength of the bond vibration match. If a molecule has symmetry...for example no dipole, we say it is IR inactive. CO2 has no dipole....this would be an IR inactive gas...Cl2 as well. A gas that has a dipole would be IR active. Propene would be a nice example of an IR active gas.It possesses a dipole. One would see a signal around 1650.A:CO2 has no permanent dipole. However, when CO2 undergoes a bending vibration, its dipole moment changes from zero to some non-zero value. This vibration produces a change in dipole moment and is therefore IR active.
What is a infrared active gas?
Absorption of energy from IR radiation can only occur when the wavelength of radiation and the wavelength of the bond vibration match. If a molecule has symmetry...for example no dipole, we say it is IR inactive. CO2 has no dipole....this would be an IR inactive gas...Cl2 as well. A gas that has a dipole would be IR active. Propene would be a nice example of an IR active gas.It possesses a dipole. One would see a signal around 1650.A:CO2 has no permanent dipole. However, when CO2 undergoes a bending vibration, its dipole moment changes from zero to some non-zero value. This vibration produces a change in dipole moment and is therefore IR active.
The most appropriate value of the radiation resistance of a quarter wave monopole antenna?
The radiation resistance of a quarter wave monopole over a ground plane is 36.5 ohms.
What physical properties must the material have for banknote?
- resistance to UV radiation- resistance to wear and tear- if possible some resistance to water
