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377 ohms OR 120pie
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∙ 15y ago
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Effects caused by opening angle of a pyramidal horn antenna?
The opening angle of a pyramidal horn antenna is to match the impedance of the horn antenna to that of free space. With this enlargement of the dimension, the velocity of the wave travelling will decrease. This will increase the guide wavelength, which in turn increases the impedance of the horn. This gives an impedance value closer to that of free space there by giving better power transfer.
Which is better high input impedance or low input impedance and why?
That depends on the output impedance. In electronic we use voltage bridging, that is a relative low output impedance to a higher input impedance. Usualy the input impedance is more than ten times higher then the output impedance. An input impedance is called also a load impedance or an external impedance. An output impedance is called also a source impedance or an internal impedance.
What happens to the number of free electrons and holes in an intrinsic semiconductor when the temperature decreases?
increases
How to distinguish between characteristic impedance and input impedance?
The characteristic impedance or surge impedance belongs to uniform transmission lines.In electronic gears we use voltage bridging, that is a relative low output impedance to a higher input impedance. Usualy the input impedance is more than ten times higher then the output impedance.An input impedance is called also a load impedance or an external impedance.An output impedance is called also a source impedance or an internal impedance.
Input impedance is greater than to load impedance?
In electronic gears we use voltage bridging, that is a relative low output impedance to a higher input impedance. Usualy the input impedance is more than ten times higher then the output impedance.An input impedance is called also a load impedance or an external impedance.An output impedance is called also a source impedance or an internal impedance.
What is Intrinsic Impedance?
intrinsic impedance is ratio of E/H from a uniform plane ve in a materal
What is the difference between characteristic impedance and intrinsic impedance?
I believe intrinsic impedance is more tied to the medium, thus is defined in terms of magnetic and electric permeability and electrical conductivity, while characteristic impedance is a "wider" look at the impedance. For example, you can calculate the intrinsic impedance of a 18 awg copper wire, or air, or a vacuum. If you wanted to use coax cable with an 18 awg core, you would be looking at the characteristic impedance, not the intrinsic impedance of the copper that will be carrying the waveform.
What is the electrical impedance of air?
Electical impedance of air is just under 377 Ohms. It depends on humidity and other factors. Dry air is close to free space. Scroll down to related links and look at "Characteristic impedance of free space ".
Effects caused by opening angle of a pyramidal horn antenna?
The opening angle of a pyramidal horn antenna is to match the impedance of the horn antenna to that of free space. With this enlargement of the dimension, the velocity of the wave travelling will decrease. This will increase the guide wavelength, which in turn increases the impedance of the horn. This gives an impedance value closer to that of free space there by giving better power transfer.
How does light travel through emty space?
Light travels through the "free Space Impedance z= 375 Ohms. Maxwell called this the Ether.
C Calculate the power flux density in free space when the transmitter gain Gt is 25 if the effective Isotropic radiated power of the transmitter is 300kw and the intrinsic impedance of the transmitter?
Power Flux density is a function of distance from the transmitter so: PFD(r) = 300kW*25/(4*PI*r^2) when r is in meters the value is in kw/m^2
Why are the romanians intrinsic motivation to work for Nokia?
there intrinsic motivation came the factory supplying a caferteria with free food , gym, playing fields and sauna.
Is a volume is extrinsic?
Volume can be intrinsic or extrinsic, depending on the context. Intrinsic volume refers to the amount of space occupied by an object or substance itself, while extrinsic volume includes the space occupied by the object or substance together with any surrounding or enclosing space. For example, the intrinsic volume of a solid object would be the amount of space it occupies, while the extrinsic volume would include the space it occupies along with any air or other material surrounding it.
What is wave impedance of free space?
The current value is 376.73 Ohms. For practical purposes, 120 x pi suffices. There are separate values for the electrical and the magnetic components. If the Ampere is redefined in 2015, this value will change.
What are the examples of valid constants?
The speed of light c,"free space impedance z, Planck's Constant h and Newton's Gravity Constant G. Planck's Constant h and the free space impedance z are related, by two electromagnetic constants, W and C. h = WC and z= W/C. W = 500E-18 Webers (volt second) and C= 4/3 E-18 Coulombs. h=zC2. The Photon has charge C and is represented as quark (13U,1d).
Which is better high input impedance or low input impedance and why?
That depends on the output impedance. In electronic we use voltage bridging, that is a relative low output impedance to a higher input impedance. Usualy the input impedance is more than ten times higher then the output impedance. An input impedance is called also a load impedance or an external impedance. An output impedance is called also a source impedance or an internal impedance.
What happens to the number of free electrons and holes in an intrinsic semiconductor when the temperature decreases?
increases
