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Wave Reflection at an Impedance Discontinuity(阻抗不连续性处的反射)
2013-5-11 01:15
今日头条
537
1
- The impedance for mechanical waves is defined as the ratio between the force wave and velocity wave and in general takes the for
For transverse waves in a s ...
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Plane and Circularly Polarized EM Waves(平面圆极EM波)
2013-5-11 01:14
今日头条
435
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- Electromagnetic waves are transverse in the sense that associated electric and magnetic field vectors are both perpendicualr to the direction of wave propagatio ...
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Doppler Effects(多普勒效应)
2013-5-11 01:13
今日头条
387
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- Apparent change in the wave frequency (or in the period of periodic events) due to motion of wave source and/or observer is known as Doppler effect. In the 17th ...
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Impedance Matching Using Quarter Wavelength Medium(阻抗匹配)
2013-5-11 01:12
今日头条
427
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- Light wave falling on a glass surface suffers reflection because of impedance mismatch. If Z_g = 250 Ohms (typical), the fraction of power reflection is
^2 = ...
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Dispersive Waves(色散波)
2013-5-11 01:11
今日头条
342
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- In a nondispersive wave medium, waves can propagate without deformation Electromagnetic waves in unbounded free space are nondispersive as well as nondissipativ ...
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Antenna Directivity(天线的方向性)
2013-5-11 01:10
今日头条
454
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- Radiation profile (angular dependence of the Poynting flux = directivity) can be varied by a suitable choice of the number of antennas in an array and the phase ...
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Radiation from an Oscillating Electric Dipole(偶极子辐射)
2013-5-11 01:09
今日头条
365
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- The basic mechanism of electromagnetic radiation is discussed in Note 10. For a charge to radiate electromagentic waves in free space, it must be either acceler ...
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Pendulum Oscillation(钟摆震荡)
2013-5-11 01:08
今日头条
400
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- The differential equation to describe oscillation of a pendulum of length l is
This is a nonlinear equation. For small oscillation amplitude,
it can be lin ...
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Solitons(孤立子)
2013-5-11 01:07
今日头条
315
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- Waves are in general dispersive and the original wave form becomes dispersed as waves propagate over a large distance. However, in some waves, dispersion can be ...
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Reflection of Electromagnetic Waves(电磁波的反射)
2013-5-11 01:06
今日头条
439
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- The impedance for electromagnetic waves is defined as the ratio between the voltage and current waves,
where
are inductance and capacitance per unit len ...
