課程大綱. Introduction of Electromagnetic Theory (1) Transmission Line Theory (2) Transmission Line (3, 10.5) Microwave Network Analysis (4) Impedance Matching and Tuning (5) Microwave resonators (6) ps. 括弧中之數字代表所對應教科書之章節. 教學目標.
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(Audio, Video, Data)
(Audio, Video, Data)
Microwave & Millimeter Wave
20 or 55
GHz , below 10 GHz
IEEE Standard C95.1-1991 recommended power density limits for human exposure to RF and microwave electromagnetic fields
Planar Transmission Lines and Waveguides
Conventional Transmission Lines and Waveguides
Good for Microwave Integrated Circuit (MIC) Applications
Good for Long Distance Communication
ps. The names underlined were Nobel Prize winners.
When steady-state condition is considered, phasor representations of Maxwell’s equations can be written as : (time dependence by multiply e -jt )
Q : total charge contained in closed surface S.
I : total electric current flow through surface S.
(e.g. Crystal structure and ionized gases)
where 0 = 8.85410-12 farad/m is the permittivity of free space.
μ0 = 410-7 Henry/m is the permeability of free space.
Question:2(6) equations are not enough to solve 4(12) unknown
where Pe is electric polarization, Pm is magnetic polarization,
e is electric susceptibility, and m is magnetic susceptibility.
ω’’ is loss due to dielectric damping,
(ω’’ + ) can be seen as the total effective conductivity,
is loss angle.
Example1.1 : In a source-free region, the electric field intensity is given as follow. Find the signal frequency?
is defined the wavenumber, or propagation constant
, of the medium; its unit are 1/m.
is wave impedance, intrinsic impedance of medium.
In free space, 0=377.
is phase velocity, defined as a fixed phase point on the wave travels.
In free space, vp=c=2.998108 m/s.
is wavelength, defined as the distance between two successive maximum (or minima) on the wave.
In wave equations, jk for following conditions.
Condition: (1) >>ω or (2) ’’>>’
is skin depth or penetration depth, defined as the amplitude of fields in the conductor decay by an amount 1/e or 36.8%, after traveling a distance of one skin depth.