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Microwave Technique Presentation Transcript
1.TEM, TE and TM Waves
Coaxial Cable
Grounded Dielectric Slab Waveguides
Striplines and Microstrip Line
Design Formulas of Microstrip Line
Coaxial Cable
Grounded Dielectric Slab Waveguides
Striplines and Microstrip Line
Design Formulas of Microstrip Line
2.An Approximate Electrostatic Solution for Microstrip Line
The Transverse Resonance Techniques
Wave Velocities and Dispersion
The Transverse Resonance Techniques
Wave Velocities and Dispersion
3.TEM, TE and EM Waves
transmission lines and waveguides are primarily used to distribute microwave wave power from one point to another
each of these structures is characterized by a propagation constant and a characteristic impedance; if the line is lossy, attenuation is also needed
transmission lines and waveguides are primarily used to distribute microwave wave power from one point to another
each of these structures is characterized by a propagation constant and a characteristic impedance; if the line is lossy, attenuation is also needed
4.structures that have more than one conductor may support TEM waves
let us consider the a transmission line or a waveguide with its cross section being uniform along the z-direction
let us consider the a transmission line or a waveguide with its cross section being uniform along the z-direction
5.TEM, TE and EM Waves
6.why is TEM mode desirable?
sometime we deliberately want to have a cutoff frequency so that a microwave filter can be designed
sometime we deliberately want to have a cutoff frequency so that a microwave filter can be designed
7.TEM Mode in Coaxial Line
the inner conductor is at a potential of Vo volts and the outer conductor is at zero volts
8.TEM Mode in Coaxial Line
the inner conductor is at a potential of Vo volts and the outer conductor is at zero volts
8.TEM Mode in Coaxial Line
9.TEM Mode in Coaxial Line
higher-order modes exist in coaxial line but is usually suppressed
the dimension of the coaxial line is controlled so that these higher-order modes are cutoff
the dominate higher-order mode is mode, the cutoff wavenumber can only be obtained by solving a transcendental equation, the approximation is often used in practice
higher-order modes exist in coaxial line but is usually suppressed
the dimension of the coaxial line is controlled so that these higher-order modes are cutoff
the dominate higher-order mode is mode, the cutoff wavenumber can only be obtained by solving a transcendental equation, the approximation is often used in practice
10.Surface Waves on a Grounded Dielectric Slab
a grounded dielectric slab will generate surface waves when excited
this surface wave can propagate a long distance along the air-dielectric interface
it decays exponentially in the air region when move away from the air-dielectric interface
a grounded dielectric slab will generate surface waves when excited
this surface wave can propagate a long distance along the air-dielectric interface
it decays exponentially in the air region when move away from the air-dielectric interface
11.Striplines and Microstrip Lines
since the stripline has only 1 dielectric, it supports TEM wave, however, it is difficult to integrate with other discrete elements and excitations
microstrip line is one of the most popular types of planar transmission line, it can be fabricated by photolithographic techniques and is easily integrated with other circuit elements
since the stripline has only 1 dielectric, it supports TEM wave, however, it is difficult to integrate with other discrete elements and excitations
microstrip line is one of the most popular types of planar transmission line, it can be fabricated by photolithographic techniques and is easily integrated with other circuit elements
12.Striplines and Microstrip Lines
13.Striplines and Microstrip Lines
a microstrip line suspended in air can support TEM wave
a microstrip line printed on a grounded slab does not support TEM wave
the exact fields constitute a hybrid TM-TE wave
when the dielectric slab become very thin (electrically), most of the electric fields are trapped under the microstrip line and the fields are essentially the same as those of the static case, the fields are quasi-static
a microstrip line suspended in air can support TEM wave
a microstrip line printed on a grounded slab does not support TEM wave
the exact fields constitute a hybrid TM-TE wave
when the dielectric slab become very thin (electrically), most of the electric fields are trapped under the microstrip line and the fields are essentially the same as those of the static case, the fields are quasi-static
14.Design Formulas of Microstrip Lines
design formulas have been derived for microstrip lines
these formulas yield approximate values which are accurate enough for most applications
they are obtained from analytical expressions for similar structures that are solvable exactly and are modified accordingly
design formulas have been derived for microstrip lines
these formulas yield approximate values which are accurate enough for most applications
they are obtained from analytical expressions for similar structures that are solvable exactly and are modified accordingly
15.Design Formulas of Microstrip Lines
16.Design Formulas of Microstrip Lines
17.Design Formulas of Microstrip Linesnote that for most microstrip substrate, the dielectric loss is much more significant than the conductor loss
at very high frequency, conductor loss becomes significant
at very high frequency, conductor loss becomes significant
18.An Approximate Electrostatic Solution for Microstrip Lines
19.An Approximate Electrostatic Solution for Microstrip Lines
20.The Transverse Resonance Techniques
21.Wave Velocities and Dispersion
22.consider a grounded slab and its equivalent transmission line model
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