17 Questions
What is the main benefit of using conformal transformation techniques in analyzing strip lines?
Allows for accurate analysis of characteristics impedance with zero strip thickness
In symmetric strip lines with zero strip thickness, how are the fringing field lines distributed?
Extended up to a certain distance from the edges of the center strip
How do higher-order modes typically manifest in strip lines?
As additional solutions beyond the dominant mode
What is an advantage of using numerical techniques over conformal transformation techniques in analyzing strip lines?
Allows for simpler calculations but approximate results
What effect does increasing losses in strip lines have on the propagation characteristics?
Leads to a shift towards lower-order modes
How is excitation typically achieved in strip lines?
Via voltage applied across the center conductor and ground plates
What are the two types of losses that occur in a microstrip line?
Dielectric loss and ohmic loss
Which type of loss accounts for the finite nonzero conductivity in the strip conductor and ground plane?
Ohmic loss
In microstrip lines, where is the current usually minimum and maximum assuming a uniform distribution?
Minimum at the edges, maximum at the center
What does a quarter-wave transformer do in microstrip line applications?
Improves impedance matching
To minimize energy reflection in microstrip line connections to loads, which technique is commonly used?
Impedance matching with stubs
What must be true about the substrate thickness in relation to the free space wavelength to avoid radiation losses?
Less than the free space wavelength
What is the main advantage of using numerical techniques, such as the method of moments, to obtain the impedance of a stripline?
It provides a more accurate value of the impedance compared to analytical methods.
For a symmetric stripline with a wide center strip ($w/b >> 0.35$), what is the expression for the characteristic impedance $Z_0$?
$Z_0 = rac{rac{rac{w/b}{rac{1}{w/b}}}}{rac{w}{b}}$
What is the upper frequency limit set by the presence of the nearest higher-order TE10 and TM11 modes in a stripline?
The upper frequency limit is set by the cut-off wavelengths of both the TE10 and TM11 modes.
What is the primary source of attenuation in a low-loss dielectric stripline?
Conductor losses
How are striplines typically excited?
Using a coaxial line interface with a special launcher or connector.
This quiz covers accurate impedance calculation in symmetric striplines using numerical techniques like the method of moments. It also discusses the significance of higher-order modes in strip lines and the cut-off wavelength for TE10 and TM11 modes.
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