Impedance Calculation in Symmetric Striplines

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What is the main benefit of using conformal transformation techniques in analyzing strip lines?

Facilitates the calculation of losses in strip lines

Enables the study of fringing fields at the edges of the center strip

Allows for accurate analysis of characteristics impedance with zero strip thickness (correct)

Simplifies the calculations for higher-order modes

In symmetric strip lines with zero strip thickness, how are the fringing field lines distributed?

Concentrated near the dielectric substrate

Perpendicular to the center conductor

Extended up to a certain distance from the edges of the center strip (correct)

Distributed evenly along the width of the center conductor

How do higher-order modes typically manifest in strip lines?

By having lower characteristic impedance values

As additional solutions beyond the dominant mode (correct)

Through greater losses due to increased conduction resistance

By having equal electric field distribution as the fundamental mode

What is an advantage of using numerical techniques over conformal transformation techniques in analyzing strip lines?

Allows for simpler calculations but approximate results Signup and view all the answers

What effect does increasing losses in strip lines have on the propagation characteristics?

Leads to a shift towards lower-order modes Signup and view all the answers

How is excitation typically achieved in strip lines?

Via voltage applied across the center conductor and ground plates Signup and view all the answers

What are the two types of losses that occur in a microstrip line?

Dielectric loss and ohmic loss Signup and view all the answers

Which type of loss accounts for the finite nonzero conductivity in the strip conductor and ground plane?

Ohmic loss Signup and view all the answers

In microstrip lines, where is the current usually minimum and maximum assuming a uniform distribution?

Minimum at the edges, maximum at the center Signup and view all the answers

What does a quarter-wave transformer do in microstrip line applications?

Improves impedance matching Signup and view all the answers

To minimize energy reflection in microstrip line connections to loads, which technique is commonly used?

Impedance matching with stubs Signup and view all the answers

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 Signup and view all the answers

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. Signup and view all the answers

For a symmetric stripline with a wide center strip ($w/b >> 0.35$), what is the expression for the characteristic impedance $Z_0$?

$Z_0 = rac{rac{rac{w/b}{rac{1}{w/b}}}}{rac{w}{b}}$ Signup and view all the answers

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. Signup and view all the answers

What is the primary source of attenuation in a low-loss dielectric stripline?

Conductor losses Signup and view all the answers

How are striplines typically excited?

Using a coaxial line interface with a special launcher or connector. Signup and view all the answers