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Ansoft Designer / Ansys Designer 在线帮助文档：

Transmission Line Designer >
Transmission Lines >
Stripline Transmission Line

Stripline Transmission Line

Keyword	Default	Unit	Description
W	Req (Phys)	m	Conductor width
P	0	m	Physical length of transmission line
Z0	Req (Elec)	ohm	Transmission line impedance
E	0	deg	Electrical length of transmission line
Frequency	0	Hz	Analysis frequency
ER	Req		Relative dielectric constant
B	Req	m	Substrate thickness
TAND	0		Dielectric loss tangent
RGH	0	m	Rms surface roughness

Synthesis and Analysis

• For synthesis of stripline transmission lines, the parameters Z0, B, and ER must be entered prior to clicking the Synthesis button. The width, W, will be computed.

• For analysis, the parameters W, B, and ER must be entered prior to clicking the Analysis button. The impedance, Z0, will be computed. The frequency will be used if entered; otherwise, 0 Hz will be used in the calculation.

• Conversion from electrical length, E, to physical length, P, can be performed by entering values for E and Frequency. Click Synthesis to compute P. Similarly, to convert from physical length to electrical length, enter values for P and Frequency, and click Analysis to compute E.

Dielectric Substrates

A dielectric substrate is defined by the parameters B, ER, and TAND. The substrate is assumed to be lossless unless TAND is specified and greater than zero.

Conductor Metallization

• Conductor specification is performed in the Metallization control group. If the conductor is not specified, the conductor loss is zero and no thickness corrections are made to the line’s propagation characteristics. Up to three conductors of different metals and thicknesses can be specified.

• Metallization rms surface roughness, RGH, can be specified for additional conductor losses due to imperfect metal surfaces. RGH is specified in terms of rms variation from an ideal flat surface.

Sweep Options

Parameters that can be swept for the stripline transmission line are:

Frequency
Width, W

The order shown is the order used to generate output data when multiple parameters are swept simultaneously. Refer to the Sweep Entries section for further information.

Limitations

Error less than 0.5% for W/B < 10.

Example

To select the stripline medium, pull down the Structure menu, click Stripline, and click Single. Set the units to mm and GHz. We will use the following parameters to synthesize a stripline:

Impedance, Z0: 50 ohms

Dielectric constant, ER: 2.2

Substrate thickness, B: 1.27 mm

Click the Synthesis button to determine the width, W, of the transmission line:

Width, W: 1.05 mm

Since stripline is a TEM structure and does not vary with frequency, we will perform a sweep analysis on the width of the strip instead. Type 0.5, 3.0, 0.5 into the W box to sweep the line’s width from 0.5 mm to 3.0 mm in steps of 0.5 mm. Be sure to supply information on the line’s metallization and losses:

Metal: Cu 0.01 mm

TAND: 0.001

Clicking Analysis yields the following:

Single Stripline

B = 1.270mm ER = 2.20 TAND = 0.00100 T/B = 0.0079

Freq Width W/B Z0 D Loss C Loss T Loss

ghz mm Ohms dB/mm dB/mm dB/mm

0.0 0.500 0.394 74.86 0.0000 0.0002 0.0002

0.0 1.000 0.787 50.69 0.0000 0.0002 0.0002

0.0 1.500 1.181 38.41 0.0000 0.0001 0.0001

0.0 2.000 1.575 30.93 0.0000 0.0001 0.0001

0.0 2.500 1.969 25.90 0.0000 0.0001 0.0001