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Transmission Line Designer >
Transmission Lines >
Offset Stripline Transmission Line

Offset 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
BL	Req	m	Offste spacing
TAND	0		Dielectric loss tangent
RGH	0	m	Rms surface roughness

Synthesis and Analysis

• To synthesize offset stripline transmission lines, the parameters Z0, B, BL, and ER must be entered prior to clicking the Synthesis button. The width, W, will be computed.

• For analysis, the parameters W, B, BL, 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, BL, 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 structure’s propagation characteristics. Up to three conductors of different metals and thicknesses can be selected.

• 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 offset 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, select TRL on the Product menu, click Stripline, and click OSL. Set the units to mm and GHz. We will use the following parameters to synthesize an offset stripline:

Impedance, Z0: 50 ohms

Dielectric constant, ER: 2.2

Substrate thickness, B: 2 mm

Offset Spacing, BL: 0.5mm

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

Width, W: 1.1982 mm

Since offset 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 field to sweep the width from 0.5 mm to 3.0 mm in steps of 0.5 mm. Be sure to supply metal and loss information:

Metal: Cu 0.01 mm

TAND: 0.001

Click Analysis. The following warning message appears:

W/(B-T-BL) >0.7

Clicking Yes yields the following results:

Offset Stripline

B = 2.000mm BL = 0.500mm ER = 2.20 TAND =0.00100 T/B =0.0050

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

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

0.0 0.500 0.250 79.93 0.0000 0.0004 0.0004

0.0 1.000 0.500 55.40 0.0000 0.0002 0.0002

0.0 1.500 0.750 42.74 0.0000 0.0002 0.0002