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Transmission Line Designer >
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Edge-Coupled Asymmetric Microstrip Transmission Lines

Edge-Coupled Asymmetric Microstrip Transmission Lines

Keyword	Default	Unit	Description
W1	Req (Phys)	m	Width of conductor 1
W2	Req (Phys)	m	Width of conductor 2
S	Req (Phys)	m	Spacing between conductors
P	0	m	Physical length of transmission line
Zc1	Req (Elec)	ohm	c-mode impedance of line 1 for even-like modes
Zc2	Req (Elec)	ohm	c-mode impedance of line 2 for even-like modes
Zp1	Req (Elec)	ohm	π-mode impedance of line 1 for odd-like modes
Zp2	Req (Elec)	ohm	π -mode impedance of line 2 for odd-like modes
E	0	deg	Electrical length of the coupled lines
Frequency	0	Hz	Analysis frequency
ER	Required		Relative dielectric constant
H	Required	m	Substrate thickness
HU	40*H	m	Cover height above substrate (default value has negligible effect)
TAND	0		Dielectric loss tangent
RGH	0	m	Rms surface roughness

Analysis

• For analysis, the parameters W1, W2, S, H, and ER must be entered prior to clicking the Analysis button. The electrical properties, Zc1, Zc2, Zp1, Zp2 will be computed. The frequency will be used if entered; otherwise, 0 Hz will be used in the calculation.

• Conversion from physical length to electrical length, enter values for P and Frequency, and click Analysis to compute E. The average effective dielectric constant computed at Frequency will be used for the calculation.

Dielectric Substrates

A dielectric substrate is defined by the parameters H, ER, and TAND. The substrate is assumed 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 propagation characteristics. Up to three conductors of different metal and different thickness 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 asymmetric coupled microstrip transmission lines are:

Frequency
Spacing, S

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

To maintain accuracy, the following limitations should be followed:

0.01 ≤ W/H ≤ 100

1 ≤ εr ≤ 128

0.1 < S/H < 10.0

Example

To select the asymmetric coupled microstrip medium, select TRL on the Product menu, click Microstrip, and click ACPL. Set the units to mm and GHz. We will use the following parameters to analyze an ACPL (synthesis is not implemented for ACPL):

Spacing, S: 0.1 mm

Width of line 1, W1: 0.2 mm

Width of line 2, W2: 0.3 mm

Substrate height, H: 0.635 mm

Dielectric constant, ER: 9.8

Frequency: 10 GHz

Click the Analysis button to determine the coupled line parameters:

c-mode impedance of line 1, Zc1: 115.97 ohms

c-mode impedance of line 2, Zc2: 93.12 ohms

π-mode impedance of line 1, Zp1: 44.17 ohms

π-mode impedance of line 2, Zp2: 35.47 ohms

c-mode effective ER, Effc: 6.768

π-mode effective ER, Effp: 5.531

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