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Edge-Coupled Suspended Substrate Transmission Lines

Edge-Coupled Suspended Substrate Transmission Lines

Keyword	Default	Unit	Description
W	Req (Phys)	m		Conductor width
S	Req (Phys)	m		Spacing between conductors
P	0	m		Physical length of transmission line
Z0	Req (Elec, Opt 1)	ohm		Impedance of the coupled lines
K	Req (Elec, Opt 1)	dB		Coupling coefficient (positive)
Zo	Req (Elec, Opt 2)	ohm		Odd-mode impedance of the coupled lines
Ze	Req (Elec, Opt 2)	ohm		Even-mode impedance of the coupled lines
E	0	deg		Electrical length of the coupled lines
Frequency	100 MHz	Hz		Analysis frequency
ER	Required			Relative dielectric constant
H	Req	m		Substrate thickness
HL	Req	m		Distance between bottom of substrate and ground
HU	Req	m		Cover height above substrate
A	inf.	m		Width between sidewalls
TAND	0			Dielectric loss tangent
RGH	0	m		Rms surface roughness

Synthesis and Analysis

Two options exist for synthesis of edge-coupled suspended substrate transmission lines:

— Specify impedance, Z0, and the coupling coefficient, K.

— Specify the even-mode impedance, Ze, and the odd-mode impedance, Zo.

• The substrate parameters H, HU, HL, A, and ER must be entered prior to clicking the Synthesis button. The width of the strips, W, and the spacing between them, S, will be computed. Also, the alternate electrical option set will be computed (e.g., if Z0 and K are entered, Ze and Zo will be computed).

• For analysis, the parameters W, HU, HL, and ER must be entered prior to clicking the Analysis button. The electrical properties, Z0, K, Zo, and Ze will be computed. The frequency will be used if entered; otherwise, 100 MHz 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 H, ER, and TAND. The substrate is assumed to be lossless unless TAND is specified and greater than zero.

Conductor Metallization

• The selection of the conductor is performed in the Metallization group. The conductor isn’t specified, in this case 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 edge-coupled suspended substrate lines are:

Frequency
Width, W
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

Full-wave analysis is used; there are no limitations for practical dimensions.

Example

To select the edge-coupled suspended substrate medium, select TRL on the Product menu, click Stripline, and click CPL. Set the units to mm and GHz. We will use the following parameters to synthesize a 6-dB coupler at 10 GHz:

Impedance, Z0: 50 ohms

Coupling, K: 6 dB

Frequency: 10 GHz

Substrate thickness, H: 0.635 mm

Lower height, HL: 1.0 mm

Upper height, HU: 1.0 mm

Sidewall width, A: 10.0 mm

Dielectric constant, ER: 9.8

TAND 0.001

Metal: Cu 0.01 mm

Click the Synthesis button to determine the coupler’s parameters:

Width, W: 1.122 mm

Spacing, S: 0.112 mm

Odd-mode impedance, Zo: 28.8 ohms

Even-mode impedance, Ze: 86.7 ohms

Odd-mode Keff, KO: 4.54

Even-mode Keff, KE 2.11

To specify a 1/4 wavelength line, enter:

Electrical length, E: 90

Click Synthesis again to determine the corresponding physical length:

Physical length, P: 4.12 mm

A sweep analysis can be performed on W, S, or Frequency. To perform a sweep analysis on W, type 0.8,1.2,0.05 in the W field to specify a sweep from 0.8 mm to 1.2 mm in steps of 0.05 mm. Clicking Analysis then yields the following results:

Coupled Lines in Suspended Substrate Stripline

H = 0.635mm ER = 9.80 TAND = 0.00100 T/H = 0.0157

Freq S/H W/H ZE ZO KE KO C Loss D Loss T Loss

ghz Ohms Ohms (dB/mm ) (dB/mm ) (dB/mm )

10.0 0.176 1.260 101.4 31.0 2.283 4.815 0.0102 0.0025 0.0127

10.0 0.176 1.339 98.8 30.6 2.251 4.770 0.0099 0.0025 0.0123

10.0 0.176 1.417 96.3 30.2 2.222 4.726 0.0096 0.0024 0.0120

10.0 0.176 1.496 93.9 29.8 2.194 4.682 0.0093 0.0024 0.0117

10.0 0.176 1.575 91.6 29.5 2.168 4.638 0.0091 0.0024 0.0114

10.0 0.176 1.654 89.5 29.2 2.144 4.595 0.0088 0.0024 0.0112

10.0 0.176 1.732 87.5 28.9 2.122 4.553 0.0086 0.0023 0.0110

10.0 0.176 1.811 85.5 28.6 2.101 4.511 0.0084 0.0023 0.0107

10.0 0.176 1.890 83.7 28.4 2.082 4.469 0.0082 0.0023 0.0105

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