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(Obsolete) Microstrip Lange Coupler (Closed Form): MLANGE

Symbol

Summary

This element is OBSOLETE and is replaced by the Microstrip Lange Coupler (Closed Form) (MLANG) element.

Parameters

Name Description Unit Type Default
ID Name Text TL1
N Number of strips   4
W Conductor widths Length W[1]
S Gap widths Length W[1]
L Conductor Lengths Length L[1]
MSUB Substrate definition Text MSUB[2]

[1] User-modifiable default. Modify by editing under $DEFAULT_VALUES in the default.lpf file in the root installation directory.

[2] If only one MSUB is present in the schematic, this substrate is automatically used. If multiple MSUB substrate definitions are present, you must specify which to use.

Implementation Details

This component models the multiline interdigital Lange coupler based on N edge-coupled microstrip lines.

N is the number of strips, W is the width of the strips (the widths of all the strips must be the same), S is the width of the gaps between the strips (which also must be identical), and L is the physical length of lines. W, S, and L are entered in the default length units.

MSUB indicates the name of the MSUB element to use for substrate characteristics. If blank, a default is used.

This model is most accurate in the following ranges (where H is the substrate thickness):

0.1<W/H<10

0.1<S/H<10

1<εr<18

Outside these ranges, the accuracy degrades gracefully, and the results may still be useful. Therefore, no error message is given if these limits are exceeded. Do not use this model for two-strip couplers; use MCLIN or M2CLIN instead.

This is a lossless element, dispersion is included.

Layout

This element uses line types to determine its layout. By default, the layout uses the first line type defined in your Layout Process File (LPF). You can change the element to use any of the line types configured in your process:

  1. Select the item in the layout.

  2. Right-click and choose Shape Properties to display the Cell Options dialog box.

  3. Click the Layout tab and select a Line Type.

  4. Click OK to use the new line type in the layout.

See “Cell Options Dialog Box: Layout Tab ” for Cell Options dialog box Layout tab details.

See “The Layout Process File (LPF)” for more information on editing Layout Process Files (LPFs) and to learn about adding or editing line types.

References

[1] M.Kirschning, R.Jansen, "Accurate Wide-Range Design Equations for the Frequency-Dependent Characteristics of Parallel Coupled Microstrip Lines,", IEEE Trans. Microwave Theory Tech., vol. MTT-32, 1984, p. 83-90.

[2] D. Kajfez, Z.Paunovic, S.Pavlin, "Simplified Design of Lange Coupler,", IEEE Trans. Microwave Theory Tech., vol. MTT-26, 1978, pp. 806-808.

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