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Interdigital Capacitor, Series

Interdigital Capacitor, Series

Netlist Form

An instance of an interdigital capacitor, series has the netlist format:

AMSICAPSExxxx n1 n2 N=val W=val S=val L=val WT=val WF1=val WF2=val WCA=val GAP=val FT=val COMPONENT=icap_series SUBSTRATE=substrate_name

n1 and n2 are the names of the nodes attached to the capacitor. The entry COMPONENT=icap_series identifies the element.

The entry SUBSTRATE=substrate_name identifies the microstrip substrate model name selected for the design (see Selecting a Microstrip Substrate). See the Microstrip (MS) Substrate for information on this substrate type.

**Interdigital Capacitor, Series Instance Parameters**
Parameter	Description	Unit	Default
N	Number of fingers	None	3
W	Width of fingers	Meter	0.1e-3
S	Spacing between fingers	Meter	0.1e-3
L	Length of overlap between fingers	Meter	1e-3
WT	Width of terminal strip	Meter	0.1e-3
WF1	Width of feedline at node n1	Meter	0.4e-3
WF2	Width of feedline at node n2	Meter	0.4e-3
WCA	Width of capacitor	Meter	Calculated
GAP	Gap between end of finger and terminal strip	Meter	0.1e-3
FT	Transition frequency	Hz	-1

Netlist Example

AMSICAPSE23 net1 Port2 N=5 W=0.001 S=0.0001 L=1.0e-3
+ COMPONENT=icap_series SUBSTRATE=FR4

where FR4, the selected layout technology or substrate type, has a definition such as:

.SUB FR4 MS( H=7.6200e-004 Er=4.4 TAND=0.02 TANM=0
+ MSat=0 MRem=0 HU=0.00508 MET1=1.72413793103448
+ T1=1.7145e-005 RGH=0mil)

Notes

1. The feedline widths WF1 and WF2 must be less than or equal to the total width of the capacitor: WF1 <= WCA and WF2 <= WCA.

2. The finger width W and the spacing between adjacent fingers S are the same for all fingers.

3. The model takes into account the effect of the steps from the feedlines to the terminal strips.

4. The capacitor width WCA has a default value of (N*W + S*(N-1)). WCA can be set to a value larger than the default. An error results if WCA is set to less than the default.

5. The terminal strip width WT can be set to zero. In this case, the user must set WF1=WF2=WCA. The response will not include the effects of the terminal strips and the steps. The user must add these effects using TRL and STEP elements

6. When the number of fingers N is odd, the model assumes that (N+1)/2 fingers are connected to node 1, while (N-1)/2 fingers are connected to node 2 (see dimensional diagram above).

7. The model takes into account the capacitance at the end of each finger and the small strips of length GAP at the beginning of each finger (outside the overlap region).

References

[1] J. Hobdell, “Optimization of Interdigital Capacitors,” IEEE Trans, on MTT, Sep 1979, pp. 788-791.

[2] X She, and Y Chow, Interdigital Microstrip Capacitor as a Four-Port Network,”IEEE Proc. Pt. H, June 1986, pp. 191-197.

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