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System Simulator >
System Component Models >
Microstrip >
MS Interdigital Capacitor, Series (MSICAPSE)

MS Interdigital Capacitor, Series (MSICAPSE)

Properties	Description	Units	Default	Range
N	Number of fingers	none	Required	³ 2
W	Finger width	m	Required	> 0
S	Finger spacing	m	Required	> 0
L	Length of finger overlap	m	Required	> 0
WT	Terminal strip width	m	Required	³ 0
WF1	Line width at port 1	m	Required	> 0
WF2	Line width at port 2	m	Required	> 0
WCA	Capacitor width	m	NW+(N-1)S	³ NW+(N-1)S
GAP	Gap between end of finger and terminal strip	m	Required	> 0
FT	Transition Frequency	GHz	Required	> 0
sub	Substrate name	none	Required	string
CoSimulator	Simulation engine	none		Planar EM
CoSimStackup	Stackup used for simulation	none	Layout Stackup	Layout Stackup, Footprint stackup, Substrate

Notes

1. The feeding lines 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 feeding lines to the terminal strips.

4. The capacitor width WCA is an optional parameter, with a default value of (N*W+(N-1)*S). It can be set to a value larger than the default value (see figure below). The user will get an error message if WCA is set less than the default value.

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

6. In the case of odd number of fingers, the model assumes that (N+1)/2 fingers are connected to port 1, while (N-1)/2 fingers are connected to port 2, as shown in the dimensional drawing.

7. 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) are taken into account in the model.

Netlist Form

MSICAPSE:NAME n1 n2 N=val W=val S=val L=val WT=val
+ WF1=val WF2=val [WCA=val] GAP=val SUB=label

Netlist Example

MSICAPSE:ICAPSE 1 2 N=25 W=40UM S=10UM L=76UM WT=50UM WF1=625UM WF2=625UM GAP=2UM SUB=SUB1

where sub1 needs to be defined in the corresponding .sub statement.

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”, IEE Proc., Pt. H, June 1986, pp. 191-197.

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