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SL Interdigital Capacitor, Parallel (SLICAPP)

SL Interdigital Capacitor, Parallel (SLICAPP)

Properties	Description	Units	Default	Range
N	Number of fingers	none	Required	³ 2
W	Finger width	m	Required	> 0
S	Spacing between adjacent fingers	m	Required	> 0
L	Length of finger overlap	m	Required	> 0
WT	Terminal strip width	m	Required	³ 0
WF1	Feedline widths (ports 1 and 2)	m	Required	> 0
WF2	Output line width (port 3)	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
sub	Substrate name	none	Required	string

Notes

1. The output line width, WF2, must be less than or equal to the total width of the capacitor:
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 step from the terminal strip to the output line at port 3. A T-junction is used to model the connection between the feeding line and the ICAP fingers.

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 WF2=WCA, so that the response will not include the effects of the terminal strip and the step. 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 the feeding line, while (N-1)/2 fingers are connected to port 3 , 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

SLICAPP:NAME n1 n2 n3 N=val W=val S=val L=val WT=val
+ WF1=val WF2=val [WCA=val] GAP=val SUB=label

Netlist Example

SLICAPP:ICAP1 1 2 3 N=25 W=20UM S=10UM L=76UM WT=50UM
+ WF1=625UM WF2=625UM WCA=740UM GAP=2UM SUB=SUB1

where SUB1 needs to be defined in the corresponding .SUB statement.

References

1. 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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