MREInd (Microstrip Elevated Rectangular Inductor)

Symbol

Parameters

Name	Description	Unit	Default
Subst	Microstrip substrate name	None	MSub1
F	Center frequency	GHz	1
L	Inductance	nH	1
Ln	Length of innermost segment (0 means full length)	mil	0
Ln1	Length of second innermost segment	mil	2.5
Ln2	Length of second innermost segment	mil	3.5
W	Conductor width	mil	1
S	Conductor spacing	mil	1
Hi	Elevation of inductor above substrate	mil	12.5
Ti	Thickness of conductors	mil	0.1
Ri	resistivity (relative to gold) of conductors	None	1
Sx	spacing limit between support posts (0 to ignore posts)	mil	0
Cc	coefficient for capacitance of corner support posts	None	2
Cs	coefficient for capacitance of support posts along segment	None	1
Wu	width of underpass strip conductor	mil	0.4
Au	angle of departure from innermost segment	None	0
UE	extension of underpass beyond inductor	mil	4
Delta	incremental number of segments for tuning inductance (need not be integer)	None	0

Notes

1. MREInd designs an elevated microstrip rectangular inductor. The underlying design uses the MRINDELA component contained in the Tlines-Microstrip palette.
2. The design is accomplished using a simple model that specifies the number of segments in the rectangular inductor required to achieve the inductance L at the design center frequency given the remaining physical parameters.
3. The parameters from Hi through Cs are not actually used in the design process, and therefore final tuning is required to achieve the proper value of the inductance.
4. The tuning parameter Delta represents the number of additional segments to add to the outside of the structure. If it is not an integer value, the outermost segment (L1) will not be full length, with the fractional remainder of Delta specifying the fractional length of this outermost segment. The design process may not produce the parameters that perfectly achieve the specified inductance. Manual tuning of the inductance can be performed by specifying the parameter Delta, which represents the number of turns to add to the design. For example, if the design process determines that the number of required turns is 1.2 and Delta is set to 0.3, the actual number of turns in the underlying inductor design will be 1.2+0.3=1.5. Delta can be positive or negative and, as shown in this example, need not be an integer.
5. The values Ln, Ln1, and Ln2 represent the lengths Ln, Ln-1, and Ln-2 associated with the MRINDELA component. For more detailed discussion of these lengths as well as the parameters from W through UE, please refer to the discussion of MRINDELA in the Microstrip Components documentation.
6. Because of the difficulties associated with tuning the inductor using additional discrete segments, no Optimization Assistant is provided. However, tuning can be accomplished quite effectively by manually updating the value of Delta from within the Simulation Assistant. Refer to Optimization Assistant, as well as the following example for more details.

A SmartComponent subnetwork is empty until the Design Assistant is used to generate the design. Refer to Design Assistant.

Example

A MREInd component was used to design a 1 nH inductor at a center frequency of 3 GHz. The design used a full-length innermost segment. By tuning the number of segments within the Simulation Assistant, it was determined that a value of Delta = 1.63 would achieve the desired inductance.