MRInd (Microstrip Rectangular Inductor) SmartComponent

Symbol

Parameters

Name	Description	Unit	Default
Subst	Microstrip substrate name	None	MSub1
F	Center frequency	GHz	1
L	Inductance	nH	1
IndType	Inductance type (no bridge or wire bridge)	mil	No Bridge
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
Dw	Diameter of bridge round wire (for MRINDWBR)	mil	0.4
Rb	Resistivity (relative to gold) of bridge wire (for wire bridge)	None	1
Hw	Height of wire above inductor (for wire bridge)	mil	15
Aw	Angle of departure from innermost segment (for wire bridge)	None	0
WE	Extension of bridge beyond inductor (for wire bridge)	mil	4
Delta	Incremental number of segments for tuning inductance (need not be integer)	None	0

Notes

1. MRInd designs a microstrip rectangular inductor. The underlying design uses the MRINDNBR and MRINDWBR components 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 Rb and Hw are not actually used in the design process, and therefore final tuning is required to achieve the proper value of the inductance.
4. The value of IndType specifies the type of inductor that will be designed. If this parameter is set to "No Bridge", then the MRINDNBR component is designed and the parameters from Dw to WE are ignored. If the parameter is set to "Wire Bridge", then the MRINDWBR component is designed and the parameters from Dw to WE are used.
5. 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.
6. The values Ln, Ln1, and Ln2 represent the lengths Ln, Ln-1, and Ln-2 associated with the MRINDNBR and MRINDWBR components. For more detailed discussion of these lengths as well as the parameters W through WE, please refer to the discussion of these components in the Microstrip Components documentation.
7. 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.

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

Example

A MRInd component with no bridge 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 = 0.52 would achieve the desired inductance.