MBStub (Microstrip Butterfly Radial Stub)


Name	Description	Unit	Default
Subst	Microstrip substrate name	None	MSub1
F	Design frequency	GHz	1
Xin	Input reactance0	Ohm	0 ^† ^
Cin	Input capacitance	pF	0 ^† ^
Lin	Input inductance	nH	0 ^† ^
W	Width of feed line; set to zero if Z specified	mil	0
Z	Characteristic impedance of feed line; set to zero if Z specified	Ohm	50
Angle	Subtended angle of circular sector	None	60
D	Insertion depth of circular sector in feed line	mil	3
Delta	Length added to stub for tuning performance	mil	0
^† ^ Only one of Xin, Cin, and Lin can be non-zero

MBStub designs a microstrip butterfly radial stub given the substrate, desired input reactance, and stub dimensions.
The stub is designed by dividing the radial lines into several short segments.
For proper operation, only one of Xin, Cin, and Lin can be non-zero. If all are zero, the stub is designed to provide an open circuit.
Refer to the discussion of the MBSTUB component in the Microstrip Components documentation for a more detailed description of the model used for this component.
The optimization changes the length of the stubs to achieve the desired input reactance.
A SmartComponent subnetwork is empty until the Design Assistant is used to generate the design. Refer to Design Assistant.

A MBStub component was used to design an open circuit stub at a center frequency of 1 GHz. Optimization yielded a value of Delta = 88.786 mil.