RF Designer - Components (Microstrip Elements)

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All components found in the microstrip catalog require a substrate to be defined in RF Designers Substrate Manager. This can be found under Settings->Substrates on the Action Bar menu. If a substrate for a component is not selected when simulating the circuit, RF Designer will choose the first substrate defined in the Substrate Manager for the simulation. If no substrate has been defined, the simulation will stop and an error dialog will appear.

MLIN - Microstrip Transmission Line

Name	Description	Units	Default Value
W	Width	Dimension	45 mil
L	Length	Dimension	1000 mil
SUB	Substrate		First substrate in list

Model for a microstrip transmission line with width W and length L. This model requires a substrate to be defined in the Substrate Manager which can be found under Setting->Substrates.

MCLIN - Symmetric Edge Coupled Microstrip Transmission Lines

Name	Description	Units	Default Value
W	Width	Dimension	45 mil
S	Gap	Dimension	20 mil
L	Length	Dimension	1000 mil
SUB	Substrate		First substrate in list

Model for a pair of symmetric edge coupled microstrip transmission lines. Width W defines the trace width for both of the coupled microstrip lines whose length is define by L. The coupled lines are seperated by a gap distance of S. This model requires a substrate to be defined in the Substrate Manager which can be found under Setting->Substrates.
This model is accurate for
0.1 ≤ W/H ≤ 10
0.1 ≤ S/H ≤ 10
1 ≤ εr ≤ 18
where H is the height of the substrate being used.

MTEE - Microstrip Tee Junction

Name	Description	Units	Default Value
W1	Width	Dimension	45 mil
W2	Width	Dimension	45 mil
W3	Width	Dimension	45 mil
SUB	Substrate		First substrate in list

Model for a three way right angle microstrip junction. Nodes 1 and 2 are directly through and node 3 is perpendicular to nodes 1 and 2. All three ports should be connected to a microstrip element (e.g., MLIN) which has a width matching the port it is connected to. This model requires a substrate to be defined in the Substrate Manager which can be found under Setting->Substrates.

MCROS - Microstrip Cross Junction

Name	Description	Units	Default Value
W1	Width	Dimension	45 mil
W2	Width	Dimension	45 mil
W3	Width	Dimension	45 mil
W4	Width	Dimension	45 mil
SUB	Substrate		First substrate in list

Model for a four way microstrip cross junction. Nodes 1 and 3 are nodes 2 and 4 are through and perpendicular to nodes 1 and 3. All four ports should be connected to a microstrip element (e.g., MLIN) which has a width matching the port it is connected to. This model requires a substrate to be defined in the Substrate Manager which can be found under Setting->Substrates.

MBENDO - Optimal Right Angle Mitered Microstrip Bend

Name	Description	Units	Default Value
W	Width	Dimension	45 mil
SUB	Substrate		First substrate in list

Model for an optimal right angle mitered microstrip bend. The width of the microstrip is defined by W and is the same for both nodes. The length of the miter is determined by the formula: √2(1.04 + 1.3 * exp(-1.35 * W / H)) where H is the height of the microstrip substrate. This model requires a substrate to be defined in the substrate manager found under Settings->Substrates.
This model is accurate to within 4% under the following conditions:
W/H ≥ 0.25 (where H is the microstrip substrate height)
εr ≤ 25

MBEND - Right Angle Un-mitered Microstrip Bend

Name	Description	Units	Default Value
W	Width	Dimension	45 mil
SUB	Substrate		First substrate in list

Model for an unmitered 90 degree microstrip bend. The width of the microstrip is defined by W and is the same for both ports. This model requires a substrate to be defined in the substrate manager found under Settings->Substrates.
This model is accurate to within .3% under the following conditions:
0.2 ≤ W/H ≤ 6.0 (where H is the substrate height)
2.0 ≤ εr ≤ 13

MBEND2 - 50% Mitered Right Angle Microstrip Bend

Name	Description	Units	Default Value
W	Width	Dimension	45 mil
SUB	Substrate		First substrate in list

Model for a 50% mitered 90 degree microstrip bend. The width of the microstrip is defined by W and is the same for both nodes. This model requires a substrate to be defined in the substrate manager found under Settings->Substrates.
This model is accurate to within .3% under the following conditions:
0.2 ≤ W/H ≤ 6.0 (where H is the substrate height)
2.0 ≤ εr ≤ 13


MCURVE - Microstrip Radiused Bend

Name	Description	Units	Default Value
W	Width	Dimension	45 mil
ANG	Angle of bend	Angle	90°
R	Radius of bend centerline	Dimension	180 mil
SUB	Substrate		First substrate in list

Model for a microstrip radiused bend. Width (W) defines the microstrip trace width at both nodes. Angle (ANG) is the angle through which the bend sweeps and the radius (R) is defined to the centerline of the trace. The angle is limited to a maximum of 180° (π radians). The bend is modeled as a straight MLIN whose length is calculated as ANG / 360 * 2π * R. This model requires a substrate to be defined in the substrate manager found under Settings->Substrates.

MLOC - Open Circuit Microstrip Transmission Line

Name	Description	Units	Default Value
W	Width	Dimension	45 mil
L	Length	Dimension	100 mil
SUB	Substrate		First substrate in list

Model for a length of open-circuited microstrip transmission line with width W and length L. This model does not take into account the loss or capacitance at the open end of the line. This model requires a substrate to be defined in the Substrate Manager which can be found under Setting->Substrates.

MLSC - Short Circuit Microstrip Transmission Line

Name	Description	Units	Default Value
W	Width	Dimension	45 mil
L	Length	Dimension	100 mil
SUB	Substrate		First substrate in list

Model for a length of short-circuited microstrip transmission line with width W and length L. This model does not take into account the loss or inductance at the shorted end of the line. It is assumed that the line terminates into a perfect electrical conductor that is a ground reference. This model requires a substrate to be defined in the Substrate Manager which can be found under Setting->Substrates.

MLEF - Open Circuit Microstrip Transmission Line with End Effect

Name	Description	Units	Default Value
W	Width	Dimension	45 mil
L	Length	Dimension	100 mil
SUB	Substrate		First substrate in list

Model for a length of open-circuited microstrip transmission line with width W and length L including the open end effect. This model requires a substrate to be defined in the Substrate Manager which can be found under Setting->Substrates.

MSTEP - Microstrip Abrubt Step in Width

Name	Description	Units	Default Value
W1	Node 1 Width	Dimension	50 mil
W2	Node 2 Width	Dimension	20 mil
SUB	Substrate		First substrate in list

Model for an abrupt step in the width of a microstrip transmission line. For best results, nodes 1 and 2 should be connected to microstrip elements with the same widths defined by W1 and W2. This model requires a substrate to be defined in the Substrate Manager which can be found under Setting->Substrates.

MGAP - Gap in Microstrip

Name	Description	Units	Default Value
W	Width	Dimension	45 mil
S	Gap Length	Dimension	5 mil
SUB	Substrate		First substrate in list

Model for a series gap in a microstrip transmission line. The width of the microstrip is defined by W and is the same for both sides of the gap. The length of the gap is defined by S. For best results, both ends of the MGAP component should be connected to a stripline component whose width matches the defined width W. This model requires a substrate to be defined in the Substrate Manager which can be found under Setting->Substrates.
This model is accurate to within 7% under the following conditions:
0.1 ≤ S/W ≤ 1
2.5 ≤ εr ≤ 10