Glossary of Generic RF Devices & Physical Transmission Lines

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Bond Wire Above Ground

GK55.png

This is a two-pin, one-port device that models a bond wire including the ground effect.

Model Identifier: BondWire-Free

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
r wire radius mm 0.1
l pad spacing mm 1.0
h height above ground mm 1.0
sigma wire conductivity S/m 1e8

Bond Wire (Free-Space)

GK54.png

This is a two-pin, one-port device that models a bond wire with no ground effect.

Model Identifier: BondWire-Free

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
r wire radius mm 0.1
l pad spacing mm 1.0
sigma wire conductivity S/m 1e8

Chip Resistor

G94.png

This is a four-pin, two-port device that models a semiconductor chip resistor. The resistor is made of a thin film deposited between two Ohmic pads on a dielectric substrate.

Model Identifier: chip resistor

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w thin film width mm 1.0
l thin film length mm 2.0
d thin film thickness mm 0.1
sigma thin film conductivity S/m 5.0
wp Ohmic pad width mm 2.0
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2

Coaxial Line

G91.png

This is a four-pin, two-port device that models a coaxial line segment with a dielectric core.

Model Identifier: coaxial-line

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
r_in inner conductor radius mm 5.0
r_out outer conductor radius mm 10.0
er core dielectric relative permittivity - 2.2
len coaxial line length mm 10.0
sigma metal conductivity S/m 1e10
tand core dielectric loss tangent - 0

Coaxial Step in Inner Conductor

G112.png

This is a four-pin, two-port device that models a step in inner conductor radius between two coaxial lines of equal outer conductor radius with a dielectric core.

Model Identifier: coaxial-innerstep

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
r_in1 smaller inner conductor radius mm 2.0
r_in2 larger inner conductor radius mm 4.0
r_out outer conductor radius mm 5.0
er core dielectric relative permittivity - 2.2

Coaxial Step in Outer Conductor

G113.png

This is a four-pin, two-port device that models a step in outer conductor radius between two coaxial lines of equal inner conductor radius with a dielectric core.

Model Identifier: coaxial-outerstep

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
r_in inner conductor radius mm 2.0
r_out1 smaller outer conductor radius mm 4.0
r_out2 larger outer conductor radius mm 6.0
er core dielectric relative permittivity - 2.2

Conductor-Backed CPW Line

GK65.png

This is a four-pin, two-port device that models a conductor-backed coplanar waveguide (CPW) line segment on a single-layer dielectric substrate with a ground plane.

Model Identifier: cbcpw-line

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w slot width mm 2.0
s center strip width mm 2.0
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2
len cpw line length mm 10.0

Coplanar Strips (CPS) Line

GK63.png

This is a four-pin, two-port device that models a coplanar strips (CPS) line segment on a single-layer conductor-backed dielectric substrate.

Model Identifier: cps-line

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w strip width mm 2
w strip spacing mm 2
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2
len line segment length m 10

Coplanar Waveguide (CPW) Line

G88.png

This is a four-pin, two-port device that models a coplanar waveguide (CPW) line segment on a single-layer dielectric substrate without a ground backing.

Model Identifier: cpw-line

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w slot width mm 2.0
s center strip width mm 2.0
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2
len cpw line length mm 10.0
sigma metal conductivity S/m 1e10
tand substrate dielectric loss tangent - 0
t metallization thickness mm 0

Coupled Microstrip Lines

G85.png

This is an eight-pin, four-port device that models two parallel coupled microstrip line segments on a single-layer conductor-backed dielectric substrate.

Model Identifier: coupled-microstrips

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w microstrip width mm 4.8
s microstrip spacing mm 5.0
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2
len microstrip length mm 10.0

Coupled Striplines

G87.png

This is an eight-pin, four-port device that models two side-by-side parallel coupled stripline segments sandwiched between two parallel plates with a dielectric spacer. In this model, the two striplines are placed at the center of the dielectric with equal distances from the top and bottom plates.

Model Identifier: coupled-striplines

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w microstrip width mm 4.8
s microstrip spacing mm 5.0
b parallel plate spacing mm 3.2
er substrate relative permittivity - 2.2
len stripline length mm 10.0

Covered CPW Line

GK66.png

This is a four-pin, two-port device that models a covered coplanar waveguide (CPW) line segment on a single-layer dielectric substrate without a ground backing but with a metal cover plate.

Model Identifier: cpw-covered

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w slot width mm 2.0
s center strip width mm 2.0
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2
hc cover height mm 10
len cpw line length mm 10

Covered Conductor-Backed CPW Line

GK67.png

This is a four-pin, two-port device that models a covered conductor-backed coplanar waveguide (CPW) line segment on a single-layer dielectric substrate with both a ground plane and a metal cover plate.

Model Identifier: cbcpw-line

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w slot width mm 2.0
s center strip width mm 2.0
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2
hc cover height mm 10
len cpw line length mm 10

Covered Microstrip Line

GK60.png

This is a four-pin, two-port device that models a covered microstrip line segment on a single-layer conductor-backed dielectric substrate.

Model Identifier: microstrip-covered

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w microstrip width mm 4.8
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2
h cover height mm 10
len microstrip length m 10

CPW Gap

G110.png

This is a four-pin, two-port device that models a gap-in-width transition between two coplanar waveguide (CPW) lines on a single-layer dielectric substrate without a ground backing.

Model Identifier: cpw-gap

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w slot width mm 2.0
s center strip width mm 2.0
g center strip gap spacing mm 2.0
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2

CPW Open End

G108.png

This is a two-pin, one-port device that models a coplanar waveguide (CPW) line segment terminated in a open end on a single-layer dielectric substrate without a ground backing.

Model Identifier: cpw-open

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w slot width mm 2.0
s center strip width mm 2.0
h substrate thickness n mm 1.6
er substrate relative permittivity - 2.2
len cpw line length mm 10.0

CPW Short End

G109.png

This is a two-pin, one-port device that models a coplanar waveguide (CPW) line segment terminated in a short end on a single-layer dielectric substrate without a ground backing.

Model Identifier: cpw-short

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w slot width mm 2.0
s center strip width mm 2.0
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2
len cpw line length mm 10.0

CPW Step

G111.png

This is a four-pin, two-port device that models a step-in-width transition between two coplanar waveguide (CPW) lines of unequal widths on a single-layer dielectric substrate without a ground backing.

Model Identifier: cpw-step

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w narrower slot width mm 2.0
s wider center strip width mm 2.0
s narrower center strip width mm 1.0
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2

CPW With a Superstrate

GK68.png

This is a four-pin, two-port device that models a coplanar waveguide (CPW) line segment on a single-layer dielectric substrate without a ground backing but with a single-layer dielectric superstrate.

Model Identifier: cpw-superstrate

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w slot width mm 2.0
s center strip width mm 2.0
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2
hs superstrate height mm 1.6
ers superstrate relative permittivity - 2.2
len cpw line length mm 10

Double-Layer CPW Line

GK69.png

This is a four-pin, two-port device that models a coplanar waveguide (CPW) line segment on a double-layer dielectric substrate without a ground backing.

Model Identifier: cpw-doublelayer

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w slot width mm 2.0
s center strip width mm 2.0
h1 lower layer substrate thickness mm 1.6
er1 lower layer substrate relative permittivity - 2.2
h2 upper layer substrate thickness mm 1
er2 upper layer substrate relative permittivity - 3.0
len cpw line length mm 10

Finite-Ground Coplanar Waveguide (FGCPW) Line

G90.png

This is a four-pin, two-port device that models a coplanar waveguide (CPW) line segment with top ground strips of finite width on a single-layer dielectric substrate without a ground backing.

Model Identifier: fgcpw-line

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w slot width mm 2.0
s center strip width mm 2.0
g ground strip width mm 5.0
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2
len cpw line length mm 10.0

Interdigital Capacitor

G97.png

This is a four-pin, two-port device that models a planar interdigital capacitor.

Model Identifier: interdigital

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w finger strip width mm 0.1
s finger strip spacing mm 0.1
N number of fingers - 5
l capacitor length mm 1.0
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2

Inverted Microstrip Line

GK62.png

This is a four-pin, two-port device that models an inverted microstrip line segment on a single-layer dielectric slab/substrate placed at a specified height above a ground plane.

Model Identifier: microstrip-inverted

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w microstrip width mm 4.8
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2
b microstrip height above ground mm 1.6
len microstrip length m 10

Loop Inductor

G96.png

This is a four-pin, two-port device that models a planar microstrip-based loop inductor.

Model Identifier: loop

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w loop radius width mm 1
l spacing mm 4
h dielectric substrate thickness mm 1.6

Metal-Insulator-Metal (MIM) Capacitor

G98.png

This is a four-pin, two-port device that models a semiconductor metal-insulator-metal (MIM) capacitor. The capacitor is made of a high permittivity thin film deposited on a microstrip line printed on a conductor-backed dielectric substrate.

Model Identifier: mimcap

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w microstrip width mm 2.0
l thin film length mm 4.0
d thin film thickness mm 0.2
erd thin film relative permittivity - 20.0
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2

Microstrip Butterfly Stub

GK51.png

This is a two-pin, one-port device that models a microstrip butterfly stub on a single-layer conductor-backed dielectric substrate.

Model Identifier: microstrip-butterfly

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
ri inner radius mm 2
ro outer radius mm 10
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2
theta wedge angle mm 90

Microstrip Cross

G105.png

This is an eight-pin, four-port device that models a cross junction between four microstrip lines on a single-layer conductor-backed dielectric substrate. In this model, the two horizontal arms represent Ports 1 and 2 and must be of equal widths. Similarly, the two vertical arms represent Ports 3 and 4 and must be of equal widths.

Model Identifier: microstrip-cross

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w1 horizontal arm microstrip width mm 4.8
w2 vertical arm microstrip width mm 4.8
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2

Microstrip Gap

GK53.png

This is a four-pin, two-port device that models a gap between two microstrip lines of equal width on a single-layer conductor-backed dielectric substrate.

Model Identifier: microstrip-gap

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w1 wider microstrip width mm 4.8
w2 narrower microstrip width mm 4.8 Must satisfy w2 < w1
s gap spacing mm 2.4
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2

Microstrip Line

G84.png

This is a four-pin, two-port device that models a microstrip line segment on a single-layer conductor-backed dielectric substrate.

Model Identifier: microstrip-line

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w microstrip width mm 4.8
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2
len microstrip length mm 10.0
sigma microstrip conductivity S/m 1e10
tand substrate dielectric loss tangent - 0
t metallization thickness mm 0
disp flag for dispersive model - 0 Select 0 for non-dispersive line, 1 for dispersion effects.

Microstrip Mitered Bend

G102.png

This is a four-pin, two-port device that models a mitered bend connecting two microstrip lines of equal width on a single-layer conductor-backed dielectric substrate.

Model Identifier: microstrip-miter

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w microstrip width mm 4.8
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2

Microstrip Open End

G99.png

This is a two-pin, one-port device that models a microstrip line segment on a single-layer conductor-backed dielectric substrate, which is terminated at an open end.

Model Identifier: microstrip-open

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w microstrip width mm 4.8
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2
len microstrip length mm 10.0

Microstrip Radial Stub

GK50.png

This is a two-pin, one-port device that models a microstrip radial stub on a single-layer conductor-backed dielectric substrate.

Model Identifier: microstrip-radial

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
ri inner radius mm 2
ro outer radius mm 10
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2
theta wedge angle mm 90

Microstrip Right-Angeled Bend

G101.png

This is a four-pin, two-port device that models a right-angled bend connecting two microstrip lines of equal width on a single-layer conductor-backed dielectric substrate.

Model Identifier: microstrip-bend

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w microstrip width mm 4.8
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2

Microstrip Slit

GK52.png

This is a four-pin, two-port device that models a microstrip slit or a narrow cut on a single-layer conductor-backed dielectric substrate.

Model Identifier: microstrip-slit

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w microstrip width mm 4.8
a slit depth mm 2
b slit width mm 1
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2

Microstrip Step

G103.png

This is a four-pin, two-port device that models a step-in-width transition between two microstrip lines of unequal widths on a single-layer conductor-backed dielectric substrate. Note that Port 1 should represent the wider microstrip line.

Model Identifier: microstrip-step

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w1 wider microstrip width mm 4.8
w2 narrower microstrip width mm 2.5 Must satisfy w2 < w1.
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2

Microstrip Tee

G104.png

This is a six-pin, three-port device that models a tee junction between three microstrip lines on a single-layer conductor-backed dielectric substrate. Note that Ports 1 and 2 should represent the main arm of the tee junction, while Port 3 represents the side arm. The microstrip lines at Ports 1 and 2 have the same width in this model.

Model Identifier: microstrip-tee

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w1 main arm microstrip width mm 4.8
w2 side arm microstrip width mm 4.8
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2

Microstrip Via

G100.png

This is a two-pin, one-port device that models a microstrip line segment on a single-layer conductor-backed dielectric substrate, which is shorted to the ground at its end using a metal via.

Model Identifier: microstrip-via

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
r via radius mm 1.0
h substrate thickness mm 1.6

Off-Center Stripline

GK64.png

This is a four-pin, two-port device that models an off-center stripline segment sandwiched between two parallel plates with a dielectric spacer. In this model, the stripline is placed below the centerline and closer to the bottom plate.

Model Identifier: stripline-offcetner

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w strip width mm 4.5
s offset from center line mm 0.5
t strip thickness mm 3.2
b parallel plate spacing mm 3.2
er substrate relative permittivity - 2.2
len stripline length mm 10.0

Spiral Inductor

G95.png

This is a four-pin, two-port device that models a planar spiral inductor.

Model Identifier: spiral

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w strip width mm 0.1
s spacing mm 0.1
D_out outer diameter mm 5.0
N number of turns - 10

Stripline

G86.png

This is a four-pin, two-port device that models a stripline segment sandwiched between two parallel plates with a dielectric spacer. In this model, the stripline is placed at the center of the dielectric with equal distances from the top and bottom plates.

Model Identifier: stripline

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w strip width mm 4.8
b parallel plate spacing mm 3.2
er substrate relative permittivity - 2.2
len stripline length mm 10.0
sigma metal conductivity S/m 1e10
tand substrate dielectric loss tangent - 0
t strip thickness mm 0

Stripline Gap

GK58.png

This is a four-pin, two-port device that models a gap between two aligned striplines of the same width sandwiched between two parallel plates with a dielectric spacing.

Model Identifier: stripline-gap

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w strip width mm 4.8
s gap spacing mm 2
b parallel plate spacing mm 3.2
er substrate relative permittivity - 2.2

Stripline Mitered Bend

GK57.png

This is a four-pin, two-port device that models an optimally mitered stripline bend sandwiched between two parallel plates with a dielectric spacing.

Model Identifier: stripline-miter

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w strip width mm 4.8
b parallel plate spacing mm 3.2
er substrate relative permittivity - 2.2

Stripline Open End

G106.png

This is a two-pin, one-port device that models a stripline segment sandwiched between two parallel plates with a dielectric spacing, which is terminated at an open end.

Model Identifier: stripline-open

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w strip width mm 4.8
b parallel plate spacing mm 3.2
er substrate relative permittivity - 2.2
len strip length mm 10.0

Stripline Right-Angled Bend

GK56.png

This is a four-pin, two-port device that models a right-angled stripline bend sandwiched between two parallel plates with a dielectric spacing.

Model Identifier: stripline-bend

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w strip width mm 4.8
b parallel plate spacing mm 3.2
er substrate relative permittivity - 2.2

Stripline Step

G107.png

This is a four-pin, two-port device that models a step-in-width transition between two striplines of unequal widths sandwiched between two parallel plates with a dielectric spacing. Note that Port 1 must represent the wider stripline.

Model Identifier: stripline-step

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w1 wider strip width mm 4.8
w2 narrower strip width mm 2.5
b parallel plate spacing mm 3.2
er substrate relative permittivity - 2.2

Stripline Tee

GK59.png

This is a six-pin, three-port device that models a tee junction between three striplines sandwiched between two parallel plates with a dielectric spacing. Note that Ports 1 and 2 should represent the main arm of the tee junction, while Port 3 represents the side arm. The striplines at Ports 1 and 2 have the same width in this model.

Model Identifier: stripline-tee

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w1 width of main arm strip mm 4.5
w2 width of side arm strip mm 5.5
b parallel plate spacing mm 3.2
er substrate relative permittivity - 2.2

Suspended Microstrip Line

GK61.png

This is a four-pin, two-port device that models a suspended microstrip line segment on a single-layer dielectric slab/substrate placed at a specified height above a ground plane.

Model Identifier: microstrip-suspended

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
w microstrip width mm 4.8
h substrate thickness mm 1.6
er substrate relative permittivity - 2.2
b height of substrate above ground mm 1.6
len microstrip length m 10

Twin-Lead Line

G92.png

This is a four-pin, two-port device that models a twin-lead line segment in a dielectric medium.

Model Identifier: twin-lead

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
r wire radius mm 1.0
s wire spacing mm 5.0
er dielectric medium relative permittivity - 1.0
len twin-lead line length mm 10.0
sigma wire conductivity S/m 1e10
tand dielectric medium loss tangent - 0

Twisted-Pair Line

G93.png

This is a four-pin, two-port device that models a twisted-pair line segment with a dielectric cover. You need to specify the number of wire twist per unit length in 1/m.

Model Identifier: twisted-pair

Parameters:

NAME PARAMETER UNITS DEFAULT NOTES
r wire radius mm 1.0
s wire spacing mm 4.0
T number of twists per length 1/m 20
erc dielectric cover relative permittivity - 2.2
erm dielectric medium relative permittivity - 1.0
len twisted-pair line length mm 10.0
sigma wire conductivity S/m 1e10
tand dielectric cover loss tangent - 0

 

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