def z0_for_width(width: float) -> float:
"""
"""
sim = Simulation(freq=freq,
unit=1e-3,
reference_frequency=ref_freq,
sim_dir=None)
pcb = PCB(
sim=sim,
pcb_prop=pcb_prop,
length=pcb_len,
width=pcb_width,
layers=range(3),
omit_copper=[0],
)
Microstrip(
pcb=pcb,
position=Coordinate2(0, 0),
length=pcb_len,
width=width,
propagation_axis=Axis("x"),
port_number=1,
excite=True,
ref_impedance=50,
)
Mesh(
sim=sim,
metal_res=1 / 80,
nonmetal_res=1 / 10,
min_lines=5,
expand_bounds=((0, 0), (0, 0), (10, 40)),
)
sim.run(csx=False)
return np.abs(sim.ports[0].impedance(freq=ref_freq))
def func(min_lines: int):
sim = Simulation(freq=freq,
unit=unit,
reference_frequency=ref_freq,
sim_dir=None)
pcb = PCB(
sim=sim,
pcb_prop=pcb_prop,
length=pcb_len,
width=pcb_width,
layers=range(3),
omit_copper=[0],
)
Microstrip(
pcb=pcb,
position=Coordinate2(0, 0),
length=pcb_len,
width=trace_width,
propagation_axis=Axis("x"),
port_number=1,
excite=True,
)
Mesh(
sim=sim,
metal_res=1 / 80,
nonmetal_res=1 / 10,
smooth=(1.1, 1.5, 1.5),
min_lines=min_lines,
expand_bounds=((0, 0), (0, 0), (10, 40)),
)
sim.run(csx=False)
return sim.ports[0].impedance()
def func(gnd_gap: float):
sim = Simulation(freq=freq,
unit=unit,
reference_frequency=ref_freq,
sim_dir=None)
pcb = PCB(
sim=sim,
pcb_prop=pcb_prop,
length=pcb_len,
width=pcb_width,
layers=range(3),
)
Microstrip(
pcb=pcb,
position=Coordinate2(0, 0),
length=pcb_len,
width=trace_width,
propagation_axis=Axis("x"),
gnd_gap=(gnd_gap, gnd_gap),
port_number=1,
excite=True,
ref_impedance=50,
)
Mesh(
sim=sim,
metal_res=1 / 80,
nonmetal_res=1 / 10,
min_lines=9,
expand_bounds=((0, 0), (0, 0), (10, 40)),
)
sim.run(csx=False)
return np.abs(sim.ports[0].impedance(freq=ref_freq))
def sim_impedance(sim: Simulation):
"""
Get the characteristic impedance of a simulation.
"""
sim.run(csx=False)
ports = sim.ports
z0 = ports[0].impedance()
idx = array_index(sim.center_frequency(), sim.freq)
return np.abs(z0[idx])
def gcpw(trace_width: float):
"""
"""
sim = Simulation(freq=freq, unit=1e-3)
pcb = PCB(
sim=sim,
pcb_prop=pcb_prop,
length=pcb_len,
width=pcb_width,
layers=range(3),
)
box = Box2(
Coordinate2(-pcb_len / 2, -trace_width / 2),
Coordinate2(pcb_len / 2, trace_width / 2),
)
Microstrip(
pcb=pcb,
position=box.center(),
length=box.length(),
width=box.width(),
propagation_axis=Axis("x"),
trace_layer=0,
gnd_layer=1,
gnd_gap=(gap, gap),
port_number=1,
ref_impedance=50,
excite=True,
)
ViaWall(
pcb=pcb,
position=Coordinate2(0, trace_width / 2 + gap + via_gap),
length=pcb_len,
width=via_gap / 2,
)
ViaWall(
pcb=pcb,
position=Coordinate2(0, -trace_width / 2 - gap - via_gap),
length=pcb_len,
width=via_gap / 2,
)
Mesh(
sim=sim,
metal_res=1 / 120,
nonmetal_res=1 / 40,
smooth=(1.1, 1.5, 1.5),
min_lines=25,
expand_bounds=((0, 0), (24, 24), (24, 24)),
)
sim.run(csx=False)
return np.average(np.abs(np.abs(sim.ports[0].impedance()) - 50))
def func(width: float):
sim = Simulation(freq=freq,
unit=unit,
reference_frequency=ref_freq,
sim_dir=None)
pcb_prop = common_pcbs["oshpark4"]
pcb = PCB(
sim=sim,
pcb_prop=pcb_prop,
length=pcb_len,
width=pcb_width,
layers=range(3),
omit_copper=[0],
)
DifferentialMicrostrip(
pcb=pcb,
position=Coordinate2(0, 0),
length=pcb_len,
width=width,
gap=trace_gap,
propagation_axis=Axis("x"),
port_number=1,
excite=True,
ref_impedance=50,
)
Mesh(
sim=sim,
metal_res=1 / 80,
nonmetal_res=1 / 10,
min_lines=9,
expand_bounds=((0, 0), (0, 0), (10, 40)),
)
FieldDump(
sim=sim,
box=Box3(
Coordinate3(-pcb_len / 2, -pcb_width / 2, 0),
Coordinate3(pcb_len / 2, pcb_width / 2, 0),
),
dump_type=DumpType.current_density_time,
)
sim.run(csx=False)
return np.abs(sim.ports[0].impedance(freq=ref_freq))
def gen_sim(width: float) -> Simulation:
"""
Create simulation objects to sweep over.
:param width: Top layer trace width. This is the parameter we
sweep over.
"""
sim = Simulation(freq=freq, unit=1e-3)
pcb = PCB(
sim=sim,
pcb_prop=pcb_prop,
length=pcb_len,
width=pcb_width,
layers=range(3),
)
box = Box2(
Coordinate2(-pcb_len / 2, -width / 2),
Coordinate2(pcb_len / 2, width / 2),
)
Microstrip(
pcb=pcb,
position=box.center(),
length=box.length(),
width=box.width(),
propagation_axis=Axis("x"),
trace_layer=0,
gnd_layer=1,
gnd_gap=(gap, gap),
port_number=1,
feed_shift=0.3,
ref_impedance=50,
excite=True,
)
Mesh(
sim=sim,
metal_res=1 / 80,
nonmetal_res=1 / 40,
smooth=(1.2, 1.5, 1.5),
min_lines=25,
expand_bounds=((0, 0), (8, 8), (8, 20)),
)
return sim_impedance(sim)
from pyems.mesh import Mesh
from pyems.field_dump import FieldDump, DumpType
from pyems.utilities import print_table, mil_to_mm
from pyems.csxcad import (
add_metal,
add_material,
add_conducting_sheet,
colors,
construct_box,
construct_cylinder,
)
freq = np.arange(0, 18e9, 1e7)
ref_freq = 5.6e9
unit = 1e-3
sim = Simulation(freq=freq, unit=unit, reference_frequency=ref_freq)
coax_len = 10
trace_width = 0.38
coax_dielectric = common_dielectrics["PTFE"]
coax_rad = mil_to_mm(190 / 2) # RG-141
core_rad = (coax_core_diameter(
2 * coax_rad, coax_dielectric.epsr_at_freq(sim.reference_frequency)) / 2)
sma_lead_len = 1.9
sma_lead_width = 0.51
sma_lead_height = 0.25
# sma_keepout_width = sma_lead_width + 2 * gap
sma_rect_width = 9.53
sma_rect_height = 7.92
def func(params: List[float]):
"""
"""
cutout_width = params[0]
sim = Simulation(freq=freq, unit=unit, sim_dir=None)
pcb = PCB(
sim=sim,
pcb_prop=pcb_prop,
length=pcb_len,
width=pcb_width,
layers=range(3),
omit_copper=[0],
)
box = Box2(
Coordinate2(-pcb_len / 2, -trace_width / 2),
Coordinate2(-(cap_dim.length / 2) - (pad_length / 2), trace_width / 2),
)
Microstrip(
pcb=pcb,
position=box.center(),
length=box.length(),
width=box.width(),
propagation_axis=Axis("x"),
trace_layer=0,
gnd_layer=1,
port_number=1,
excite=True,
feed_shift=0.35,
ref_impedance=z0_ref,
)
SMDPassive(
pcb=pcb,
position=Coordinate2(0, 0),
axis=Axis("x"),
dimensions=cap_dim,
pad_width=pad_width,
pad_length=pad_length,
c=10e-12,
pcb_layer=0,
gnd_cutout_width=cutout_width,
gnd_cutout_length=1,
)
box = Box2(
Coordinate2(pcb_len / 2, trace_width / 2),
Coordinate2((cap_dim.length / 2) + (pad_length / 2), -trace_width / 2),
)
Microstrip(
pcb=pcb,
position=box.center(),
length=box.length(),
width=box.width(),
propagation_axis=Axis("x", direction=-1),
trace_layer=0,
gnd_layer=1,
port_number=2,
excite=False,
ref_impedance=z0_ref,
)
Mesh(
sim=sim,
metal_res=1 / 120,
nonmetal_res=1 / 40,
smooth=(1.2, 1.2, 1.2),
min_lines=5,
expand_bounds=((0, 0), (0, 0), (10, 20)),
)
sim.run(csx=False)
print_table(
data=[sim.freq / 1e9, sim.s_param(1, 1), sim.s_param(2, 1)],
col_names=["freq", "s11", "s21"],
prec=[4, 4, 4],
)
return np.sum(sim.s_param(1, 1))
from pyems.pcb import common_pcbs
from pyems.structure import (
DifferentialMicrostrip,
PCB,
common_smd_passives,
SMDPassive,
)
from pyems.coordinate import Coordinate2, Axis, Box3, Coordinate3
from pyems.utilities import print_table, mil_to_mm
from pyems.field_dump import FieldDump, DumpType
from pyems.mesh import Mesh
freq = np.arange(4e9, 18e9, 10e6)
unit = 1e-3
ref_freq = 5.6e9
sim = Simulation(freq=freq, unit=unit, reference_frequency=ref_freq)
pcb_len = 30
pcb_width = 10
trace_width = 0.85
gnd_gap = mil_to_mm(6)
trace_gap = mil_to_mm(6)
via_gap = 0.4
cap_dim = common_smd_passives["0402C"]
cap_dim.set_unit(unit)
pad_length = 0.6
pad_width = trace_width
pcb_prop = common_pcbs["oshpark4"]
from pyems.simulation import Simulation
from pyems.mesh import Mesh
from pyems.pcb import common_pcbs
from pyems.coordinate import Coordinate2, Axis
from pyems.utilities import print_table
freq = np.arange(1e9, 18e9, 1e7)
ref_freq = 5.6e9
unit = 1e-3
pcb_len = 10
pcb_width = 10
trace_width = 0.38
pcb_prop = common_pcbs["oshpark4"]
gnd_gap = 0.900 * trace_width
sim = Simulation(freq=freq, unit=unit, reference_frequency=ref_freq)
pcb = PCB(
sim=sim,
pcb_prop=pcb_prop,
length=pcb_len,
width=pcb_width,
layers=range(3),
)
Microstrip(
pcb=pcb,
position=Coordinate2(0, 0),
length=pcb_len,
width=trace_width,
propagation_axis=Axis("x"),
gnd_gap=(gnd_gap, gnd_gap),
import os
import sys
import numpy as np
from pyems.utilities import print_table
from pyems.port import RectWaveguidePort
from pyems.simulation import Simulation
from pyems.field_dump import FieldDump
from pyems.structure import standard_waveguides
from pyems.coordinate import Coordinate3, Box3, Axis
from pyems.mesh import Mesh
from pyems.nf2ff import NF2FF
unit = 1e-3
freq = np.linspace(5.3e9, 5.9e9, 501)
sim = Simulation(freq=freq, unit=unit)
metal = sim.csx.AddMetal("metal")
stl = metal.AddPolyhedronReader(filename=os.path.abspath("horn-antenna.stl"))
stl.ReadFile()
wg = standard_waveguides["WR159"]
wg.set_unit(unit)
wg_len = 40
port = RectWaveguidePort(
sim=sim,
box=Box3(
Coordinate3(-wg.a / 2, -wg.b / 2, -wg_len),
Coordinate3(wg.a / 2, wg.b / 2, 0),
),
propagation_axis=Axis("z"),
freq = np.linspace(4e9, 8e9, 501)
pcb_len = 40
pcb_width = 10
gcpw_width = 0.34
gcpw_gap = mil_to_mm(6)
via_gap = 0.4
# drill_radius = gcpw_width / 2 - pcb_prop.via_plating_thickness(unit)
drill_radius = 0.13
drill_diam = 2 * drill_radius
annular_width = 0.145
antipad = gcpw_gap
keepout_radius = drill_radius + annular_width + antipad
via_sep = 0.76
via_fence_sep = via_sep * 2
sim = Simulation(freq=freq, unit=unit)
pcb = PCB(sim=sim, pcb_prop=pcb_prop, length=pcb_len, width=pcb_width)
box = Box2(
Coordinate2(-pcb_len / 2, -gcpw_width / 2),
Coordinate2(pcb_len / 4, gcpw_width / 2),
)
Microstrip(
pcb=pcb,
position=box.center(),
length=box.length(),
width=box.width(),
propagation_axis=Axis("x"),
trace_layer=0,
gnd_layer=1,
gnd_gap=(gcpw_gap, gcpw_gap),
via_gap=(via_gap, via_gap),
def sim_func(cutout_width: float):
"""
"""
sim = Simulation(freq=freq, unit=unit, reference_frequency=ref_freq)
core_rad = (coax_core_diameter(
2 * coax_rad, coax_dielectric.epsr_at_freq(sim.reference_frequency)) /
2)
pcb_prop = common_pcbs["oshpark4"]
pcb = PCB(
sim=sim,
pcb_prop=pcb_prop,
length=pcb_len,
width=pcb_width,
layers=range(3),
omit_copper=[0],
)
Microstrip(
pcb=pcb,
position=Coordinate2(0, 0),
length=pcb_len,
width=trace_width,
propagation_axis=Axis("x"),
trace_layer=0,
gnd_layer=1,
port_number=1,
ref_impedance=50,
excite=True,
)
# Mueller BU-1420701851 edge mount SMA
pad = sim.csx.AddConductingSheet(
"pad",
conductivity=pcb_prop.metal_conductivity(),
thickness=pcb_prop.copper_thickness(0),
)
pad.AddBox(
priority=priorities["trace"],
start=[pcb_len / 2 - sma_lead_len / 2, -sma_lead_width / 2, 0],
stop=[pcb_len / 2, sma_lead_width / 2, 0],
)
pad_cutout = sim.csx.AddMaterial(
"gnd_cutout",
epsilon=pcb_prop.substrate.epsr_at_freq(ref_freq),
kappa=pcb_prop.substrate.kappa_at_freq(ref_freq),
)
pad_cutout.AddBox(
priority=priorities["keepout"],
start=[
pcb_len / 2 - sma_lead_len / 2,
-cutout_width / 2,
pcb.copper_layer_elevation(1),
],
stop=[pcb_len / 2, cutout_width / 2,
pcb.copper_layer_elevation(1)],
)
sma_box = sim.csx.AddMetal("sma_box")
sma_box.AddBox(
priority=priorities["ground"],
start=[
pcb_len / 2,
-sma_rect_width / 2,
-sma_rect_height / 2 + sma_lead_height / 2,
],
stop=[
pcb_len / 2 + sma_rect_length,
sma_rect_width / 2,
sma_rect_height / 2 + sma_lead_height / 2,
],
)
sma_keepout = sim.csx.AddMaterial(
"sma_keepout",
epsilon=coax_dielectric.epsr_at_freq(ref_freq),
kappa=coax_dielectric.kappa_at_freq(ref_freq),
)
sma_keepout.AddCylinder(
priority=priorities["keepout"],
start=[pcb_len / 2, 0, sma_lead_height / 2],
stop=[pcb_len / 2 + sma_rect_length, 0, sma_lead_height / 2],
radius=coax_rad,
)
for ypos in [
-sma_rect_width / 2,
sma_rect_width / 2 - sma_gnd_prong_width,
]:
# sma_box.AddBox(
# priority=priorities["ground"],
# start=[pcb_len / 2 - sma_gnd_prong_len, ypos, 0],
# stop=[
# pcb_len / 2,
# ypos + sma_gnd_prong_width,
# sma_gnd_prong_height
# ],
# )
# sma_box.AddBox(
# priority=priorities["ground"],
# start=[
# pcb_len / 2 - sma_gnd_prong_len,
# ypos,
# pcb.copper_layer_elevation(1)
# ],
# stop=[
# pcb_len / 2,
# ypos + sma_gnd_prong_width,
# pcb.copper_layer_elevation(1) - sma_gnd_prong_height,
# ],
# )
sma_box.AddBox(
priority=priorities["ground"],
start=[
pcb_len / 2 - sma_gnd_prong_len,
ypos,
pcb.copper_layer_elevation(1) - sma_gnd_prong_height,
],
stop=[
pcb_len / 2,
ypos + sma_gnd_prong_width,
sma_gnd_prong_height,
],
)
lead = sim.csx.AddMetal("lead")
lead.AddBox(
priority=priorities["trace"],
start=[pcb_len / 2 - sma_lead_len / 2, -sma_lead_width / 2, 0],
stop=[
pcb_len / 2 + sma_rect_length,
sma_lead_width / 2,
sma_lead_height,
],
)
# coax port
Coax(
sim=sim,
position=Coordinate3(
pcb_len / 2 + sma_rect_length + coax_len / 2,
0,
sma_lead_height / 2,
),
length=coax_len,
radius=coax_rad,
core_radius=core_rad,
shield_thickness=mil_to_mm(5),
dielectric=coax_dielectric,
propagation_axis=Axis("x", direction=-1),
port_number=2,
ref_impedance=50,
)
mesh = Mesh(
sim=sim,
metal_res=1 / 120,
nonmetal_res=1 / 10,
min_lines=5,
expand_bounds=((0, 0), (0, 0), (10, 10)),
)
box = mesh.sim_box(include_pml=False)
sim.run(csx=False)
s11 = sim.s_param(1, 1)
s21 = sim.s_param(2, 1)
print("cutout width: {}".format(cutout_width))
print_table(
data=[sim.freq / 1e9, s11, s21],
col_names=["freq", "s11", "s21"],
prec=[4, 4, 4],
)
return np.sum(s11)
def sim_func(taper_angle: float):
"""
:param taper_angle: Linear taper angle in degrees.
"""
angle_rad = taper_angle * np.pi / 180
dy = np.abs(trace_width - microstrip_discontinuity_width) / 2
dx = dy / np.tan(angle_rad)
taper_middle = microstrip_discontinuity_length / 2 + dx / 2
taper_end = microstrip_discontinuity_length / 2 + dx
sim = Simulation(freq=freq, unit=unit, sim_dir=None)
pcb = PCB(
sim=sim,
pcb_prop=pcb_prop,
length=pcb_len,
width=pcb_width,
layers=range(3),
omit_copper=[0],
)
Microstrip(
pcb=pcb,
position=Coordinate2(0, 0),
length=microstrip_discontinuity_length,
width=microstrip_discontinuity_width,
propagation_axis=Axis("x"),
trace_layer=0,
gnd_layer=1,
)
Taper(
pcb=pcb,
position=Coordinate2(-taper_middle, 0),
pcb_layer=0,
width1=trace_width,
width2=microstrip_discontinuity_width,
length=dx,
)
Taper(
pcb=pcb,
position=Coordinate2(taper_middle, 0),
pcb_layer=0,
width1=microstrip_discontinuity_width,
width2=trace_width,
length=dx,
)
box = Box2(
Coordinate2(-pcb_len / 2, -trace_width / 2),
Coordinate2(-taper_end, trace_width / 2),
)
Microstrip(
pcb=pcb,
position=box.center(),
length=box.length(),
width=trace_width,
propagation_axis=Axis("x"),
trace_layer=0,
gnd_layer=1,
port_number=1,
excite=True,
feed_shift=0.35,
ref_impedance=50,
)
box = Box2(
Coordinate2(taper_end, -trace_width / 2),
Coordinate2(pcb_len / 2, trace_width / 2),
)
Microstrip(
pcb=pcb,
position=box.center(),
length=box.length(),
width=trace_width,
propagation_axis=Axis("x", direction=-1),
trace_layer=0,
gnd_layer=1,
port_number=2,
ref_impedance=50,
)
Mesh(
sim=sim,
metal_res=1 / 120,
nonmetal_res=1 / 40,
min_lines=5,
expand_bounds=((0, 0), (0, 0), (10, 40)),
)
# sim.run(csx=False)
sim.run()
return sim.s_param(1, 1)
#!/usr/bin/env python3
import os
import sys
import numpy as np
from pyems.simulation import Simulation
from pyems.structure import PCB, Microstrip, ViaWall
from pyems.coordinate import Coordinate2, Coordinate3, Box2, Box3, Axis
from pyems.pcb import common_pcbs
from pyems.mesh import Mesh
from pyems.utilities import print_table, mil_to_mm
from pyems.field_dump import FieldDump
freq = np.arange(0, 18e9, 1e7)
sim = Simulation(freq=freq, unit=1e-3)
pcb_prop = common_pcbs["oshpark4"]
pcb_len = 20
pcb_width = 5
trace_width = 0.34
gap = mil_to_mm(6)
via_gap = 0.4
pcb = PCB(
sim=sim,
pcb_prop=pcb_prop,
length=pcb_len,
width=pcb_width,
layers=range(3),
)
box = Box2(
Coordinate2(-pcb_len / 2, -trace_width / 2),
min_wavelength=wavelength(center_freq + delta_freq, unit),
# metal_res=1 / 40,
min_lines=2,
expand_bounds=[20, 20, 20, 20, 10, 40],
)
network._write_csx()
network.view()
sim_box = network.get_sim_box()
field_dump = FieldDump(csx=csx, box=sim_box)
sim = Simulation(
fdtd=fdtd,
csx=csx,
center_freq=center_freq,
half_bandwidth=delta_freq,
boundary_conditions=["PML_8", "PML_8", "PML_8", "PML_8", "PML_8", "PML_8"],
network=network,
field_dumps=[field_dump],
)
sim.simulate(nf2ff=True)
sim.view_field()
s11 = network.s_param(1, 1)
ports = network.get_ports()
freq = sim.get_freq()
with open(os.path.abspath("../.data/s11.dat"), "w+") as fout:
pretty_print(
np.concatenate(([freq / 1e9], [s11])),
from pyems.field_dump import FieldDump, DumpType
unit = 1e-3
ref_freq = 5.6e9
freq_res = 1e7
freq = np.arange(0, 18e9 + freq_res, freq_res)
pcb_prop = common_pcbs["oshpark4"]
pcb_len = 10
pcb_width = 5
trace_width = 0.38
z0_ref = 50
microstrip_discontinuity_width = 0.5
microstrip_discontinuity_length = 1
sim = Simulation(freq=freq, unit=unit, reference_frequency=5.6e9)
pcb = PCB(
sim=sim,
pcb_prop=pcb_prop,
length=pcb_len,
width=pcb_width,
layers=range(3),
omit_copper=[0],
)
Microstrip(
pcb=pcb,
position=Coordinate2(0, 0),
length=microstrip_discontinuity_length,
width=microstrip_discontinuity_width,
propagation_axis=Axis("x"),
def sim():
from pyems.simulation import Simulation
return Simulation(freq=np.linspace(4e9, 8e9, 501), unit=1e-3)
#!/usr/bin/env python
import numpy as np
from pyems.structure import PCB, Microstrip
from pyems.simulation import Simulation
from pyems.mesh import Mesh
from pyems.pcb import common_pcbs
from pyems.coordinate import Coordinate2, Axis, Box3, Coordinate3
from pyems.field_dump import FieldDump, DumpType
from pyems.utilities import print_table
freq = np.arange(0, 18e9, 1e7)
ref_freq = 5.6e9
unit = 1e-3
sim = Simulation(freq=freq, unit=unit, reference_frequency=ref_freq)
pcb_len = 10
pcb_width = 5
trace_width = 0.38
pcb_prop = common_pcbs["oshpark4"]
pcb = PCB(
sim=sim,
pcb_prop=pcb_prop,
length=pcb_len,
width=pcb_width,
layers=range(3),
omit_copper=[0],
)
Microstrip(
pcb=pcb,
import numpy as np
from pyems.simulation import Simulation
from pyems.structure import Coax
from pyems.coordinate import Coordinate3, Axis
from pyems.utilities import mil_to_mm, print_table
from pyems.calc import coax_core_diameter
from pyems.material import common_dielectrics
from pyems.field_dump import FieldDump, DumpType
from pyems.mesh import Mesh
from pyems.boundary import BoundaryConditions
freq = np.arange(4e9, 18e9, 1e7)
unit = 1e-3
sim = Simulation(
freq=freq,
unit=unit,
boundary_conditions=BoundaryConditions(
(("PML_8", "PML_8"), ("PML_8", "PML_8"), ("PML_8", "PML_8")), ),
)
dielectric = common_dielectrics["PTFE"]
length = 50
coax_rad = mil_to_mm(190 / 2) # RG-141
core_rad = (coax_core_diameter(
2 * coax_rad, dielectric.epsr_at_freq(sim.center_frequency())) / 2)
Coax(
sim=sim,
position=Coordinate3(0, 0, 0),
length=length,
radius=coax_rad,
core_radius=core_rad,
#!/usr/bin/env python3
import numpy as np
from pyems.pcb import common_pcbs
from pyems.structure import PCB, Microstrip
from pyems.coordinate import Box2, Coordinate2, Axis
from pyems.mesh import Mesh
from pyems.simulation import Simulation
from pyems.calc import sweep
from pyems.utilities import mil_to_mm, array_index, print_table
freq = np.linspace(4e9, 8e9, 501)
sim = Simulation(freq=freq, unit=1e-3)
pcb_prop = common_pcbs["oshpark4"]
pcb_len = 30
pcb_width = 10
z0_target = 50
width_dev_factor = 0.1
center_width = 0.34
gap = mil_to_mm(6)
via_gap = 0.4
num_points = 1
# num_points = 31
def sim_impedance(sim: Simulation):
"""
Get the characteristic impedance of a simulation.
"""
sim.run(csx=False)
ports = sim.ports