def test_dielectric(er, cond, f):
thk = 0.5
total_time = max(1.0 / f, 40e-9)
dx = 0.005
grid = fdtd.Grid1D(dx, 2.0)
print(grid)
grid.set_material(1.0, 1.0 + thk, er=er, cond=cond)
amplitude = 1.0
source = fdtd.Sinusoid(0.1, 'Sine', amplitude, f)
grid.add_source(source)
transmission_probe = fdtd.Probe(1.9)
grid.add_probe(transmission_probe)
grid.solve(total_time)
result = transmission_probe.data.max()
air = shield.Material()
dielectric = shield.Material(er=er, cond=cond, thickness=thk)
expected = 1 / shield.shielding_effectiveness(f, air, dielectric)
assert result == approx(expected, rel=0.01)
def test_absorption(ur, cond_r, result):
f = 1e6
t = 3.175e-3
shld = ps.Material(ur=ur, cond=(cond_r * COND_CU), thickness=t)
se_db = ps.db(ps.absorption_loss(f, shld))
assert se_db == approx(result, rel=0.01)
def test_reflection(ur, cond_r, result):
f = 1e6
air = ps.Material()
shld = ps.Material(ur=ur, cond=(cond_r * COND_CU))
se_db = ps.db(ps.reflection_loss(f, air, shld))
assert se_db == approx(result, rel=0.01)
def test_skin_depth(ur, cond_r, result):
f = 1e6
shld = ps.Material(ur=ur, cond=(cond_r * COND_CU))
assert shld.skin_depth(f) == approx(result, rel=0.01)
def test_impedance(er, ur, cond, f, result):
mat = ps.Material(er=er, ur=ur, cond=cond)
assert mat.impedance(f) == approx(result)