# This code is part of KQCircuits
# Copyright (C) 2021 IQM Finland Oy
#
# This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public
# License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later
# version.
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# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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# https://www.gnu.org/licenses/gpl-3.0.html.
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# The software distribution should follow IQM trademark policy for open-source software
# (meetiqm.com/developers/osstmpolicy). IQM welcomes contributions to the code. Please see our contribution agreements
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import math
from kqcircuits.elements.element import Element
from kqcircuits.pya_resolver import pya
from kqcircuits.util.parameters import Param, pdt, add_parameters_from
from kqcircuits.elements.finger_capacitor_square import FingerCapacitorSquare
from kqcircuits.elements.waveguide_coplanar_straight import WaveguideCoplanarStraight
[docs]@add_parameters_from(WaveguideCoplanarStraight, "add_metal")
@add_parameters_from(FingerCapacitorSquare, a2=Element.a*2, b2=Element.b*2)
class WaveguideCoplanarTaper(Element):
"""The PCell declaration of a taper segment of a coplanar waveguide.
.. MARKERS_FOR_PNG 0,0,31.2,0 0,5,0,-5 31.2,-10,31.2,10
"""
taper_length = Param(pdt.TypeDouble, "Taper length", 10 * math.pi, unit="μm")
m2 = Param(pdt.TypeDouble, "Margin of right waveguide protection layer", 5 * 2, unit="μm")
[docs] def build(self):
#
# gap 1
pts = [
pya.DPoint(0, self.a / 2 + 0),
pya.DPoint(self.taper_length, self.a2 / 2 + 0),
pya.DPoint(self.taper_length, self.a2 / 2 + self.b2),
pya.DPoint(0, self.a / 2 + self.b)
]
shape = pya.DPolygon(pts)
self.cell.shapes(self.get_layer("base_metal_gap_wo_grid")).insert(shape)
# gap 2
pts = [
pya.DPoint(0, -self.a / 2 + 0),
pya.DPoint(self.taper_length, -self.a2 / 2 + 0),
pya.DPoint(self.taper_length, -self.a2 / 2 - self.b2),
pya.DPoint(0, -self.a / 2 - self.b)
]
shape = pya.DPolygon(pts)
self.cell.shapes(self.get_layer("base_metal_gap_wo_grid")).insert(shape)
# Protection layer
pts = [
pya.DPoint(0, -self.a / 2 - self.b - self.margin),
pya.DPoint(self.taper_length, -self.a2 / 2 - self.b2 - self.m2),
pya.DPoint(self.taper_length, self.a2 / 2 + self.b2 + self.m2),
pya.DPoint(0, self.a / 2 + self.b + self.margin)
]
self.add_protection(pya.DPolygon(pts))
# Waveguide layer
pts = [
pya.DPoint(0, self.a / 2),
pya.DPoint(self.taper_length, self.a2 / 2),
pya.DPoint(self.taper_length, -self.a2 / 2),
pya.DPoint(0, -self.a / 2)
]
shape = pya.DPolygon(pts)
self.cell.shapes(self.get_layer("waveguide_path")).insert(shape)
if self.add_metal:
self.cell.shapes(self.get_layer("base_metal_addition")).insert(shape)
pts = [
pya.DPoint(0, 0),
pya.DPoint(self.taper_length, 0),
]
shape = pya.DPath(pts, min(self.a, self.a2))
self.cell.shapes(self.get_layer("waveguide_path")).insert(shape)
if self.add_metal:
self.cell.shapes(self.get_layer("base_metal_addition")).insert(shape)
# refpoints for connecting to waveguides
self.add_port("a", pya.DPoint(0, 0), pya.DVector(-1, 0))
self.add_port("b", pya.DPoint(self.taper_length, 0), pya.DVector(1, 0))