from __future__ import annotations
__all__ = ["doubly_clamped_beam"]
import gdsfactory as gf
from gdsfactory.component import Component
from gdsfactory.typings import LayerSpec
[docs]
@gf.cell_with_module_name
def doubly_clamped_beam(
beam_width: float = 1.0,
beam_length: float = 30.0,
anchor_width: float = 5.0,
anchor_length: float = 5.0,
layer: LayerSpec = "WG",
port_type: str = "electrical",
) -> Component:
"""Returns a doubly clamped beam fixed at both ends.
Two anchor pads connected by a thin beam, centered at the origin.
Args:
beam_width: width of the beam.
beam_length: length of the beam between the two anchors.
anchor_width: width (vertical) of each anchor pad.
anchor_length: length (horizontal) of each anchor pad.
layer: layer spec.
port_type: port type for electrical ports.
"""
c = Component()
total_length = 2 * anchor_length + beam_length
x_start = -total_length / 2
# Left anchor
c.add_polygon(
[
(x_start, -anchor_width / 2),
(x_start + anchor_length, -anchor_width / 2),
(x_start + anchor_length, anchor_width / 2),
(x_start, anchor_width / 2),
],
layer=layer,
)
# Central beam
beam_x0 = x_start + anchor_length
c.add_polygon(
[
(beam_x0, -beam_width / 2),
(beam_x0 + beam_length, -beam_width / 2),
(beam_x0 + beam_length, beam_width / 2),
(beam_x0, beam_width / 2),
],
layer=layer,
)
# Right anchor
right_x0 = beam_x0 + beam_length
c.add_polygon(
[
(right_x0, -anchor_width / 2),
(right_x0 + anchor_length, -anchor_width / 2),
(right_x0 + anchor_length, anchor_width / 2),
(right_x0, anchor_width / 2),
],
layer=layer,
)
# Port at left anchor outside edge
c.add_port(
"e1",
center=(x_start, 0),
width=anchor_width,
orientation=180,
layer=layer,
port_type=port_type,
)
# Port at right anchor outside edge
c.add_port(
"e2",
center=(right_x0 + anchor_length, 0),
width=anchor_width,
orientation=0,
layer=layer,
port_type=port_type,
)
return c
if __name__ == "__main__":
c = doubly_clamped_beam()
c.show()
