Draw a WiFi Antenna

Use <antenna /> with antennaShape for a generated PCB antenna. Use pcbPath instead when you have copper coordinates from a validated reference design or RF simulation. Define a one-pad footprint for its feed, place the feed with pcbX and pcbY, and enter the custom geometry in feed-local coordinates.

export default () => (
  <board width="32mm" height="18mm" minTraceWidth="0.3mm">
    <chip
      name="U1"
      manufacturerPartNumber="ESP32-C3"
      footprint="qfn32_w5mm_h5mm_p0.5mm_thermalpad3.7x3.7mm"
      pinLabels={{ pin1: "LNA_IN" }}
      pcbX={-12}
      schX={-8}
    />
    <capacitor
      name="C11"
      capacitance="1.5pF"
      footprint="0201"
      pcbX={-9}
      pcbY={2}
      schX={-4}
      schY={2}
    />
    <inductor
      name="L2"
      inductance="2.4nH"
      footprint="0201"
      pcbX={-7}
      schX={0}
    />
    <capacitor
      name="C12"
      capacitance="1.5pF"
      footprint="0201"
      pcbX={-5}
      pcbY={2}
      schX={4}
      schY={2}
    />
    <antenna
      name="ANT1"
      pcbX={-3}
      pcbY={-1}
      schX={8}
      footprint={
        <footprint>
          <smtpad
            shape="rect"
            width="1mm"
            height="1mm"
            portHints={["pin1"]}
          />
        </footprint>
      }
      pcbPath={[
        { x: 1, y: 0 },
        { x: 1, y: 5 },
        { x: 12, y: 5 },
        { x: 12, y: 3.5 },
        { x: 3, y: 3.5 },
        { x: 3, y: 2 },
        { x: 12, y: 2 },
        { x: 12, y: 0.5 },
        { x: 3, y: 0.5 },
        { x: 3, y: -1 },
        { x: 12, y: -1 },
      ]}
    />
    <trace from=".U1 > .LNA_IN" to=".L2 > .pin1" />
    <trace from=".C11 > .pin1" to=".L2 > .pin1" />
    <trace from=".C11 > .pin2" to="net.GND" />
    <trace from=".L2 > .pin2" to=".ANT1 > .feed" />
    <trace from=".C12 > .pin1" to=".L2 > .pin2" />
    <trace from=".C12 > .pin2" to="net.GND" />
  </board>
)

The antenna route begins at the footprint's pin1 pad automatically. Each coordinate object is measured in millimeters relative to that feed, so changing pcbX, pcbY, or pcbRotation moves the footprint and copper shape together. The separate <trace /> elements connect an ESP32-C3-style RF output and CLC matching network to the antenna's feed alias. This is only the RF fragment; the rest of the radio support circuit is omitted. Matching values are specific to the stackup, layout, and antenna, so tune them for the finished board.

Set minTraceWidth on the board or subcircuit to control the antenna copper width. The path can also use selector strings and via entries supported by <trace pcbPath>.

caution

This meander is an API example, not a tuned 2.4 GHz antenna. Copy dimensions, board stackup, feed impedance, and ground-clearance requirements from a validated antenna design. Use a <keepout /> to preserve the required copper-free region.