Use this electronics calculation for a first-pass component, converter, signal, motor, or sensor estimate when the stated operating conditions and units match the device data.

Effective beam solid angle (sr)

Required number input.

Compute ideal directivity index from a measured or modeled effective acoustic beam solid angle. The tool evaluates the supplied inputs together and returns the named outputs below; it does not infer omitted operating conditions or change the units shown.^[1]

Directivity index (dB)

The resulting directivity index returned as a number.

• Microphone sensitivity, SPL limit, directivity, and phantom-power calculations depend on frequency, load, reference pressure, weighting, polar pattern, preamplifier noise, distortion criterion, supply circuit, and acoustic environment.
• Use finite inputs in the displayed units and preserve more precision than the final presentation requires. Independently verify safety-critical, financial, compliance, or production decisions.

Check the result against the current datasheet and worst-case operating corners, then verify the circuit or measurement with simulation and bench testing where failure matters.

• Laser Divergence Angle

  Far-field half-angle divergence of an ideal diffraction-limited Gaussian beam from wavelength and waist radius.

• Antenna Polarization Loss

  Ideal linear-polarization mismatch loss from the relative angle between transmit and receive polarization axes.

• Antenna Rad Efficiency 2

  Infer antenna radiation efficiency in percent from measured gain and directivity via efficiencyPercent = 10^((gainDbi - directivityDbi) / 10) * 100.