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.

Main Peak Watts (W)

Required number input.

Sidelobe Peak Watts (W)

Required number input.

Sidelobe level relative to the main-lobe peak from linear same-reference power measurements. 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]

Sidelobe Dbc (dBc)

The resulting sidelobe dbc returned as a number.

• Antenna formulas assume stated frequency, impedance match, polarization, efficiency, aperture, and propagation geometry. Nearby objects, ground, feed loss, multipath, regulatory averaging, near-field conditions, and pattern variation can make free-space or ideal-aperture results inaccurate.
• 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.

• Antenna Front To Back Ratio

  Directional front-to-back radiation ratio from same-distance power measurements in the two directions.

• Antenna Half Power Beamwidth

  Angular separation of the two −3 dB pattern crossings around one antenna main lobe.

• Gain dB To Linear

  Convert an antenna power gain in decibels to a linear power ratio.